SAM4S Series Atmel | SMART ARM-based Flash MCU DATASHEET Description The Atmel (R) | SMART SAM4S series is a member of a family of Flash microcontrollers based on the high-performance 32-bit ARM(R) Cortex(R)-M4 RISC processor. It operates at a maximum speed of 120 MHz and features up to 2048 Kbytes of Flash, with optional dual-bank implementation and cache memory, and up to 160 Kbytes of SRAM. The peripheral set includes a full-speed U S B D e v ic e p o r t w i t h e m b e d d e d t r a n s c e i v e r , a h i g h - s p e e d M C I f o r SDIO/SD/MMC, an External Bus Interface featuring a Static Memory Controller to connect to SRAM, PSRAM, NOR Flash, LCD Module and NAND Flash, 2 USARTs, 2 UARTs, 2 TWIs, 3 SPIs, an I2S, as well as a PWM timer, two 3channel general-purpose 16-bit timers (with stepper motor and quadrature decoder logic support), an RTC, a 12-bit ADC, a 12-bit DAC and an analog comparator. The SAM4S series is ready for capacitive touch, offering native support for the Atmel QTouch(R) library for easy implementation of buttons, wheels and sliders. The Atmel | SMART SAM4S devices have three software-selectable low-power modes: Sleep, Wait and Backup. In Sleep mode, the processor is stopped while all other functions can be kept running. In Wait mode, all clocks and functions are stopped but some peripherals can be configured to wake up the system based on predefined conditions. In Backup mode, only the low-power RTC and wakeup logic are running. The real-time event management allows peripherals to receive, react to and send events in Active and Sleep modes without processor intervention. The SAM4S device is a medium-range general-purpose microcontroller with the best ratio in terms of reduced power consumption, processing power and peripheral set. This enables the SAM4S to sustain a wide range of applications that includes consumer, industrial control, and PC peripherals. SAM4S devices operate from 1.62V to 3.6V. The SAM4S series is pin-to-pin compatible with the SAM3N, SAM3S series (48-, 64- and 100-pin versions), SAM4N and SAM7S legacy series (64-pin versions). Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Features 2 Core ARM Cortex-M4 with 2 Kbytes of cache running at up to 120 MHz Memory Protection Unit (MPU) DSP Instruction Set Thumb(R)-2 instruction set Pin-to-pin compatible with SAM3N, SAM3S, SAM4N and SAM7S legacy products (64-pin version) Memories Up to 2048 Kbytes embedded Flash with optional dual-bank and cache memory, ECC, Security Bit and Lock Bits Up to 160 Kbytes embedded SRAM 16 Kbytes ROM with embedded boot loader routines (UART, USB) and IAP routines 8-bit Static Memory Controller (SMC): SRAM, PSRAM, NOR and NAND Flash support System Embedded voltage regulator for single supply operation Power-on-Reset (POR), Brown-out Detector (BOD) and Watchdog for safe operation Quartz or ceramic resonator oscillators: 3 to 20 MHz main power with failure detection and optional low-power 32.768 kHz for RTC or device clock RTC with Gregorian and Persian calendar mode, waveform generation in low-power modes RTC counter calibration circuitry compensates for 32.768 kHz crystal frequency inaccuracy High-precision 8/12 MHz factory-trimmed internal RC oscillator with 4 MHz default frequency for device startup, in-application trimming access for frequency adjustment Slow clock internal RC oscillator as permanent low-power mode device clock Two PLLs up to 240 MHz for device clock and for USB Temperature sensor Low-power tamper detection on two inputs, anti-tampering by immediate clear of general-purpose backup registers (GPBR) Up to 22 Peripheral DMA (PDC) channels Low-power Modes Sleep, Wait and Backup modes; consumption down to 1 A in Backup mode Peripherals USB 2.0 Device: 12 Mbps, 2668 byte FIFO, up to 8 bidirectional Endpoints, on-chip transceiver Up to two USARTs with ISO7816, IrDA(R), RS-485, SPI, Manchester and Modem Mode Two 2-wire UARTs Up to two 2-Wire Interface modules (I2C-compatible), one SPI, one Serial Synchronous Controller (I2S), one high-speed Multimedia Card Interface (SDIO/SD Card/MMC) Two 3-channel 16-bit Timer Counters with capture, waveform, compare and PWM mode, Quadrature decoder logic and 2-bit Gray up/down counter for stepper motor 4-channel 16-bit PWM with complementary output, fault input, 12-bit dead time generator counter for motor control 32-bit Real-time Timer and RTC with calendar, alarm and 32 kHz trimming features 256-bit General Purpose Backup Registers (GPBR) Up to 16-channel, 1Msps ADC with differential input mode and programmable gain stage and auto calibration One 2-channel 12-bit 1Msps DAC One Analog Comparator with flexible input selection, selectable input hysteresis 32-bit Cyclic Redundancy Check Calculation Unit (CRCCU) for data integrity check of off-/on-chip memories Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 I/O Up to 79 I/O lines with external interrupt capability (edge or level sensitivity), debouncing, glitch filtering and ondie series resistor termination Three 32-bit Parallel Input/Output Controllers, Peripheral DMA-assisted Parallel Capture mode Packages 100-lead packages LQFP - 14 x 14 mm, pitch 0.5 mm TFBGA - 9 x 9 mm, pitch 0.8 mm VFBGA - 7 x 7 mm, pitch 0.65 mm 64-lead packages LQFP - 10 x 10 mm, pitch 0.5 mm QFN - 9 x 9 mm, pitch 0.5 mm WLCSP - 4.42 x 4.72 mm, pitch 0.4 mm (SAM4SD32/SAM4SD16) WLCSP - 4.42 x 3.42 mm, pitch 0.4 mm (SAM4S16/S8) WLCSP - 3.32 x 3.32 mm, pitch 0.4 mm (SAM4S4/S2) 48-lead packages LQFP - 7 x 7 mm, pitch 0.5 mm QFN - 7 x 7 mm, pitch 0.5 mm SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 3 Safety Features Highlight 4 Flash Built-in ECC (hamming), single error correction Security bit and lock bits SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1. Configuration Summary The SAM4S series devices differ in memory size, package and features. Table 1-1 and Table 1-2 summarize the configurations of the device family. Table 1-1. Configuration Summary for SAM4SD32/SD16/SA16/S16 Devices Feature SAM4SD32C Flash SAM4SD32B SAM4SD16C SAM4SD16B 2 x 1024 Kbytes 2 x 1024 Kbytes 2 x 512 Kbytes 2 x 512 Kbytes SRAM SAM4SA16C SAM4SA16B SAM4S16C SAM4S16B 1024 Kbytes 1024 Kbytes 1024 Kbytes 1024 Kbytes 160 Kbytes 160 Kbytes 160 Kbytes 160 Kbytes 160 Kbytes 160 Kbytes 128 Kbytes 128 Kbytes HCACHE 2 Kbytes 2 Kbytes 2 Kbytes 2 Kbytes 2 Kbytes 2 Kbytes - - Package LQFP100 TFBGA100 VFBGA100 LQFP64 QFN64 WLCSP64 LQFP100 TFBGA100 VFBGA100 LQFP64 QFN64 WLCSP64 LQFP100 TFBGA100 VFBGA100 LQFP64 QFN64 LQFP100 TFBGA100 VFBGA100 LQFP64 QFN64 WLCSP64 79 47 79 47 79 47 79 47 8-bit data, 4 chip selects, 24-bit address - 8-bit data, 4 chip selects, 24-bit address - 8-bit data, 4 chip selects, 24-bit address - 8-bit data, 4 chip selects, 24-bit address - 12-bit ADC 16 ch.(1) 11 ch.(1) 16 ch.(1) 11 ch.(1) 16 ch.(1) 11 ch.(1) 16 ch.(1) 11 ch.(1) 12-bit DAC 2 ch. 2 ch. 2 ch. 2 ch. 2 ch. 2 ch. 2 ch. 2 ch. Timer Counter Channels 6 6(2) 6 6(2) 6 6(2) 6 6(2) PDC Channels 22 22 22 22 22 22 22 22 Number of PIOs External Bus Interface USART/UART 2/2 HSMCI (3) 1 port, 4 bits Table 1-2. (3) 2/2 1 port, 4 bits 2/2 (3) 1 port, 4 bits 2/2 (3) 1 port, 4 bits 2/2 (3) 2/2 (3) 2/2 (3) 1 port, 4 bits 1 port, 4 bits 1 port, 4 bits 2/2(3) 1 port, 4 bits Configuration Summary for SAM4S8/S4/S2 Devices Feature SAM4S8C SAM4S8B SAM4S4C SAM4S4B SAM4S4A SAM4S2C SAM4S2B SAM4S2A Flash 512 Kbytes 512 Kbytes 256 Kbytes 256 Kbytes 256 Kbytes 128 Kbytes 128 Kbytes 128 Kbytes SRAM 128 Kbytes 128 Kbytes 64 Kbytes 64 Kbytes 64 Kbytes 64 Kbytes 64 Kbytes 64 Kbytes HCACHE - - - - - - - - Package LQFP100 TFBGA100 VFBGA100 LQFP64 QFN64 WLCSP64 LQFP100 TFBGA100 VFBGA100 LQFP64 QFN64 WLCSP64 LQFP48 QFN48 LQFP100 TFBGA100 VFBGA100 LQFP64 QFN64 WLCSP64 LQFP48 QFN48 79 47 79 47 34 79 47 34 8-bit data, 4 chip selects, 24-bit address - 8-bit data, 4 chip selects, 24-bit address - - 8-bit data, 4 chip selects, 24-bit address - - 12-bit ADC 16 ch.(1) 11 ch.(1) 16 ch.(1) 11 ch.(1) 8 ch. 16 ch.(1) 16 ch.(1) 8 ch 12-bit DAC 2 ch. 2 ch. 2 ch. 2 ch. - 2 ch. 2 ch. - Timer Counter Channels 6 6(2) 6 6(2) 6(2) 6 6(2) 6(2) PDC Channels 22 22 22 22 22 22 22 22 Number of PIOs External Bus Interface USART/UART HSMCI Notes: 2/2 (3) 1 port, 4 bits 2/2 (3) 1 port, 4 bits 2/2 (3) 1 port, 4 bits 2/2 (3) 1 port, 4 bits 2/1 - 2/2 (3) 1 port, 4 bits 2/2 (3) 1 port, 4 bits 2/1 - 1. One channel is reserved for internal temperature sensor. 2. Three TC channels are reserved for internal use. 3. Full modem support on USART1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 5 Block Diagram SAM4SD32/SD16/SA16 100-pin Version Block Diagram TD VD TST O D D IO U T I TD O TM S TC /SW K/ D SW IO JT C LK AG SE L Figure 2-1. VD 2. Voltage Regulator PCK[2:0] PLLA PLLB Power Management Controller JTAG and Serial Wire RC Osc 4/8/12 MHz XIN In-Circuit Emulator Cortex-M4 Processor fMAX 120 MHz 3-20 MHz Oscillator XOUT ERASE Supply Controller WKUP[15:0] Backup XIN32 XOUT32 DSP MPU 32K Cryst Osc I S 32K typ. RC Osc VDDIO VDDCORE VDDPLL Power-on Reset 256-bit GPBR RTCOUT0 RTCOUT1 Real-time Clock Real-time Timer Watchdog Timer Supply Monitor Flash Unique Identifier D CMCC (2 Kbyte Cache) M Reset Controller NRST 24-bit SysTick Counter NVIC Tamper Detection User Signature Flash M S 2*1024/2*512/1024 Kbytes 4-layer AHB Bus Matrix fMAX 120 MHz S 160 Kbytes S M SRAM ROM S S 16 Kbytes PIOA/PIOB/PIOC AHB/APB Bridge System Controller External Bus Interface PDC NAND Flash Logic TWI0 TWCK1 TWD1 TWI1 URXD0 UTXD0 UART0 URXD1 UTXD1 UART1 PDC Static Memory Controller PDC PDC 2668 bytes FIFO USB 2.0 Full-speed PDC PDC High-speed SCK0 TXD0 RXD0 RTS0 CTS0 PDC MCI USART0 PDC SPI SCK1 TXD1 RXD1 RTS1 CTS1 DTR1 DSR1 DCD1 RI1 PDC PDC USART1 PIODC[7:0] PIODCCLK PIODCEN[2:1] SSC DDP DDM MCCK MCCDA MCDA[3:0] MISO MOSI SPCK NPCS[3:0] TD RD TK RK TF RF CRCCU PDC PIO Timer Counter 0 TC[0..2] PDC AD[14:0] ADTRG TCLK[2:0] TIOA[2:0] TIOB[2:0] ADC PDC DAC[1:0] DATRG DAC ADC DAC Temp. Sensor ADVREF Analog Comparator SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Event System Timer Counter 1 Temp Sensor ADVREF 6 Transceiver TWCK0 TWD0 D[7:0] A[23:0] A21/NANDALE A22/NANDCLE NANDOE NANDWE NWAIT NCS[3:0] NRD NWE TC[3..5] PDC PWM TCLK[5:3] TIOA[5:3] TIOB[5:3] PWMH[3:0] PWML[3:0] PWMFI0 SAM4SD32/SD16/SA16 64-pin Version Block Diagram TST U O D VD VD D IO T TD I TD O TM S TC /SW K/ D SW IO JT C LK AG SE L Figure 2-2. Voltage Regulator PCK[2:0] PLLA PLLB Power Management Controller JTAG and Serial Wire RC Osc 4/8/12 MHz XIN In-Circuit Emulator Cortex-M4 Processor fMAX 120 MHz 3-20 MHz Oscillator XOUT ERASE Supply Controller WKUP[15:0] Backup XIN32 XOUT32 DSP Tamper Detection MPU 32K Cryst Osc I S 32K typ. RC Osc VDDIO VDDCORE VDDPLL Power-on Reset 256-bit GPBR RTCOUT0 RTCOUT1 Real-time Clock Real-time Timer Watchdog Timer Supply Monitor Flash Unique Identifier D CMCC (2 Kbyte Cache) M Reset Controller NRST 24-bit SysTick Counter NVIC User Signature Flash M S 2*1024/2*512/1024 Kbytes 4-layer AHB Bus Matrix fMAX 120 MHz S 160 Kbytes S M AHB/APB Bridge PDC SRAM ROM S S 16 Kbytes System Controller TWCK0 TWD0 TWI0 TWCK1 TWD1 TWI1 URXD0 UTXD0 UART0 PDC 2668 bytes FIFO USB 2.0 Full-speed PDC UART1 SCK0 TXD0 RXD0 RTS0 CTS0 MCI PDC PDC PDC USART0 SCK1 TXD1 RXD1 RTS1 CTS1 DTR1 DSR1 DCD1 RI1 DDP DDM PDC PDC High-speed URXD1 UTXD1 Transceiver PIOA/PIOB/PIOC SPI MCCK MCCDA MCDA[3:0] MISO MOSI SPCK NPCS[3:0] PDC PDC SSC USART1 TD RD TK RK TF RF CRCCU PIODC[7:0] PIODCCLK PIODCEN[2:1] PDC PIO Timer Counter 0 TC[0..2] ADC Temp Sensor ADVREF PDC DAC[1:0] DATRG DAC Event System PDC AD[9:0] ADTRG Timer Counter 1 TC[3..5] PDC PWM ADC DAC Temp Sensor ADVREF TCLK[2:0] TIOA[2:0] TIOB[2:0] PWMH[3:0] PWML[3:0] PWMFI0 Analog Comparator SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 7 PLLA PLLB Power Management Controller U JTAG and Serial Wire RC Osc 4/8/12 MHz XIN In-Circuit Emulator Cortex-M4 Processor fMAX 120 MHz 3-20 MHz Oscillator XOUT ERASE Supply Controller WKUP[15:0] Backup XIN32 XOUT32 DSP 24-bit SysTick Counter NVIC Tamper Detection MPU Flash Unique Identifier 32K Cryst Osc 32K typ. RC Osc RTCOUT0 RTCOUT1 D Voltage Regulator PCK[2:0] VDDIO VDDCORE VDDPLL O IO D TST VD VD TD TD T O TM S TC /SW K/ D SW IO JT C LK AG SE L SAM4S16/S8 100-pin Version Block Diagram I Figure 2-3. Power-on Reset 256-bit GPBR Real-time Clock Real-time Timer Watchdog Timer I/D S M M 4-layer AHB Bus Matrix fMAX 120 MHz Reset Controller NRST Supply Monitor User Signature S M Flash S 1024/512 Kbytes S 128 Kbytes SRAM ROM S S 16 Kbytes PIOA/PIOB/PIOC AHB/APB Bridge System Controller External Bus Interface PDC NAND Flash Logic TWI0 TWCK1 TWD1 TWI1 URXD0 UTXD0 UART0 URXD1 UTXD1 UART1 PDC Static Memory Controller PDC PDC 2668 bytes FIFO USB 2.0 Full-speed PDC PDC High-speed SCK0 TXD0 RXD0 RTS0 CTS0 PDC MCI USART0 PDC SPI SCK1 TXD1 RXD1 RTS1 CTS1 DTR1 DSR1 DCD1 RI1 PDC PDC USART1 PIODC[7:0] PIODCCLK PIODCEN[2:1] SSC DDP DDM MCCK MCCDA MCDA[3:0] MISO MOSI SPCK NPCS[3:0] TD RD TK RK TF RF CRCCU PDC PIO Timer Counter 0 TC[0..2] PDC AD[14:0] ADTRG TCLK[2:0] TIOA[2:0] TIOB[2:0] ADC PDC DAC[1:0] DATRG DAC ADC DAC Temp Sensor ADVREF Analog Comparator SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Event System Timer Counter 1 Temp Sensor ADVREF 8 Transceiver TWCK0 TWD0 D[7:0] A[23:0] A21/NANDALE A22/NANDCLE NANDOE NANDWE NWAIT NCS[3:0] NRD NWE TC[3..5] PDC PWM TCLK[5:3] TIOA[5:3] TIOB[5:3] PWMH[3:0] PWML[3:0] PWMFI0 SAM4S16/S8 64-pin Version Block Diagram TST PLLA Power Management Controller PLLB U O JTAG and Serial Wire RC Osc 4/8/12 MHz XIN In-Circuit Emulator Cortex-M4 Processor fMAX 120 MHz 3-20 MHz Oscillator XOUT ERASE Supply Controller WKUP[15:0] Backup DSP 24-bit SysTick Counter NVIC Tamper Detection MPU 32K Cryst Osc XIN32 XOUT32 Flash Unique Identifier 32K typ. RC Osc RTCOUT0 RTCOUT1 D Voltage Regulator PCK[2:0] VDDIO VDDCORE VDDPLL VD VD D IO T TD I TD O TM S TC /SW K/ D SW IO JT C LK AG SE L Figure 2-4. Power-on Reset 256-bit GPBR Real-time Clock Real-time Timer Watchdog Timer I/D S M M 4-layer AHB Bus Matrix fMAX 120 MHz Reset Controller NRST Supply Monitor User Signature S M AHB/APB Bridge PDC Flash S 1024/512 Kbytes S 128 Kbytes SRAM ROM S S 16 Kbytes System Controller TWCK0 TWD0 TWI0 TWCK1 TWD1 TWI1 URXD0 UTXD0 UART0 PDC 2668 bytes FIFO PDC USB 2.0 Full-speed UART1 SCK0 TXD0 RXD0 RTS0 CTS0 MCI PDC PDC PDC USART0 SCK1 TXD1 RXD1 RTS1 CTS1 DTR1 DSR1 DCD1 RI1 DDP DDM PDC PDC High-speed URXD1 UTXD1 Transceiver PIOA/PIOB SPI MCCK MCCDA MCDA[3:0] MISO MOSI SPCK NPCS[3:0] PDC PDC SSC USART1 PIODC[7:0] PIODCCLK PIODCEN[2:1] CRCCU PDC PIO Timer Counter 0 TC[0..2] ADC Temp Sensor ADVREF PDC DAC[1:0] DATRG DAC ADC DAC Temp Sensor ADVREF Event System PDC AD[9:0] ADTRG TD RD TK RK TF RF TCLK[2:0] TIOA[2:0] TIOB[2:0] Timer Counter 1 TC[3..5] PDC PWM PWMH[3:0] PWML[3:0] PWMFI0 Analog Comparator SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 9 SAM4S4/S2 100-pin Version Block Diagram TST PLLA PLLB Power Management Controller U O JTAG and Serial Wire RC Osc 4/8/12 MHz XIN In-Circuit Emulator Cortex-M4 Processor fMAX 120 MHz 3-20 MHz Oscillator XOUT ERASE Supply Controller WKUP[15:0] Backup XIN32 XOUT32 DSP 24-bit SysTick Counter NVIC Tamper Detection MPU Flash Unique Identifier 32K Cryst Osc 32K typ. RC Osc RTCOUT0 RTCOUT1 D Voltage Regulator PCK[2:0] VDDIO VDDCORE VDDPLL VD VD D IO T TD I TD O TM S TC /SW K/ D SW IO JT C LK AG SE L Figure 2-5. Power-on Reset 256-bit GPBR Real-time Clock Real-time Timer Watchdog Timer I/D S M M 4-layer AHB Bus Matrix fMAX 120 MHz Reset Controller NRST Supply Monitor User Signature S M Flash S 256/128 Kbytes S 64 Kbytes SRAM ROM S S 16 Kbytes PIOA/PIOB/PIOC AHB/APB Bridge System Controller External Bus Interface PDC NAND Flash Logic TWI0 TWCK1 TWD1 TWI1 URXD0 UTXD0 UART0 URXD1 UTXD1 UART1 PDC Static Memory Controller PDC PDC 2668 bytes FIFO USB 2.0 Full-speed PDC PDC High-speed SCK0 TXD0 RXD0 RTS0 CTS0 PDC MCI USART0 PDC SPI SCK1 TXD1 RXD1 RTS1 CTS1 DTR1 DSR1 DCD1 RI1 PDC PDC USART1 PIODC[7:0] PIODCCLK PIODCEN[2:1] SSC DDP DDM MCCK MCCDA MCDA[3:0] MISO MOSI SPCK NPCS[3:0] TD RD TK RK TF RF CRCCU PDC PIO Timer Counter 0 TC[0..2] PDC AD[14:0] ADTRG TCLK[2:0] TIOA[2:0] TIOB[2:0] ADC PDC DAC[1:0] DATRG DAC ADC DAC Temp Sensor ADVREF Analog Comparator SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Event System Timer Counter 1 Temp Sensor ADVREF 10 Transceiver TWCK0 TWD0 D[7:0] A[23:0] A21/NANDALE A22/NANDCLE NANDOE NANDWE NWAIT NCS[3:0] NRD NWE TC[3..5] PDC PWM TCLK[5:3] TIOA[5:3] TIOB[5:3] PWMH[3:0] PWML[3:0] PWMFI0 SAM4S4/S2 64-pin Version Block Diagram TST D VD VD D O IO U T TD I TD O TM S TC /SW K/ D SW IO JT C LK AG SE L Figure 2-6. Voltage Regulator PCK[2:0] PLLA Power Management Controller PLLB JTAG and Serial Wire RC Osc 4/8/12 MHz XIN In-Circuit Emulator Cortex-M4 Processor fMAX 120 MHz 3-20 MHz Oscillator XOUT ERASE WKUP[15:0] Supply Controller Backup XIN32 XOUT32 DSP 24-bit SysTick Counter NVIC Tamper Detection MPU Flash Unique Identifier 32K Cryst Osc 32K typ. RC Osc VDDIO VDDCORE VDDPLL Power-on Reset 256-bit GPBR RTCOUT0 RTCOUT1 Real-time Clock Real-time Timer Watchdog Timer I/D S M M 4-layer AHB Bus Matrix fMAX 120 MHz Reset Controller NRST Supply Monitor User Signature S M AHB/APB Bridge PDC Flash S 256/128 Kbytes S 64 Kbytes SRAM ROM S 16 Kbytes System Controller TWCK0 TWD0 TWI0 TWCK1 TWD1 TWI1 URXD0 UTXD0 UART0 PDC 2668 bytes FIFO PDC USB 2.0 Full-speed UART1 SCK0 TXD0 RXD0 RTS0 CTS0 MCI PDC PDC PDC USART0 SCK1 TXD1 RXD1 RTS1 CTS1 DTR1 DSR1 DCD1 RI1 DDP DDM PDC PDC High-speed URXD1 UTXD1 Transceiver PIOA/PIOB SPI MCCK MCCDA MCDA[3:0] MISO MOSI SPCK NPCS[3:0] PDC PDC SSC USART1 PIODC[7:0] PIODCCLK PIODCEN[2:1] CRCCU PDC PIO Timer Counter 0 TC[0..2] PDC AD[9:0] ADTRG ADC PDC DAC Event System Temp Sensor ADC DAC Temp Sensor ADVREF TCLK[2:0] TIOA[2:0] TIOB[2:0] Timer Counter 1 ADVREF DAC[1:0] DATRG TD RD TK RK TF RF TC[3..5] PDC PWM PWMH[3:0] PWML[3:0] PWMFI0 Analog Comparator SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 11 SAM4S4/S2 48-pin Version Block Diagram TST PLLA Power Management Controller PLLB U O JTAG and Serial Wire RC Osc 4/8/12 MHz XIN In-Circuit Emulator Cortex-M4 Processor fMAX 120 MHz 3-20 MHz Oscillator XOUT ERASE WKUP[15:0] Supply Controller Backup XIN32 XOUT32 DSP 24-bit SysTick Counter NVIC Tamper Detection MPU Flash Unique Identifier 32K Cryst Osc 32K typ. RC Osc RTCOUT0 RTCOUT1 D Voltage Regulator PCK[2:0] VDDIO VDDCORE VDDPLL VD VD D IO T TD I TD O TM S TC /SW K/ D SW IO JT C LK AG SE L Figure 2-7. Power-on Reset 256-bit GPBR Real-time Clock Real-time Timer Watchdog Timer I/D S M M 4-layer AHB Bus Matrix fMAX 120 MHz Reset Controller NRST Supply Monitor User Signature S M AHB/APB Bridge PDC Flash S 256/128 Kbytes S 64 Kbytes SRAM ROM S 16 Kbytes System Controller TWCK0 TWD0 TWI0 TWCK1 TWD1 TWI1 URXD0 UTXD0 UART0 2668 bytes FIFO PDC USB 2.0 Full-speed PDC PDC SPI PDC PDC URXD1 UTXD1 UART1 SCK0 TXD0 RXD0 RTS0 CTS0 USART0 AD[7:0] ADTRG ADC SSC PDC Timer Counter 0 PDC Temp Sensor ADC DAC Temp Sensor ADVREF Analog Comparator SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Event System TC[0..2] ADVREF 12 PDC Transceiver PIOA/PIOB DDP DDM MISO MOSI SPCK NPCS[3:0] TD RD TK RK TF RF TCLK[2:0] TIOA[2:0] TIOB[2:0] Timer Counter 1 TC[3..5] PDC PWM PWMH[3:0] PWML[3:0] PWMFI0 3. Signal Description Table 3-1 gives details on signal names classified by peripheral. Table 3-1. Signal Description List Signal Name Function Type Active Level Voltage Reference Comments Power Supplies VDDIO Peripherals I/O Lines and USB transceiver Power Supply Power - - 1.62V to 3.6V VDDIN Voltage Regulator Input, ADC, DAC and Analog Comparator Power Supply Power - - 1.62V to 3.6V(4) VDDOUT Voltage Regulator Output Power - - 1.2V output VDDPLL Oscillator and PLL Power Supply Power - - 1.08V to 1.32V VDDCORE Power the core, the embedded memories and the peripherals Power - - 1.08V to 1.32V GND Ground Ground - - - Clocks, Oscillators and PLLs XIN Main Oscillator Input XOUT Main Oscillator Output XIN32 Slow Clock Oscillator Input XOUT32 Slow Clock Oscillator Output Input - Reset State: Output - - PIO Input Input - - Internal Pull-up disabled Output - - Schmitt Trigger enabled(1) VDDIO Reset State: PCK0-PCK2 Programmable Clock Output Output - PIO Input - - Internal Pull-up enabled - Schmitt Trigger enabled(1) Real Time Clock - RTC RTCOUT0 Programmable RTC waveform output Output Reset State: - VDDIO RTCOUT1 Programmable RTC waveform output Output - - PIO Input - Internal Pull-up enabled - Schmitt Trigger enabled(1) Serial Wire/JTAG Debug Port - SWJ-DP TCK/SWCLK Test Clock/Serial Wire Clock Input - TDI Test Data In Input - TDO/TRACESWO Test Data Out / Trace Asynchronous Data Out Output - TMS/SWDIO Test Mode Select /Serial Wire Input/Output JTAGSEL JTAG Selection Reset State: - SWJ-DP Mode VDDIO Input / I/O - Input High - Internal pull-up disabled(5) - Schmitt Trigger enabled(1) Permanent Internal pull-down SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 13 Table 3-1. Signal Description List (Continued) Signal Name Function Type Active Level Voltage Reference Comments Flash Memory Reset State: Flash and NVM Configuration Bits Erase Command ERASE - Erase Input Input High VDDIO - Internal pull-down enabled - Schmitt Trigger enabled(1) Reset/Test NRST Synchronous Microcontroller Reset I/O Permanent Internal Low pull-up VDDIO TST Test Select Input Permanent Internal - pull-down Wake-up WKUP[15:0] Wake-up Inputs Input - VDDIO - Universal Asynchronous Receiver Transceiver - UARTx URXDx UART Receive Data Input - - - UTXDx UART Transmit Data Output - - - PIO Controller - PIOA - PIOB - PIOC PA0-PA31 Parallel IO Controller A I/O - PB0-PB14 Parallel IO Controller B I/O - PC0-PC31 Parallel IO Controller C I/O - Reset State: VDDIO - PIO or System IOs(2) - Internal pull-up enabled - Schmitt Trigger enabled(1) PIO Controller - Parallel Capture Mode PIODC0-PIODC7 Parallel Capture Mode Data Input - PIODCCLK Parallel Capture Mode Clock Input - PIODCEN1-2 Parallel Capture Mode Enable Input - VDDIO - External Bus Interface D0-D7 Data Bus A0-A23 Address Bus NWAIT External Wait Signal I/O - - - Output - - - Input Low - - Static Memory Controller - SMC NCS0-NCS3 Chip Select Lines Output Low - - NRD Read Signal Output Low - - NWE Write Enable Output Low - - NAND Flash Logic NANDOE NAND Flash Output Enable Output Low - - NANDWE NAND Flash Write Enable Output Low - - 14 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 3-1. Signal Description List (Continued) Signal Name Function Type Active Level Voltage Reference Comments High Speed Multimedia Card Interface - HSMCI MCCK Multimedia Card Clock Output - - - MCCDA Multimedia Card Slot A Command I/O - - - MCDA0-MCDA3 Multimedia Card Slot A Data I/O - - - Universal Synchronous Asynchronous Receiver Transmitter - USARTx SCKx USARTx Serial Clock I/O - - - TXDx USARTx Transmit Data I/O - - - RXDx USARTx Receive Data Input - - - RTSx USARTx Request To Send Output - - - CTSx USARTx Clear To Send Input - - - DTR1 USART1 Data Terminal Ready Output - - - DSR1 USART1 Data Set Ready Input - - - DCD1 USART1 Data Carrier Detect Output - - - RI1 USART1 Ring Indicator Input - - - Synchronous Serial Controller - SSC TD SSC Transmit Data Output - - - RD SSC Receive Data Input - - - TK SSC Transmit Clock I/O - - - RK SSC Receive Clock I/O - - - TF SSC Transmit Frame Sync I/O - - - RF SSC Receive Frame Sync I/O - - - Input - - - Timer/Counter - TC TCLKx TC Channel x External Clock Input TIOAx TC Channel x I/O Line A I/O - - - TIOBx TC Channel x I/O Line B I/O - - - - - Pulse Width Modulation Controller - PWMC PWMHx PWM Waveform Output High for channel x PWMLx PWM Waveform Output Low for channel x PWMFI0-2 PWM Fault Input Output - Output - - Only output in complementary mode when dead time insertion is enabled. Input - - PWMFI1 and PWMFI2 on SAM4S4/S2 only SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 15 Table 3-1. Signal Description List (Continued) Signal Name Function Type Active Level Voltage Reference Comments Serial Peripheral Interface - SPI MISO Master In Slave Out I/O - - - MOSI Master Out Slave In I/O - - - SPCK SPI Serial Clock I/O - - - SPI_NPCS0 SPI Peripheral Chip Select 0 I/O Low - - SPI_NPCS1-SPI_NPCS3 SPI Peripheral Chip Select Output Low - - Two-Wire Interface - TWI TWDx TWIx Two-wire Serial Data I/O - - - TWCKx TWIx Two-wire Serial Clock I/O - - - Analog - - - Analog ADC, DAC and Analog Comparator Reference ADVREF 12-bit Analog-to-Digital Converter - ADC AD0-AD14 Analog Inputs Analog, Digital - - - ADTRG ADC Trigger Input - VDDIO - 12-bit Digital-to-Analog Converter - DAC DAC0-DAC1 Analog output DACTRG DAC Trigger Analog, Digital - - - Input - VDDIO - VDDIO - Fast Flash Programming Interface - FFPI PGMEN0-PGMEN2 Programming Enabling Input - PGMM0-PGMM3 Programming Mode Input - - PGMD0-PGMD15 Programming Data I/O - - PGMRDY Programming Ready Output High - PGMNVALID Data Direction Output Low PGMNOE Programming Read Input Low - PGMCK Programming Clock Input - - PGMNCMD Programming Command Input Low - VDDIO - USB Full Speed Device DDM USB Full Speed Data - DDP Note: 16 USB Full Speed Data + 1. 2. 3. 4. 5. Reset State: Analog, Digital - VDDIO - USB Mode - Internal Pull-down(3) Schmitt triggers can be disabled through PIO registers. Some PIO lines are shared with system I/Os. Refer to USB section of the product Electrical Characteristics for information on pull-down value in USB mode. See "Typical Powering Schematics" section for restrictions on voltage range of analog cells. TDO pin is set in input mode when the Cortex-M4 processor is not in debug mode. Thus the internal pull-up corresponding to this PIO line must be enabled to avoid current consumption due to floating input SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 4. Package and Pinout SAM4S devices are pin-to-pin compatible with SAM3N, SAM3S products in 48-, 64- and 100-pin versions, SAM4N and SAM7S legacy products in 64-pin versions. 4.1 100-lead Packages and Pinouts Refer to Table 1-1 and Table 1-2 for the overview of devices available in 100-lead packages. 4.1.1 100-lead LQFP Package Outline Figure 4-1. Orientation of the 100-lead LQFP Package 75 51 76 50 100 26 1 4.1.2 25 100-ball TFBGA Package Outline The 100-ball TFBGA package has a 0.8 mm ball pitch and respects Green Standards. Its dimensions are 9 x 9 x 1.1 mm. Figure 4-2 shows the orientation of the 100-ball TFBGA package. Figure 4-2. Orientation of the 100-ball TFBGA Package TOP VIEW 10 9 8 7 6 5 4 3 2 1 BALL A1 A B C D E F G H J K SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 17 4.1.3 100-ball VFBGA Package Outline Figure 4-3. 18 Orientation of the 100-ball VFBGA Package SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 4.1.4 100-lead LQFP Pinout Table 4-1. SAM4SD32/SD16/SA16/S16/S8/S4/S2 100-lead LQFP Pinout 1 ADVREF 26 GND 51 TDI/PB4 76 TDO/TRACESWO/PB5 2 GND 27 VDDIO 52 PA6/PGMNOE 77 JTAGSEL 3 PB0/AD4 28 PA16/PGMD4 53 PA5/PGMRDY 78 PC18 4 PC29/AD13 29 PC7 54 PC28 79 TMS/SWDIO/PB6 5 PB1/AD5 30 PA15/PGMD3 55 PA4/PGMNCMD 80 PC19 6 PC30/AD14 31 PA14/PGMD2 56 VDDCORE 81 PA31 7 PB2/AD6 32 PC6 57 PA27/PGMD15 82 PC20 8 PC31 33 PA13/PGMD1 58 PC8 83 TCK/SWCLK/PB7 9 PB3/AD7 34 PA24/PGMD12 59 PA28 84 PC21 10 VDDIN 35 PC5 60 NRST 85 VDDCORE 11 VDDOUT 36 VDDCORE 61 TST 86 PC22 12 PA17/PGMD5/AD0 37 PC4 62 PC9 87 ERASE/PB12 13 PC26 38 PA25/PGMD13 63 PA29 88 DDM/PB10 14 PA18/PGMD6/AD1 39 PA26/PGMD14 64 PA30 89 DDP/PB11 15 PA21/PGMD9/AD8 40 PC3 65 PC10 90 PC23 16 VDDCORE 41 PA12/PGMD0 66 PA3 91 VDDIO 17 PC27 42 PA11/PGMM3 67 PA2/PGMEN2 92 PC24 18 PA19/PGMD7/AD2 43 PC2 68 PC11 93 PB13/DAC0 19 PC15/AD11 44 PA10/PGMM2 69 VDDIO 94 PC25 20 PA22/PGMD10/AD9 45 GND 70 GND 95 GND 21 PC13/AD10 46 PA9/PGMM1 71 PC14 96 PB8/XOUT 22 PA23/PGMD11 47 PC1 72 PA1/PGMEN1 97 PB9/PGMCK/XIN 23 PC12/AD12 48 PA8/XOUT32/PGMM0 73 PC16 98 VDDIO 24 PA20/PGMD8/AD3 49 PA7/XIN32/ PGMNVALID 74 PA0/PGMEN0 99 PB14/DAC1 25 PC0 50 VDDIO 75 PC17 100 VDDPLL SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 19 4.1.5 100-ball TFBGA Pinout Table 4-2. SAM4SD32/SD16/SA16/S16/S8/S4/S2 100-ball TFBGA Pinout A1 PB1/AD5 C6 TCK/SWCLK/PB7 F1 PA18/PGMD6/AD1 H6 PC4 A2 PC29/AD13 C7 PC16 F2 PC26 H7 PA11/PGMM3 A3 VDDIO C8 PA1/PGMEN1 F3 VDDOUT H8 PC1 A4 PB9/PGMCK/XIN C9 PC17 F4 GND H9 PA6/PGMNOE A5 PB8/XOUT C10 PA0/PGMEN0 F5 VDDIO H10 TDI/PB4 A6 PB13/DAC0 D1 PB3/AD7 F6 PA27/PGMD15 J1 PC15/AD11 A7 DDP/PB11 D2 PB0/AD4 F7 PC8 J2 PC0 A8 DDM/PB10 D3 PC24 F8 PA28 J3 PA16/PGMD4 A9 TMS/SWDIO/PB6 D4 PC22 F9 TST J4 PC6 A10 JTAGSEL D5 GND F10 PC9 J5 PA24/PGMD12 B1 PC30/AD14 D6 GND G1 PA21/PGMD9/AD8 J6 PA25/PGMD13 B2 ADVREF D7 VDDCORE G2 PC27 J7 PA10/PGMM2 B3 GNDANA D8 PA2/PGMEN2 G3 PA15/PGMD3 J8 GND B4 PB14/DAC1 D9 PC11 G4 VDDCORE J9 VDDCORE B5 PC21 D10 PC14 G5 VDDCORE J10 VDDIO B6 PC20 E1 PA17/PGMD5/AD0 G6 PA26/PGMD14 K1 PA22/PGMD10/AD9 B7 PA31 E2 PC31 G7 PA12/PGMD0 K2 PC13/AD10 B8 PC19 E3 VDDIN G8 PC28 K3 PC12/AD12 B9 PC18 E4 GND G9 PA4/PGMNCMD K4 PA20/PGMD8/AD3 B10 TDO/TRACESWO/PB5 E5 GND G10 PA5/PGMRDY K5 PC5 C1 PB2/AD6 E6 NRST H1 PA19/PGMD7/AD2 K6 PC3 C2 VDDPLL E7 PA29 H2 PA23/PGMD11 K7 PC2 C3 PC25 E8 PA30 H3 PC7 K8 PA9/PGMM1 C4 PC23 E9 PC10 H4 PA14/PGMD2 K9 PA8/XOUT32/PGMM0 C5 ERASE/PB12 E10 PA3 H5 PA13/PGMD1 K10 PA7/XIN32/ PGMNVALID 20 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 4.1.6 100-ball VFBGA Pinout Table 4-3. SAM4SD32/SD16/SA16/S16/S8/S4/S2 100-ball VFBGA Pinout A1 ADVREF C6 PC9 F1 VDDOUT H6 PA12/PGMD0 A2 VDDPLL C7 TMS/SWDIO/PB6 F2 PA18/PGMD6/AD1 H7 PA9/PGMM1 A3 PB9/PGMCK/XIN C8 PA1/PGMEN1 F3 PA17/PGMD5/AD0 H8 VDDCORE A4 PB8/XOUT C9 PA0/PGMEN0 F4 GND H9 PA6/PGMNOE A5 JTAGSEL C10 PC16 F5 GND H10 PA5/PGMRDY A6 DDP/PB11 D1 PB1/AD5 F6 PC26 J1 PA20/AD3/PGMD8 A7 DDM/PB10 D2 PC30/AD14 F7 PA4/PGMNCMD J2 PC12/AD12 A8 PC20 D3 PC31 F8 PA28 J3 PA16/PGMD4 A9 PC19 D4 PC22 F9 TST J4 PC6 A10 TDO/TRACESWO/PB5 D5 PC5 F10 PC8 J5 PA24/PGMD12 B1 GNDANA D6 PA29 G1 PC15/AD11 J6 PA25/PGMD13 B2 PC25 D7 PA30 G2 PA19/PGMD7/AD2 J7 PA11/PGMM3 B3 PB14/DAC1 D8 GND G3 PA21/AD8/PGMD9 J8 VDDCORE B4 PB13/DAC0 D9 PC14 G4 PA15/PGMD3 J9 VDDCORE B5 PC23 D10 PC11 G5 PC3 J10 TDI/PB4 B6 PC21 E1 VDDIN G6 PA10/PGMM2 K1 PA23/PGMD11 B7 TCK/SWCLK/PB7 E2 PB3/AD7 G7 PC1 K2 PC0 B8 PA31 E3 PB2/AD6 G8 PC28 K3 PC7 B9 PC18 E4 GND G9 NRST K4 PA13/PGMD1 B10 PC17 E5 GND G10 PA27/PGMD15 K5 PA26/PGMD14 C1 PB0/AD4 E6 GND H1 PC13/AD10 K6 PC2 C2 PC29/AD13 E7 VDDIO H2 PA22/AD9/PGMD10 K7 VDDIO C3 PC24 E8 PC10 H3 PC27 K8 VDDIO C4 ERASE/PB12 E9 PA2/PGMEN2 H4 PA14/PGMD2 K9 PA8/XOUT32/PGMM0 C5 VDDCORE E10 PA3 H5 PC4 K10 PA7/XIN32/ PGMNVALID SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 21 4.2 64-lead Packages and Pinouts Refer to Table 1-1 and Table 1-2 for the overview of devices available in 64-lead packages. 4.2.1 64-lead LQFP Package Outline Figure 4-4. Orientation of the 64-lead LQFP Package 33 48 49 32 64 17 16 1 4.2.2 64-lead QFN Package Outline Figure 4-5. Orientation of the 64-lead QFN Package 64 1 48 16 33 17 4.2.3 TOP VIEW 64-ball WLCSP Package Outline Figure 4-6. 22 49 Orientation of the 64-ball WLCSP Package SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32 4.2.4 64-lead LQFP and QFN Pinout Table 4-4. 64-pin SAM4SD32/SD16/SA16/S16/S8/S4/S2 Pinout 1 ADVREF 17 GND 33 TDI/PB4 49 TDO/TRACESWO/PB5 2 GND 18 VDDIO 34 PA6/PGMNOE 50 JTAGSEL 3 PB0/AD4 19 PA16/PGMD4 35 PA5/PGMRDY 51 TMS/SWDIO/PB6 4 PB1/AD5 20 PA15/PGMD3 36 PA4/PGMNCMD 52 PA31 5 PB2/AD6 21 PA14/PGMD2 37 PA27/PGMD15 53 TCK/SWCLK/PB7 6 PB3/AD7 22 PA13/PGMD1 38 PA28 54 VDDCORE 7 VDDIN 23 PA24/PGMD12 39 NRST 55 ERASE/PB12 8 VDDOUT 24 VDDCORE 40 TST 56 DDM/PB10 9 PA17/PGMD5/AD0 25 PA25/PGMD13 41 PA29 57 DDP/PB11 10 PA18/PGMD6/AD1 26 PA26/PGMD14 42 PA30 58 VDDIO 11 PA21/PGMD9/AD8 27 PA12/PGMD0 43 PA3 59 PB13/DAC0 12 VDDCORE 28 PA11/PGMM3 44 PA2/PGMEN2 60 GND 13 PA19/PGMD7/AD2 29 PA10/PGMM2 45 VDDIO 61 XOUT/PB8 14 PA22/PGMD10/AD9 30 PA9/PGMM1 46 GND 62 XIN/PGMCK/PB9 15 PA23/PGMD11 31 PA8/XOUT32/PGMM0 47 PA1/PGMEN1 63 PB14/DAC1 16 PA20/PGMD8/AD3 32 PA7/XIN32/PGMNVALID 48 PA0/PGMEN0 64 VDDPLL Note: The bottom pad of the QFN package must be connected to ground. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 23 4.2.5 64-ball WLCSP Pinout Table 4-5. SAM4SD32/S32/SD16/S16/S8 64-ball WLCSP Pinout A1 PA31 C1 GND E1 PA29 G1 PA5 A2 PB7 C2 PA1 E2 TST G2 PA6 A3 VDDCORE C3 PA0 E3 NRST G3 PA9 A4 PB10 C4 PB12 E4 PA28 G4 PA11 A5 VDDIO C5 ADVREF E5 PA25 G5 VDDCORE A6 GND C6 PB3 E6 PA23 G6 PA14 A7 PB9 C7 PB1 E7 PA18 G7 PA20 A8 PB14 C8 PB0 E8 VDDIN G8 PA19 B1 PB5 D1 VDDIO F1 PA27 H1 PA7 B2 JTAGSEL D2 PA3 F2 VDDCORE H2 PA8 B3 PB6 D3 PA30 F3 PA4 H3 PA10 B4 PB11 D4 PA2 F4 PB4 H4 PA12 B5 PB13 D5 PA13 F5 PA26 H5 PA24 B6 VDDPLL D6 PA21 F6 PA16 H6 PA15 B7 PB8 D7 PA17 F7 PA22 H7 VDDIO B8 GND D8 PB2 F8 VDDOUT H8 GND Table 4-6. SAM4S4/S2 64-ball WLCSP Pinout A1 PB5 C1 GND E1 PA3 G1 VDDCORE A2 PA31 C2 PA0 E2 PA30 G2 PA4 A3 VDDCORE C3 PB7 E3 PA29 G3 PA9 A4 VDDIO C4 PB12 E4 PA27 G4 PA11 A5 GND C5 PA10 E5 PA24 G5 PA25 A6 PB8 C6 PB0 E6 PA18 G6 PA14 A7 PB9 C7 PB2 E7 PA17 G7 VDDIO A8 ADVREF C8 PB1 E8 VDDIN G8 PA19 B1 PA1 D1 VDDIO F1 TST H1 PB4 B2 JTAGSEL D2 PA2 F2 NRST H2 PA7 B3 PB10 D3 PA28 F3 PA5 H3 PA8 B4 PB11 D4 PB6 F4 PA6 H4 PA12 B5 PB13 D5 PA26 F5 PA13 H5 VDDCORE B6 VDDPLL D6 PA23 F6 PA22 H6 PA15 B7 PB14 D7 PA16 F7 PA21 H7 GND B8 GNDANA D8 PB3 F8 VDDOUT H8 PA20 24 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 4.3 48-lead Packages and Pinouts Refer to Table 1-1 for the overview of devices available in 48-lead packages. 4.3.1 48-lead LQFP Package Outline Figure 4-7. 4.3.2 Orientation of the 48-lead LQFP Package 48-lead QFN Package Outline Figure 4-8. Orientation of the 48-lead QFN Package SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 25 4.3.3 48-lead LQFP and QFN Pinout Table 4-7. SAM4S4/S2 48-pin LQFP and QFN Pinout 1 ADVREF 13 VDDIO 25 TDI/PB4 37 TDO/TRACESWO/PB5 2 GND 14 PA16/PGMD4 26 PA6/PGMNOE 38 JTAGSEL 3 PB0/AD4 15 PA15/PGMD3 27 PA5/PGMRDY 39 TMS/SWDIO/PB6 4 PB1/AD5 16 PA14/PGMD2 28 PA4/PGMNCMD 40 TCK/SWCLK/PB7 5 PB2/AD6 17 PA13/PGMD1 29 NRST 41 VDDCORE 6 PB3/AD7 18 VDDCORE 30 TST 42 ERASE/PB12 7 VDDIN 19 PA12/PGMD0 31 PA3 43 DDM/PB10 8 VDDOUT 20 PA11/PGMM3 32 PA2/PGMEN2 44 DDP/PB11 9 PA17/PGMD5/AD0 21 PA10/PGMM2 33 VDDIO 45 XOUT/PB8 10 PA18/PGMD6/AD1 22 PA9/PGMM1 34 GND 46 XIN/PB9/PGMCK 11 PA19/PGMD7/AD2 23 PA8/XOUT32/PGMM0 35 PA1/PGMEN1 47 VDDIO 12 PA20/AD3 24 PA7/XIN32/PGMNVALID 36 PA0/PGMEN0 48 VDDPLL Note: The bottom pad of the QFN package must be connected to ground. 26 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 5. Power Considerations 5.1 Power Supplies The SAM4S has several types of power supply pins: VDDCORE pins: Power the core, the first flash rail and the embedded memories and peripherals. Voltage ranges from 1.08 to 1.32 V. VDDIO pins: Power the peripheral I/O lines (input/output buffers), the second Flash rail, USB transceiver, backup part, 32 kHz crystal oscillator and oscillator pads. Voltage ranges from 1.62 to 3.6 V. VDDIN pin: Voltage regulator input, ADC, DAC and analog comparator power supply. Voltage ranges from 1.62 to 3.6 V. VDDPLL pin: Powers the PLLA, PLLB, the fast RC and the 3 to 20 MHz oscillator. Voltage ranges from 1.08 to 1.32 V. 5.2 Power-up Considerations 5.2.1 VDDIO Versus VDDCORE VDDIO must always be higher than or equal to VDDCORE. VDDIO must reach its minimum operating voltage (1.62 V) before VDDCORE has reached VDDCORE(min). The minimum slope for VDDCORE is defined by (VDDCORE(min) - VT+) / tRST. If VDDCORE rises at the same time as VDDIO, the VDDIO rising slope must be higher than or equal to 8.8 V/ms. If VDDCORE is powered by the internal regulator, all power-up considerations are met. Figure 5-1. VDDCORE and VDDIO Constraints at Startup Supply (V) VDDIO VDDIO(min) VDDCORE VDDCORE(min) VT+ tRST Time (t) Core supply POR output SLCK SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27 5.2.2 VDDIO Versus VDDIN At power-up, VDDIO needs to reach 0.6 V before VDDIN reaches 1.0 V. VDDIO voltage needs to be equal to or below (VDDIN voltage + 0.5 V). 5.3 Voltage Regulator The SAM4S embeds a voltage regulator that is managed by the Supply Controller. This internal regulator is designed to supply the internal core of SAM4S. It features two operating modes: In Normal mode, the voltage regulator consumes less than 500 A static current and draws 80 mA of output current. Internal adaptive biasing adjusts the regulator quiescent current depending on the required load current. In Wait mode quiescent current is only 5 A. In Backup mode, the voltage regulator consumes less than 1 A while its output (VDDOUT) is driven internally to GND. The default output voltage is 1.20 V and the start-up time to reach Normal mode is less than 300 s. For adequate input and output power supply decoupling/bypassing, refer to Table 44-4 "1.2V Voltage Regulator Characteristics" in Section 44. "Electrical Characteristics". 28 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 5.4 Typical Powering Schematics The SAM4S supports a 1.62-3.6 V single supply mode. The internal regulator input is connected to the source and its output feeds VDDCORE. Figure 5-2 below shows the power schematics. As VDDIN powers the voltage regulator, the ADC, DAC and the analog comparator, when the user does not want to use the embedded voltage regulator, it can be disabled by software via the SUPC (note that this is different from Backup mode). Figure 5-2. Single Supply VDDIO Main Supply (1.62-3.6 V) USB Transceivers ADC, DAC, Analog Comp. VDDIN VDDOUT Voltage Regulator VDDCORE VDDPLL Note: Restrictions: For USB, VDDIO needs to be greater than 3.0V. For ADC, DAC and Analog Comparator, VDDIN needs to be greater than 2.4V. Figure 5-3. Core Externally Supplied Main Supply (1.62-3.6 V) VDDIO USB Transceivers Can be the same supply ADC, DAC, Analog Comparator Supply (2.4-3.6 V) ADC, DAC, Analog Comp. VDDIN VDDOUT VDDCORE Supply (1.08-1.32V) Voltage Regulator VDDCORE VDDPLL Note: Restrictions: For USB, VDDIO needs to be greater than 3.0V. For ADC, DAC and Analog Comparator, VDDIN needs to be greater than 2.4V. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29 Figure 5-4 provides an example of the powering scheme when using a backup battery. Since the PIO state is preserved when in Backup mode, any free PIO line can be used to switch off the external regulator by driving the PIO line at low level (PIO is input, pull-up enabled after backup reset). External wake-up of the system can be from a push button or any signal. See Section 5.7 "Wake-up Sources" for further details. Figure 5-4. Backup Battery Backup Battery VDDIO USB Transceivers + ADC, DAC, Analog Comp. VDDIN Main Supply IN OUT 3.3V LDO VDDOUT Voltage Regulator VDDCORE ON/OFF VDDPLL PIOx (Output) WKUPx External wakeup signal Note: The two diodes provide a "switchover circuit" (for illustration purpose) between the backup battery and the main supply when the system is put in backup mode. Note: 5.5 Restrictions: For USB, VDDIO needs to be greater than 3.0V. For ADC, DAC and Analog Comparator, VDDIN needs to be greater than 2.4V. Active Mode Active mode is the normal running mode with the core clock running from the fast RC oscillator, the main crystal oscillator or the PLLA. The Power Management Controller can be used to adapt the frequency and to disable the peripheral clocks. 5.6 Low-power Modes The SAM4S has the following low-power modes: Backup mode, Wait mode and Sleep mode. Note: The Wait For Event instruction (WFE) of the Cortex-M4 core can be used to enter any of the low-power modes, however, this may add complexity in the design of application state machines. This is due to the fact that the WFE instruction goes along with an event flag of the Cortex core (cannot be managed by the software application). The event flag can be set by interrupts, a debug event or an event signal from another processor. Since it is possible for an interrupt to occur just before the execution of WFE, WFE takes into account events that happened in the past. As a result, WFE prevents the device from entering Wait mode if an interrupt event has occurred. Atmel has made provision to avoid using the WFE instruction. The workarounds to ease application design are as follows: - For Backup mode, switch off the voltage regulator and configure the VROFF bit in the Supply Controller Control Register (SUPC_CR). - For Wait mode, configure the WAITMODE bit in the PMC Clock Generator Main Oscillator Register of the Power Management Controller (PMC) - For Sleep mode, use the Wait for Interrupt (WFI) instruction. Complete information is available in Table 5-1 "Low-power Mode Configuration Summary". 30 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 5.6.1 Backup Mode The purpose of Backup mode is to achieve the lowest power consumption possible in a system which is performing periodic wake-ups to perform tasks but not requiring fast startup time. Total current consumption is 1 A typical (VDDIO = 1.8V at 25C). The Supply Controller, zero-power power-on reset, RTT, RTC, backup registers and 32 kHz oscillator (RC or crystal oscillator selected by software in the Supply Controller) are running. The regulator and the core supply are off. The SAM4S can be woke up from this mode using the pins WKUP0-15, the supply monitor (SM), the RTT or RTC wake-up event. Backup mode is entered by writing a 1 to the VROFF bit of the Supply Controller Control Register (SUPC_CR) (A key is needed to write the VROFF bit; refer to Section 18. "Supply Controller (SUPC)".) and with the SLEEPDEEP bit in the Cortex-M4 System Control Register set to 1. (See the power management description in Section 12. "ARM Cortex-M4 Processor"). To enter Backup mode using the VROFF bit: 1. Write a 1 to the VROFF bit of SUPC_CR. To enter Backup mode using the WFE instruction: 1. Write a 1 to the SLEEPDEEP bit of the Cortex-M4 processor. 2. Execute the WFE instruction of the processor. In both cases, exit from Backup mode happens if one of the following enable wake-up events occurs: 5.6.2 Level transition, configurable debouncing on pins WKUPEN0-15 Supply Monitor alarm RTC alarm RTT alarm Wait Mode The purpose of Wait mode is to achieve very low power consumption while maintaining the whole device in a powered state for a startup time of less than 10 s. Current consumption in Wait mode is typically 32 A (total current consumption) if the internal voltage regulator is used. In this mode, the clocks of the core, peripherals and memories are stopped. However, the core, peripherals and memories power supplies are still powered. From this mode, a fast start up is available. This mode is entered by setting the WAITMODE bit to 1 in the PMC Clock Generator Main Oscillator Register (CKGR_MOR) in conjunction with the Flash Low Power Mode field FLPM = 0 or FLPM = 1 in the PMC Fast Startup Mode Register (PMC_FSMR) or by the WFE instruction. The Cortex-M4 is able to handle external or internal events in order to wake-up the core. This is done by configuring the external lines WKUP0-15 as fast startup wake-up pins (refer to Section 5.8 "Fast Start-up"). RTC or RTT Alarm and USB wake-up events can be used to wake up the CPU. To enter Wait mode with WAITMODE bit: 1. Select the 4/8/12 MHz fast RC oscillator as Main Clock. 2. Set the FLPM field in the PMC_FSMR. 3. Set Flash wait state to 0. 4. Set the WAITMODE bit = 1 in CKGR_MOR. 5. Wait for Master Clock Ready MCKRDY = 1 in the PMC Status Register (PMC_SR). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31 To enter Wait mode with WFE: 1. Select the 4/8/12 MHz fast RC oscillator as Main Clock. 2. Set the FLPM field in the PMC_FSMR. 3. Set Flash wait state to 0. 4. Set the LPM bit in the PMC_FSMR. 5. Execute the Wait-For-Event (WFE) instruction of the processor. In both cases, depending on the value of the field FLPM, the Flash enters three different modes: FLPM = 0 in Standby mode (low consumption) FLPM = 1 in Deep power-down mode (extra low consumption) FLPM = 2 in Idle mode. Memory ready for Read access Table 5-1 summarizes the power consumption, wake-up time and system state in Wait mode. 5.6.3 Sleep Mode The purpose of Sleep mode is to optimize power consumption of the device versus response time. In this mode, only the core clock is stopped. The peripheral clocks can be enabled. The current consumption in this mode is application dependent. This mode is entered via Wait for Interrupt (WFI) or WFE instructions with bit LPM = 0 in PMC_FSMR. The processor can be woken up from an interrupt if the WFI instruction of the Cortex-M4 is used or from an event if the WFE instruction is used. 5.6.4 Low-power Mode Summary Table The modes detailed above are the main low-power modes. Each part can be set to on or off separately and wakeup sources can be configured individually. Table 5-1 provides the configuration summary of the low-power modes. 32 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 5-1. Low-power Mode Configuration Summary SUPC, 32 kHz Osc., RTC, RTT, GPBR, POR (Backup Region) Mode Regulator Core Memory Peripherals Mode Entry VROFF = 1 Backup Mode ON OFF OFF (Not powered) or WFE + SLEEPDEEP = 1 WAITMODE = 1 + FLPM = 0 Wait Mode w/Flash in Standby Mode ON ON Powered (Not clocked) or WFE + SLEEPDEEP = 0 + LPM = 1 + FLPM = 0 WAITMODE = 1 + FLPM = 1 Wait Mode w/Flash in Deep Power Down Mode ON ON Powered (Not clocked) or WFE + SLEEPDEEP = 0 + LPM = 1 + FLPM = 1 WFE SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Sleep Mode ON ON Powered(6) (Not clocked) or WFI + SLEEPDEEP = 0 + LPM = 0 Notes: Potential Wake Up Sources Core at Wake Up PIO State while in Low- PIO State Consumption (1) (2) Power Mode at Wake Up Wake-up Time(3) Previous state saved PIOA & PIOB & PIOC Inputs with pull ups 1 A typ(4) < 1 ms Clocked back Previous state saved Unchanged 32.2 A(5) < 10 s Any Event from: Fast startup through WKUP0-15 pins RTC alarm RTT alarm USB wake-up Clocked back Previous state saved Unchanged 27.6 A < 100 s Entry mode =WFI Interrupt Only; Entry mode =WFE Any Enabled Interrupt and/or Any Event from: Fast start-up through WKUP0-15 pins RTC alarm RTT alarm USB wake-up Clocked back Previous state saved Unchanged (7) (7) WKUP0-15 pins SM alarm RTC alarm RTT alarm Reset Any Event from: Fast startup through WKUP0-15 pins RTC alarm RTT alarm USB wake-up 33 1. The external loads on PIOs are not taken into account in the calculation. 2. Supply Monitor current consumption is not included. 3. When considering wake-up time, the time required to start the PLL is not taken into account. Once started, the device works with the 4/8/12 MHz fast RC oscillator. The user has to add the PLL start-up time if it is needed in the system. The wake-up time is defined as the time taken for wake up until the first instruction is fetched. 4. Total consumption 1 A typ to 1.8V on VDDIO at 25C. 5. 20.4 A on VDDCORE, 32.2 A for total current consumption. 6. Depends on MCK frequency. 7. Depends on MCK frequency. In this mode, the core is supplied but some peripherals can be clocked. 5.7 Wake-up Sources The wake-up events allow the device to exit the Backup mode. When a wake-up event is detected, the Supply Controller performs a sequence which automatically reenables the core power supply and the SRAM power supply, if they are not already enabled. 5.8 Fast Start-up The SAM4S allows the processor to restart in a few microseconds while the processor is in Wait mode. A fast start-up can occur upon detection of a low level on one of the 19 wake-up inputs (WKUP0 to 15 + USB + RTC + RTT). The fast restart circuitry is fully asynchronous and provides a fast start-up signal to the Power Management Controller. As soon as the fast start-up signal is asserted, the PMC automatically restarts the embedded 4/8/12 MHz Fast RC oscillator, switches the master clock on this 4 MHz clock and reenables the processor clock. 34 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 6. Input/Output Lines The SAM4S has several kinds of input/output (I/O) lines such as general purpose I/Os (GPIO) and system I/Os. GPIOs can have alternate functionality due to multiplexing capabilities of the PIO controllers. The same PIO line can be used whether in I/O mode or by the multiplexed peripheral. System I/Os include pins such as test pins, oscillators, erase or analog inputs. 6.1 General Purpose I/O Lines GPIO Lines are managed by PIO controllers. All I/Os have several input or output modes such as pull-up or pulldown, input Schmitt triggers, multi-drive (open-drain), glitch filters, debouncing or input change interrupt. Programming of these modes is performed independently for each I/O line through the PIO controller user interface. For more details, refer to Section 31. "Parallel Input/Output Controller (PIO)". Some GPIOs can have alternate function as analog input. When the GPIO is set in analog mode, all digital features of the I/O are disabled. The input/output buffers of the PIO lines are supplied through VDDIO power supply rail. The SAM4S embeds high-speed pads able to handle up to 70 MHz for HSMCI (MCK/2), 70 MHz for SPI clock lines and 46 MHz on other lines. See Section 44.12 "AC Characteristics" for more details. Typical pull-up and pulldown value is 100 k for all I/Os. Each I/O line also embeds an ODT (On-Die Termination), (see Figure 6-1). It consists of an internal series resistor termination scheme for impedance matching between the driver output (SAM4S) and the PCB trace impedance preventing signal reflection. The series resistor helps to reduce IOs switching current (di/dt) thereby reducing in turn, EMI. It also decreases overshoot and undershoot (ringing) due to inductance of interconnect between devices or between boards. In conclusion ODT helps diminish signal integrity issues. Figure 6-1. On-Die Termination Z0 ~ ZO + RODT ODT 36 Typ. RODT Receiver SAM4 Driver with ZO ~ 10 PCB Trace Z0 ~ 50 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 35 6.2 System I/O Lines System I/O lines are pins used by oscillators, test mode, reset and JTAG. Table 6-1 provides the SAM4S system I/O lines shared with PIO lines. These pins are software configurable as general-purpose I/O or system pins. At startup, the default function of these pins is always used. Table 6-1. System I/O Configuration Pin List SYSTEM_IO Bit Number Default Function After Reset Other Function Constraints For Normal Start 12 ERASE PB12 Low Level at startup(1) 10 DDM PB10 - 11 DDP PB11 - 7 TCK/SWCLK PB7 - 6 TMS/SWDIO PB6 - 5 TDO/TRACESWO PB5 - 4 TDI PB4 - - PA7 XIN32 - - PA8 XOUT32 - - PB9 XIN - - PB8 XOUT - Configuration In Matrix User Interface Registers (Refer to the System I/O Configuration Register in Section 25. "Bus Matrix (MATRIX)".) (2) (3) Notes: 1. If PB12 is used as PIO input in user applications, a low level must be ensured at startup to prevent Flash erase before the user application sets PB12 into PIO mode, 2. Refer to "Slow Clock Generator" in Section 18. "Supply Controller (SUPC)". 3. Refer to the 3 to 20 MHZ crystal oscillator information in Section 29. "Power Management Controller (PMC)". 6.2.1 Serial Wire JTAG Debug Port (SWJ-DP) Pins The SWJ-DP pins are TCK/SWCLK, TMS/SWDIO, TDO/SWO, TDI and commonly provided on a standard 20-pin JTAG connector defined by ARM. For more details about voltage reference and reset state, refer to Table 3-1 on page 13. At startup, SWJ-DP pins are configured in SWJ-DP mode to allow connection with debugging probe. Please refer to Section 13. "Debug and Test Features". SWJ-DP pins can be used as standard I/Os to provide users more general input/output pins when the debug port is not needed in the end application. Mode selection between SWJ-DP mode (System IO mode) and general IO mode is performed through the AHB Matrix Special Function Registers (MATRIX_SFR). Configuration of the pad for pull-up, triggers, debouncing and glitch filters is possible regardless of the mode. The JTAG pin and PA7 pin are used to select the JTAG Boundary Scan when asserted JTAGSEL at a high level and PA7 at low level. It integrates a permanent pull-down resistor of about 15 k to GND, so that it can be left unconnected for normal operations. By default, the JTAG Debug Port is active. If the debugger host wants to switch to the Serial Wire Debug Port, it must provide a dedicated JTAG sequence on TMS/SWDIO and TCK/SWCLK which disables the JTAG-DP and enables the SW-DP. When the Serial Wire Debug Port is active, TDO/TRACESWO can be used for trace. The asynchronous TRACE output (TRACESWO) is multiplexed with TDO. So the asynchronous trace can only be used with SW-DP, not JTAG-DP. For more information about SW-DP and JTAG-DP switching, please refer to Section 13. "Debug and Test Features". 36 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 6.3 Test Pin The TST pin is used for JTAG Boundary Scan Manufacturing Test or Fast Flash programming mode of the SAM4S series. The TST pin integrates a permanent pull-down resistor of about 15 k to GND, so that it can be left unconnected for normal operations. To enter fast programming mode, see Section 21. "Fast Flash Programming Interface (FFPI)". For more on the manufacturing and test mode, refer to Section 13. "Debug and Test Features". 6.4 NRST Pin The NRST pin is bidirectional. It is handled by the on-chip reset controller and can be driven low to provide a reset signal to the external components or asserted low externally to reset the microcontroller. It will reset the Core and the peripherals except the Backup region (RTC, RTT and Supply Controller). There is no constraint on the length of the reset pulse and the reset controller can guarantee a minimum pulse length. The NRST pin integrates a permanent pull-up resistor to VDDIO of about 100 k. By default, the NRST pin is configured as an input. 6.5 ERASE Pin The ERASE pin is used to reinitialize the Flash content (and some of its NVM bits) to an erased state (all bits read as logic level 1). The ERASE pin and the ROM code ensure an in-situ reprogrammability of the Flash content without the use of a debug tool. When the security bit is activated, the ERASE pin provides the capability to reprogram the Flash content. It integrates a pull-down resistor of about 100 k to GND, so that it can be left unconnected for normal operations. This pin is debounced by SCLK to improve the glitch tolerance. To avoid unexpected erase at power-up, a minimum ERASE pin assertion time is required. This time is defined in Table 44-74 "AC Flash Characteristics". The ERASE pin is a system I/O pin and can be used as a standard I/O. At startup, the ERASE pin is not configured as a PIO pin. If the ERASE pin is used as a standard I/O, startup level of this pin must be low to prevent unwanted erasing. Refer to Section 11.2 "Peripheral Signal Multiplexing on I/O Lines" on page 51. Also, if the ERASE pin is used as a standard I/O output, asserting the pin to low does not erase the Flash. 6.6 Anti-tamper Pins/Low-power Tamper Detection WKUP0 and WKUP1 generic wake-up pins can be used as anti-tamper pins. Anti-tamper pins detect intrusion, for example, into a housing box. Upon detection through a tamper switch, automatic, asynchronous and immediate clear of registers in the backup area will be performed. Anti-tamper pins can be used in all power modes (Backup/Wait/Sleep/Active). Anti-tampering events can be programmed so that half of the General Purpose Backup Registers (GPBR) are erased automatically. See "Supply Controller" section for further description. RTCOUT0 and RTCOUT1 pins can be used to generate waveforms from the RTC in order to take advantage of the RTC inherent prescalers while the RTC is the only powered circuitry (low-power mode, Backup mode) or in any active mode. Entering backup or low-power modes does not affect the waveform generation outputs. Antitampering pin detection can be synchronized with this signal. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37 7. Product Mapping Figure 7-1. SAM4S Product Mapping Code 0x00000000 0x00000000 Address memory space 0x40000000 Code 0x40004000 Peripherals HSMCI Boot Memory 0x00400000 0x00800000 Internal Flash Internal ROM 1 Mbyte bit band region 0x00C00000 0x20100000 0x40008000 SRAM SPI 0x4000C000 0x20400000 Reserved 0x22000000 0x24000000 0x40000000 External RAM 0x61000000 SMC Chip Select 0 0x62000000 SMC Chip Select 1 0x63000000 SMC Chip Select 2 0x64000000 SMC Chip Select 3 0x60000000 0x40010000 32 Mbytes bit band alias +0x40 Undefined +0x80 Peripherals 0x40014000 External SRAM +0x40 0xA0000000 +0x80 Reserved TC0 TC0 TC0 TC1 TC0 TC2 TC1 TC3 TC1 TC4 TC1 TC5 0x40018000 0xE0000000 TWI0 System Reserved 0x9FFFFFFF 0x4001C000 0xFFFFFFFF TWI1 0x40020000 0x400E0000 System Controller SMC 0x400E0200 offset block peripheral PWM 0x40024000 10 0x40028000 PMC 0x4002C000 USART1 0x400E0600 UART0 0x400E0740 5 8 UART1 UDP 0x400E0C00 9 6 EEFC1 PIOA 0x400E1000 PIOB 0x400E1200 PIOC 0x400E1400 RSTC +0x10 0x4003C000 DACC 0x40040000 0x40044000 11 12 13 1 SUPC CRCCU 0x40048000 RTT +0x50 WDT +0x60 RTC +0x90 GPBR 0x400E1600 Reserved 4 2 25 26 27 28 19 20 31 14 15 33 29 30 34 35 0x400E0000 System Controller 0x400E2600 0x40100000 Reserved 0x42000000 3 24 Reserved Reserved +0x30 Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ADC ACC 0x400E0E00 23 Reserved 0x40038000 EEFC0 SAM4S Series [DATASHEET] 21 0x40030000 0x40034000 0x400E0A00 38 22 Reserved CHIPID 0x400E0800 0x4007FFFF USART0 MATRIX 0x400E0400 ID 18 Reserved Undefined 0x1FFFFFFF 0x60000000 SSC 0x20000000 0x43FFFFFF 32 Mbytes bit band alias Reserved 0x60000000 1 Mbyte bit band regiion 8. Memories 8.1 Embedded Memories 8.1.1 Internal SRAM The following table shows the amount of high-speed SRAM embedded in the SAM4Sx devices. Table 8-1. Embedded High-speed SRAM per Device Device Flash Total Embedded High-speed SRAM SAM4SD32 2 x 1024 Kbytes 160 Kbytes SAM4SD16 2 x 512 Kbytes 160 Kbytes SAM4SA16 1024 Kbytes 160 Kbytes SAM4S16 1024 Kbytes 128 Kbytes SAM4S8 512 Kbytes 128 Kbytes SAM4S4 256 Kbytes 64 Kbytes SAM4S2 128 Kbytes 64 Kbytes The SRAM is accessible over system Cortex-M4 bus at address 0x2000 0000. The SRAM is in the bit band region. The bit band alias region is from 0x2200 0000 to 0x23FF FFFF. 8.1.2 Internal ROM The SAM4S embeds an internal ROM, which contains the SAM boot assistant (SAM-BA (R) ), In-Application Programming (IAP) routines and Fast Flash Programming Interface (FFPI). At any time, the ROM is mapped at address 0x0080 0000. 8.1.3 8.1.3.1 Embedded Flash Flash Overview The memory is organized in sectors. Each sector has a size of 64 Kbytes. The first sector of 64 Kbytes is divided into three smaller sectors. The three smaller sectors are organized to consist of two sectors of 8 Kbytes and one sector of 48 Kbytes. Refer to Figure 8-1, "Global Flash Organization". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39 Figure 8-1. Global Flash Organization Sector size Sector name 8 Kbytes Small Sector 0 8 Kbytes Small Sector 1 48 Kbytes Larger Sector 64 Kbytes Sector 1 64 Kbytes Sector n Sector 0 Each sector is organized in pages of 512 bytes. For sector 0: The smaller sector 0 has 16 pages of 512 bytes The smaller sector 1 has 16 pages of 512 bytes The larger sector has 96 pages of 512 bytes From Sector 1 to n: The rest of the array is composed of 64-Kbyte sectors of 128 pages, each page of 512 bytes. Refer to Figure 8-2, "Flash Sector Organization". 40 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 8-2. Flash Sector Organization A sector size is 64 Kbytes Sector 0 16 pages of 512 bytes Smaller sector 0 16 pages of 512 bytes Smaller sector 1 96 pages of 512 bytes Larger sector Sector 1 128 pages of 512 bytes Sector n 128 pages of 512 bytes Flash size varies by product: SAM4S2: the Flash size is 128 Kbytes in a single plane SAM4S4: the Flash size is 256 Kbytes in a single plane SAM4S8/S16: the Flash size is 512 Kbytes in a single plane Internal Flash address is 0x0040_0000 SAM4SD16/SA16: the Flash size is 2 x 512 Kbytes Internal Flash0 address is 0x0040_0000 Internal Flash1 address is 0x0048_0000 SAM4SD32: the Flash size is 2 x 1024 Kbytes Internal Flash0 address is 0x0040_0000 Internal Flash1 address is 0x0050_0000 Refer to Figure 8-3, "Flash Size" for the organization of the Flash depending on its size. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 41 Figure 8-3. Flash Size Flash 1 Mbytes Flash 512 Kbytes Flash 256 Kbytes 2 * 8 Kbytes 2 * 8 Kbytes 2 * 8 Kbytes 1 * 48 Kbytes 1 * 48 Kbytes 1 * 48 Kbytes 3 * 64 Kbytes 7 * 64 Kbytes 15 * 64 Kbytes The following erase commands can be used depending on the sector size: 8 Kbyte small sector Erase and write page (EWP) Erase and write page and lock (EWPL) Erase sector (ES) with FARG set to a page number in the sector to erase Erase pages (EPA) with FARG [1:0] = 0 to erase four pages or FARG [1:0] = 1 to erase eight pages. FARG [1:0] = 2 and FARG [1:0] = 3 must not be used. 48 Kbyte and 64 Kbyte sectors One block of 8 pages inside any sector, with the command Erase pages (EPA) with FARG[1:0] = 1 One block of 16 pages inside any sector, with the command Erase pages (EPA) and FARG[1:0] = 2 One block of 32 pages inside any sector, with the command Erase pages (EPA) and FARG[1:0] = 3 One sector with the command Erase sector (ES) and FARG set to a page number in the sector to erase Entire memory plane The entire Flash, with the command Erase all (EA) The Write commands of the Flash cannot be used under 330 kHz. 8.1.3.2 Enhanced Embedded Flash Controller The Enhanced Embedded Flash Controller manages accesses performed by the masters of the system. It enables reading the Flash and writing the write buffer. It also contains a User Interface, mapped on the APB. The Enhanced Embedded Flash Controller ensures the interface of the Flash block. It manages the programming, erasing, locking and unlocking sequences of the Flash using a full set of commands. One of the commands returns the embedded Flash descriptor definition that informs the system about the Flash organization, thus making the software generic. 8.1.3.3 Flash Speed The user must set the number of wait states depending on the frequency used. For more details, refer to Section 44.12 "AC Characteristics". 42 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 8.1.3.4 Error Code Correction (ECC) The Flash embeds an ECC module with 8 parity bits for each 64 data bits. The ECC is able to correct one unique error. The errors are detected while a read access is performed into memory array. The ECC (Hamming Algorithm) is a mechanism that encodes data in a manner that makes possible the identification and correction of certain errors in data. The ECC is capable of single bit error correction. 8.1.3.5 Lock Regions Several lock bits are used to protect write and erase operations on lock regions. A lock region is composed of several consecutive pages, and each lock region has its associated lock bit. Table 8-2. Lock Bit Number Product Number of Lock Bits Lock Region Size SAM4SD32 256 (128 + 128) 8 Kbytes SAM4SD16 128 (64 + 64) 8 Kbytes SAM4S16/SA16 128 8 Kbytes SAM4S8 64 8 Kbytes SAM4S4 32 8 Kbytes SAM4S2 16 8 Kbytes If a locked region erase or program command occurs, the command is aborted and the EEFC triggers an interrupt. The lock bits are software programmable through the EEFC User Interface. The command "Set Lock Bit" enables the protection. The command "Clear Lock Bit" unlocks the lock region. Asserting the ERASE pin clears the lock bits, thus unlocking the entire Flash. 8.1.3.6 Security Bit The SAM4SD32/SD16/S16/SA16/S8/S4/S2 feature one security bit based on a specific General Purpose NVM bit (GPNVM bit 0). When the security bit is enabled, any access to the Flash, SRAM, core registers and internal peripherals through the ICE interface or through the Fast Flash Programming Interface, is forbidden. This ensures the confidentiality of the code programmed in the Flash. This security bit can only be enabled through the command "Set General Purpose NVM Bit 0" of the EEFC User Interface. Disabling the security bit can only be achieved by asserting the ERASE pin at 1, and after a full Flash erase is performed. When the security bit is deactivated, all accesses to the Flash, SRAM, Core registers, Internal Peripherals are permitted. The ERASE pin integrates a permanent pull-down. Consequently, it can be left unconnected during normal operation. However, it is recommended, in harsh environment, to connect it directly to GND if the erase operation is not used in the application. To avoid unexpected erase at power-up, a minimum ERASE pin assertion time is required. This time is defined in Table 44-74 "AC Flash Characteristics". The erase operation is not performed when the system is in Wait mode with the Flash in deep-power-down mode. To make sure that the erase operation is performed after power-up, the system must not reconfigure the ERASE pin as GPIO or enter Wait mode with Flash in Deep-power-down mode before the ERASE pin assertion time has elapsed. The following sequence ensures the erase operation in all cases: 1. Assert the ERASE pin (High) 2. Assert the NRST pin (Low) 3. Power cycle the device SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43 4. 8.1.3.7 Maintain the ERASE pin high for at least the minimum assertion time. Calibration Bits NVM bits are used to calibrate the brownout detector and the voltage regulator. These bits are factory configured and cannot be changed by the user. The ERASE pin has no effect on the calibration bits. 8.1.3.8 Unique Identifier Each device integrates its own 128-bit unique identifier. These bits are factory-configured and cannot be changed by the user. The ERASE pin has no effect on the unique identifier. 8.1.3.9 User Signature Each device contains a user signature of 512 bytes. It can be used by the user to store user information such as trimming, keys, etc., that the customer does not want to be erased by asserting the ERASE pin or by software ERASE command. Read, write and erase of this area is allowed. 8.1.3.10 Fast Flash Programming Interface The Fast Flash Programming Interface allows programming the device through a multiplexed fully-handshaked parallel port. It allows gang programming with market-standard industrial programmers. The FFPI supports read, page program, page erase, full erase, lock, unlock and protect commands. 8.1.3.11 SAM-BA Boot The SAM-BA Boot is a default Boot Program which provides an easy way to program in-situ the on-chip Flash memory. The SAM-BA Boot Assistant supports serial communication via the UART and USB. The SAM-BA Boot provides an interface with SAM-BA Graphic User Interface (GUI). The SAM-BA Boot is in ROM and is mapped in Flash at address 0x0 when GPNVM bit 1 is set to 0. 8.1.3.12 GPNVM Bits The SAM4S16/S8/S4/S2 feature two GPNVM bits. The SAM4SA16/SD32/SD16 feature three GPNVM bits, coming from Flash 0, that can be cleared or set, respectively, through the "Clear GPNVM Bit" and "Set GPNVM Bit" commands of the EEFC0 User Interface. There is no GPNVM bit on Flash 1. The GPNVM0 is the security bit. The GPNVM1 is used to select the boot mode (boot always at 0x00) on ROM or Flash. The SAM4SD32/16 embeds an additional GPNVM bit, GPNVM2. GPNVM2 is used only to swap the Flash 0 and Flash 1. If GPNVM2 is ENABLE, the Flash 1 is mapped at address 0x0040_0000 (Flash 1 and Flash 0 are 44 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 continuous). If GPNVM2 is DISABLE, the Flash 0 is mapped at address 0x0040_0000 (Flash 0 and Flash 1 are continuous). Table 8-3. General-purpose Non-volatile Memory Bits Device Name GPNVM0 GPNVM1 GPNVM2 SAM4SD32 Flash Selection (Flash 0 or Flash 1) SAM4SD16 SAM4SA16 SAM4S16 Security Bit Boot Mode Selection SAM4S8 Not available SAM4S4 SAM4S2 8.1.4 Boot Strategies The system always boots at address 0x0. To ensure maximum boot possibilities, the memory layout can be changed using GPNVM bits. A general-purpose NVM (GPNVM) bit is used to boot either on the ROM (default) or from the Flash. The GPNVM bit can be cleared or set respectively through the commands "Clear GPNVM Bit" and "Set GPNVM Bit" of the EEFC User Interface. Setting GPNVM1 selects the boot from the Flash. Clearing it selects the boot from the ROM. Asserting ERASE clears the GPNVM1 and thus selects the boot from the ROM by default. Setting the GPNVM2 selects Flash 1, clearing it selects the boot from Flash 0. Asserting ERASE clears GPNVM2 and thus selects the boot from Flash 0 by default. GPNVM2 is available only on SAM4SD32/SD16/SA16. 8.2 External Memories The SAM4S features one External Bus Interface to provide an interface to a wide range of external memories and to any parallel peripheral. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 45 9. Real Time Event Management The events generated by peripherals are designed to be directly routed to peripherals managing/using these events without processor intervention. Peripherals receiving events contain logic by which to select the one required. 9.1 46 Embedded Characteristics Timers, PWM, IO peripherals generate event triggers which are directly routed to event managers such as ADC or DACC, for example, to start measurement/conversion without processor intervention. UART, USART, SPI, TWI, SSC, PWM, HSMCI, ADC, DACC, PIO also generate event triggers directly connected to Peripheral DMA Controller (PDC) for data transfer without processor intervention. Parallel capture logic is directly embedded in PIO and generates trigger event to PDC to capture data without processor intervention. PWM security events (faults) are in combinational form and directly routed from event generators (ADC, ACC, PMC, TIMER) to PWM module. PMC security event (clock failure detection) can be programmed to switch the MCK on reliable main RC internal clock without processor intervention. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 9.2 Real Time Event Mapping List Table 9-1. Real-time Event Mapping List Function Application Security General-purpose General-purpose Generalpurpose, motor control Safety Motor control Image capture Description Event Source Event Destination Immediate GPBR clear (asynchronous) on Tamper detection through WKUP0/1 IO pins (1) Parallel Input/Output Controller (PIO): WKUP0/1 General Purpose Backup Registers (GPBR) Automatic Switch to reliable main RC oscillator in case of Main Crystal Clock Failure (2) Power Management Controller (PMC) PMC Puts the PWM Outputs in Safe Mode (Main Crystal Clock Failure Detection) (2)(3) PMC Puts the PWM Outputs in Safe Mode (Overcurrent sensor, ...) (3)(4) Analog Comparator Controller (ACC) Puts the PWM Outputs in Safe Mode (Overspeed, Overcurrent detection ...) (3)(5) Analog-Front-EndController (ADC) Puts the PWM Outputs in Safe Mode (Overspeed detection through TIMER Quadrature Decoder) (3)(6) Timer Counter (TC) Generalpurpose, motor control Puts the PWM Outputs in Safe Mode (General Purpose Fault Inputs) (3) PIO Low-cost image sensor PC is embedded in PIO (Capture Image from Sensor directly to System Memory) (7) PIO Pulse Width Modulation (PWM) PDC PIO (ADTRG) General-purpose Trigger source selection in ADC (8) TC Output 1 Measurement trigger ADC TC Output 2 Motor control Delay measurement TC Output 0 Motor control ADC-PWM synchronization (9)(10) Trigger source selection in ADC (8) Propagation delay of external components (IOs, power transistor bridge driver, etc.) (11)(12) PWM Event Line 0 PWM Event Line 1 PWM Output Compare Line 0 TC Input (A/B) 0 PWM Output Compare Line 1 TC Input (A/B) 1 PWM Output Compare Line 2 TC Input (A/B) 2 PIO DATRG TC Output 0 Conversion trigger General-purpose Trigger source selection in DACC (13) TC Output 1 TC Output 2 Digital-Analog Converter Controller (DACC) PWM Event Line 0 (10) PWM Event Line 1 (10) Notes: 1. Refer to "Low-power Tamper Detection and Anti-Tampering" in Section 18. "Supply Controller (SUPC)" and "General Purpose Backup Register x" in "General Purpose Backup Registers (GPBR)" . 2. Refer to "Main Clock Failure Detector" in Section 29. "Power Management Controller (PMC)". 3. Refer to "Fault Inputs" and "Fault Protection" in "Pulse Width Modulation Controller (PWM)" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 47 4. Refer to "Fault Mode" in "Analog Comparator Controller (ACC)" . 5. Refer to "Fault Output" in Section 42. "Analog-to-Digital Converter (ADC)". 6. Refer to "Fault Mode" in Section 37. "Timer Counter (TC)". 7. Refer to "Parallel Capture Mode" in "Parallel Input/Output Controller (PIO)" . 8. Refer to "Conversion Triggers" and the ADC Mode Register (ADC_MR) in Section 42., "Analog-to-Digital Converter (ADC)". 9. Refer to PWM Comparison Value Register (PWM_CMPV) in Section 39. "Pulse Width Modulation Controller (PWM)". 10. Refer to "PWM Comparison Units" and "PWM Event Lines" in Section 39. "Pulse Width Modulation Controller (PWM)". 11. Refer to Section 39.6.2.2 "Comparator" in Section 39. "Pulse Width Modulation Controller (PWM)". 12. Refer to Section 37. "Timer Counter (TC)". 13. Refer to DACC Trigger Register (DACC_TRIGR) in Section 43. "Digital-to-Analog Converter Controller (DACC)". 48 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 10. System Controller The System Controller is a set of peripherals which allows handling of key elements of the system, such as power, resets, clocks, time, interrupts, watchdog, etc. 10.1 System Controller and Peripheral Mapping Refer to Figure 7-1, "SAM4S Product Mapping". All the peripherals are in the bit band region and are mapped in the bit band alias region. 10.2 Power-on-Reset, Brownout and Supply Monitor The SAM4S embeds three features to monitor, warn and/or reset the chip: Power-on-Reset on VDDIO Brownout Detector on VDDCORE Supply Monitor on VDDIO 10.2.1 Power-on-Reset The Power-on-Reset monitors VDDIO. It is always activated and monitors voltage at start up but also during power down. If VDDIO goes below the threshold voltage, the entire chip is reset. For more information, refer to Section 44. "Electrical Characteristics". 10.2.2 Brownout Detector on VDDCORE The Brownout Detector monitors VDDCORE. It is active by default. It can be deactivated by software through the Supply Controller Mode Register (SUPC_MR). It is especially recommended to disable it during low-power modes such as Wait or Sleep modes. If VDDCORE goes below the threshold voltage, the reset of the core is asserted. For more information, refer to Section 18. "Supply Controller (SUPC)" and Section 44. "Electrical Characteristics". 10.2.3 Supply Monitor on VDDIO The Supply Monitor monitors VDDIO. It is not active by default. It can be activated by software and is fully programmable with 16 steps for the threshold (between 1.6V to 3.4V). It is controlled by the Supply Controller (SUPC). A sample mode is possible. It allows to divide the supply monitor power consumption by a factor of up to 2048. For more information, refer to Section 18. "Supply Controller (SUPC)" and Section 44. "Electrical Characteristics". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 49 11. Peripherals 11.1 Peripheral Identifiers Table 11-1 defines the Peripheral Identifiers of the SAM4S. A peripheral identifier is required for the control of the peripheral interrupt with the Nested Vectored Interrupt Controller and control of the peripheral clock with the Power Management Controller. Table 11-1. 50 Peripheral Identifiers Instance ID Instance Name NVIC Interrupt 0 SUPC X Supply Controller 1 RSTC X Reset Controller 2 RTC X Real-Time Clock 3 RTT X Real-Time Timer 4 WDT X Watchdog Timer 5 PMC X Power Management Controller 6 EEFC0 X Enhanced Embedded Flash Controller 0 7 EEFC1 - Enhanced Embedded Flash Controller 1 8 UART0 X X Universal Asynchronous Receiver Transmitter 0 9 UART1 X X Universal Asynchronous Receiver Transmitter 1 10 SMC - X Static Memory Controller 11 PIOA X X Parallel I/O Controller A 12 PIOB X X Parallel I/O Controller B 13 PIOC X X Parallel I/O Controller C 14 USART0 X X Universal Synchronous Asynchronous Receiver Transmitter 0 15 USART1 X X Universal Synchronous Asynchronous Receiver Transmitter 1 16 - - - Reserved 17 - - - Reserved 18 HSMCI X X Multimedia Card Interface 19 TWI0 X X Two-Wire Interface 0 20 TWI1 X X Two-Wire Interface 1 21 SPI X X Serial Peripheral Interface 22 SSC X X Synchronous Serial Controller 23 TC0 X X Timer/Counter 0 24 TC1 X X Timer/Counter 1 25 TC2 X X Timer/Counter 2 26 TC3 X X Timer/Counter 3 27 TC4 X X Timer/Counter 4 28 TC5 X X Timer/Counter 5 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 PMC Clock Control Instance Description Table 11-1. 11.2 Peripheral Identifiers (Continued) Instance ID Instance Name NVIC Interrupt PMC Clock Control Instance Description 29 ADC X X Analog-to-Digital Converter 30 DACC X X Digital-to-Analog Converter Controller 31 PWM X X Pulse Width Modulation 32 CRCCU X X CRC Calculation Unit 33 ACC X X Analog Comparator Controller 34 UDP X X USB Device Port Peripheral Signal Multiplexing on I/O Lines The SAM4S features two PIO controllers on 64-pin versions (PIOA and PIOB) or three PIO controllers on the 100pin version (PIOA, PIOB and PIOC), that multiplex the I/O lines of the peripheral set. The SAM4S 64-pin and 100-pin PIO controllers control up to 32 lines. Each line can be assigned to one of three peripheral functions: A, B or C. The multiplexing tables in the following tables define how the I/O lines of the peripherals A, B and C are multiplexed on the PIO Controllers. The column "Comments" has been inserted in this table for the user's own comments; it may be used to track how pins are defined in an application. Note that some peripheral functions which are output only, might be duplicated within the tables. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 51 11.2.1 PIO Controller A Multiplexing Table 11-2. Multiplexing on PIO Controller A (PIOA) I/O Line Peripheral A Peripheral B Peripheral C Peripheral D(1) Extra Function System Function Comments (2) PA0 PWMH0 TIOA0 A17 WKUP0 PA1 PWMH1 TIOB0 A18 WKUP1(2) PA2 PWMH2 SCK0 DATRG WKUP2(2) PA3 TWD0 NPCS3 PA4 TWCK0 TCLK0 WKUP3(2) PA5 RXD0 NPCS3 WKUP4(2) PA6 TXD0 PCK0 PA7 RTS0 PWMH3 PA8 CTS0 ADTRG PA9 URXD0 NPCS1 PWMFI0 PA10 UTXD0 NPCS2 PWMFI1(1) PA11 NPCS0 PWMH0 PA12 MISO PWMH1 PA13 MOSI PWMH2 PA14 SPCK PWMH3 PA15 TF TIOA1 PWML3 WKUP14/PIODCEN1(4) PA16 TK TIOB1 PWML2 WKUP15/PIODCEN2(4) PA17 TD PCK1 PWMH3 AD0(5) PA18 RD PCK2 A14 PA19 RK PWML0 A15 AD2/WKUP9(2) PA20 RF PWML1 A16 AD3/WKUP10(2) PA21 RXD1 PCK1 XIN32(3) WKUP5(2) XOUT32(3) WKUP6(2) WKUP7(2) WKUP8(2) PWMFI2(1) AD1(5) AD8(5) 64-/100-pin versions (5) 64-/100-pin versions PA22 TXD1 NPCS3 NCS2 AD9 PA23 SCK1 PWMH0 A19 PIODCCLK(6) 64-/100-pin versions PA24 RTS1 PWMH1 A20 PIODC0 64-/100-pin versions PA25 CTS1 PWMH2 A23 PIODC1 64-/100-pin versions PA26 DCD1 TIOA2 MCDA2 PIODC2 64-/100-pin versions PA27 DTR1 TIOB2 MCDA3 PIODC3 64-/100-pin versions PA28 DSR1 TCLK1 MCCDA PIODC4 64-/100-pin versions PA29 RI1 TCLK2 MCCK PIODC5 64-/100-pin versions (2) PA30 PWML2 NPCS2 MCDA0 WKUP11 /PIODC6 64-/100-pin versions PA31 NPCS1 PCK2 MCDA1 PIODC7 64-/100-pin versions Notes: 52 1. Only available in SAM4S4x and SAM4S2x. 2. WKUPx can be used if PIO controller defines the I/O line as "input". 3. Refer to Section 6.2 "System I/O Lines". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 4. PIODCENx/PIODCx has priority over WKUPx. Refer to Section 31.5.13 "Parallel Capture Mode". 5. To select this extra function, refer to Section 42.5.3 "Analog Inputs". 6. To select this extra function, refer to "Section 31.5.13 "Parallel Capture Mode". 11.2.2 PIO Controller B Multiplexing Table 11-3. I/O Line Multiplexing on PIO Controller B (PIOB) Peripheral A Peripheral B Peripheral C Extra Function System Function Comments (1) PB0 PWMH0 AD4/RTCOUT0 PB1 PWMH1 AD5/RTCOUT1(1) PB2 URXD1 NPCS2 AD6/WKUP12(2) PB3 UTXD1 PCK2 AD7(3) PB4 TWD1 PWMH2 PB5 TWCK1 PWML0 TDI(4) WKUP13(2) TDO/TRACESWO(4) PB6 TMS/SWDIO(4) PB7 TCK/SWCLK(4) PB8 XOUT(4) PB9 XIN(4) PB10 DDM PB11 DDP ERASE(4) PB12 PWML1 PB13 PWML2 PCK0 DAC0(5) 64-/100-pin versions PB14 NPCS1 PWMH3 DAC1(5) 64-/100-pin versions Notes: 1. 2. 3. 4. 5. Analog input has priority over RTCOUTx pin. See Section 16.5.8 "Waveform Generation". WKUPx can be used if PIO controller defines the I/O line as "input". To select this extra function, refer to Section 42.5.3 "Analog Inputs". Refer to Section 6.2 "System I/O Lines". DAC0 is selected when DACC_CHER.CH0 is set. DAC1 is selected when DACC_CHER.CH1 is set. See Section 43.7.3 "DACC Channel Enable Register". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 53 11.2.3 PIO Controller C Multiplexing Table 11-4. I/O Line Multiplexing on PIO Controller C (PIOC) System Function Peripheral B PC0 D0 PWML0 100-pin version PC1 D1 PWML1 100-pin version PC2 D2 PWML2 100-pin version PC3 D3 PWML3 100-pin version PC4 D4 NPCS1 100-pin version PC5 D5 100-pin version PC6 D6 100-pin version PC7 D7 100-pin version PC8 NWE 100-pin version PC9 NANDOE 100-pin version PC10 NANDWE 100-pin version PC11 NRD PC12 Peripheral C Extra Function Peripheral A Comments 100-pin version NCS3 100-pin version AD10 (1) 100-pin version PC13 NWAIT PC14 NCS0 PC15 NCS1 PC16 A21/NANDALE 100-pin version PC17 A22/NANDCLE 100-pin version PC18 A0 PWMH0 100-pin version PC19 A1 PWMH1 100-pin version PC20 A2 PWMH2 100-pin version PC21 A3 PWMH3 100-pin version PC22 A4 PWML3 100-pin version PC23 A5 TIOA3 100-pin version PC24 A6 TIOB3 100-pin version PC25 A7 TCLK3 100-pin version PC26 A8 TIOA4 100-pin version PC27 A9 TIOB4 100-pin version PC28 A10 TCLK4 PC29 A11 PWML0 AD12 (1) 100-pin version PWML1 TIOA5 PC30 A12 TIOB5 PC31 A13 TCLK5 Note: 54 1. To select this extra function, refer to Section 42.5.3 "Analog Inputs". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 AD11(1) 100-pin version 100-pin version AD13 (1) 100-pin version AD14 (1) 100-pin version 100-pin version 12. ARM Cortex-M4 Processor 12.1 Description The Cortex-M4 processor is a high performance 32-bit processor designed for the microcontroller market. It offers significant benefits to developers, including outstanding processing performance combined with fast interrupt handling, enhanced system debug with extensive breakpoint and trace capabilities, efficient processor core, system and memories, ultra-low power consumption with integrated sleep modes, and platform security robustness, with integrated memory protection unit (MPU). The Cortex-M4 processor is built on a high-performance processor core, with a 3-stage pipeline Harvard architecture, making it ideal for demanding embedded applications. The processor delivers exceptional power efficiency through an efficient instruction set and extensively optimized design, providing high-end processing hardware including a range of single-cycle and SIMD multiplication and multiply-with-accumulate capabilities, saturating arithmetic and dedicated hardware division. To facilitate the design of cost-sensitive devices, the Cortex-M4 processor implements tightly-coupled system components that reduce processor area while significantly improving interrupt handling and system debug capabilities. The Cortex-M4 processor implements a version of the Thumb(R) instruction set based on Thumb-2 technology, ensuring high code density and reduced program memory requirements. The Cortex-M4 instruction set provides the exceptional performance expected of a modern 32-bit architecture, with the high code density of 8-bit and 16-bit microcontrollers. The Cortex-M4 processor closely integrates a configurable NVIC, to deliver industry-leading interrupt performance. The NVIC includes a non-maskable interrupt (NMI), and provides up to 256 interrupt priority levels. The tight integration of the processor core and NVIC provides fast execution of interrupt service routines (ISRs), dramatically reducing the interrupt latency. This is achieved through the hardware stacking of registers, and the ability to suspend load-multiple and store-multiple operations. Interrupt handlers do not require wrapping in assembler code, removing any code overhead from the ISRs. A tail-chain optimization also significantly reduces the overhead when switching from one ISR to another. To optimize low-power designs, the NVIC integrates with the sleep modes, that include a deep sleep function that enables the entire device to be rapidly powered down while still retaining program state. 12.1.1 System Level Interface The Cortex-M4 processor provides multiple interfaces using AMBA(R) technology to provide high speed, low latency memory accesses. It supports unaligned data accesses and implements atomic bit manipulation that enables faster peripheral controls, system spinlocks and thread-safe Boolean data handling. The Cortex-M4 processor has a Memory Protection Unit (MPU) that provides fine grain memory control, enabling applications to utilize multiple privilege levels, separating and protecting code, data and stack on a task-by-task basis. Such requirements are becoming critical in many embedded applications such as automotive. 12.1.2 Integrated Configurable Debug The Cortex-M4 processor implements a complete hardware debug solution. This provides high system visibility of the processor and memory through either a traditional JTAG port or a 2-pin Serial Wire Debug (SWD) port that is ideal for microcontrollers and other small package devices. For system trace the processor integrates an Instrumentation Trace Macrocell (ITM) alongside data watchpoints and a profiling unit. To enable simple and cost-effective profiling of the system events these generate, a Serial Wire Viewer (SWV) can export a stream of software-generated messages, data trace, and profiling information through a single pin. The Flash Patch and Breakpoint Unit (FPB) provides up to eight hardware breakpoint comparators that debuggers can use. The comparators in the FPB also provide remap functions of up to eight words in the program code in the SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 55 CODE memory region. This enables applications stored on a non-erasable, ROM-based microcontroller to be patched if a small programmable memory, for example flash, is available in the device. During initialization, the application in ROM detects, from the programmable memory, whether a patch is required. If a patch is required, the application programs the FPB to remap a number of addresses. When those addresses are accessed, the accesses are redirected to a remap table specified in the FPB configuration, which means the program in the nonmodifiable ROM can be patched. 12.2 Embedded Characteristics Tight integration of system peripherals reduces area and development costs Thumb instruction set combines high code density with 32-bit performance Code-patch ability for ROM system updates Power control optimization of system components Integrated sleep modes for low power consumption Fast code execution permits slower processor clock or increases sleep mode time Hardware division and fast digital-signal-processing oriented multiply accumulate Saturating arithmetic for signal processing Deterministic, high-performance interrupt handling for time-critical applications Memory Protection Unit (MPU) for safety-critical applications Extensive debug and trace capabilities: 12.3 Serial Wire Debug and Serial Wire Trace reduce the number of pins required for debugging, tracing, and code profiling. Block Diagram Figure 12-1. Typical Cortex-M4 Implementation Cortex-M4 Processor NVIC Debug Access Port Processor Core Memory Protection Unit Flash Patch Serial Wire Viewer Data Watchpoints Bus Matrix Code Interface 56 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SRAM and Peripheral Interface 12.4 Cortex-M4 Models 12.4.1 Programmers Model This section describes the Cortex-M4 programmers model. In addition to the individual core register descriptions, it contains information about the processor modes and privilege levels for software execution and stacks. 12.4.1.1 Processor Modes and Privilege Levels for Software Execution The processor modes are: Thread mode Used to execute application software. The processor enters the Thread mode when it comes out of reset. Handler mode Used to handle exceptions. The processor returns to the Thread mode when it has finished exception processing. The privilege levels for software execution are: Unprivileged The software: Has limited access to the MSR and MRS instructions, and cannot use the CPS instruction Cannot access the System Timer, NVIC, or System Control Block Might have a restricted access to memory or peripherals. Unprivileged software executes at the unprivileged level. Privileged The software can use all the instructions and has access to all resources. Privileged software executes at the privileged level. In Thread mode, the Control Register controls whether the software execution is privileged or unprivileged, see "Control Register" . In Handler mode, software execution is always privileged. Only privileged software can write to the Control Register to change the privilege level for software execution in Thread mode. Unprivileged software can use the SVC instruction to make a supervisor call to transfer control to privileged software. 12.4.1.2 Stacks The processor uses a full descending stack. This means the stack pointer holds the address of the last stacked item in memory When the processor pushes a new item onto the stack, it decrements the stack pointer and then writes the item to the new memory location. The processor implements two stacks, the main stack and the process stack, with a pointer for each held in independent registers, see "Stack Pointer" . In Thread mode, the Control Register controls whether the processor uses the main stack or the process stack, see "Control Register" . In Handler mode, the processor always uses the main stack. The options for processor operations are: Table 12-1. Processor Mode Summary of processor mode, execution privilege level, and stack use options Used to Execute Privilege Level for Software Execution Thread Applications Privileged or unprivileged Handler Exception handlers Always privileged Note: 1. Stack Used (1) Main stack or process stack(1) Main stack See "Control Register" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 57 12.4.1.3 Core Registers Figure 12-2. Processor Core Registers R0 R1 R2 R3 Low registers R4 R5 R6 General-purpose registers R7 R8 R9 High registers R10 R11 R12 Stack Pointer SP (R13) Link Register LR (R14) Program Counter PC (R15) PSR PSP MSP Banked version of SP Program status register PRIMASK FAULTMASK Exception mask registers Special registers BASEPRI CONTROL Table 12-2. CONTROL register Core Processor Registers Register Name Access(1) Required Privilege(2) Reset General-purpose registers R0-R12 Read/Write Either Unknown Stack Pointer MSP Read/Write Privileged See description Stack Pointer PSP Read/Write Either Unknown Link Register LR Read/Write Either 0xFFFFFFFF Program Counter PC Read/Write Either See description Program Status Register PSR Read/Write Privileged 0x01000000 Application Program Status Register APSR Read/Write Either 0x00000000 Interrupt Program Status Register IPSR Read-only Privileged 0x00000000 Execution Program Status Register EPSR Read-only Privileged 0x01000000 Priority Mask Register PRIMASK Read/Write Privileged 0x00000000 Fault Mask Register FAULTMASK Read/Write Privileged 0x00000000 Base Priority Mask Register BASEPRI Read/Write Privileged 0x00000000 Control Register CONTROL Read/Write Privileged 0x00000000 Notes: 58 1. Describes access type during program execution in thread mode and Handler mode. Debug access can differ. 2. An entry of Either means privileged and unprivileged software can access the register. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.4.1.4 General-purpose Registers R0-R12 are 32-bit general-purpose registers for data operations. 12.4.1.5 Stack Pointer The Stack Pointer (SP) is register R13. In Thread mode, bit[1] of the Control Register indicates the stack pointer to use: 0 = Main Stack Pointer (MSP). This is the reset value. 1 = Process Stack Pointer (PSP). On reset, the processor loads the MSP with the value from address 0x00000000. 12.4.1.6 Link Register The Link Register (LR) is register R14. It stores the return information for subroutines, function calls, and exceptions. On reset, the processor loads the LR value 0xFFFFFFFF. 12.4.1.7 Program Counter The Program Counter (PC) is register R15. It contains the current program address. On reset, the processor loads the PC with the value of the reset vector, which is at address 0x00000004. Bit[0] of the value is loaded into the EPSR T-bit at reset and must be 1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 59 12.4.1.8 Program Status Register Name: PSR Access: Read/Write Reset: 0x000000000 31 N 30 Z 29 C 28 V 27 Q 26 23 22 21 20 25 24 T 19 18 17 16 12 11 10 9 - 8 ISR_NUMBER 4 3 2 1 0 ICI/IT - 15 14 13 ICI/IT 7 6 5 ISR_NUMBER The Program Status Register (PSR) combines: * Application Program Status Register (APSR) * Interrupt Program Status Register (IPSR) * Execution Program Status Register (EPSR). These registers are mutually exclusive bitfields in the 32-bit PSR. The PSR accesses these registers individually or as a combination of any two or all three registers, using the register name as an argument to the MSR or MRS instructions. For example: * Read of all the registers using PSR with the MRS instruction * Write to the APSR N, Z, C, V and Q bits using APSR_nzcvq with the MSR instruction. The PSR combinations and attributes are: Name Access Combination PSR Read/Write(1)(2) APSR, EPSR, and IPSR IEPSR Read-only EPSR and IPSR IAPSR APSR and IPSR (2) APSR and EPSR Read/Write EAPSR Notes: (1) Read/Write 1. The processor ignores writes to the IPSR bits. 2. Reads of the EPSR bits return zero, and the processor ignores writes to these bits. See the instruction descriptions "MRS" and "MSR" for more information about how to access the program status registers. 60 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.4.1.9 Application Program Status Register Name: APSR Access: Read/Write Reset: 0x000000000 31 N 30 Z 23 22 29 C 28 V 27 Q 26 21 20 19 18 - 15 14 25 - 24 17 16 GE[3:0] 13 12 11 10 9 8 3 2 1 0 - 7 6 5 4 - The APSR contains the current state of the condition flags from previous instruction executions. * N: Negative Flag 0: Operation result was positive, zero, greater than, or equal 1: Operation result was negative or less than. * Z: Zero Flag 0: Operation result was not zero 1: Operation result was zero. * C: Carry or Borrow Flag Carry or borrow flag: 0: Add operation did not result in a carry bit or subtract operation resulted in a borrow bit 1: Add operation resulted in a carry bit or subtract operation did not result in a borrow bit. * V: Overflow Flag 0: Operation did not result in an overflow 1: Operation resulted in an overflow. * Q: DSP Overflow and Saturation Flag Sticky saturation flag: 0: Indicates that saturation has not occurred since reset or since the bit was last cleared to zero 1: Indicates when an SSAT or USAT instruction results in saturation. This bit is cleared to zero by software using an MRS instruction. * GE[19:16]: Greater Than or Equal Flags See "SEL" for more information. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 61 12.4.1.10 Interrupt Program Status Register Name: IPSR Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 - 23 22 21 20 - 15 14 13 12 - 11 10 9 8 ISR_NUMBER 7 6 5 4 3 2 1 0 ISR_NUMBER The IPSR contains the exception type number of the current Interrupt Service Routine (ISR). * ISR_NUMBER: Number of the Current Exception 0 = Thread mode 1 = Reserved 2 = NMI 3 = Hard fault 4 = Memory management fault 5 = Bus fault 6 = Usage fault 7-10 = Reserved 11 = SVCall 12 = Reserved for Debug 13 = Reserved 14 = PendSV 15 = SysTick 16 = IRQ0 49 = IRQ34 See "Exception Types" for more information. 62 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.4.1.11 Execution Program Status Register Name: EPSR Access: Read/Write Reset: 0x000000000 31 23 30 22 29 - 28 21 20 27 26 25 24 T 16 ICI/IT 19 18 17 11 10 9 - 15 14 13 12 ICI/IT 7 6 5 8 - 4 3 2 1 0 - The EPSR contains the Thumb state bit, and the execution state bits for either the If-Then (IT) instruction, or the Interruptible-Continuable Instruction (ICI) field for an interrupted load multiple or store multiple instruction. Attempts to read the EPSR directly through application software using the MSR instruction always return zero. Attempts to write the EPSR using the MSR instruction in the application software are ignored. Fault handlers can examine the EPSR value in the stacked PSR to indicate the operation that is at fault. See "Exception Entry and Return" . * ICI: Interruptible-continuable Instruction When an interrupt occurs during the execution of an LDM, STM, PUSH, POP, VLDM, VSTM, VPUSH, or VPOP instruction, the processor: - Stops the load multiple or store multiple instruction operation temporarily - Stores the next register operand in the multiple operation to EPSR bits[15:12]. After servicing the interrupt, the processor: - Returns to the register pointed to by bits[15:12] - Resumes the execution of the multiple load or store instruction. When the EPSR holds the ICI execution state, bits[26:25,11:10] are zero. * IT: If-Then Instruction Indicates the execution state bits of the IT instruction. The If-Then block contains up to four instructions following an IT instruction. Each instruction in the block is conditional. The conditions for the instructions are either all the same, or some can be the inverse of others. See "IT" for more information. * T: Thumb State The Cortex-M4 processor only supports the execution of instructions in Thumb state. The following can clear the T bit to 0: - Instructions BLX, BX and POP{PC} - Restoration from the stacked xPSR value on an exception return - Bit[0] of the vector value on an exception entry or reset. Attempting to execute instructions when the T bit is 0 results in a fault or lockup. See "Lockup" for more information. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 63 12.4.1.12 Exception Mask Registers The exception mask registers disable the handling of exceptions by the processor. Disable exceptions where they might impact on timing critical tasks. To access the exception mask registers use the MSR and MRS instructions, or the CPS instruction to change the value of PRIMASK or FAULTMASK. See "MRS" , "MSR" , and "CPS" for more information. 12.4.1.13 Priority Mask Register Name: PRIMASK Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 PRIMASK - 23 22 21 20 - 15 14 13 12 - 7 6 5 4 - The PRIMASK register prevents the activation of all exceptions with a configurable priority. * PRIMASK 0: No effect 1: Prevents the activation of all exceptions with a configurable priority. 64 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.4.1.14 Fault Mask Register Name: FAULTMASK Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 FAULTMASK - 23 22 21 20 - 15 14 13 12 - 7 6 5 4 - The FAULTMASK register prevents the activation of all exceptions except for Non-Maskable Interrupt (NMI). * FAULTMASK 0: No effect. 1: Prevents the activation of all exceptions except for NMI. The processor clears the FAULTMASK bit to 0 on exit from any exception handler except the NMI handler. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 65 12.4.1.15 Base Priority Mask Register Name: BASEPRI Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 - 23 22 21 20 - 15 14 13 12 - 7 6 5 4 BASEPRI The BASEPRI register defines the minimum priority for exception processing. When BASEPRI is set to a nonzero value, it prevents the activation of all exceptions with same or lower priority level as the BASEPRI value. * BASEPRI Priority mask bits: 0x0000: No effect Nonzero: Defines the base priority for exception processing The processor does not process any exception with a priority value greater than or equal to BASEPRI. This field is similar to the priority fields in the interrupt priority registers. The processor implements only bits[7:4] of this field, bits[3:0] read as zero and ignore writes. See "Interrupt Priority Registers" for more information. Remember that higher priority field values correspond to lower exception priorities. 66 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.4.1.16 Control Register Name: CONTROL Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 - 1 SPSEL 0 nPRIV - 23 22 21 20 - 15 14 13 12 - 7 6 5 - 4 The Control Register controls the stack used and the privilege level for software execution when the processor is in Thread mode. * SPSEL: Active Stack Pointer Defines the current stack: 0: MSP is the current stack pointer. 1: PSP is the current stack pointer. In Handler mode, this bit reads as zero and ignores writes. The Cortex-M4 updates this bit automatically on exception return. * nPRIV: Thread Mode Privilege Level Defines the Thread mode privilege level: 0: Privileged. 1: Unprivileged. Handler mode always uses the MSP, so the processor ignores explicit writes to the active stack pointer bit of the Control Register when in Handler mode. The exception entry and return mechanisms update the Control Register based on the EXC_RETURN value. In an OS environment, ARM recommends that threads running in Thread mode use the process stack, and the kernel and exception handlers use the main stack. By default, the Thread mode uses the MSP. To switch the stack pointer used in Thread mode to the PSP, either: * Use the MSR instruction to set the Active stack pointer bit to 1, see "MSR" , or * Perform an exception return to Thread mode with the appropriate EXC_RETURN value, see Table 12-10. Note: When changing the stack pointer, the software must use an ISB instruction immediately after the MSR instruction. This ensures that instructions after the ISB execute using the new stack pointer. See "ISB" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 67 12.4.1.17 Exceptions and Interrupts The Cortex-M4 processor supports interrupts and system exceptions. The processor and the Nested Vectored Interrupt Controller (NVIC) prioritize and handle all exceptions. An exception changes the normal flow of software control. The processor uses the Handler mode to handle all exceptions except for reset. See "Exception Entry" and "Exception Return" for more information. The NVIC registers control interrupt handling. See "Nested Vectored Interrupt Controller (NVIC)" for more information. 12.4.1.18 Data Types The processor supports the following data types: 32-bit words 16-bit halfwords 8-bit bytes The processor manages all data memory accesses as little-endian. Instruction memory and Private Peripheral Bus (PPB) accesses are always little-endian. See "Memory Regions, Types and Attributes" for more information. 12.4.1.19 Cortex Microcontroller Software Interface Standard (CMSIS) For a Cortex-M4 microcontroller system, the Cortex Microcontroller Software Interface Standard (CMSIS) defines: A common way to: Access peripheral registers Define exception vectors The names of: The registers of the core peripherals The core exception vectors A device-independent interface for RTOS kernels, including a debug channel. The CMSIS includes address definitions and data structures for the core peripherals in the Cortex-M4 processor. The CMSIS simplifies the software development by enabling the reuse of template code and the combination of CMSIS-compliant software components from various middleware vendors. Software vendors can expand the CMSIS to include their peripheral definitions and access functions for those peripherals. This document includes the register names defined by the CMSIS, and gives short descriptions of the CMSIS functions that address the processor core and the core peripherals. Note: This document uses the register short names defined by the CMSIS. In a few cases, these differ from the architectural short names that might be used in other documents. The following sections give more information about the CMSIS: 68 Section 12.5.3 "Power Management Programming Hints" Section 12.6.2 "CMSIS Functions" Section 12.8.2.1 "NVIC Programming Hints". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.4.2 Memory Model This section describes the processor memory map, the behavior of memory accesses, and the bit-banding features. The processor has a fixed memory map that provides up to 4 GB of addressable memory. Figure 12-3. Memory Map 0xFFFFFFFF Vendor-specific 511 MB memory Private peripheral 1.0 MB bus External device 0xE0100000 0xE00FFFFF 0xE000 0000 0x DFFFFFFF 1.0 GB 0xA0000000 0x9FFFFFFF External RAM 0x43FFFFFF 1.0 GB 32 MB Bit-band alias 0x60000000 0x5FFFFFFF 0x42000000 0x400FFFFF 0x40000000 Peripheral 0.5 GB 1 MB Bit-band region 0x40000000 0x3FFFFFFF 0x23FFFFFF 32 MB Bit-band alias SRAM 0.5 GB 0x20000000 0x1FFFFFFF 0x22000000 Code 0x200FFFFF 0x20000000 1 MB Bit-band region 0.5 GB 0x00000000 The regions for SRAM and peripherals include bit-band regions. Bit-banding provides atomic operations to bit data, see "Bit-banding" . The processor reserves regions of the Private peripheral bus (PPB) address range for core peripheral registers. This memory mapping is generic to ARM Cortex-M4 products. To get the specific memory mapping of this product, refer to the Memories section of the datasheet. 12.4.2.1 Memory Regions, Types and Attributes The memory map and the programming of the MPU split the memory map into regions. Each region has a defined memory type, and some regions have additional memory attributes. The memory type and attributes determine the behavior of accesses to the region. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 69 Memory Types Normal The processor can re-order transactions for efficiency, or perform speculative reads. Device The processor preserves transaction order relative to other transactions to Device or Strongly-ordered memory. Strongly-ordered The processor preserves transaction order relative to all other transactions. The different ordering requirements for Device and Strongly-ordered memory mean that the memory system can buffer a write to Device memory, but must not buffer a write to Strongly-ordered memory. Additional Memory Attributes Shareable For a shareable memory region, the memory system provides data synchronization between bus masters in a system with multiple bus masters, for example, a processor with a DMA controller. Strongly-ordered memory is always shareable. If multiple bus masters can access a non-shareable memory region, the software must ensure data coherency between the bus masters. Execute Never (XN) Means the processor prevents instruction accesses. A fault exception is generated only on execution of an instruction executed from an XN region. 12.4.2.2 Memory System Ordering of Memory Accesses For most memory accesses caused by explicit memory access instructions, the memory system does not guarantee that the order in which the accesses complete matches the program order of the instructions, providing this does not affect the behavior of the instruction sequence. Normally, if correct program execution depends on two memory accesses completing in program order, the software must insert a memory barrier instruction between the memory access instructions, see "Software Ordering of Memory Accesses" . However, the memory system does guarantee some ordering of accesses to Device and Strongly-ordered memory. For two memory access instructions A1 and A2, if A1 occurs before A2 in program order, the ordering of the memory accesses is described below. Table 12-3. Ordering of the Memory Accesses Caused by Two Instructions A2 Device Access Normal Access Nonshareable Shareable Stronglyordered Access Normal Access - - - - Device access, non-shareable - < - < Device access, shareable - - < < Strongly-ordered access - < < < A1 Where: 12.4.2.3 - Means that the memory system does not guarantee the ordering of the accesses. < Means that accesses are observed in program order, that is, A1 is always observed before A2. Behavior of Memory Accesses The following table describes the behavior of accesses to each region in the memory map. 70 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 12-4. Memory Access Behavior Address Range Memory Region Memory Type XN 0x00000000-0x1FFFFFFF Code Normal(1) - Executable region for program code. Data can also be put here. 0x20000000-0x3FFFFFFF SRAM Normal (1) - Executable region for data. Code can also be put here. This region includes bit band and bit band alias areas, see Table 12-6. 0x40000000-0x5FFFFFFF Peripheral Device (1) XN This region includes bit band and bit band alias areas, see Table 12-6. 0x60000000-0x9FFFFFFF External RAM Normal (1) - Executable region for data XN External Device memory Stronglyordered (1) XN This region includes the NVIC, system timer, and system control block. Device (1) XN Reserved 0xA0000000-0xDFFFFFFF External device Device 0xE0000000-0xE00FFFFF Private Peripheral Bus 0xE0100000-0xFFFFFFFF Reserved Note: (1) Description 1. See "Memory Regions, Types and Attributes" for more information. The Code, SRAM, and external RAM regions can hold programs. However, ARM recommends that programs always use the Code region. This is because the processor has separate buses that enable instruction fetches and data accesses to occur simultaneously. The MPU can override the default memory access behavior described in this section. For more information, see "Memory Protection Unit (MPU)" . Additional Memory Access Constraints For Caches and Shared Memory When a system includes caches or shared memory, some memory regions have additional access constraints, and some regions are subdivided, as Table 12-5 shows. Table 12-5. Memory Region Shareability and Cache Policies Address Range Memory Region Memory Type Shareability Cache Policy (1) - WT(2) 0x00000000-0x1FFFFFFF Code Normal 0x20000000-0x3FFFFFFF SRAM Normal (1) - WBWA(2) 0x40000000-0x5FFFFFFF Peripheral Device (1) - - External RAM Normal (1) - External device Device (1) 0xE0000000-0xE00FFFFF Private Peripheral Bus Strongly-ordered(1) Shareable (1) - 0xE0100000-0xFFFFFFFF Vendor-specific device Device (1) - - 0x60000000-0x7FFFFFFF WBWA(2) WT (2) 0x80000000-0x9FFFFFFF 0xA0000000-0xBFFFFFFF 0xC0000000-0xDFFFFFFF Notes: Shareable (1) Non-shareable (1) - 1. See "Memory Regions, Types and Attributes" for more information. 2. WT = Write through, no write allocate. WBWA = Write back, write allocate. See the "Glossary" for more information. Instruction Prefetch and Branch Prediction The Cortex-M4 processor: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 71 Prefetches instructions ahead of execution Speculatively prefetches from branch target addresses. 12.4.2.4 Software Ordering of Memory Accesses The order of instructions in the program flow does not always guarantee the order of the corresponding memory transactions. This is because: The processor can reorder some memory accesses to improve efficiency, providing this does not affect the behavior of the instruction sequence. The processor has multiple bus interfaces Memory or devices in the memory map have different wait states Some memory accesses are buffered or speculative. "Memory System Ordering of Memory Accesses" describes the cases where the memory system guarantees the order of memory accesses. Otherwise, if the order of memory accesses is critical, the software must include memory barrier instructions to force that ordering. The processor provides the following memory barrier instructions: DMB The Data Memory Barrier (DMB) instruction ensures that outstanding memory transactions complete before subsequent memory transactions. See "DMB" . DSB The Data Synchronization Barrier (DSB) instruction ensures that outstanding memory transactions complete before subsequent instructions execute. See "DSB" . ISB The Instruction Synchronization Barrier (ISB) ensures that the effect of all completed memory transactions is recognizable by subsequent instructions. See "ISB" . MPU Programming Use a DSB followed by an ISB instruction or exception return to ensure that the new MPU configuration is used by subsequent instructions. 12.4.2.5 Bit-banding A bit-band region maps each word in a bit-band alias region to a single bit in the bit-band region. The bit-band regions occupy the lowest 1 MB of the SRAM and peripheral memory regions. The memory map has two 32 MB alias regions that map to two 1 MB bit-band regions: Accesses to the 32 MB SRAM alias region map to the 1 MB SRAM bit-band region, as shown in Table 12-6. Accesses to the 32 MB peripheral alias region map to the 1 MB peripheral bit-band region, as shown in Table 12-7. Table 12-6. SRAM Memory Bit-banding Regions Address Range Memory Region Instruction and Data Accesses 0x20000000-0x200FFFFF SRAM bit-band region Direct accesses to this memory range behave as SRAM memory accesses, but this region is also bit-addressable through bit-band alias. 0x22000000-0x23FFFFFF SRAM bit-band alias Data accesses to this region are remapped to bit-band region. A write operation is performed as read-modify-write. Instruction accesses are not remapped. 72 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 12-7. Peripheral Memory Bit-banding Regions Address Range Memory Region Instruction and Data Accesses 0x40000000-0x400FFFFF Peripheral bit-band alias Direct accesses to this memory range behave as peripheral memory accesses, but this region is also bit-addressable through bit-band alias. 0x42000000-0x43FFFFFF Peripheral bit-band region Data accesses to this region are remapped to bit-band region. A write operation is performed as read-modify-write. Instruction accesses are not permitted. Notes: 1. A word access to the SRAM or peripheral bit-band alias regions map to a single bit in the SRAM or peripheral bit-band region. 2. Bit-band accesses can use byte, halfword, or word transfers. The bit-band transfer size matches the transfer size of the instruction making the bit-band access. The following formula shows how the alias region maps onto the bit-band region: bit_word_offset = (byte_offset x 32) + (bit_number x 4) bit_word_addr = bit_band_base + bit_word_offset where: Bit_word_offset is the position of the target bit in the bit-band memory region. Bit_word_addr is the address of the word in the alias memory region that maps to the targeted bit. Bit_band_base is the starting address of the alias region. Byte_offset is the number of the byte in the bit-band region that contains the targeted bit. Bit_number is the bit position, 0-7, of the targeted bit. Figure 12-4 shows examples of bit-band mapping between the SRAM bit-band alias region and the SRAM bitband region: The alias word at 0x23FFFFE0 maps to bit[0] of the bit-band byte at 0x200FFFFF: 0x23FFFFE0 = 0x22000000 + (0xFFFFF*32) + (0*4). The alias word at 0x23FFFFFC maps to bit[7] of the bit-band byte at 0x200FFFFF: 0x23FFFFFC = 0x22000000 + (0xFFFFF*32) + (7*4). The alias word at 0x22000000 maps to bit[0] of the bit-band byte at 0x20000000: 0x22000000 = 0x22000000 + (0*32) + (0*4). The alias word at 0x2200001C maps to bit[7] of the bit-band byte at 0x20000000: 0x2200001C = 0x22000000+ (0*32) + (7*4). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 73 Figure 12-4. Bit-band Mapping 32 MB alias region 0x23FFFFFC 0x23FFFFF8 0x23FFFFF4 0x23FFFFF0 0x23FFFFEC 0x23FFFFE8 0x23FFFFE4 0x23FFFFE0 0x2200001C 0x22000018 0x22000014 0x22000010 0x2200000C 0x22000008 0x22000004 0x22000000 1 MB SRAM bit-band region 7 6 5 4 3 2 1 0 7 6 0x200FFFFF 7 6 5 4 3 2 5 4 3 2 1 0 7 6 0x200FFFFE 1 0 0x20000003 7 6 5 4 3 2 0x20000002 5 4 3 2 1 0 7 6 0x200FFFFD 1 0 7 6 5 4 3 2 5 4 3 2 1 0 1 0 0x200FFFFC 1 0 7 0x20000001 6 5 4 3 2 0x20000000 Directly Accessing an Alias Region Writing to a word in the alias region updates a single bit in the bit-band region. Bit[0] of the value written to a word in the alias region determines the value written to the targeted bit in the bitband region. Writing a value with bit[0] set to 1 writes a 1 to the bit-band bit, and writing a value with bit[0] set to 0 writes a 0 to the bit-band bit. Bits[31:1] of the alias word have no effect on the bit-band bit. Writing 0x01 has the same effect as writing 0xFF. Writing 0x00 has the same effect as writing 0x0E. Reading a word in the alias region: 0x00000000 indicates that the targeted bit in the bit-band region is set to 0 0x00000001 indicates that the targeted bit in the bit-band region is set to 1 Directly Accessing a Bit-band Region "Behavior of Memory Accesses" describes the behavior of direct byte, halfword, or word accesses to the bit-band regions. 12.4.2.6 Memory Endianness The processor views memory as a linear collection of bytes numbered in ascending order from zero. For example, bytes 0-3 hold the first stored word, and bytes 4-7 hold the second stored word. "Little-endian Format" describes how words of data are stored in memory. Little-endian Format In little-endian format, the processor stores the least significant byte of a word at the lowest-numbered byte, and the most significant byte at the highest-numbered byte. For example: 74 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 12-5. Little-endian Format Memory 7 Register 0 31 12.4.2.7 Address A B0 A+1 B1 A+2 B2 A+3 B3 lsbyte 24 23 B3 16 15 B2 8 7 B1 0 B0 msbyte Synchronization Primitives The Cortex-M4 instruction set includes pairs of synchronization primitives. These provide a non-blocking mechanism that a thread or process can use to obtain exclusive access to a memory location. The software can use them to perform a guaranteed read-modify-write memory update sequence, or for a semaphore mechanism. A pair of synchronization primitives comprises: A Load-exclusive Instruction, used to read the value of a memory location, requesting exclusive access to that location. A Store-Exclusive instruction, used to attempt to write to the same memory location, returning a status bit to a register. If this bit is: 0: It indicates that the thread or process gained exclusive access to the memory, and the write succeeds, 1: It indicates that the thread or process did not gain exclusive access to the memory, and no write is performed. The pairs of Load-Exclusive and Store-Exclusive instructions are: The word instructions LDREX and STREX The halfword instructions LDREXH and STREXH The byte instructions LDREXB and STREXB. The software must use a Load-Exclusive instruction with the corresponding Store-Exclusive instruction. To perform an exclusive read-modify-write of a memory location, the software must: 1. Use a Load-Exclusive instruction to read the value of the location. 2. Update the value, as required. 3. Use a Store-Exclusive instruction to attempt to write the new value back to the memory location 4. Test the returned status bit. If this bit is: 0: The read-modify-write completed successfully. 1: No write was performed. This indicates that the value returned at step 1 might be out of date. The software must retry the read-modify-write sequence. The software can use the synchronization primitives to implement a semaphore as follows: 1. Use a Load-Exclusive instruction to read from the semaphore address to check whether the semaphore is free. 2. If the semaphore is free, use a Store-Exclusive instruction to write the claim value to the semaphore address. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 75 3. If the returned status bit from step 2 indicates that the Store-Exclusive instruction succeeded then the software has claimed the semaphore. However, if the Store-Exclusive instruction failed, another process might have claimed the semaphore after the software performed the first step. The Cortex-M4 includes an exclusive access monitor, that tags the fact that the processor has executed a LoadExclusive instruction. If the processor is part of a multiprocessor system, the system also globally tags the memory locations addressed by exclusive accesses by each processor. The processor removes its exclusive access tag if: It executes a CLREX instruction It executes a Store-Exclusive instruction, regardless of whether the write succeeds. An exception occurs. This means that the processor can resolve semaphore conflicts between different threads. In a multiprocessor implementation: Executing a CLREX instruction removes only the local exclusive access tag for the processor Executing a Store-Exclusive instruction, or an exception, removes the local exclusive access tags, and all global exclusive access tags for the processor. For more information about the synchronization primitive instructions, see "LDREX and STREX" and "CLREX" . 12.4.2.8 Programming Hints for the Synchronization Primitives ISO/IEC C cannot directly generate the exclusive access instructions. CMSIS provides intrinsic functions for generation of these instructions: Table 12-8. CMSIS Functions for Exclusive Access Instructions Instruction CMSIS Function LDREX uint32_t __LDREXW (uint32_t *addr) LDREXH uint16_t __LDREXH (uint16_t *addr) LDREXB uint8_t __LDREXB (uint8_t *addr) STREX uint32_t __STREXW (uint32_t value, uint32_t *addr) STREXH uint32_t __STREXH (uint16_t value, uint16_t *addr) STREXB uint32_t __STREXB (uint8_t value, uint8_t *addr) CLREX void __CLREX (void) The actual exclusive access instruction generated depends on the data type of the pointer passed to the intrinsic function. For example, the following C code generates the required LDREXB operation: __ldrex((volatile char *) 0xFF); 12.4.3 Exception Model This section describes the exception model. 12.4.3.1 Exception States Each exception is in one of the following states: Inactive The exception is not active and not pending. Pending The exception is waiting to be serviced by the processor. 76 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 An interrupt request from a peripheral or from software can change the state of the corresponding interrupt to pending. Active An exception is being serviced by the processor but has not completed. An exception handler can interrupt the execution of another exception handler. In this case, both exceptions are in the active state. Active and Pending The exception is being serviced by the processor and there is a pending exception from the same source. 12.4.3.2 Exception Types The exception types are: Reset Reset is invoked on power up or a warm reset. The exception model treats reset as a special form of exception. When reset is asserted, the operation of the processor stops, potentially at any point in an instruction. When reset is deasserted, execution restarts from the address provided by the reset entry in the vector table. Execution restarts as privileged execution in Thread mode. Non Maskable Interrupt (NMI) A non maskable interrupt (NMI) can be signalled by a peripheral or triggered by software. This is the highest priority exception other than reset. It is permanently enabled and has a fixed priority of -2. NMIs cannot be: Masked or prevented from activation by any other exception. Preempted by any exception other than Reset. Hard Fault A hard fault is an exception that occurs because of an error during exception processing, or because an exception cannot be managed by any other exception mechanism. Hard Faults have a fixed priority of -1, meaning they have higher priority than any exception with configurable priority. Memory Management Fault (MemManage) A Memory Management Fault is an exception that occurs because of a memory protection related fault. The MPU or the fixed memory protection constraints determines this fault, for both instruction and data memory transactions. This fault is used to abort instruction accesses to Execute Never (XN) memory regions, even if the MPU is disabled. Bus Fault A Bus Fault is an exception that occurs because of a memory related fault for an instruction or data memory transaction. This might be from an error detected on a bus in the memory system. Usage Fault A Usage Fault is an exception that occurs because of a fault related to an instruction execution. This includes: An undefined instruction An illegal unaligned access An invalid state on instruction execution An error on exception return. The following can cause a Usage Fault when the core is configured to report them: An unaligned address on word and halfword memory access A division by zero. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 77 SVCall A supervisor call (SVC) is an exception that is triggered by the SVC instruction. In an OS environment, applications can use SVC instructions to access OS kernel functions and device drivers. PendSV PendSV is an interrupt-driven request for system-level service. In an OS environment, use PendSV for context switching when no other exception is active. SysTick A SysTick exception is an exception the system timer generates when it reaches zero. Software can also generate a SysTick exception. In an OS environment, the processor can use this exception as system tick. Interrupt (IRQ) A interrupt, or IRQ, is an exception signalled by a peripheral, or generated by a software request. All interrupts are asynchronous to instruction execution. In the system, peripherals use interrupts to communicate with the processor. Table 12-9. Properties of the Different Exception Types Exception Number (1) Irq Number (1) Exception Type Priority Vector Address or Offset (2) Activation 1 - Reset -3, the highest 0x00000004 Asynchronous 2 -14 NMI -2 0x00000008 Asynchronous 3 -13 Hard fault -1 0x0000000C - 4 -12 Memory management fault Configurable (3) 0x00000010 Synchronous 5 -11 Bus fault Configurable (3) 0x00000014 Synchronous when precise, asynchronous when imprecise 6 -10 Usage fault Configurable (3) 0x00000018 Synchronous 7-10 - - - Reserved - 0x0000002C Synchronous 11 -5 SVCall Configurable 12-13 - - - (3) Reserved - (3) 0x00000038 Asynchronous 0x0000003C 14 -2 PendSV Configurable 15 -1 SysTick Configurable (3) 16 and above Notes: 0 and above Interrupt (IRQ) (4) Configurable 0x00000040 and above Asynchronous (5) Asynchronous 1. To simplify the software layer, the CMSIS only uses IRQ numbers and therefore uses negative values for exceptions other than interrupts. The IPSR returns the Exception number, see "Interrupt Program Status Register" . 2. See "Vector Table" for more information 3. See "System Handler Priority Registers" 4. See "Interrupt Priority Registers" 5. Increasing in steps of 4. For an asynchronous exception, other than reset, the processor can execute another instruction between when the exception is triggered and when the processor enters the exception handler. Privileged software can disable the exceptions that Table 12-9 shows as having configurable priority, see: 78 "System Handler Control and State Register" "Interrupt Clear-enable Registers" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 For more information about hard faults, memory management faults, bus faults, and usage faults, see "Fault Handling" . 12.4.3.3 Exception Handlers The processor handles exceptions using: 12.4.3.4 Interrupt Service Routines (ISRs) Interrupts IRQ0 to IRQ34 are the exceptions handled by ISRs. Fault Handlers Hard fault, memory management fault, usage fault, bus fault are fault exceptions handled by the fault handlers. System Handlers NMI, PendSV, SVCall SysTick, and the fault exceptions are all system exceptions that are handled by system handlers. Vector Table The vector table contains the reset value of the stack pointer, and the start addresses, also called exception vectors, for all exception handlers. Figure 12-6 shows the order of the exception vectors in the vector table. The least-significant bit of each vector must be 1, indicating that the exception handler is Thumb code. Figure 12-6. Vector Table Exception number IRQ number 255 239 . . . 18 2 17 1 16 0 15 -1 14 -2 13 Offset 0x03FC . . . 0x004C 0x0048 0x0044 0x0040 0x003C 0x0038 12 11 Vector IRQ239 . . . IRQ2 IRQ1 IRQ0 SysTick PendSV Reserved Reserved for Debug -5 10 0x002C 9 SVCall Reserved 8 7 6 -10 5 -11 4 -12 3 -13 2 -14 1 0x0018 0x0014 0x0010 0x000C 0x0008 0x0004 0x0000 Usage fault Bus fault Memory management fault Hard fault NMI Reset Initial SP value On system reset, the vector table is fixed at address 0x00000000. Privileged software can write to the SCB_VTOR to relocate the vector table start address to a different memory location, in the range 0x00000080 to 0x3FFFFF80, see "Vector Table Offset Register" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 79 12.4.3.5 Exception Priorities As Table 12-9 shows, all exceptions have an associated priority, with: A lower priority value indicating a higher priority Configurable priorities for all exceptions except Reset, Hard fault and NMI. If the software does not configure any priorities, then all exceptions with a configurable priority have a priority of 0. For information about configuring exception priorities see "System Handler Priority Registers" , and "Interrupt Priority Registers" . Note: Configurable priority values are in the range 0-15. This means that the Reset, Hard fault, and NMI exceptions, with fixed negative priority values, always have higher priority than any other exception. For example, assigning a higher priority value to IRQ[0] and a lower priority value to IRQ[1] means that IRQ[1] has higher priority than IRQ[0]. If both IRQ[1] and IRQ[0] are asserted, IRQ[1] is processed before IRQ[0]. If multiple pending exceptions have the same priority, the pending exception with the lowest exception number takes precedence. For example, if both IRQ[0] and IRQ[1] are pending and have the same priority, then IRQ[0] is processed before IRQ[1]. When the processor is executing an exception handler, the exception handler is preempted if a higher priority exception occurs. If an exception occurs with the same priority as the exception being handled, the handler is not preempted, irrespective of the exception number. However, the status of the new interrupt changes to pending. 12.4.3.6 Interrupt Priority Grouping To increase priority control in systems with interrupts, the NVIC supports priority grouping. This divides each interrupt priority register entry into two fields: An upper field that defines the group priority A lower field that defines a subpriority within the group. Only the group priority determines preemption of interrupt exceptions. When the processor is executing an interrupt exception handler, another interrupt with the same group priority as the interrupt being handled does not preempt the handler. If multiple pending interrupts have the same group priority, the subpriority field determines the order in which they are processed. If multiple pending interrupts have the same group priority and subpriority, the interrupt with the lowest IRQ number is processed first. For information about splitting the interrupt priority fields into group priority and subpriority, see "Application Interrupt and Reset Control Register" . 12.4.3.7 Exception Entry and Return Descriptions of exception handling use the following terms: Preemption When the processor is executing an exception handler, an exception can preempt the exception handler if its priority is higher than the priority of the exception being handled. See "Interrupt Priority Grouping" for more information about preemption by an interrupt. When one exception preempts another, the exceptions are called nested exceptions. See "Exception Entry" more information. Return This occurs when the exception handler is completed, and: There is no pending exception with sufficient priority to be serviced The completed exception handler was not handling a late-arriving exception. The processor pops the stack and restores the processor state to the state it had before the interrupt occurred. See "Exception Return" for more information. 80 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Tail-chaining This mechanism speeds up exception servicing. On completion of an exception handler, if there is a pending exception that meets the requirements for exception entry, the stack pop is skipped and control transfers to the new exception handler. Late-arriving This mechanism speeds up preemption. If a higher priority exception occurs during state saving for a previous exception, the processor switches to handle the higher priority exception and initiates the vector fetch for that exception. State saving is not affected by late arrival because the state saved is the same for both exceptions. Therefore the state saving continues uninterrupted. The processor can accept a late arriving exception until the first instruction of the exception handler of the original exception enters the execute stage of the processor. On return from the exception handler of the late-arriving exception, the normal tail-chaining rules apply. Exception Entry An Exception entry occurs when there is a pending exception with sufficient priority and either the processor is in Thread mode, or the new exception is of a higher priority than the exception being handled, in which case the new exception preempts the original exception. When one exception preempts another, the exceptions are nested. Sufficient priority means that the exception has more priority than any limits set by the mask registers, see "Exception Mask Registers" . An exception with less priority than this is pending but is not handled by the processor. When the processor takes an exception, unless the exception is a tail-chained or a late-arriving exception, the processor pushes information onto the current stack. This operation is referred as stacking and the structure of eight data words is referred to as stack frame. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 81 Figure 12-7. Exception Stack Frame ... {aligner} FPSCR S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S4 S3 S2 S1 S0 xPSR PC LR R12 R3 R2 R1 R0 Pre-IRQ top of stack Decreasing memory address IRQ top of stack Exception frame with floating-point storage ... {aligner} xPSR PC LR R12 R3 R2 R1 R0 Pre-IRQ top of stack IRQ top of stack Exception frame without floating-point storage Immediately after stacking, the stack pointer indicates the lowest address in the stack frame. The alignment of the stack frame is controlled via the STKALIGN bit of the Configuration Control Register (CCR). The stack frame includes the return address. This is the address of the next instruction in the interrupted program. This value is restored to the PC at exception return so that the interrupted program resumes. In parallel to the stacking operation, the processor performs a vector fetch that reads the exception handler start address from the vector table. When stacking is complete, the processor starts executing the exception handler. At the same time, the processor writes an EXC_RETURN value to the LR. This indicates which stack pointer corresponds to the stack frame and what operation mode the processor was in before the entry occurred. If no higher priority exception occurs during the exception entry, the processor starts executing the exception handler and automatically changes the status of the corresponding pending interrupt to active. If another higher priority exception occurs during the exception entry, the processor starts executing the exception handler for this exception and does not change the pending status of the earlier exception. This is the late arrival case. Exception Return An Exception return occurs when the processor is in Handler mode and executes one of the following instructions to load the EXC_RETURN value into the PC: 82 An LDM or POP instruction that loads the PC An LDR instruction with the PC as the destination. A BX instruction using any register. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 EXC_RETURN is the value loaded into the LR on exception entry. The exception mechanism relies on this value to detect when the processor has completed an exception handler. The lowest five bits of this value provide information on the return stack and processor mode. Table 12-10 shows the EXC_RETURN values with a description of the exception return behavior. All EXC_RETURN values have bits[31:5] set to one. When this value is loaded into the PC, it indicates to the processor that the exception is complete, and the processor initiates the appropriate exception return sequence. Table 12-10. Exception Return Behavior EXC_RETURN[31:0] Description 0xFFFFFFF1 Return to Handler mode, exception return uses non-floating-point state from the MSP and execution uses MSP after return. 0xFFFFFFF9 Return to Thread mode, exception return uses non-floating-point state from MSP and execution uses MSP after return. 0xFFFFFFFD Return to Thread mode, exception return uses non-floating-point state from the PSP and execution uses PSP after return. 12.4.3.8 Fault Handling Faults are a subset of the exceptions, see "Exception Model" . The following generate a fault: A bus error on: An instruction fetch or vector table load A data access An internally-detected error such as an undefined instruction An attempt to execute an instruction from a memory region marked as Non-Executable (XN). A privilege violation or an attempt to access an unmanaged region causing an MPU fault. Fault Types Table 12-11 shows the types of fault, the handler used for the fault, the corresponding fault status register, and the register bit that indicates that the fault has occurred. See "Configurable Fault Status Register" for more information about the fault status registers. Table 12-11. Faults Fault Handler Bus error on a vector read Bit Name VECTTBL Hard fault "Hard Fault Status Register" Fault escalated to a hard fault FORCED MPU or default memory map mismatch: - during exception stacking - IACCVIOL (1) on instruction access on data access Fault Status Register Memory management fault DACCVIOL(2) MSTKERR during exception unstacking MUNSTKERR during lazy floating-point state preservation MLSPERR(3) "MMFSR: Memory Management Fault Status Subregister" SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 83 Table 12-11. Faults (Continued) Fault Handler Bus error: Bit Name Fault Status Register - - during exception stacking STKERR during exception unstacking UNSTKERR during instruction prefetch Bus fault IBUSERR LSPERR(3) during lazy floating-point state preservation Precise data bus error PRECISERR Imprecise data bus error IMPRECISERR Attempt to access a coprocessor NOCP Undefined instruction UNDEFINSTR Attempt to enter an invalid instruction set state "BFSR: Bus Fault Status Subregister" INVSTATE Usage fault "UFSR: Usage Fault Status Subregister" Invalid EXC_RETURN value INVPC Illegal unaligned load or store UNALIGNED Divide By 0 DIVBYZERO Notes: 1. Occurs on an access to an XN region even if the processor does not include an MPU or the MPU is disabled. 2. Attempt to use an instruction set other than the Thumb instruction set, or return to a non load/store-multiple instruction with ICI continuation. 3. Only present in a Cortex-M4F device Fault Escalation and Hard Faults All faults exceptions except for hard fault have configurable exception priority, see "System Handler Priority Registers" . The software can disable the execution of the handlers for these faults, see "System Handler Control and State Register" . Usually, the exception priority, together with the values of the exception mask registers, determines whether the processor enters the fault handler, and whether a fault handler can preempt another fault handler, as described in "Exception Model" . In some situations, a fault with configurable priority is treated as a hard fault. This is called priority escalation, and the fault is described as escalated to hard fault. Escalation to hard fault occurs when: A fault handler causes the same kind of fault as the one it is servicing. This escalation to hard fault occurs because a fault handler cannot preempt itself; it must have the same priority as the current priority level. A fault handler causes a fault with the same or lower priority as the fault it is servicing. This is because the handler for the new fault cannot preempt the currently executing fault handler. An exception handler causes a fault for which the priority is the same as or lower than the currently executing exception. A fault occurs and the handler for that fault is not enabled. If a bus fault occurs during a stack push when entering a bus fault handler, the bus fault does not escalate to a hard fault. This means that if a corrupted stack causes a fault, the fault handler executes even though the stack push for the handler failed. The fault handler operates but the stack contents are corrupted. Note: Only Reset and NMI can preempt the fixed priority hard fault. A hard fault can preempt any exception other than Reset, NMI, or another hard fault. Fault Status Registers and Fault Address Registers The fault status registers indicate the cause of a fault. For bus faults and memory management faults, the fault address register indicates the address accessed by the operation that caused the fault, as shown in Table 12-12. 84 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 12-12. Fault Status and Fault Address Registers Handler Status Register Name Address Register Name Register Description Hard fault SCB_HFSR - "Hard Fault Status Register" Memory management fault MMFSR SCB_MMFAR Bus fault BFSR SCB_BFAR Usage fault UFSR - "MMFSR: Memory Management Fault Status Subregister" "MemManage Fault Address Register" "BFSR: Bus Fault Status Subregister" "Bus Fault Address Register" "UFSR: Usage Fault Status Subregister" Lockup The processor enters a lockup state if a hard fault occurs when executing the NMI or hard fault handlers. When the processor is in lockup state, it does not execute any instructions. The processor remains in lockup state until either: It is reset An NMI occurs It is halted by a debugger. Note: If the lockup state occurs from the NMI handler, a subsequent NMI does not cause the processor to leave the lockup state. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 85 12.5 Power Management The Cortex-M4 processor sleep modes reduce the power consumption: Sleep mode stops the processor clock Deep sleep mode stops the system clock and switches off the PLL and flash memory. The SLEEPDEEP bit of the SCR selects which sleep mode is used; see "System Control Register" . This section describes the mechanisms for entering sleep mode, and the conditions for waking up from sleep mode. 12.5.1 Entering Sleep Mode This section describes the mechanisms software can use to put the processor into sleep mode. The system can generate spurious wakeup events, for example a debug operation wakes up the processor. Therefore, the software must be able to put the processor back into sleep mode after such an event. A program might have an idle loop to put the processor back to sleep mode. 12.5.1.1 Wait for Interrupt The wait for interrupt instruction, WFI, causes immediate entry to sleep mode. When the processor executes a WFI instruction it stops executing instructions and enters sleep mode. See "WFI" for more information. 12.5.1.2 Wait for Event The wait for event instruction, WFE, causes entry to sleep mode conditional on the value of an one-bit event register. When the processor executes a WFE instruction, it checks this register: If the register is 0, the processor stops executing instructions and enters sleep mode If the register is 1, the processor clears the register to 0 and continues executing instructions without entering sleep mode. See "WFE" for more information. 12.5.1.3 Sleep-on-exit If the SLEEPONEXIT bit of the SCR is set to 1 when the processor completes the execution of an exception handler, it returns to Thread mode and immediately enters sleep mode. Use this mechanism in applications that only require the processor to run when an exception occurs. 12.5.2 Wakeup from Sleep Mode The conditions for the processor to wake up depend on the mechanism that cause it to enter sleep mode. 12.5.2.1 Wakeup from WFI or Sleep-on-exit Normally, the processor wakes up only when it detects an exception with sufficient priority to cause exception entry. Some embedded systems might have to execute system restore tasks after the processor wakes up, and before it executes an interrupt handler. To achieve this, set the PRIMASK bit to 1 and the FAULTMASK bit to 0. If an interrupt arrives that is enabled and has a higher priority than the current exception priority, the processor wakes up but does not execute the interrupt handler until the processor sets PRIMASK to zero. For more information about PRIMASK and FAULTMASK, see "Exception Mask Registers" . 12.5.2.2 Wakeup from WFE The processor wakes up if: 86 It detects an exception with sufficient priority to cause an exception entry It detects an external event signal. See "External Event Input" In a multiprocessor system, another processor in the system executes an SEV instruction. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 In addition, if the SEVONPEND bit in the SCR is set to 1, any new pending interrupt triggers an event and wakes up the processor, even if the interrupt is disabled or has insufficient priority to cause an exception entry. For more information about the SCR, see "System Control Register" . 12.5.2.3 External Event Input The processor provides an external event input signal. Peripherals can drive this signal, either to wake the processor from WFE, or to set the internal WFE event register to 1 to indicate that the processor must not enter sleep mode on a later WFE instruction. See "Wait for Event" for more information. 12.5.3 Power Management Programming Hints ISO/IEC C cannot directly generate the WFI and WFE instructions. The CMSIS provides the following functions for these instructions: void __WFE(void) // Wait for Event void __WFI(void) // Wait for Interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 87 12.6 Cortex-M4 Instruction Set 12.6.1 Instruction Set Summary The processor implements a version of the Thumb instruction set. Table 12-13 lists the supported instructions. Angle brackets, <>, enclose alternative forms of the operand Braces, {}, enclose optional operands The Operands column is not exhaustive Op2 is a flexible second operand that can be either a register or a constant Most instructions can use an optional condition code suffix. For more information on the instructions and operands, see the instruction descriptions. Table 12-13. Cortex-M4 Instructions Mnemonic Operands Description Flags ADC, ADCS {Rd,} Rn, Op2 Add with Carry N,Z,C,V ADD, ADDS {Rd,} Rn, Op2 Add N,Z,C,V ADD, ADDW {Rd,} Rn, #imm12 Add N,Z,C,V ADR Rd, label Load PC-relative address - AND, ANDS {Rd,} Rn, Op2 Logical AND N,Z,C ASR, ASRS Rd, Rm, <Rs|#n> Arithmetic Shift Right N,Z,C B label Branch - BFC Rd, #lsb, #width Bit Field Clear - BFI Rd, Rn, #lsb, #width Bit Field Insert - BIC, BICS {Rd,} Rn, Op2 Bit Clear N,Z,C BKPT #imm Breakpoint - BL label Branch with Link - BLX Rm Branch indirect with Link - BX Rm Branch indirect - CBNZ Rn, label Compare and Branch if Non Zero - CBZ Rn, label Compare and Branch if Zero - CLREX - Clear Exclusive - CLZ Rd, Rm Count leading zeros - CMN Rn, Op2 Compare Negative N,Z,C,V CMP Rn, Op2 Compare N,Z,C,V CPSID i Change Processor State, Disable Interrupts - CPSIE i Change Processor State, Enable Interrupts - DMB - Data Memory Barrier - DSB - Data Synchronization Barrier - EOR, EORS {Rd,} Rn, Op2 Exclusive OR N,Z,C ISB - Instruction Synchronization Barrier - IT - If-Then condition block - LDM Rn{!}, reglist Load Multiple registers, increment after - 88 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 12-13. Cortex-M4 Instructions (Continued) Mnemonic Operands Description Flags LDMDB, LDMEA Rn{!}, reglist Load Multiple registers, decrement before - LDMFD, LDMIA Rn{!}, reglist Load Multiple registers, increment after - LDR Rt, [Rn, #offset] Load Register with word - LDRB, LDRBT Rt, [Rn, #offset] Load Register with byte - LDRD Rt, Rt2, [Rn, #offset] Load Register with two bytes - LDREX Rt, [Rn, #offset] Load Register Exclusive - LDREXB Rt, [Rn] Load Register Exclusive with byte - LDREXH Rt, [Rn] Load Register Exclusive with halfword - LDRH, LDRHT Rt, [Rn, #offset] Load Register with halfword - LDRSB, DRSBT Rt, [Rn, #offset] Load Register with signed byte - LDRSH, LDRSHT Rt, [Rn, #offset] Load Register with signed halfword - LDRT Rt, [Rn, #offset] Load Register with word - LSL, LSLS Rd, Rm, <Rs|#n> Logical Shift Left N,Z,C LSR, LSRS Rd, Rm, <Rs|#n> Logical Shift Right N,Z,C MLA Rd, Rn, Rm, Ra Multiply with Accumulate, 32-bit result - MLS Rd, Rn, Rm, Ra Multiply and Subtract, 32-bit result - MOV, MOVS Rd, Op2 Move N,Z,C MOVT Rd, #imm16 Move Top - MOVW, MOV Rd, #imm16 Move 16-bit constant N,Z,C MRS Rd, spec_reg Move from special register to general register - MSR spec_reg, Rm Move from general register to special register N,Z,C,V MUL, MULS {Rd,} Rn, Rm Multiply, 32-bit result N,Z MVN, MVNS Rd, Op2 Move NOT N,Z,C NOP - No Operation - ORN, ORNS {Rd,} Rn, Op2 Logical OR NOT N,Z,C ORR, ORRS {Rd,} Rn, Op2 Logical OR N,Z,C PKHTB, PKHBT {Rd,} Rn, Rm, Op2 Pack Halfword - POP reglist Pop registers from stack - PUSH reglist Push registers onto stack - QADD {Rd,} Rn, Rm Saturating double and Add Q QADD16 {Rd,} Rn, Rm Saturating Add 16 - QADD8 {Rd,} Rn, Rm Saturating Add 8 - QASX {Rd,} Rn, Rm Saturating Add and Subtract with Exchange - QDADD {Rd,} Rn, Rm Saturating Add Q QDSUB {Rd,} Rn, Rm Saturating double and Subtract Q QSAX {Rd,} Rn, Rm Saturating Subtract and Add with Exchange - QSUB {Rd,} Rn, Rm Saturating Subtract Q SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 89 Table 12-13. Cortex-M4 Instructions (Continued) Mnemonic Operands Description Flags QSUB16 {Rd,} Rn, Rm Saturating Subtract 16 - QSUB8 {Rd,} Rn, Rm Saturating Subtract 8 - RBIT Rd, Rn Reverse Bits - REV Rd, Rn Reverse byte order in a word - REV16 Rd, Rn Reverse byte order in each halfword - REVSH Rd, Rn Reverse byte order in bottom halfword and sign extend - ROR, RORS Rd, Rm, <Rs|#n> Rotate Right N,Z,C RRX, RRXS Rd, Rm Rotate Right with Extend N,Z,C RSB, RSBS {Rd,} Rn, Op2 Reverse Subtract N,Z,C,V SADD16 {Rd,} Rn, Rm Signed Add 16 GE SADD8 {Rd,} Rn, Rm Signed Add 8 and Subtract with Exchange GE SASX {Rd,} Rn, Rm Signed Add GE SBC, SBCS {Rd,} Rn, Op2 Subtract with Carry N,Z,C,V SBFX Rd, Rn, #lsb, #width Signed Bit Field Extract - SDIV {Rd,} Rn, Rm Signed Divide - SEL {Rd,} Rn, Rm Select bytes - SEV - Send Event - SHADD16 {Rd,} Rn, Rm Signed Halving Add 16 - SHADD8 {Rd,} Rn, Rm Signed Halving Add 8 - SHASX {Rd,} Rn, Rm Signed Halving Add and Subtract with Exchange - SHSAX {Rd,} Rn, Rm Signed Halving Subtract and Add with Exchange - SHSUB16 {Rd,} Rn, Rm Signed Halving Subtract 16 - SHSUB8 {Rd,} Rn, Rm Signed Halving Subtract 8 - SMLABB, SMLABT, SMLATB, SMLATT Rd, Rn, Rm, Ra Signed Multiply Accumulate Long (halfwords) Q SMLAD, SMLADX Rd, Rn, Rm, Ra Signed Multiply Accumulate Dual Q SMLAL RdLo, RdHi, Rn, Rm Signed Multiply with Accumulate (32 x 32 + 64), 64-bit result - SMLALBB, SMLALBT, SMLALTB, SMLALTT RdLo, RdHi, Rn, Rm Signed Multiply Accumulate Long, halfwords - SMLALD, SMLALDX RdLo, RdHi, Rn, Rm Signed Multiply Accumulate Long Dual - SMLAWB, SMLAWT Rd, Rn, Rm, Ra Signed Multiply Accumulate, word by halfword Q SMLSD Rd, Rn, Rm, Ra Signed Multiply Subtract Dual Q SMLSLD RdLo, RdHi, Rn, Rm Signed Multiply Subtract Long Dual SMMLA Rd, Rn, Rm, Ra Signed Most significant word Multiply Accumulate - SMMLS, SMMLR Rd, Rn, Rm, Ra Signed Most significant word Multiply Subtract - SMMUL, SMMULR {Rd,} Rn, Rm Signed Most significant word Multiply - SMUAD {Rd,} Rn, Rm Signed dual Multiply Add Q 90 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 12-13. Cortex-M4 Instructions (Continued) Mnemonic Operands Description Flags SMULBB, SMULBT SMULTB, SMULTT {Rd,} Rn, Rm Signed Multiply (halfwords) - SMULL RdLo, RdHi, Rn, Rm Signed Multiply (32 x 32), 64-bit result - SMULWB, SMULWT {Rd,} Rn, Rm Signed Multiply word by halfword - SMUSD, SMUSDX {Rd,} Rn, Rm Signed dual Multiply Subtract - SSAT Rd, #n, Rm {,shift #s} Signed Saturate Q SSAT16 Rd, #n, Rm Signed Saturate 16 Q SSAX {Rd,} Rn, Rm Signed Subtract and Add with Exchange GE SSUB16 {Rd,} Rn, Rm Signed Subtract 16 - SSUB8 {Rd,} Rn, Rm Signed Subtract 8 - STM Rn{!}, reglist Store Multiple registers, increment after - STMDB, STMEA Rn{!}, reglist Store Multiple registers, decrement before - STMFD, STMIA Rn{!}, reglist Store Multiple registers, increment after - STR Rt, [Rn, #offset] Store Register word - STRB, STRBT Rt, [Rn, #offset] Store Register byte - STRD Rt, Rt2, [Rn, #offset] Store Register two words - STREX Rd, Rt, [Rn, #offset] Store Register Exclusive - STREXB Rd, Rt, [Rn] Store Register Exclusive byte - STREXH Rd, Rt, [Rn] Store Register Exclusive halfword - STRH, STRHT Rt, [Rn, #offset] Store Register halfword - STRT Rt, [Rn, #offset] Store Register word - SUB, SUBS {Rd,} Rn, Op2 Subtract N,Z,C,V SUB, SUBW {Rd,} Rn, #imm12 Subtract N,Z,C,V SVC #imm Supervisor Call - SXTAB {Rd,} Rn, Rm,{,ROR #} Extend 8 bits to 32 and add - SXTAB16 {Rd,} Rn, Rm,{,ROR #} Dual extend 8 bits to 16 and add - SXTAH {Rd,} Rn, Rm,{,ROR #} Extend 16 bits to 32 and add - SXTB16 {Rd,} Rm {,ROR #n} Signed Extend Byte 16 - SXTB {Rd,} Rm {,ROR #n} Sign extend a byte - SXTH {Rd,} Rm {,ROR #n} Sign extend a halfword - TBB [Rn, Rm] Table Branch Byte - TBH [Rn, Rm, LSL #1] Table Branch Halfword - TEQ Rn, Op2 Test Equivalence N,Z,C TST Rn, Op2 Test N,Z,C UADD16 {Rd,} Rn, Rm Unsigned Add 16 GE UADD8 {Rd,} Rn, Rm Unsigned Add 8 GE USAX {Rd,} Rn, Rm Unsigned Subtract and Add with Exchange GE SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 91 Table 12-13. Cortex-M4 Instructions (Continued) Mnemonic Operands Description Flags UHADD16 {Rd,} Rn, Rm Unsigned Halving Add 16 - UHADD8 {Rd,} Rn, Rm Unsigned Halving Add 8 - UHASX {Rd,} Rn, Rm Unsigned Halving Add and Subtract with Exchange - UHSAX {Rd,} Rn, Rm Unsigned Halving Subtract and Add with Exchange - UHSUB16 {Rd,} Rn, Rm Unsigned Halving Subtract 16 - UHSUB8 {Rd,} Rn, Rm Unsigned Halving Subtract 8 - UBFX Rd, Rn, #lsb, #width Unsigned Bit Field Extract - UDIV {Rd,} Rn, Rm Unsigned Divide - UMAAL RdLo, RdHi, Rn, Rm Unsigned Multiply Accumulate Accumulate Long (32 x 32 + 32 + 32), 64-bit result - UMLAL RdLo, RdHi, Rn, Rm Unsigned Multiply with Accumulate (32 x 32 + 64), 64-bit result - UMULL RdLo, RdHi, Rn, Rm Unsigned Multiply (32 x 32), 64-bit result - UQADD16 {Rd,} Rn, Rm Unsigned Saturating Add 16 - UQADD8 {Rd,} Rn, Rm Unsigned Saturating Add 8 - UQASX {Rd,} Rn, Rm Unsigned Saturating Add and Subtract with Exchange - UQSAX {Rd,} Rn, Rm Unsigned Saturating Subtract and Add with Exchange - UQSUB16 {Rd,} Rn, Rm Unsigned Saturating Subtract 16 - UQSUB8 {Rd,} Rn, Rm Unsigned Saturating Subtract 8 - USAD8 {Rd,} Rn, Rm Unsigned Sum of Absolute Differences - USADA8 {Rd,} Rn, Rm, Ra Unsigned Sum of Absolute Differences and Accumulate - USAT Rd, #n, Rm {,shift #s} Unsigned Saturate Q USAT16 Rd, #n, Rm Unsigned Saturate 16 Q UASX {Rd,} Rn, Rm Unsigned Add and Subtract with Exchange GE USUB16 {Rd,} Rn, Rm Unsigned Subtract 16 GE USUB8 {Rd,} Rn, Rm Unsigned Subtract 8 GE UXTAB {Rd,} Rn, Rm,{,ROR #} Rotate, extend 8 bits to 32 and Add - UXTAB16 {Rd,} Rn, Rm,{,ROR #} Rotate, dual extend 8 bits to 16 and Add - UXTAH {Rd,} Rn, Rm,{,ROR #} Rotate, unsigned extend and Add Halfword - UXTB {Rd,} Rm {,ROR #n} Zero extend a byte - UXTB16 {Rd,} Rm {,ROR #n} Unsigned Extend Byte 16 - UXTH {Rd,} Rm {,ROR #n} Zero extend a halfword - VABS.F32 Sd, Sm Floating-point Absolute - VADD.F32 {Sd,} Sn, Sm Floating-point Add - VCMP.F32 Sd, <Sm | #0.0> Compare two floating-point registers, or one floating-point register and zero FPSCR VCMPE.F32 Sd, <Sm | #0.0> Compare two floating-point registers, or one floating-point register and zero with Invalid Operation check FPSCR VCVT.S32.F32 Sd, Sm Convert between floating-point and integer - 92 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 12-13. Cortex-M4 Instructions (Continued) Mnemonic Operands Description Flags VCVT.S16.F32 Sd, Sd, #fbits Convert between floating-point and fixed point - VCVTR.S32.F32 Sd, Sm Convert between floating-point and integer with rounding - VCVT<B|H>.F32.F16 Sd, Sm Converts half-precision value to single-precision - VCVTT<B|T>.F32.F16 Sd, Sm Converts single-precision register to half-precision - VDIV.F32 {Sd,} Sn, Sm Floating-point Divide - VFMA.F32 {Sd,} Sn, Sm Floating-point Fused Multiply Accumulate - VFNMA.F32 {Sd,} Sn, Sm Floating-point Fused Negate Multiply Accumulate - VFMS.F32 {Sd,} Sn, Sm Floating-point Fused Multiply Subtract - VFNMS.F32 {Sd,} Sn, Sm Floating-point Fused Negate Multiply Subtract - VLDM.F<32|64> Rn{!}, list Load Multiple extension registers - VLDR.F<32|64> <Dd|Sd>, [Rn] Load an extension register from memory - VLMA.F32 {Sd,} Sn, Sm Floating-point Multiply Accumulate - VLMS.F32 {Sd,} Sn, Sm Floating-point Multiply Subtract - VMOV.F32 Sd, #imm Floating-point Move immediate - VMOV Sd, Sm Floating-point Move register - VMOV Sn, Rt Copy ARM core register to single precision - VMOV Sm, Sm1, Rt, Rt2 Copy 2 ARM core registers to 2 single precision - VMOV Dd[x], Rt Copy ARM core register to scalar - VMOV Rt, Dn[x] Copy scalar to ARM core register - VMRS Rt, FPSCR Move FPSCR to ARM core register or APSR N,Z,C,V VMSR FPSCR, Rt Move to FPSCR from ARM Core register FPSCR VMUL.F32 {Sd,} Sn, Sm Floating-point Multiply - VNEG.F32 Sd, Sm Floating-point Negate - VNMLA.F32 Sd, Sn, Sm Floating-point Multiply and Add - VNMLS.F32 Sd, Sn, Sm Floating-point Multiply and Subtract - VNMUL {Sd,} Sn, Sm Floating-point Multiply - VPOP list Pop extension registers - VPUSH list Push extension registers - VSQRT.F32 Sd, Sm Calculates floating-point Square Root - VSTM Rn{!}, list Floating-point register Store Multiple - VSTR.F<32|64> Sd, [Rn] Stores an extension register to memory - VSUB.F<32|64> {Sd,} Sn, Sm Floating-point Subtract - WFE - Wait For Event - WFI - Wait For Interrupt - 12.6.2 CMSIS Functions ISO/IEC cannot directly access some Cortex-M4 instructions. This section describes intrinsic functions that can generate these instructions, provided by the CMIS and that might be provided by a C compiler. If a C compiler SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 93 does not support an appropriate intrinsic function, the user might have to use inline assembler to access some instructions. The CMSIS provides the following intrinsic functions to generate instructions that ISO/IEC C code cannot directly access: Table 12-14. CMSIS Functions to Generate some Cortex-M4 Instructions Instruction CMSIS Function CPSIE I void __enable_irq(void) CPSID I void __disable_irq(void) CPSIE F void __enable_fault_irq(void) CPSID F void __disable_fault_irq(void) ISB void __ISB(void) DSB void __DSB(void) DMB void __DMB(void) REV uint32_t __REV(uint32_t int value) REV16 uint32_t __REV16(uint32_t int value) REVSH uint32_t __REVSH(uint32_t int value) RBIT uint32_t __RBIT(uint32_t int value) SEV void __SEV(void) WFE void __WFE(void) WFI void __WFI(void) The CMSIS also provides a number of functions for accessing the special registers using MRS and MSR instructions: Table 12-15. CMSIS Intrinsic Functions to Access the Special Registers Special Register Access CMSIS Function Read uint32_t __get_PRIMASK (void) Write void __set_PRIMASK (uint32_t value) Read uint32_t __get_FAULTMASK (void Write void __set_FAULTMASK (uint32_t value) Read uint32_t __get_BASEPRI (void) Write void __set_BASEPRI (uint32_t value) Read uint32_t __get_CONTROL (void) Write void __set_CONTROL (uint32_t value) Read uint32_t __get_MSP (void) Write void __set_MSP (uint32_t TopOfMainStack) Read uint32_t __get_PSP (void) Write void __set_PSP (uint32_t TopOfProcStack) PRIMASK FAULTMASK BASEPRI CONTROL MSP PSP 94 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.3 Instruction Descriptions 12.6.3.1 Operands An instruction operand can be an ARM register, a constant, or another instruction-specific parameter. Instructions act on the operands and often store the result in a destination register. When there is a destination register in the instruction, it is usually specified before the operands. Operands in some instructions are flexible, can either be a register or a constant. See "Flexible Second Operand" . 12.6.3.2 Restrictions when Using PC or SP Many instructions have restrictions on whether the Program Counter (PC) or Stack Pointer (SP) for the operands or destination register can be used. See instruction descriptions for more information. Note: 12.6.3.3 Bit[0] of any address written to the PC with a BX, BLX, LDM, LDR, or POP instruction must be 1 for correct execution, because this bit indicates the required instruction set, and the Cortex-M4 processor only supports Thumb instructions. Flexible Second Operand Many general data processing instructions have a flexible second operand. This is shown as Operand2 in the descriptions of the syntax of each instruction. Operand2 can be a: "Constant" "Register with Optional Shift" Constant Specify an Operand2 constant in the form: #constant where constant can be: Any constant that can be produced by shifting an 8-bit value left by any number of bits within a 32-bit word Any constant of the form 0x00XY00XY Any constant of the form 0xXY00XY00 Any constant of the form 0xXYXYXYXY. Note: In the constants shown above, X and Y are hexadecimal digits. In addition, in a small number of instructions, constant can take a wider range of values. These are described in the individual instruction descriptions. When an Operand2 constant is used with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to bit[31] of the constant, if the constant is greater than 255 and can be produced by shifting an 8-bit value. These instructions do not affect the carry flag if Operand2 is any other constant. Instruction Substitution The assembler might be able to produce an equivalent instruction in cases where the user specifies a constant that is not permitted. For example, an assembler might assemble the instruction CMP Rd, #0xFFFFFFFE as the equivalent instruction CMN Rd, #0x2. Register with Optional Shift Specify an Operand2 register in the form: Rm {, shift} where: Rm is the register holding the data for the second operand. shift is an optional shift to be applied to Rm. It can be one of: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 95 ASR #n arithmetic shift right n bits, 1 n 32. LSL #n logical shift left n bits, 1 n 31. LSR #n logical shift right n bits, 1 n 32. ROR #n rotate right n bits, 1 n 31. RRX rotate right one bit, with extend. - if omitted, no shift occurs, equivalent to LSL #0. If the user omits the shift, or specifies LSL #0, the instruction uses the value in Rm. If the user specifies a shift, the shift is applied to the value in Rm, and the resulting 32-bit value is used by the instruction. However, the contents in the register Rm remains unchanged. Specifying a register with shift also updates the carry flag when used with certain instructions. For information on the shift operations and how they affect the carry flag, see "Flexible Second Operand" . 12.6.3.4 Shift Operations Register shift operations move the bits in a register left or right by a specified number of bits, the shift length. Register shift can be performed: Directly by the instructions ASR, LSR, LSL, ROR, and RRX, and the result is written to a destination register During the calculation of Operand2 by the instructions that specify the second operand as a register with shift. See "Flexible Second Operand" . The result is used by the instruction. The permitted shift lengths depend on the shift type and the instruction. If the shift length is 0, no shift occurs. Register shift operations update the carry flag except when the specified shift length is 0. The following subsections describe the various shift operations and how they affect the carry flag. In these descriptions, Rm is the register containing the value to be shifted, and n is the shift length. ASR Arithmetic shift right by n bits moves the left-hand 32-n bits of the register, Rm, to the right by n places, into the right-hand 32-n bits of the result. And it copies the original bit[31] of the register into the left-hand n bits of the result. See Figure 12-8. The ASR #n operation can be used to divide the value in the register Rm by 2n, with the result being rounded towards negative-infinity. When the instruction is ASRS or when ASR #n is used in Operand2 with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to the last bit shifted out, bit[n-1], of the register Rm. If n is 32 or more, then all the bits in the result are set to the value of bit[31] of Rm. If n is 32 or more and the carry flag is updated, it is updated to the value of bit[31] of Rm. Figure 12-8. ASR #3 &DUU\ )ODJ LSR Logical shift right by n bits moves the left-hand 32-n bits of the register Rm, to the right by n places, into the righthand 32-n bits of the result. And it sets the left-hand n bits of the result to 0. See Figure 12-9. 96 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The LSR #n operation can be used to divide the value in the register Rm by 2n, if the value is regarded as an unsigned integer. When the instruction is LSRS or when LSR #n is used in Operand2 with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to the last bit shifted out, bit[n-1], of the register Rm. If n is 32 or more, then all the bits in the result are cleared to 0. If n is 33 or more and the carry flag is updated, it is updated to 0. Figure 12-9. LSR #3 &DUU\ )ODJ LSL Logical shift left by n bits moves the right-hand 32-n bits of the register Rm, to the left by n places, into the left-hand 32-n bits of the result; and it sets the right-hand n bits of the result to 0. See Figure 12-10. The LSL #n operation can be used to multiply the value in the register Rm by 2n, if the value is regarded as an unsigned integer or a two's complement signed integer. Overflow can occur without warning. When the instruction is LSLS or when LSL #n, with non-zero n, is used in Operand2 with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to the last bit shifted out, bit[32n], of the register Rm. These instructions do not affect the carry flag when used with LSL #0. If n is 32 or more, then all the bits in the result are cleared to 0. If n is 33 or more and the carry flag is updated, it is updated to 0. Figure 12-10. LSL #3 &DUU\ )ODJ ROR Rotate right by n bits moves the left-hand 32-n bits of the register Rm, to the right by n places, into the right-hand 32-n bits of the result; and it moves the right-hand n bits of the register into the left-hand n bits of the result. See Figure 12-11. When the instruction is RORS or when ROR #n is used in Operand2 with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to the last bit rotation, bit[n-1], of the register Rm. If n is 32, then the value of the result is same as the value in Rm, and if the carry flag is updated, it is updated to bit[31] of Rm. ROR with shift length, n, more than 32 is the same as ROR with shift length n-32. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 97 Figure 12-11. ROR #3 &DUU\ )ODJ RRX Rotate right with extend moves the bits of the register Rm to the right by one bit; and it copies the carry flag into bit[31] of the result. See Figure 12-12. When the instruction is RRXS or when RRX is used in Operand2 with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to bit[0] of the register Rm. Figure 12-12. RRX &DUU\ )ODJ 12.6.3.5 Address Alignment An aligned access is an operation where a word-aligned address is used for a word, dual word, or multiple word access, or where a halfword-aligned address is used for a halfword access. Byte accesses are always aligned. The Cortex-M4 processor supports unaligned access only for the following instructions: LDR, LDRT LDRH, LDRHT LDRSH, LDRSHT STR, STRT STRH, STRHT All other load and store instructions generate a usage fault exception if they perform an unaligned access, and therefore their accesses must be address-aligned. For more information about usage faults, see "Fault Handling" . Unaligned accesses are usually slower than aligned accesses. In addition, some memory regions might not support unaligned accesses. Therefore, ARM recommends that programmers ensure that accesses are aligned. To avoid accidental generation of unaligned accesses, use the UNALIGN_TRP bit in the Configuration and Control Register to trap all unaligned accesses, see "Configuration and Control Register" . 12.6.3.6 PC-relative Expressions A PC-relative expression or label is a symbol that represents the address of an instruction or literal data. It is represented in the instruction as the PC value plus or minus a numeric offset. The assembler calculates the required offset from the label and the address of the current instruction. If the offset is too big, the assembler produces an error. 98 For B, BL, CBNZ, and CBZ instructions, the value of the PC is the address of the current instruction plus 4 bytes. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 For all other instructions that use labels, the value of the PC is the address of the current instruction plus 4 bytes, with bit[1] of the result cleared to 0 to make it word-aligned. Your assembler might permit other syntaxes for PC-relative expressions, such as a label plus or minus a number, or an expression of the form [PC, #number]. 12.6.3.7 Conditional Execution Most data processing instructions can optionally update the condition flags in the Application Program Status Register (APSR) according to the result of the operation, see "Application Program Status Register" . Some instructions update all flags, and some only update a subset. If a flag is not updated, the original value is preserved. See the instruction descriptions for the flags they affect. An instruction can be executed conditionally, based on the condition flags set in another instruction, either: Immediately after the instruction that updated the flags After any number of intervening instructions that have not updated the flags. Conditional execution is available by using conditional branches or by adding condition code suffixes to instructions. See Table 12-16 for a list of the suffixes to add to instructions to make them conditional instructions. The condition code suffix enables the processor to test a condition based on the flags. If the condition test of a conditional instruction fails, the instruction: Does not execute Does not write any value to its destination register Does not affect any of the flags Does not generate any exception. Conditional instructions, except for conditional branches, must be inside an If-Then instruction block. See "IT" for more information and restrictions when using the IT instruction. Depending on the vendor, the assembler might automatically insert an IT instruction if there are conditional instructions outside the IT block. The CBZ and CBNZ instructions are used to compare the value of a register against zero and branch on the result. This section describes: "Condition Flags" "Condition Code Suffixes" . Condition Flags The APSR contains the following condition flags: N Set to 1 when the result of the operation was negative, cleared to 0 otherwise. Z Set to 1 when the result of the operation was zero, cleared to 0 otherwise. C Set to 1 when the operation resulted in a carry, cleared to 0 otherwise. V Set to 1 when the operation caused overflow, cleared to 0 otherwise. For more information about the APSR, see "Program Status Register" . A carry occurs: If the result of an addition is greater than or equal to 232 If the result of a subtraction is positive or zero As the result of an inline barrel shifter operation in a move or logical instruction. An overflow occurs when the sign of the result, in bit[31], does not match the sign of the result, had the operation been performed at infinite precision, for example: If adding two negative values results in a positive value If adding two positive values results in a negative value If subtracting a positive value from a negative value generates a positive value SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 99 If subtracting a negative value from a positive value generates a negative value. The Compare operations are identical to subtracting, for CMP, or adding, for CMN, except that the result is discarded. See the instruction descriptions for more information. Note: Most instructions update the status flags only if the S suffix is specified. See the instruction descriptions for more information. Condition Code Suffixes The instructions that can be conditional have an optional condition code, shown in syntax descriptions as {cond}. Conditional execution requires a preceding IT instruction. An instruction with a condition code is only executed if the condition code flags in the APSR meet the specified condition. Table 12-16 shows the condition codes to use. A conditional execution can be used with the IT instruction to reduce the number of branch instructions in code. Table 12-16 also shows the relationship between condition code suffixes and the N, Z, C, and V flags. Table 12-16. Condition Code Suffixes Suffix Flags Meaning EQ Z=1 Equal NE Z=0 Not equal CS or HS C=1 Higher or same, unsigned CC or LO C=0 Lower, unsigned < MI N=1 Negative PL N=0 Positive or zero VS V=1 Overflow VC V=0 No overflow HI C = 1 and Z = 0 Higher, unsigned > LS C = 0 or Z = 1 Lower or same, unsigned GE N=V Greater than or equal, signed LT N != V Less than, signed < GT Z = 0 and N = V Greater than, signed > LE Z = 1 and N != V Less than or equal, signed AL Can have any value Always. This is the default when no suffix is specified. Absolute Value The example below shows the use of a conditional instruction to find the absolute value of a number. R0 = ABS(R1). MOVS R0, R1 ; R0 = R1, setting flags IT MI ; IT instruction for the negative condition RSBMI R0, R1, #0 ; If negative, R0 = -R1 Compare and Update Value The example below shows the use of conditional instructions to update the value of R4 if the signed values R0 is greater than R1 and R2 is greater than R3. CMP R0, R1 ; Compare R0 and R1, setting flags ITT GT ; IT instruction for the two GT conditions CMPGT R2, R3 ; If 'greater than', compare R2 and R3, setting flags MOVGT R4, R5 ; If still 'greater than', do R4 = R5 100 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.3.8 Instruction Width Selection There are many instructions that can generate either a 16-bit encoding or a 32-bit encoding depending on the operands and destination register specified. For some of these instructions, the user can force a specific instruction size by using an instruction width suffix. The .W suffix forces a 32-bit instruction encoding. The .N suffix forces a 16-bit instruction encoding. If the user specifies an instruction width suffix and the assembler cannot generate an instruction encoding of the requested width, it generates an error. Note: In some cases, it might be necessary to specify the .W suffix, for example if the operand is the label of an instruction or literal data, as in the case of branch instructions. This is because the assembler might not automatically generate the right size encoding. To use an instruction width suffix, place it immediately after the instruction mnemonic and condition code, if any. The example below shows instructions with the instruction width suffix. BCS.W label ; creates a 32-bit instruction even for a short ; branch ADDS.W R0, R0, R1 ; creates a 32-bit instruction even though the same ; operation can be done by a 16-bit instruction SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 101 12.6.4 Memory Access Instructions The table below shows the memory access instructions. Table 12-17. 102 Memory Access Instructions Mnemonic Description ADR Load PC-relative address CLREX Clear Exclusive LDM{mode} Load Multiple registers LDR{type} Load Register using immediate offset LDR{type} Load Register using register offset LDR{type}T Load Register with unprivileged access LDR Load Register using PC-relative address LDRD Load Register Dual LDREX{type} Load Register Exclusive POP Pop registers from stack PUSH Push registers onto stack STM{mode} Store Multiple registers STR{type} Store Register using immediate offset STR{type} Store Register using register offset STR{type}T Store Register with unprivileged access STREX{type} Store Register Exclusive SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.4.1 ADR Load PC-relative address. Syntax ADR{cond} Rd, label where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. label is a PC-relative expression. See "PC-relative Expressions" . Operation ADR determines the address by adding an immediate value to the PC, and writes the result to the destination register. ADR produces position-independent code, because the address is PC-relative. If ADR is used to generate a target address for a BX or BLX instruction, ensure that bit[0] of the address generated is set to 1 for correct execution. Values of label must be within the range of -4095 to +4095 from the address in the PC. Note: The user might have to use the .W suffix to get the maximum offset range or to generate addresses that are not wordaligned. See "Instruction Width Selection" . Restrictions Rd must not be SP and must not be PC. Condition Flags This instruction does not change the flags. Examples ADR R1, TextMessage ; Write address value of a location labelled as ; TextMessage to R1 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 103 12.6.4.2 LDR and STR, Immediate Offset Load and Store with immediate offset, pre-indexed immediate offset, or post-indexed immediate offset. Syntax op{type}{cond} Rt, op{type}{cond} Rt, op{type}{cond} Rt, opD{cond} Rt, Rt2, opD{cond} Rt, Rt2, opD{cond} Rt, Rt2, [Rn {, #offset}] [Rn, #offset]! [Rn], #offset [Rn {, #offset}] [Rn, #offset]! [Rn], #offset ; ; ; ; ; ; immediate offset pre-indexed post-indexed immediate offset, two words pre-indexed, two words post-indexed, two words where: op is one of: LDR Load Register. STR Store Register. type is one of: B unsigned byte, zero extend to 32 bits on loads. SB signed byte, sign extend to 32 bits (LDR only). H unsigned halfword, zero extend to 32 bits on loads. SH signed halfword, sign extend to 32 bits (LDR only). - omit, for word. cond is an optional condition code, see "Conditional Execution" . Rt is the register to load or store. Rn is the register on which the memory address is based. offset is an offset from Rn. If offset is omitted, the address is the contents of Rn. Rt2 is the additional register to load or store for two-word operations. Operation LDR instructions load one or two registers with a value from memory. STR instructions store one or two register values to memory. Load and store instructions with immediate offset can use the following addressing modes: Offset Addressing The offset value is added to or subtracted from the address obtained from the register Rn. The result is used as the address for the memory access. The register Rn is unaltered. The assembly language syntax for this mode is: [Rn, #offset] 104 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Pre-indexed Addressing The offset value is added to or subtracted from the address obtained from the register Rn. The result is used as the address for the memory access and written back into the register Rn. The assembly language syntax for this mode is: [Rn, #offset]! Post-indexed Addressing The address obtained from the register Rn is used as the address for the memory access. The offset value is added to or subtracted from the address, and written back into the register Rn. The assembly language syntax for this mode is: [Rn], #offset The value to load or store can be a byte, halfword, word, or two words. Bytes and halfwords can either be signed or unsigned. See "Address Alignment" . The table below shows the ranges of offset for immediate, pre-indexed and post-indexed forms. Table 12-18. Offset Ranges Instruction Type Immediate Offset Pre-indexed Post-indexed Word, halfword, signed halfword, byte, or signed byte -255 to 4095 -255 to 255 -255 to 255 Two words multiple of 4 in the range -1020 to 1020 multiple of 4 in the range -1020 to 1020 multiple of 4 in the range -1020 to 1020 Restrictions For load instructions: Rt can be SP or PC for word loads only Rt must be different from Rt2 for two-word loads Rn must be different from Rt and Rt2 in the pre-indexed or post-indexed forms. When Rt is PC in a word load instruction: Bit[0] of the loaded value must be 1 for correct execution A branch occurs to the address created by changing bit[0] of the loaded value to 0 If the instruction is conditional, it must be the last instruction in the IT block. For store instructions: Rt can be SP for word stores only Rt must not be PC Rn must not be PC Rn must be different from Rt and Rt2 in the pre-indexed or post-indexed forms. Condition Flags These instructions do not change the flags. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 105 Examples LDR LDRNE R8, [R10] R2, [R5, #960]! STR R2, [R9,#const-struc] STRH R3, [R4], #4 LDRD R8, R9, [R3, #0x20] STRD R0, R1, [R8], #-16 12.6.4.3 ; ; ; ; ; ; ; ; ; ; ; ; ; ; Loads R8 from the address in R10. Loads (conditionally) R2 from a word 960 bytes above the address in R5, and increments R5 by 960. const-struc is an expression evaluating to a constant in the range 0-4095. Store R3 as halfword data into address in R4, then increment R4 by 4 Load R8 from a word 32 bytes above the address in R3, and load R9 from a word 36 bytes above the address in R3 Store R0 to address in R8, and store R1 to a word 4 bytes above the address in R8, and then decrement R8 by 16. LDR and STR, Register Offset Load and Store with register offset. Syntax op{type}{cond} Rt, [Rn, Rm {, LSL #n}] where: op is one of: LDR Load Register. STR Store Register. type is one of: B unsigned byte, zero extend to 32 bits on loads. SB signed byte, sign extend to 32 bits (LDR only). H unsigned halfword, zero extend to 32 bits on loads. SH signed halfword, sign extend to 32 bits (LDR only). - omit, for word. cond is an optional condition code, see "Conditional Execution" . Rt is the register to load or store. Rn is the register on which the memory address is based. Rm is a register containing a value to be used as the offset. LSL #n is an optional shift, with n in the range 0 to 3. Operation LDR instructions load a register with a value from memory. STR instructions store a register value into memory. The memory address to load from or store to is at an offset from the register Rn. The offset is specified by the register Rm and can be shifted left by up to 3 bits using LSL. The value to load or store can be a byte, halfword, or word. For load instructions, bytes and halfwords can either be signed or unsigned. See "Address Alignment" . Restrictions In these instructions: 106 Rn must not be PC SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Rm must not be SP and must not be PC Rt can be SP only for word loads and word stores Rt can be PC only for word loads. When Rt is PC in a word load instruction: Bit[0] of the loaded value must be 1 for correct execution, and a branch occurs to this halfword-aligned address If the instruction is conditional, it must be the last instruction in the IT block. Condition Flags These instructions do not change the flags. Examples STR LDRSB STR R0, [R5, R1] ; ; R0, [R5, R1, LSL #1] ; ; ; R0, [R1, R2, LSL #2] ; ; Store value of R0 into an address equal to sum of R5 and R1 Read byte value from an address equal to sum of R5 and two times R1, sign extended it to a word value and put it in R0 Stores R0 to an address equal to sum of R1 and four times R2 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 107 12.6.4.4 LDR and STR, Unprivileged Load and Store with unprivileged access. Syntax op{type}T{cond} Rt, [Rn {, #offset}] ; immediate offset where: op is one of: LDR Load Register. STR Store Register. type is one of: B unsigned byte, zero extend to 32 bits on loads. SB signed byte, sign extend to 32 bits (LDR only). H unsigned halfword, zero extend to 32 bits on loads. SH signed halfword, sign extend to 32 bits (LDR only). - omit, for word. cond is an optional condition code, see "Conditional Execution" . Rt is the register to load or store. Rn is the register on which the memory address is based. offset is an offset from Rn and can be 0 to 255. If offset is omitted, the address is the value in Rn. Operation These load and store instructions perform the same function as the memory access instructions with immediate offset, see "LDR and STR, Immediate Offset" . The difference is that these instructions have only unprivileged access even when used in privileged software. When used in unprivileged software, these instructions behave in exactly the same way as normal memory access instructions with immediate offset. Restrictions In these instructions: Rn must not be PC Rt must not be SP and must not be PC. Condition Flags These instructions do not change the flags. Examples 108 STRBTEQ R4, [R7] LDRHT R2, [R2, #8] ; ; ; ; Conditionally store least significant byte in R4 to an address in R7, with unprivileged access Load halfword value from an address equal to sum of R2 and 8 into R2, with unprivileged access SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.4.5 LDR, PC-relative Load register from memory. Syntax LDR{type}{cond} Rt, label LDRD{cond} Rt, Rt2, label ; Load two words where: type is one of: B unsigned byte, zero extend to 32 bits. SB signed byte, sign extend to 32 bits. H unsigned halfword, zero extend to 32 bits. SH signed halfword, sign extend to 32 bits. - omit, for word. cond is an optional condition code, see "Conditional Execution" . Rt is the register to load or store. Rt2 is the second register to load or store. label is a PC-relative expression. See "PC-relative Expressions" . Operation LDR loads a register with a value from a PC-relative memory address. The memory address is specified by a label or by an offset from the PC. The value to load or store can be a byte, halfword, or word. For load instructions, bytes and halfwords can either be signed or unsigned. See "Address Alignment" . label must be within a limited range of the current instruction. The table below shows the possible offsets between label and the PC. Table 12-19. Offset Ranges Instruction Type Offset Range Word, halfword, signed halfword, byte, signed byte -4095 to 4095 Two words -1020 to 1020 The user might have to use the .W suffix to get the maximum offset range. See "Instruction Width Selection" . Restrictions In these instructions: Rt can be SP or PC only for word loads Rt2 must not be SP and must not be PC Rt must be different from Rt2. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 109 When Rt is PC in a word load instruction: Bit[0] of the loaded value must be 1 for correct execution, and a branch occurs to this halfword-aligned address If the instruction is conditional, it must be the last instruction in the IT block. Condition Flags These instructions do not change the flags. Examples LDR R0, LookUpTable LDRSB R7, localdata 12.6.4.6 ; ; ; ; ; Load R0 with a word of data from an address labelled as LookUpTable Load a byte value from an address labelled as localdata, sign extend it to a word value, and put it in R7 LDM and STM Load and Store Multiple registers. Syntax op{addr_mode}{cond} Rn{!}, reglist where: op is one of: LDM Load Multiple registers. STM Store Multiple registers. addr_mode is any one of the following: IA Increment address After each access. This is the default. DB Decrement address Before each access. cond is an optional condition code, see "Conditional Execution" . Rn is the register on which the memory addresses are based. ! is an optional writeback suffix. If ! is present, the final address, that is loaded from or stored to, is written back into Rn. reglist is a list of one or more registers to be loaded or stored, enclosed in braces. It can contain register ranges. It must be comma separated if it contains more than one register or register range, see "Examples" . LDM and LDMFD are synonyms for LDMIA. LDMFD refers to its use for popping data from Full Descending stacks. LDMEA is a synonym for LDMDB, and refers to its use for popping data from Empty Ascending stacks. STM and STMEA are synonyms for STMIA. STMEA refers to its use for pushing data onto Empty Ascending stacks. STMFD is s synonym for STMDB, and refers to its use for pushing data onto Full Descending stacks Operation LDM instructions load the registers in reglist with word values from memory addresses based on Rn. STM instructions store the word values in the registers in reglist to memory addresses based on Rn. For LDM, LDMIA, LDMFD, STM, STMIA, and STMEA the memory addresses used for the accesses are at 4-byte intervals ranging from Rn to Rn + 4 * (n-1), where n is the number of registers in reglist. The accesses happens in order of increasing register numbers, with the lowest numbered register using the lowest memory address and the 110 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 highest number register using the highest memory address. If the writeback suffix is specified, the value of Rn + 4 * (n-1) is written back to Rn. For LDMDB, LDMEA, STMDB, and STMFD the memory addresses used for the accesses are at 4-byte intervals ranging from Rn to Rn - 4 * (n-1), where n is the number of registers in reglist. The accesses happen in order of decreasing register numbers, with the highest numbered register using the highest memory address and the lowest number register using the lowest memory address. If the writeback suffix is specified, the value of Rn - 4 * (n-1) is written back to Rn. The PUSH and POP instructions can be expressed in this form. See "PUSH and POP" for details. Restrictions In these instructions: Rn must not be PC reglist must not contain SP In any STM instruction, reglist must not contain PC In any LDM instruction, reglist must not contain PC if it contains LR reglist must not contain Rn if the writeback suffix is specified. When PC is in reglist in an LDM instruction: Bit[0] of the value loaded to the PC must be 1 for correct execution, and a branch occurs to this halfwordaligned address If the instruction is conditional, it must be the last instruction in the IT block. Condition Flags These instructions do not change the flags. Examples LDM STMDB R8,{R0,R2,R9} ; LDMIA is a synonym for LDM R1!,{R3-R6,R11,R12} Incorrect Examples STM LDM R5!,{R5,R4,R9} ; Value stored for R5 is unpredictable R2, {} ; There must be at least one register in the list SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 111 12.6.4.7 PUSH and POP Push registers onto, and pop registers off a full-descending stack. Syntax PUSH{cond} reglist POP{cond} reglist where: cond is an optional condition code, see "Conditional Execution" . reglist is a non-empty list of registers, enclosed in braces. It can contain register ranges. It must be comma separated if it contains more than one register or register range. PUSH and POP are synonyms for STMDB and LDM (or LDMIA) with the memory addresses for the access based on SP, and with the final address for the access written back to the SP. PUSH and POP are the preferred mnemonics in these cases. Operation PUSH stores registers on the stack in order of decreasing the register numbers, with the highest numbered register using the highest memory address and the lowest numbered register using the lowest memory address. POP loads registers from the stack in order of increasing register numbers, with the lowest numbered register using the lowest memory address and the highest numbered register using the highest memory address. See "LDM and STM" for more information. Restrictions In these instructions: reglist must not contain SP For the PUSH instruction, reglist must not contain PC For the POP instruction, reglist must not contain PC if it contains LR. When PC is in reglist in a POP instruction: Bit[0] of the value loaded to the PC must be 1 for correct execution, and a branch occurs to this halfwordaligned address If the instruction is conditional, it must be the last instruction in the IT block. Condition Flags These instructions do not change the flags. Examples PUSH PUSH POP 112 {R0,R4-R7} {R2,LR} {R0,R10,PC} SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.4.8 LDREX and STREX Load and Store Register Exclusive. Syntax LDREX{cond} Rt, [Rn {, #offset}] STREX{cond} Rd, Rt, [Rn {, #offset}] LDREXB{cond} Rt, [Rn] STREXB{cond} Rd, Rt, [Rn] LDREXH{cond} Rt, [Rn] STREXH{cond} Rd, Rt, [Rn] where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register for the returned status. Rt is the register to load or store. Rn is the register on which the memory address is based. offset is an optional offset applied to the value in Rn. If offset is omitted, the address is the value in Rn. Operation LDREX, LDREXB, and LDREXH load a word, byte, and halfword respectively from a memory address. STREX, STREXB, and STREXH attempt to store a word, byte, and halfword respectively to a memory address. The address used in any Store-Exclusive instruction must be the same as the address in the most recently executed Load-exclusive instruction. The value stored by the Store-Exclusive instruction must also have the same data size as the value loaded by the preceding Load-exclusive instruction. This means software must always use a Load-exclusive instruction and a matching Store-Exclusive instruction to perform a synchronization operation, see "Synchronization Primitives" . If an Store-Exclusive instruction performs the store, it writes 0 to its destination register. If it does not perform the store, it writes 1 to its destination register. If the Store-Exclusive instruction writes 0 to the destination register, it is guaranteed that no other process in the system has accessed the memory location between the Load-exclusive and Store-Exclusive instructions. For reasons of performance, keep the number of instructions between corresponding Load-Exclusive and StoreExclusive instruction to a minimum. The result of executing a Store-Exclusive instruction to an address that is different from that used in the preceding Load-Exclusive instruction is unpredictable. Restrictions In these instructions: Do not use PC Do not use SP for Rd and Rt For STREX, Rd must be different from both Rt and Rn The value of offset must be a multiple of four in the range 0-1020. Condition Flags These instructions do not change the flags. Examples MOV LDREX CMP R1, #0x1 R0, [LockAddr] R0, #0 ; Initialize the `lock taken' value try ; Load the lock value ; Is the lock free? SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 113 ITT STREXEQ CMPEQ BNE .... 12.6.4.9 EQ R0, R1, [LockAddr] R0, #0 try ; ; ; ; ; IT instruction for STREXEQ and CMPEQ Try and claim the lock Did this succeed? No - try again Yes - we have the lock CLREX Clear Exclusive. Syntax CLREX{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation Use CLREX to make the next STREX, STREXB, or STREXH instruction write a 1 to its destination register and fail to perform the store. It is useful in exception handler code to force the failure of the store exclusive if the exception occurs between a load exclusive instruction and the matching store exclusive instruction in a synchronization operation. See "Synchronization Primitives" for more information. Condition Flags These instructions do not change the flags. Examples CLREX 114 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.5 General Data Processing Instructions The table below shows the data processing instructions. Table 12-20. Data Processing Instructions Mnemonic Description ADC Add with Carry ADD Add ADDW Add AND Logical AND ASR Arithmetic Shift Right BIC Bit Clear CLZ Count leading zeros CMN Compare Negative CMP Compare EOR Exclusive OR LSL Logical Shift Left LSR Logical Shift Right MOV Move MOVT Move Top MOVW Move 16-bit constant MVN Move NOT ORN Logical OR NOT ORR Logical OR RBIT Reverse Bits REV Reverse byte order in a word REV16 Reverse byte order in each halfword REVSH Reverse byte order in bottom halfword and sign extend ROR Rotate Right RRX Rotate Right with Extend RSB Reverse Subtract SADD16 Signed Add 16 SADD8 Signed Add 8 SASX Signed Add and Subtract with Exchange SSAX Signed Subtract and Add with Exchange SBC Subtract with Carry SHADD16 Signed Halving Add 16 SHADD8 Signed Halving Add 8 SHASX Signed Halving Add and Subtract with Exchange SHSAX Signed Halving Subtract and Add with Exchange SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 115 Table 12-20. 116 Data Processing Instructions (Continued) Mnemonic Description SHSUB16 Signed Halving Subtract 16 SHSUB8 Signed Halving Subtract 8 SSUB16 Signed Subtract 16 SSUB8 Signed Subtract 8 SUB Subtract SUBW Subtract TEQ Test Equivalence TST Test UADD16 Unsigned Add 16 UADD8 Unsigned Add 8 UASX Unsigned Add and Subtract with Exchange USAX Unsigned Subtract and Add with Exchange UHADD16 Unsigned Halving Add 16 UHADD8 Unsigned Halving Add 8 UHASX Unsigned Halving Add and Subtract with Exchange UHSAX Unsigned Halving Subtract and Add with Exchange UHSUB16 Unsigned Halving Subtract 16 UHSUB8 Unsigned Halving Subtract 8 USAD8 Unsigned Sum of Absolute Differences USADA8 Unsigned Sum of Absolute Differences and Accumulate USUB16 Unsigned Subtract 16 USUB8 Unsigned Subtract 8 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.5.1 ADD, ADC, SUB, SBC, and RSB Add, Add with carry, Subtract, Subtract with carry, and Reverse Subtract. Syntax op{S}{cond} {Rd,} Rn, Operand2 op{cond} {Rd,} Rn, #imm12 ; ADD and SUB only where: op is one of: ADD Add. ADC Add with Carry. SUB Subtract. SBC Subtract with Carry. RSB Reverse Subtract. S is an optional suffix. If S is specified, the condition code flags are updated on the result of the operation, see "Conditional Execution" . cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. If Rd is omitted, the destination register is Rn. Rn is the register holding the first operand. Operand2 is a flexible second operand. See "Flexible Second Operand" for details of the options. imm12 is any value in the range 0-4095. Operation The ADD instruction adds the value of Operand2 or imm12 to the value in Rn. The ADC instruction adds the values in Rn and Operand2, together with the carry flag. The SUB instruction subtracts the value of Operand2 or imm12 from the value in Rn. The SBC instruction subtracts the value of Operand2 from the value in Rn. If the carry flag is clear, the result is reduced by one. The RSB instruction subtracts the value in Rn from the value of Operand2. This is useful because of the wide range of options for Operand2. Use ADC and SBC to synthesize multiword arithmetic, see Multiword arithmetic examples on. See also "ADR" . Note: ADDW is equivalent to the ADD syntax that uses the imm12 operand. SUBW is equivalent to the SUB syntax that uses the imm12 operand. Restrictions In these instructions: Operand2 must not be SP and must not be PC Rd can be SP only in ADD and SUB, and only with the additional restrictions: Rn must also be SP Any shift in Operand2 must be limited to a maximum of 3 bits using LSL Rn can be SP only in ADD and SUB Rd can be PC only in the ADD{cond} PC, PC, Rm instruction where: The user must not specify the S suffix Rm must not be PC and must not be SP SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 117 If the instruction is conditional, it must be the last instruction in the IT block With the exception of the ADD{cond} PC, PC, Rm instruction, Rn can be PC only in ADD and SUB, and only with the additional restrictions: The user must not specify the S suffix The second operand must be a constant in the range 0 to 4095. Note: When using the PC for an addition or a subtraction, bits[1:0] of the PC are rounded to 0b00 before performing the calculation, making the base address for the calculation word-aligned. Note: To generate the address of an instruction, the constant based on the value of the PC must be adjusted. ARM recommends to use the ADR instruction instead of ADD or SUB with Rn equal to the PC, because the assembler automatically calculates the correct constant for the ADR instruction. When Rd is PC in the ADD{cond} PC, PC, Rm instruction: Bit[0] of the value written to the PC is ignored A branch occurs to the address created by forcing bit[0] of that value to 0. Condition Flags If S is specified, these instructions update the N, Z, C and V flags according to the result. Examples ADD SUBS RSB ADCHI R2, R1, R3 R8, R6, #240 R4, R4, #1280 R11, R0, R3 ; ; ; ; Sets the flags on the result Subtracts contents of R4 from 1280 Only executed if C flag set and Z flag clear. Multiword Arithmetic Examples The example below shows two instructions that add a 64-bit integer contained in R2 and R3 to another 64-bit integer contained in R0 and R1, and place the result in R4 and R5. 64-bit Addition Example ADDS R4, R0, R2 ADC R5, R1, R3 ; add the least significant words ; add the most significant words with carry Multiword values do not have to use consecutive registers. The example below shows instructions that subtract a 96-bit integer contained in R9, R1, and R11 from another contained in R6, R2, and R8. The example stores the result in R6, R9, and R2. 96-bit Subtraction Example SUBS R6, R6, R9 SBCS R9, R2, R1 SBC R2, R8, R11 12.6.5.2 ; subtract the least significant words ; subtract the middle words with carry ; subtract the most significant words with carry AND, ORR, EOR, BIC, and ORN Logical AND, OR, Exclusive OR, Bit Clear, and OR NOT. Syntax op{S}{cond} {Rd,} Rn, Operand2 where: op is one of: AND logical AND. ORR logical OR, or bit set. EOR logical Exclusive OR. BIC logical AND NOT, or bit clear. ORN logical OR NOT. 118 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 S is an optional suffix. If S is specified, the condition code flags are updated on the result of the operation, see "Conditional Execution" . cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the register holding the first operand. Operand2 is a flexible second operand. See "Flexible Second Operand" for details of the options. Operation The AND, EOR, and ORR instructions perform bitwise AND, Exclusive OR, and OR operations on the values in Rn and Operand2. The BIC instruction performs an AND operation on the bits in Rn with the complements of the corresponding bits in the value of Operand2. The ORN instruction performs an OR operation on the bits in Rn with the complements of the corresponding bits in the value of Operand2. Restrictions Do not use SP and do not use PC. Condition Flags If S is specified, these instructions: Update the N and Z flags according to the result Can update the C flag during the calculation of Operand2, see "Flexible Second Operand" Do not affect the V flag. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 119 Examples AND ORREQ ANDS EORS BIC ORN ORNS 12.6.5.3 R9, R2, #0xFF00 R2, R0, R5 R9, R8, #0x19 R7, R11, #0x18181818 R0, R1, #0xab R7, R11, R14, ROR #4 R7, R11, R14, ASR #32 ASR, LSL, LSR, ROR, and RRX Arithmetic Shift Right, Logical Shift Left, Logical Shift Right, Rotate Right, and Rotate Right with Extend. Syntax op{S}{cond} Rd, Rm, Rs op{S}{cond} Rd, Rm, #n RRX{S}{cond} Rd, Rm where: op is one of: ASR Arithmetic Shift Right. LSL Logical Shift Left. LSR Logical Shift Right. ROR Rotate Right. S is an optional suffix. If S is specified, the condition code flags are updated on the result of the operation, see "Conditional Execution" . Rd is the destination register. Rm is the register holding the value to be shifted. Rs is the register holding the shift length to apply to the value in Rm. Only the least significant byte is used and can be in the range 0 to 255. n is the shift length. The range of shift length depends on the instruction: ASR shift length from 1 to 32 LSL shift length from 0 to 31 LSR shift length from 1 to 32 ROR shift length from 0 to 31 MOVS Rd, Rm is the preferred syntax for LSLS Rd, Rm, #0. Operation ASR, LSL, LSR, and ROR move the bits in the register Rm to the left or right by the number of places specified by constant n or register Rs. RRX moves the bits in register Rm to the right by 1. In all these instructions, the result is written to Rd, but the value in register Rm remains unchanged. For details on what result is generated by the different instructions, see "Shift Operations" . Restrictions Do not use SP and do not use PC. Condition Flags 120 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 If S is specified: These instructions update the N and Z flags according to the result The C flag is updated to the last bit shifted out, except when the shift length is 0, see "Shift Operations" . Examples ASR SLS LSR ROR RRX 12.6.5.4 R7, R1, R4, R4, R4, R8, R2, R5, R5, R5 #9 #3 #6 R6 ; ; ; ; ; Arithmetic shift right by 9 bits Logical shift left by 3 bits with flag update Logical shift right by 6 bits Rotate right by the value in the bottom byte of R6 Rotate right with extend. CLZ Count Leading Zeros. Syntax CLZ{cond} Rd, Rm where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rm is the operand register. Operation The CLZ instruction counts the number of leading zeros in the value in Rm and returns the result in Rd. The result value is 32 if no bits are set and zero if bit[31] is set. Restrictions Do not use SP and do not use PC. Condition Flags This instruction does not change the flags. Examples CLZ CLZNE R4,R9 R2,R3 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 121 12.6.5.5 CMP and CMN Compare and Compare Negative. Syntax CMP{cond} Rn, Operand2 CMN{cond} Rn, Operand2 where: cond is an optional condition code, see "Conditional Execution" . Rn is the register holding the first operand. Operand2 is a flexible second operand. See "Flexible Second Operand" for details of the options. Operation These instructions compare the value in a register with Operand2. They update the condition flags on the result, but do not write the result to a register. The CMP instruction subtracts the value of Operand2 from the value in Rn. This is the same as a SUBS instruction, except that the result is discarded. The CMN instruction adds the value of Operand2 to the value in Rn. This is the same as an ADDS instruction, except that the result is discarded. Restrictions In these instructions: Do not use PC Operand2 must not be SP. Condition Flags These instructions update the N, Z, C and V flags according to the result. Examples CMP CMN CMPGT 122 R2, R9 R0, #6400 SP, R7, LSL #2 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.5.6 MOV and MVN Move and Move NOT. Syntax MOV{S}{cond} Rd, Operand2 MOV{cond} Rd, #imm16 MVN{S}{cond} Rd, Operand2 where: S is an optional suffix. If S is specified, the condition code flags are updated on the result of the operation, see "Conditional Execution" . cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Operand2 is a flexible second operand. See "Flexible Second Operand" for details of the options. imm16 is any value in the range 0-65535. Operation The MOV instruction copies the value of Operand2 into Rd. When Operand2 in a MOV instruction is a register with a shift other than LSL #0, the preferred syntax is the corresponding shift instruction: ASR{S}{cond} Rd, Rm, #n is the preferred syntax for MOV{S}{cond} Rd, Rm, ASR #n LSL{S}{cond} Rd, Rm, #n is the preferred syntax for MOV{S}{cond} Rd, Rm, LSL #n if n != 0 LSR{S}{cond} Rd, Rm, #n is the preferred syntax for MOV{S}{cond} Rd, Rm, LSR #n ROR{S}{cond} Rd, Rm, #n is the preferred syntax for MOV{S}{cond} Rd, Rm, ROR #n RRX{S}{cond} Rd, Rm is the preferred syntax for MOV{S}{cond} Rd, Rm, RRX. Also, the MOV instruction permits additional forms of Operand2 as synonyms for shift instructions: MOV{S}{cond} Rd, Rm, ASR Rs is a synonym for ASR{S}{cond} Rd, Rm, Rs MOV{S}{cond} Rd, Rm, LSL Rs is a synonym for LSL{S}{cond} Rd, Rm, Rs MOV{S}{cond} Rd, Rm, LSR Rs is a synonym for LSR{S}{cond} Rd, Rm, Rs MOV{S}{cond} Rd, Rm, ROR Rs is a synonym for ROR{S}{cond} Rd, Rm, Rs See "ASR, LSL, LSR, ROR, and RRX" . The MVN instruction takes the value of Operand2, performs a bitwise logical NOT operation on the value, and places the result into Rd. The MOVW instruction provides the same function as MOV, but is restricted to using the imm16 operand. Restrictions SP and PC only can be used in the MOV instruction, with the following restrictions: The second operand must be a register without shift The S suffix must not be specified. When Rd is PC in a MOV instruction: Bit[0] of the value written to the PC is ignored A branch occurs to the address created by forcing bit[0] of that value to 0. Though it is possible to use MOV as a branch instruction, ARM strongly recommends the use of a BX or BLX instruction to branch for software portability to the ARM instruction set. Condition Flags SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 123 If S is specified, these instructions: Update the N and Z flags according to the result Can update the C flag during the calculation of Operand2, see "Flexible Second Operand" Do not affect the V flag. Examples MOVS R11, #0x000B ; Write value of 0x000B to R11, flags get updated MOV R1, #0xFA05 ; Write value of 0xFA05 to R1, flags are not updated MOVS R10, R12 ; Write value in R12 to R10, flags get updated MOV R3, #23 ; Write value of 23 to R3 MOV R8, SP ; Write value of stack pointer to R8 MVNS R2, #0xF ; Write value of 0xFFFFFFF0 (bitwise inverse of 0xF) ; to the R2 and update flags. 12.6.5.7 MOVT Move Top. Syntax MOVT{cond} Rd, #imm16 where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. imm16 is a 16-bit immediate constant. Operation MOVT writes a 16-bit immediate value, imm16, to the top halfword, Rd[31:16], of its destination register. The write does not affect Rd[15:0]. The MOV, MOVT instruction pair enables to generate any 32-bit constant. Restrictions Rd must not be SP and must not be PC. Condition Flags This instruction does not change the flags. Examples MOVT 12.6.5.8 R3, #0xF123 ; Write 0xF123 to upper halfword of R3, lower halfword ; and APSR are unchanged. REV, REV16, REVSH, and RBIT Reverse bytes and Reverse bits. Syntax op{cond} Rd, Rn where: op is any of: REV Reverse byte order in a word. REV16 Reverse byte order in each halfword independently. 124 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 REVSH Reverse byte order in the bottom halfword, and sign extend to 32 bits. RBIT Reverse the bit order in a 32-bit word. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the register holding the operand. Operation Use these instructions to change endianness of data: REV converts either: 32-bit big-endian data into little-endian data 32-bit little-endian data into big-endian data. REV16 converts either: 16-bit big-endian data into little-endian data 16-bit little-endian data into big-endian data. REVSH converts either: 16-bit signed big-endian data into 32-bit signed little-endian data 16-bit signed little-endian data into 32-bit signed big-endian data. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples REV REV16 REVSH REVHS RBIT R3, R0, R0, R3, R7, R7; R0; R5; R7; R8; Reverse Reverse Reverse Reverse Reverse byte order of value in R7 and write it to R3 byte order of each 16-bit halfword in R0 Signed Halfword with Higher or Same condition bit order of value in R8 and write the result to R7. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 125 12.6.5.9 SADD16 and SADD8 Signed Add 16 and Signed Add 8 Syntax op{cond}{Rd,} Rn, Rm where: op is any of: SADD16 Performs two 16-bit signed integer additions. SADD8 Performs four 8-bit signed integer additions. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first register holding the operand. Rm is the second register holding the operand. Operation Use these instructions to perform a halfword or byte add in parallel: The SADD16 instruction: 1. Adds each halfword from the first operand to the corresponding halfword of the second operand. 2. Writes the result in the corresponding halfwords of the destination register. The SADD8 instruction: 1. Adds each byte of the first operand to the corresponding byte of the second operand. Writes the result in the corresponding bytes of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples SADD16 R1, R0 SADD8 126 ; ; ; R4, R0, R5 ; ; SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Adds the halfwords in R0 to the corresponding halfwords of R1 and writes to corresponding halfword of R1. Adds bytes of R0 to the corresponding byte in R5 and writes to the corresponding byte in R4. 12.6.5.10 SHADD16 and SHADD8 Signed Halving Add 16 and Signed Halving Add 8 Syntax op{cond}{Rd,} Rn, Rm where: op is any of: SHADD16 Signed Halving Add 16. SHADD8 Signed Halving Add 8. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register. Rm is the second operand register. Operation Use these instructions to add 16-bit and 8-bit data and then to halve the result before writing the result to the destination register: The SHADD16 instruction: 1. Adds each halfword from the first operand to the corresponding halfword of the second operand. 2. Shuffles the result by one bit to the right, halving the data. 3. Writes the halfword results in the destination register. The SHADDB8 instruction: 1. Adds each byte of the first operand to the corresponding byte of the second operand. 2. Shuffles the result by one bit to the right, halving the data. 3. Writes the byte results in the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples SHADD16 R1, R0 SHADD8 ; ; ; R4, R0, R5 ; ; Adds halfwords in R0 to corresponding halfword of R1 and writes halved result to corresponding halfword in R1 Adds bytes of R0 to corresponding byte in R5 and writes halved result to corresponding byte in R4. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 127 12.6.5.11 SHASX and SHSAX Signed Halving Add and Subtract with Exchange and Signed Halving Subtract and Add with Exchange. Syntax op{cond} {Rd}, Rn, Rm where: op is any of: SHASX Add and Subtract with Exchange and Halving. SHSAX Subtract and Add with Exchange and Halving. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The SHASX instruction: 1. Adds the top halfword of the first operand with the bottom halfword of the second operand. 2. Writes the halfword result of the addition to the top halfword of the destination register, shifted by one bit to the right causing a divide by two, or halving. 3. Subtracts the top halfword of the second operand from the bottom highword of the first operand. 4. Writes the halfword result of the division in the bottom halfword of the destination register, shifted by one bit to the right causing a divide by two, or halving. The SHSAX instruction: 1. Subtracts the bottom halfword of the second operand from the top highword of the first operand. 2. Writes the halfword result of the addition to the bottom halfword of the destination register, shifted by one bit to the right causing a divide by two, or halving. 3. Adds the bottom halfword of the first operand with the top halfword of the second operand. 4. Writes the halfword result of the division in the top halfword of the destination register, shifted by one bit to the right causing a divide by two, or halving. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. 128 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Examples SHASX R7, R4, R2 SHSAX R0, R3, R5 ; ; ; ; ; ; ; ; Adds top halfword of R4 to bottom halfword of R2 and writes halved result to top halfword of R7 Subtracts top halfword of R2 from bottom halfword of R4 and writes halved result to bottom halfword of R7 Subtracts bottom halfword of R5 from top halfword of R3 and writes halved result to top halfword of R0 Adds top halfword of R5 to bottom halfword of R3 and writes halved result to bottom halfword of R0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 129 12.6.5.12 SHSUB16 and SHSUB8 Signed Halving Subtract 16 and Signed Halving Subtract 8 Syntax op{cond}{Rd,} Rn, Rm where: op is any of: SHSUB16 Signed Halving Subtract 16. SHSUB8 Signed Halving Subtract 8. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register. Rm is the second operand register. Operation Use these instructions to add 16-bit and 8-bit data and then to halve the result before writing the result to the destination register: The SHSUB16 instruction: 1. Subtracts each halfword of the second operand from the corresponding halfwords of the first operand. 2. Shuffles the result by one bit to the right, halving the data. 3. Writes the halved halfword results in the destination register. The SHSUBB8 instruction: 1. Subtracts each byte of the second operand from the corresponding byte of the first operand, 2. Shuffles the result by one bit to the right, halving the data, 3. Writes the corresponding signed byte results in the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples SHSUB16 R1, R0 SHSUB8 130 ; ; R4, R0, R5 ; ; SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Subtracts halfwords in R0 from corresponding halfword of R1 and writes to corresponding halfword of R1 Subtracts bytes of R0 from corresponding byte in R5, and writes to corresponding byte in R4. 12.6.5.13 SSUB16 and SSUB8 Signed Subtract 16 and Signed Subtract 8 Syntax op{cond}{Rd,} Rn, Rm where: op is any of: SSUB16 Performs two 16-bit signed integer subtractions. SSUB8 Performs four 8-bit signed integer subtractions. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register. Rm is the second operand register. Operation Use these instructions to change endianness of data: The SSUB16 instruction: 1. Subtracts each halfword from the second operand from the corresponding halfword of the first operand 2. Writes the difference result of two signed halfwords in the corresponding halfword of the destination register. The SSUB8 instruction: 1. Subtracts each byte of the second operand from the corresponding byte of the first operand 2. Writes the difference result of four signed bytes in the corresponding byte of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples SSUB16 R1, R0 SSUB8 ; ; R4, R0, R5 ; ; Subtracts halfwords in R0 from corresponding halfword of R1 and writes to corresponding halfword of R1 Subtracts bytes of R5 from corresponding byte in R0, and writes to corresponding byte of R4. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 131 12.6.5.14 SASX and SSAX Signed Add and Subtract with Exchange and Signed Subtract and Add with Exchange. Syntax op{cond} {Rd}, Rm, Rn where: op is any of: SASX Signed Add and Subtract with Exchange. SSAX Signed Subtract and Add with Exchange. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The SASX instruction: 1. Adds the signed top halfword of the first operand with the signed bottom halfword of the second operand. 2. Writes the signed result of the addition to the top halfword of the destination register. 3. Subtracts the signed bottom halfword of the second operand from the top signed highword of the first operand. 4. Writes the signed result of the subtraction to the bottom halfword of the destination register. The SSAX instruction: 1. Subtracts the signed bottom halfword of the second operand from the top signed highword of the first operand. 2. Writes the signed result of the addition to the bottom halfword of the destination register. 3. Adds the signed top halfword of the first operand with the signed bottom halfword of the second operand. 4. Writes the signed result of the subtraction to the top halfword of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. Examples SASX SSAX 12.6.5.15 R0, R4, R5 ; ; ; ; R7, R3, R2 ; ; ; ; Adds top halfword of R4 to bottom halfword of R5 and writes to top halfword of R0 Subtracts bottom halfword of R5 from top halfword of R4 and writes to bottom halfword of R0 Subtracts top halfword of R2 from bottom halfword of R3 and writes to bottom halfword of R7 Adds top halfword of R3 with bottom halfword of R2 and writes to top halfword of R7. TST and TEQ Test bits and Test Equivalence. Syntax TST{cond} Rn, Operand2 TEQ{cond} Rn, Operand2 132 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 where cond is an optional condition code, see "Conditional Execution" . Rn is the register holding the first operand. Operand2 is a flexible second operand. See "Flexible Second Operand" for details of the options. Operation These instructions test the value in a register against Operand2. They update the condition flags based on the result, but do not write the result to a register. The TST instruction performs a bitwise AND operation on the value in Rn and the value of Operand2. This is the same as the ANDS instruction, except that it discards the result. To test whether a bit of Rn is 0 or 1, use the TST instruction with an Operand2 constant that has that bit set to 1 and all other bits cleared to 0. The TEQ instruction performs a bitwise Exclusive OR operation on the value in Rn and the value of Operand2. This is the same as the EORS instruction, except that it discards the result. Use the TEQ instruction to test if two values are equal without affecting the V or C flags. TEQ is also useful for testing the sign of a value. After the comparison, the N flag is the logical Exclusive OR of the sign bits of the two operands. Restrictions Do not use SP and do not use PC. Condition Flags These instructions: Update the N and Z flags according to the result Can update the C flag during the calculation of Operand2, see "Flexible Second Operand" Do not affect the V flag. Examples TST TEQEQ 12.6.5.16 R0, #0x3F8 ; ; R10, R9 ; ; Perform bitwise AND of R0 value to 0x3F8, APSR is updated but result is discarded Conditionally test if value in R10 is equal to value in R9, APSR is updated but result is discarded. UADD16 and UADD8 Unsigned Add 16 and Unsigned Add 8 Syntax op{cond}{Rd,} Rn, Rm where: op is any of: UADD16 Performs two 16-bit unsigned integer additions. UADD8 Performs four 8-bit unsigned integer additions. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first register holding the operand. Rm is the second register holding the operand. Operation SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 133 Use these instructions to add 16- and 8-bit unsigned data: The UADD16 instruction: 1. Adds each halfword from the first operand to the corresponding halfword of the second operand. 2. Writes the unsigned result in the corresponding halfwords of the destination register. The UADD16 instruction: 1. Adds each byte of the first operand to the corresponding byte of the second operand. 2. Writes the unsigned result in the corresponding byte of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples UADD16 R1, R0 UADD8 134 R4, R0, R5 ; ; ; ; SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Adds halfwords in R0 to corresponding halfword of R1, writes to corresponding halfword of R1 Adds bytes of R0 to corresponding byte in R5 and writes to corresponding byte in R4. 12.6.5.17 UASX and USAX Add and Subtract with Exchange and Subtract and Add with Exchange. Syntax op{cond} {Rd}, Rn, Rm where: op is one of: UASX Add and Subtract with Exchange. USAX Subtract and Add with Exchange. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The UASX instruction: 1. Subtracts the top halfword of the second operand from the bottom halfword of the first operand. 2. Writes the unsigned result from the subtraction to the bottom halfword of the destination register. 3. Adds the top halfword of the first operand with the bottom halfword of the second operand. 4. Writes the unsigned result of the addition to the top halfword of the destination register. The USAX instruction: 1. Adds the bottom halfword of the first operand with the top halfword of the second operand. 2. Writes the unsigned result of the addition to the bottom halfword of the destination register. 3. Subtracts the bottom halfword of the second operand from the top halfword of the first operand. 4. Writes the unsigned result from the subtraction to the top halfword of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. Examples UASX USAX 12.6.5.18 R0, R4, R5 ; ; ; ; R7, R3, R2 ; ; ; ; Adds top halfword of R4 to bottom halfword of R5 and writes to top halfword of R0 Subtracts bottom halfword of R5 from top halfword of R0 and writes to bottom halfword of R0 Subtracts top halfword of R2 from bottom halfword of R3 and writes to bottom halfword of R7 Adds top halfword of R3 to bottom halfword of R2 and writes to top halfword of R7. UHADD16 and UHADD8 Unsigned Halving Add 16 and Unsigned Halving Add 8 Syntax op{cond}{Rd,} Rn, Rm where: op is any of: UHADD16 Unsigned Halving Add 16. UHADD8 Unsigned Halving Add 8. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 135 cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the register holding the first operand. Rm is the register holding the second operand. Operation Use these instructions to add 16- and 8-bit data and then to halve the result before writing the result to the destination register: The UHADD16 instruction: 1. Adds each halfword from the first operand to the corresponding halfword of the second operand. 2. Shuffles the halfword result by one bit to the right, halving the data. 3. Writes the unsigned results to the corresponding halfword in the destination register. The UHADD8 instruction: 1. Adds each byte of the first operand to the corresponding byte of the second operand. 2. Shuffles the byte result by one bit to the right, halving the data. 3. Writes the unsigned results in the corresponding byte in the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples UHADD16 R7, R3 UHADD8 12.6.5.19 R4, R0, R5 ; ; ; ; ; Adds halfwords in R7 to corresponding halfword of R3 and writes halved result to corresponding halfword in R7 Adds bytes of R0 to corresponding byte in R5 and writes halved result to corresponding byte in R4. UHASX and UHSAX Unsigned Halving Add and Subtract with Exchange and Unsigned Halving Subtract and Add with Exchange. Syntax op{cond} {Rd}, Rn, Rm where: op is one of: UHASX Add and Subtract with Exchange and Halving. UHSAX Subtract and Add with Exchange and Halving. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The UHASX instruction: 1. Adds the top halfword of the first operand with the bottom halfword of the second operand. 136 2. Shifts the result by one bit to the right causing a divide by two, or halving. 3. Writes the halfword result of the addition to the top halfword of the destination register. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 4. Subtracts the top halfword of the second operand from the bottom highword of the first operand. 5. Shifts the result by one bit to the right causing a divide by two, or halving. 6. Writes the halfword result of the division in the bottom halfword of the destination register. The UHSAX instruction: 1. Subtracts the bottom halfword of the second operand from the top highword of the first operand. 2. Shifts the result by one bit to the right causing a divide by two, or halving. 3. Writes the halfword result of the subtraction in the top halfword of the destination register. 4. Adds the bottom halfword of the first operand with the top halfword of the second operand. 5. Shifts the result by one bit to the right causing a divide by two, or halving. 6. Writes the halfword result of the addition to the bottom halfword of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. Examples UHASX UHSAX R7, R4, R2 ; ; ; ; R0, R3, R5 ; ; ; ; Adds top halfword of R4 with bottom halfword of R2 and writes halved result to top halfword of R7 Subtracts top halfword of R2 from bottom halfword of R7 and writes halved result to bottom halfword of R7 Subtracts bottom halfword of R5 from top halfword of R3 and writes halved result to top halfword of R0 Adds top halfword of R5 to bottom halfword of R3 and writes halved result to bottom halfword of R0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 137 12.6.5.20 UHSUB16 and UHSUB8 Unsigned Halving Subtract 16 and Unsigned Halving Subtract 8 Syntax op{cond}{Rd,} Rn, Rm where: op is any of: UHSUB16 Performs two unsigned 16-bit integer additions, halves the results, and writes the results to the destination register. UHSUB8 Performs four unsigned 8-bit integer additions, halves the results, and writes the results to the destination register. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first register holding the operand. Rm is the second register holding the operand. Operation Use these instructions to add 16-bit and 8-bit data and then to halve the result before writing the result to the destination register: The UHSUB16 instruction: 1. Subtracts each halfword of the second operand from the corresponding halfword of the first operand. 2. Shuffles each halfword result to the right by one bit, halving the data. 3. Writes each unsigned halfword result to the corresponding halfwords in the destination register. The UHSUB8 instruction: 1. Subtracts each byte of second operand from the corresponding byte of the first operand. 2. Shuffles each byte result by one bit to the right, halving the data. 3. Writes the unsigned byte results to the corresponding byte of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples UHSUB16 R1, R0 UHSUB8 12.6.5.21 R4, R0, R5 ; ; ; ; Subtracts halfwords in R0 from corresponding halfword of R1 and writes halved result to corresponding halfword in R1 Subtracts bytes of R5 from corresponding byte in R0 and writes halved result to corresponding byte in R4. SEL Select Bytes. Selects each byte of its result from either its first operand or its second operand, according to the values of the GE flags. Syntax SEL{<c>}{<q>} {<Rd>,} <Rn>, <Rm> where: c, q 138 are standard assembler syntax fields. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Rd is the destination register. Rn is the first register holding the operand. Rm is the second register holding the operand. Operation The SEL instruction: 1. Reads the value of each bit of APSR.GE. 2. Depending on the value of APSR.GE, assigns the destination register the value of either the first or second operand register. Restrictions None. Condition Flags These instructions do not change the flags. Examples SADD16 R0, R1, R2 SEL R0, R0, R3 ; Set GE bits based on result ; Select bytes from R0 or R3, based on GE. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 139 12.6.5.22 USAD8 Unsigned Sum of Absolute Differences Syntax USAD8{cond}{Rd,} Rn, Rm where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register. Rm is the second operand register. Operation The USAD8 instruction: 1. Subtracts each byte of the second operand register from the corresponding byte of the first operand register. 2. Adds the absolute values of the differences together. 3. Writes the result to the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples USAD8 R1, R4, R0 ; ; USAD8 R0, R5 ; ; 140 Subtracts each byte in R0 from corresponding byte of R4 adds the differences and writes to R1 Subtracts bytes of R5 from corresponding byte in R0, adds the differences and writes to R0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.5.23 USADA8 Unsigned Sum of Absolute Differences and Accumulate Syntax USADA8{cond}{Rd,} Rn, Rm, Ra where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register. Rm is the second operand register. Ra is the register that contains the accumulation value. Operation The USADA8 instruction: 1. Subtracts each byte of the second operand register from the corresponding byte of the first operand register. 2. Adds the unsigned absolute differences together. 3. Adds the accumulation value to the sum of the absolute differences. 4. Writes the result to the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples USADA8 R1, R0, R6 USADA8 R4, R0, R5, R2 ; ; ; ; Subtracts bytes in R0 from corresponding halfword of R1 adds differences, adds value of R6, writes to R1 Subtracts bytes of R5 from corresponding byte in R0 adds differences, adds value of R2 writes to R4. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 141 12.6.5.24 USUB16 and USUB8 Unsigned Subtract 16 and Unsigned Subtract 8 Syntax op{cond}{Rd,} Rn, Rm where op is any of: USUB16 Unsigned Subtract 16. USUB8 Unsigned Subtract 8. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register. Rm is the second operand register. Operation Use these instructions to subtract 16-bit and 8-bit data before writing the result to the destination register: The USUB16 instruction: 1. Subtracts each halfword from the second operand register from the corresponding halfword of the first operand register. 2. Writes the unsigned result in the corresponding halfwords of the destination register. The USUB8 instruction: 1. Subtracts each byte of the second operand register from the corresponding byte of the first operand register. 2. Writes the unsigned byte result in the corresponding byte of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples USUB16 R1, R0 142 ; ; ; ; Subtracts halfwords in R0 from corresponding halfword of R1 and writes to corresponding halfword in R1USUB8 R4, R0, R5 Subtracts bytes of R5 from corresponding byte in R0 and writes to the corresponding byte in R4. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.6 Multiply and Divide Instructions The table below shows the multiply and divide instructions. Table 12-21. Multiply and Divide Instructions Mnemonic Description MLA Multiply with Accumulate, 32-bit result MLS Multiply and Subtract, 32-bit result MUL Multiply, 32-bit result SDIV Signed Divide SMLA[B,T] Signed Multiply Accumulate (halfwords) SMLAD, SMLADX Signed Multiply Accumulate Dual SMLAL Signed Multiply with Accumulate (32 x 32 + 64), 64-bit result SMLAL[B,T] Signed Multiply Accumulate Long (halfwords) SMLALD, SMLALDX Signed Multiply Accumulate Long Dual SMLAW[B|T] Signed Multiply Accumulate (word by halfword) SMLSD Signed Multiply Subtract Dual SMLSLD Signed Multiply Subtract Long Dual SMMLA Signed Most Significant Word Multiply Accumulate SMMLS, SMMLSR Signed Most Significant Word Multiply Subtract SMUAD, SMUADX Signed Dual Multiply Add SMUL[B,T] Signed Multiply (word by halfword) SMMUL, SMMULR Signed Most Significant Word Multiply SMULL Signed Multiply (32x32), 64-bit result SMULWB, SMULWT Signed Multiply (word by halfword) SMUSD, SMUSDX Signed Dual Multiply Subtract UDIV Unsigned Divide UMAAL Unsigned Multiply Accumulate Accumulate Long (32 x 32 + 32 + 32), 64-bit result UMLAL Unsigned Multiply with Accumulate (32 x 32 + 64), 64-bit result UMULL Unsigned Multiply (32 x 32), 64-bit result SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 143 12.6.6.1 MUL, MLA, and MLS Multiply, Multiply with Accumulate, and Multiply with Subtract, using 32-bit operands, and producing a 32-bit result. Syntax MUL{S}{cond} {Rd,} Rn, Rm ; Multiply MLA{cond} Rd, Rn, Rm, Ra ; Multiply with accumulate MLS{cond} Rd, Rn, Rm, Ra ; Multiply with subtract where: cond is an optional condition code, see "Conditional Execution" . S is an optional suffix. If S is specified, the condition code flags are updated on the result operation, see "Conditional Execution" . Rd is the destination register. If Rd is omitted, the destination register is Rn. Rn, Rm are registers holding the values to be multiplied. Ra is a register holding the value to be added or subtracted from. of the Operation The MUL instruction multiplies the values from Rn and Rm, and places the least significant 32 bits of the result in Rd. The MLA instruction multiplies the values from Rn and Rm, adds the value from Ra, and places the least significant 32 bits of the result in Rd. The MLS instruction multiplies the values from Rn and Rm, subtracts the product from the value from Ra, and places the least significant 32 bits of the result in Rd. The results of these instructions do not depend on whether the operands are signed or unsigned. Restrictions In these instructions, do not use SP and do not use PC. If the S suffix is used with the MUL instruction: Rd, Rn, and Rm must all be in the range R0 to R7 Rd must be the same as Rm The cond suffix must not be used. Condition Flags If S is specified, the MUL instruction: Updates the N and Z flags according to the result Does not affect the C and V flags. Examples MUL MLA MULS MULLT MLS 12.6.6.2 R10, R2, R5 R10, R2, R1, R5 R0, R2, R2 R2, R3, R2 R4, R5, R6, R7 ; ; ; ; ; Multiply, R10 Multiply with Multiply with Conditionally Multiply with = R2 x R5 accumulate, R10 = flag update, R0 = multiply, R2 = R3 subtract, R4 = R7 (R2 x R1) + R5 R2 x R2 x R2 - (R5 x R6) UMULL, UMAAL, UMLAL Unsigned Long Multiply, with optional Accumulate, using 32-bit operands and producing a 64-bit result. Syntax op{cond} RdLo, RdHi, Rn, Rm where: op 144 is one of: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 UMULL Unsigned Long Multiply. UMAAL Unsigned Long Multiply with Accumulate Accumulate. UMLAL Unsigned Long Multiply, with Accumulate. cond is an optional condition code, see "Conditional Execution" . RdHi, RdLo are the destination registers. For UMAAL, UMLAL and UMLAL they also hold the accumulating value. Rn, Rm are registers holding the first and second operands. Operation These instructions interpret the values from Rn and Rm as unsigned 32-bit integers. The UMULL instruction: Multiplies the two unsigned integers in the first and second operands. Writes the least significant 32 bits of the result in RdLo. Writes the most significant 32 bits of the result in RdHi. The UMAAL instruction: Multiplies the two unsigned 32-bit integers in the first and second operands. Adds the unsigned 32-bit integer in RdHi to the 64-bit result of the multiplication. Adds the unsigned 32-bit integer in RdLo to the 64-bit result of the addition. Writes the top 32-bits of the result to RdHi. Writes the lower 32-bits of the result to RdLo. The UMLAL instruction: Multiplies the two unsigned integers in the first and second operands. Adds the 64-bit result to the 64-bit unsigned integer contained in RdHi and RdLo. Writes the result back to RdHi and RdLo. Restrictions In these instructions: Do not use SP and do not use PC. RdHi and RdLo must be different registers. Condition Flags These instructions do not affect the condition code flags. Examples UMULL R0, R4, R5, R6 UMAAL R3, R6, R2, R7 UMLAL R2, R1, R3, R5 12.6.6.3 ; ; ; ; ; Multiplies R5 and R6, writes the top 32 bits to R4 and the bottom 32 bits to R0 Multiplies R2 and R7, adds R6, adds R3, writes the top 32 bits to R6, and the bottom 32 bits to R3 Multiplies R5 and R3, adds R1:R2, writes to R1:R2. SMLA and SMLAW Signed Multiply Accumulate (halfwords). Syntax op{XY}{cond} Rd, Rn, Rm op{Y}{cond} Rd, Rn, Rm, Ra where: op is one of: SMLA Signed Multiply Accumulate Long (halfwords). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 145 X and Y specifies which half of the source registers Rn and Rm are used as the first and second multiply operand. If X is B, then the bottom halfword, bits [15:0], of Rn is used. If X is T, then the top halfword, bits [31:16], of Rn is used. If Y is B, then the bottom halfword, bits [15:0], of Rm is used. If Y is T, then the top halfword, bits [31:16], of Rm is used SMLAW Signed Multiply Accumulate (word by halfword). Y specifies which half of the source register Rm is used as the second multiply operand. If Y is T, then the top halfword, bits [31:16] of Rm is used. If Y is B, then the bottom halfword, bits [15:0] of Rm is used. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. If Rd is omitted, the destination register is Rn. Rn, Rm are registers holding the values to be multiplied. Ra is a register holding the value to be added or subtracted from. Operation The SMALBB, SMLABT, SMLATB, SMLATT instructions: Multiplies the specified signed halfword, top or bottom, values from Rn and Rm. Adds the value in Ra to the resulting 32-bit product. Writes the result of the multiplication and addition in Rd. The non-specified halfwords of the source registers are ignored. The SMLAWB and SMLAWT instructions: Multiply the 32-bit signed values in Rn with: The top signed halfword of Rm, T instruction suffix. The bottom signed halfword of Rm, B instruction suffix. Add the 32-bit signed value in Ra to the top 32 bits of the 48-bit product Writes the result of the multiplication and addition in Rd. The bottom 16 bits of the 48-bit product are ignored. If overflow occurs during the addition of the accumulate value, the instruction sets the Q flag in the APSR. No overflow can occur during the multiplication. Restrictions In these instructions, do not use SP and do not use PC. Condition Flags If an overflow is detected, the Q flag is set. Examples SMLABB R5, R6, R4, R1 SMLATB R5, R6, R4, R1 SMLATT R5, R6, R4, R1 SMLABT R5, R6, R4, R1 SMLABT R4, R3, R2 146 ; ; ; ; ; ; ; ; ; ; Multiplies bottom halfwords of R6 and R4, adds R1 and writes to R5 Multiplies top halfword of R6 with bottom halfword of R4, adds R1 and writes to R5 Multiplies top halfwords of R6 and R4, adds R1 and writes the sum to R5 Multiplies bottom halfword of R6 with top halfword of R4, adds R1 and writes to R5 Multiplies bottom halfword of R4 with top halfword of R3, adds R2 and writes to R4 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SMLAWB SMLAWT R10, R2, R5, R3 ; ; R10, R2, R1, R5 ; ; Multiplies R2 with bottom halfword of R5, adds R3 to the result and writes top 32-bits to R10 Multiplies R2 with top halfword of R1, adds R5 and writes top 32-bits to R10. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 147 12.6.6.4 SMLAD Signed Multiply Accumulate Long Dual Syntax op{X}{cond} Rd, Rn, Rm, Ra ; where: op is one of: SMLAD Signed Multiply Accumulate Dual. SMLADX Signed Multiply Accumulate Dual Reverse. X specifies which halfword of the source register Rn is used as the multiply operand. If X is omitted, the multiplications are bottom x bottom and top x top. If X is present, the multiplications are bottom x top and top x bottom. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register holding the values to be multiplied. Rm the second operand register. Ra is the accumulate value. Operation The SMLAD and SMLADX instructions regard the two operands as four halfword 16-bit values. The SMLAD and SMLADX instructions: If X is not present, multiply the top signed halfword value in Rn with the top signed halfword of Rm and the bottom signed halfword values in Rn with the bottom signed halfword of Rm. Or if X is present, multiply the top signed halfword value in Rn with the bottom signed halfword of Rm and the bottom signed halfword values in Rn with the top signed halfword of Rm. Add both multiplication results to the signed 32-bit value in Ra. Writes the 32-bit signed result of the multiplication and addition to Rd. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples SMLAD R10, R2, R1, R5 ; ; ; SMLALDX R0, R2, R4, R6 ; ; ; ; 12.6.6.5 Multiplies two halfword values in R2 with corresponding halfwords in R1, adds R5 and writes to R10 Multiplies top halfword of R2 with bottom halfword of R4, multiplies bottom halfword of R2 with top halfword of R4, adds R6 and writes to R0. SMLAL and SMLALD Signed Multiply Accumulate Long, Signed Multiply Accumulate Long (halfwords) and Signed Multiply Accumulate Long Dual. Syntax op{cond} RdLo, RdHi, Rn, Rm 148 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 op{XY}{cond} RdLo, RdHi, Rn, Rm op{X}{cond} RdLo, RdHi, Rn, Rm where: op is one of: MLAL Signed Multiply Accumulate Long. SMLAL Signed Multiply Accumulate Long (halfwords, X and Y). X and Y specify which halfword of the source registers Rn and Rm are used as the first and second multiply operand: If X is B, then the bottom halfword, bits [15:0], of Rn is used. If X is T, then the top halfword, bits [31:16], of Rn is used. If Y is B, then the bottom halfword, bits [15:0], of Rm is used. If Y is T, then the top halfword, bits [31:16], of Rm is used. SMLALD Signed Multiply Accumulate Long Dual. SMLALDX Signed Multiply Accumulate Long Dual Reversed. If the X is omitted, the multiplications are bottom x bottom and top x top. If X is present, the multiplications are bottom x top and top x bottom. cond is an optional condition code, see "Conditional Execution" . RdHi, RdLo are the destination registers. RdLo is the lower 32 bits and RdHi is the upper 32 bits of the 64-bit integer. For SMLAL, SMLALBB, SMLALBT, SMLALTB, SMLALTT, SMLALD and SMLA LDX, they also hold the accumulating value. Rn, Rm are registers holding the first and second operands. Operation The SMLAL instruction: Multiplies the two's complement signed word values from Rn and Rm. Adds the 64-bit value in RdLo and RdHi to the resulting 64-bit product. Writes the 64-bit result of the multiplication and addition in RdLo and RdHi. The SMLALBB, SMLALBT, SMLALTB and SMLALTT instructions: Multiplies the specified signed halfword, Top or Bottom, values from Rn and Rm. Adds the resulting sign-extended 32-bit product to the 64-bit value in RdLo and RdHi. Writes the 64-bit result of the multiplication and addition in RdLo and RdHi. The non-specified halfwords of the source registers are ignored. The SMLALD and SMLALDX instructions interpret the values from Rn and Rm as four halfword two's complement signed 16-bit integers. These instructions: If X is not present, multiply the top signed halfword value of Rn with the top signed halfword of Rm and the bottom signed halfword values of Rn with the bottom signed halfword of Rm. Or if X is present, multiply the top signed halfword value of Rn with the bottom signed halfword of Rm and the bottom signed halfword values of Rn with the top signed halfword of Rm. Add the two multiplication results to the signed 64-bit value in RdLo and RdHi to create the resulting 64-bit product. Write the 64-bit product in RdLo and RdHi. Restrictions In these instructions: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 149 Do not use SP and do not use PC. RdHi and RdLo must be different registers. Condition Flags These instructions do not affect the condition code flags. Examples SMLAL R4, R5, R3, R8 SMLALBT R2, R1, R6, R7 SMLALTB R2, R1, R6, R7 SMLALD R6, R8, R5, R1 SMLALDX R6, R8, R5, R1 150 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Multiplies R3 and R8, adds R5:R4 and writes to R5:R4 Multiplies bottom halfword of R6 with top halfword of R7, sign extends to 32-bit, adds R1:R2 and writes to R1:R2 Multiplies top halfword of R6 with bottom halfword of R7,sign extends to 32-bit, adds R1:R2 and writes to R1:R2 Multiplies top halfwords in R5 and R1 and bottom halfwords of R5 and R1, adds R8:R6 and writes to R8:R6 Multiplies top halfword in R5 with bottom halfword of R1, and bottom halfword of R5 with top halfword of R1, adds R8:R6 and writes to R8:R6. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.6.6 SMLSD and SMLSLD Signed Multiply Subtract Dual and Signed Multiply Subtract Long Dual Syntax op{X}{cond} Rd, Rn, Rm, Ra where: op is one of: SMLSD Signed Multiply Subtract Dual. SMLSDX Signed Multiply Subtract Dual Reversed. SMLSLD Signed Multiply Subtract Long Dual. SMLSLDX Signed Multiply Subtract Long Dual Reversed. SMLAW Signed Multiply Accumulate (word by halfword). If X is present, the multiplications are bottom x top and top x bottom. If the X is omitted, the multiplications are bottom x bottom and top x top. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Ra is the register holding the accumulate value. Operation The SMLSD instruction interprets the values from the first and second operands as four signed halfwords. This instruction: Optionally rotates the halfwords of the second operand. Performs two signed 16 x 16-bit halfword multiplications. Subtracts the result of the upper halfword multiplication from the result of the lower halfword multiplication. Adds the signed accumulate value to the result of the subtraction. Writes the result of the addition to the destination register. The SMLSLD instruction interprets the values from Rn and Rm as four signed halfwords. This instruction: Optionally rotates the halfwords of the second operand. Performs two signed 16 x 16-bit halfword multiplications. Subtracts the result of the upper halfword multiplication from the result of the lower halfword multiplication. Adds the 64-bit value in RdHi and RdLo to the result of the subtraction. Writes the 64-bit result of the addition to the RdHi and RdLo. Restrictions In these instructions: Do not use SP and do not use PC. Condition Flags This instruction sets the Q flag if the accumulate operation overflows. Overflow cannot occur during the multiplications or subtraction. For the Thumb instruction set, these instructions do not affect the condition code flags. Examples SMLSD R0, R4, R5, R6 ; Multiplies bottom halfword of R4 with bottom ; halfword of R5, multiplies top halfword of R4 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 151 ; ; SMLSDX R1, R3, R2, R0 ; ; ; ; SMLSLD R3, R6, R2, R7 ; ; ; ; SMLSLDX R3, R6, R2, R7 ; ; ; ; 152 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 with top halfword of R5, subtracts second from first, adds R6, writes to R0 Multiplies bottom halfword of R3 with top halfword of R2, multiplies top halfword of R3 with bottom halfword of R2, subtracts second from first, adds R0, writes to R1 Multiplies bottom halfword of R6 with bottom halfword of R2, multiplies top halfword of R6 with top halfword of R2, subtracts second from first, adds R6:R3, writes to R6:R3 Multiplies bottom halfword of R6 with top halfword of R2, multiplies top halfword of R6 with bottom halfword of R2, subtracts second from first, adds R6:R3, writes to R6:R3. 12.6.6.7 SMMLA and SMMLS Signed Most Significant Word Multiply Accumulate and Signed Most Significant Word Multiply Subtract Syntax op{R}{cond} Rd, Rn, Rm, Ra where: op is one of: SMMLA Signed Most Significant Word Multiply Accumulate. SMMLS Signed Most Significant Word Multiply Subtract. If the X is omitted, the multiplications are bottom x bottom and top x top. R is a rounding error flag. If R is specified, the result is rounded instead of being truncated. In this case the constant 0x80000000 is added to the product before the high word is extracted. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second multiply operands. Ra is the register holding the accumulate value. Operation The SMMLA instruction interprets the values from Rn and Rm as signed 32-bit words. The SMMLA instruction: Multiplies the values in Rn and Rm. Optionally rounds the result by adding 0x80000000. Extracts the most significant 32 bits of the result. Adds the value of Ra to the signed extracted value. Writes the result of the addition in Rd. The SMMLS instruction interprets the values from Rn and Rm as signed 32-bit words. The SMMLS instruction: Multiplies the values in Rn and Rm. Optionally rounds the result by adding 0x80000000. Extracts the most significant 32 bits of the result. Subtracts the extracted value of the result from the value in Ra. Writes the result of the subtraction in Rd. Restrictions In these instructions: Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. Examples SMMLA R0, R4, R5, R6 SMMLAR R6, R2, R1, R4 SMMLSR R3, R6, R2, R7 ; ; ; ; ; ; Multiplies R4 and R5, extracts top R6, truncates and writes to R0 Multiplies R2 and R1, extracts top R4, rounds and writes to R6 Multiplies R6 and R2, extracts top subtracts R7, rounds and writes to 32 bits, adds 32 bits, adds 32 bits, R3 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 153 SMMLS 12.6.6.8 R4, R5, R3, R8 ; Multiplies R5 and R3, extracts top 32 bits, ; subtracts R8, truncates and writes to R4. SMMUL Signed Most Significant Word Multiply Syntax op{R}{cond} Rd, Rn, Rm where: op is one of: SMMUL Signed Most Significant Word Multiply. R is a rounding error flag. If R is specified, the result is rounded instead of being truncated. In this case the constant 0x80000000 is added to the product before the high word is extracted. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The SMMUL instruction interprets the values from Rn and Rm as two's complement 32-bit signed integers. The SMMUL instruction: Multiplies the values from Rn and Rm. Optionally rounds the result, otherwise truncates the result. Writes the most significant signed 32 bits of the result in Rd. Restrictions In this instruction: do not use SP and do not use PC. Condition Flags This instruction does not affect the condition code flags. Examples SMULL SMULLR 12.6.6.9 R0, R4, R5 R6, R2 ; ; ; ; Multiplies and writes Multiplies and writes R4 to R6 to and R5, truncates top 32 bits R0 and R2, rounds the top 32 bits R6. SMUAD and SMUSD Signed Dual Multiply Add and Signed Dual Multiply Subtract Syntax op{X}{cond} Rd, Rn, Rm where: op is one of: SMUAD Signed Dual Multiply Add. SMUADX Signed Dual Multiply Add Reversed. SMUSD Signed Dual Multiply Subtract. 154 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SMUSDX Signed Dual Multiply Subtract Reversed. If X is present, the multiplications are bottom x top and top x bottom. If the X is omitted, the multiplications are bottom x bottom and top x top. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The SMUAD instruction interprets the values from the first and second operands as two signed halfwords in each operand. This instruction: Optionally rotates the halfwords of the second operand. Performs two signed 16 x 16-bit multiplications. Adds the two multiplication results together. Writes the result of the addition to the destination register. The SMUSD instruction interprets the values from the first and second operands as two's complement signed integers. This instruction: Optionally rotates the halfwords of the second operand. Performs two signed 16 x 16-bit multiplications. Subtracts the result of the top halfword multiplication from the result of the bottom halfword multiplication. Writes the result of the subtraction to the destination register. Restrictions In these instructions: Do not use SP and do not use PC. Condition Flags Sets the Q flag if the addition overflows. The multiplications cannot overflow. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 155 Examples SMUAD R0, R4, R5 SMUADX R3, R7, R4 SMUSD R3, R6, R2 SMUSDX R4, R5, R3 12.6.6.10 ; ; ; ; ; ; ; ; ; ; ; ; Multiplies bottom halfword of R4 with the bottom halfword of R5, adds multiplication of top halfword of R4 with top halfword of R5, writes to R0 Multiplies bottom halfword of R7 with top halfword of R4, adds multiplication of top halfword of R7 with bottom halfword of R4, writes to R3 Multiplies bottom halfword of R4 with bottom halfword of R6, subtracts multiplication of top halfword of R6 with top halfword of R3, writes to R3 Multiplies bottom halfword of R5 with top halfword of R3, subtracts multiplication of top halfword of R5 with bottom halfword of R3, writes to R4. SMUL and SMULW Signed Multiply (halfwords) and Signed Multiply (word by halfword) Syntax op{XY}{cond} Rd,Rn, Rm op{Y}{cond} Rd. Rn, Rm For SMULXY only: op is one of: SMUL{XY} Signed Multiply (halfwords). X and Y specify which halfword of the source registers Rn and Rm is used as the first and second multiply operand. If X is B, then the bottom halfword, bits [15:0] of Rn is used. If X is T, then the top halfword, bits [31:16] of Rn is used.If Y is B, then the bot tom halfword, bits [15:0], of Rm is used. If Y is T, then the top halfword, bits [31:16], of Rm is used. SMULW{Y} Signed Multiply (word by halfword). Y specifies which halfword of the source register Rm is used as the second mul tiply operand. If Y is B, then the bottom halfword (bits [15:0]) of Rm is used. If Y is T, then the top halfword (bits [31:16]) of Rm is used. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The SMULBB, SMULTB, SMULBT and SMULTT instructions interprets the values from Rn and Rm as four signed 16-bit integers. These instructions: Multiplies the specified signed halfword, Top or Bottom, values from Rn and Rm. Writes the 32-bit result of the multiplication in Rd. The SMULWT and SMULWB instructions interprets the values from Rn as a 32-bit signed integer and Rm as two halfword 16-bit signed integers. These instructions: Multiplies the first operand and the top, T suffix, or the bottom, B suffix, halfword of the second operand. Writes the signed most significant 32 bits of the 48-bit result in the destination register. Restrictions 156 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 In these instructions: Do not use SP and do not use PC. RdHi and RdLo must be different registers. Examples SMULBT R0, R4, R5 SMULBB R0, R4, R5 SMULTT R0, R4, R5 SMULTB R0, R4, R5 SMULWT R4, R5, R3 SMULWB R4, R5, R3 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Multiplies the bottom halfword of R4 with the top halfword of R5, multiplies results and writes to R0 Multiplies the bottom halfword of R4 with the bottom halfword of R5, multiplies results and writes to R0 Multiplies the top halfword of R4 with the top halfword of R5, multiplies results and writes to R0 Multiplies the top halfword of R4 with the bottom halfword of R5, multiplies results and and writes to R0 Multiplies R5 with the top halfword of R3, extracts top 32 bits and writes to R4 Multiplies R5 with the bottom halfword of R3, extracts top 32 bits and writes to R4. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 157 12.6.6.11 UMULL, UMLAL, SMULL, and SMLAL Signed and Unsigned Long Multiply, with optional Accumulate, using 32-bit operands and producing a 64-bit result. Syntax op{cond} RdLo, RdHi, Rn, Rm where: op is one of: UMULL Unsigned Long Multiply. UMLAL Unsigned Long Multiply, with Accumulate. SMULL Signed Long Multiply. SMLAL Signed Long Multiply, with Accumulate. cond is an optional condition code, see "Conditional Execution" . RdHi, RdLo are the destination registers. For UMLAL and SMLAL they also hold the accu mulating value. Rn, Rm are registers holding the operands. Operation The UMULL instruction interprets the values from Rn and Rm as unsigned integers. It multiplies these integers and places the least significant 32 bits of the result in RdLo, and the most significant 32 bits of the result in RdHi. The UMLAL instruction interprets the values from Rn and Rm as unsigned integers. It multiplies these integers, adds the 64-bit result to the 64-bit unsigned integer contained in RdHi and RdLo, and writes the result back to RdHi and RdLo. The SMULL instruction interprets the values from Rn and Rm as two's complement signed integers. It multiplies these integers and places the least significant 32 bits of the result in RdLo, and the most significant 32 bits of the result in RdHi. The SMLAL instruction interprets the values from Rn and Rm as two's complement signed integers. It multiplies these integers, adds the 64-bit result to the 64-bit signed integer contained in RdHi and RdLo, and writes the result back to RdHi and RdLo. Restrictions In these instructions: Do not use SP and do not use PC RdHi and RdLo must be different registers. Condition Flags These instructions do not affect the condition code flags. Examples UMULL SMLAL 158 R0, R4, R5, R6 R4, R5, R3, R8 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ; Unsigned (R4,R0) = R5 x R6 ; Signed (R5,R4) = (R5,R4) + R3 x R8 12.6.6.12 SDIV and UDIV Signed Divide and Unsigned Divide. Syntax SDIV{cond} {Rd,} Rn, Rm UDIV{cond} {Rd,} Rn, Rm where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. If Rd is omitted, the destination register is Rn. Rn is the register holding the value to be divided. Rm is a register holding the divisor. Operation SDIV performs a signed integer division of the value in Rn by the value in Rm. UDIV performs an unsigned integer division of the value in Rn by the value in Rm. For both instructions, if the value in Rn is not divisible by the value in Rm, the result is rounded towards zero. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not change the flags. Examples SDIV UDIV R0, R2, R4 R8, R8, R1 ; Signed divide, R0 = R2/R4 ; Unsigned divide, R8 = R8/R1 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 159 12.6.7 Saturating Instructions The table below shows the saturating instructions. Table 12-22. Saturating Instructions Mnemonic Description SSAT Signed Saturate SSAT16 Signed Saturate Halfword USAT Unsigned Saturate USAT16 Unsigned Saturate Halfword QADD Saturating Add QSUB Saturating Subtract QSUB16 Saturating Subtract 16 QASX Saturating Add and Subtract with Exchange QSAX Saturating Subtract and Add with Exchange QDADD Saturating Double and Add QDSUB Saturating Double and Subtract UQADD16 Unsigned Saturating Add 16 UQADD8 Unsigned Saturating Add 8 UQASX Unsigned Saturating Add and Subtract with Exchange UQSAX Unsigned Saturating Subtract and Add with Exchange UQSUB16 Unsigned Saturating Subtract 16 UQSUB8 Unsigned Saturating Subtract 8 For signed n-bit saturation, this means that: If the value to be saturated is less than -2n-1, the result returned is -2n-1 If the value to be saturated is greater than 2n-1-1, the result returned is 2n-1-1 Otherwise, the result returned is the same as the value to be saturated. For unsigned n-bit saturation, this means that: If the value to be saturated is less than 0, the result returned is 0 If the value to be saturated is greater than 2n-1, the result returned is 2n-1 Otherwise, the result returned is the same as the value to be saturated. If the returned result is different from the value to be saturated, it is called saturation. If saturation occurs, the instruction sets the Q flag to 1 in the APSR. Otherwise, it leaves the Q flag unchanged. To clear the Q flag to 0, the MSR instruction must be used; see "MSR" . To read the state of the Q flag, the MRS instruction must be used; see "MRS" . 160 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.7.1 SSAT and USAT Signed Saturate and Unsigned Saturate to any bit position, with optional shift before saturating. Syntax op{cond} Rd, #n, Rm {, shift #s} where: op is one of: SSAT Saturates a signed value to a signed range. USAT Saturates a signed value to an unsigned range. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. n specifies the bit position to saturate to: n ranges from 1 n ranges from 0 to 31 for USAT. to 32 for SSAT Rm is the register containing the value to saturate. shift #s is an optional shift applied to Rm before saturating. It must be one of the following: ASR #s where s is in the range 1 to 31. LSL #s where s is in the range 0 to 31. Operation These instructions saturate to a signed or unsigned n-bit value. The SSAT instruction applies the specified shift, then saturates to the signed range -2n-1 x 2n-1-1. The USAT instruction applies the specified shift, then saturates to the unsigned range 0 x 2n-1. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. If saturation occurs, these instructions set the Q flag to 1. Examples SSAT R7, #16, R7, LSL #4 USATNE R0, #7, R5 ; ; ; ; ; Logical shift left value in R7 by 4, then saturate it as a signed 16-bit value and write it back to R7 Conditionally saturate value in R5 as an unsigned 7 bit value and write it to R0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 161 12.6.7.2 SSAT16 and USAT16 Signed Saturate and Unsigned Saturate to any bit position for two halfwords. Syntax op{cond} Rd, #n, Rm where: op is one of: SSAT16 Saturates a signed halfword value to a signed range. USAT16 Saturates a signed halfword value to an unsigned range. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. n specifies the bit position to saturate to: n ranges from 1 n ranges from 0 to 15 for USAT. to 16 for SSAT Rm is the register containing the value to saturate. Operation The SSAT16 instruction: Saturates two signed 16-bit halfword values of the register with the value to saturate from selected by the bit position in n. Writes the results as two signed 16-bit halfwords to the destination register. The USAT16 instruction: Saturates two unsigned 16-bit halfword values of the register with the value to saturate from selected by the bit position in n. Writes the results as two unsigned halfwords in the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. If saturation occurs, these instructions set the Q flag to 1. Examples SSAT16 USAT16NE 12.6.7.3 R7, #9, R2 R0, #13, R5 ; ; ; ; ; ; Saturates the top and bottom highwords of R2 as 9-bit values, writes to corresponding halfword of R7 Conditionally saturates the top and bottom halfwords of R5 as 13-bit values, writes to corresponding halfword of R0. QADD and QSUB Saturating Add and Saturating Subtract, signed. Syntax op{cond} {Rd}, Rn, Rm op{cond} {Rd}, Rn, Rm where: 162 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 op is one of: QADD Saturating 32-bit add. QADD8 Saturating four 8-bit integer additions. QADD16 Saturating two 16-bit integer additions. QSUB Saturating 32-bit subtraction. QSUB8 Saturating four 8-bit integer subtraction. QSUB16 Saturating two 16-bit integer subtraction. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation These instructions add or subtract two, four or eight values from the first and second operands and then writes a signed saturated value in the destination register. The QADD and QSUB instructions apply the specified add or subtract, and then saturate the result to the signed range -2n-1 x 2n-1-1, where x is given by the number of bits applied in the instruction, 32, 16 or 8. If the returned result is different from the value to be saturated, it is called saturation. If saturation occurs, the QADD and QSUB instructions set the Q flag to 1 in the APSR. Otherwise, it leaves the Q flag unchanged. The 8-bit and 16-bit QADD and QSUB instructions always leave the Q flag unchanged. To clear the Q flag to 0, the MSR instruction must be used; see "MSR" . To read the state of the Q flag, the MRS instruction must be used; see "MRS" . Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. If saturation occurs, these instructions set the Q flag to 1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 163 Examples QADD16 12.6.7.4 R7, R4, R2 QADD8 R3, R1, R6 QSUB16 R4, R2, R3 QSUB8 R4, R2, R5 ; ; ; ; ; ; ; ; ; ; ; ; Adds halfwords of R4 with corresponding halfword of R2, saturates to 16 bits and writes to corresponding halfword of R7 Adds bytes of R1 to the corresponding bytes of R6, saturates to 8 bits and writes to corresponding byte of R3 Subtracts halfwords of R3 from corresponding halfword of R2, saturates to 16 bits, writes to corresponding halfword of R4 Subtracts bytes of R5 from the corresponding byte in R2, saturates to 8 bits, writes to corresponding byte of R4. QASX and QSAX Saturating Add and Subtract with Exchange and Saturating Subtract and Add with Exchange, signed. Syntax op{cond} {Rd}, Rm, Rn where: op is one of: QASX Add and Subtract with Exchange and Saturate. QSAX Subtract and Add with Exchange and Saturate. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The QASX instruction: 1. Adds the top halfword of the source operand with the bottom halfword of the second operand. 2. Subtracts the top halfword of the second operand from the bottom highword of the first operand. 3. Saturates the result of the subtraction and writes a 16-bit signed integer in the range -215 x 215 - 1, where x equals 16, to the bottom halfword of the destination register. 4. Saturates the results of the sum and writes a 16-bit signed integer in the range -215 x 215 - 1, where x equals 16, to the top halfword of the destination register. The QSAX instruction: 1. Subtracts the bottom halfword of the second operand from the top highword of the first operand. 2. Adds the bottom halfword of the source operand with the top halfword of the second operand. 3. Saturates the results of the sum and writes a 16-bit signed integer in the range -215 x 215 - 1, where x equals 16, to the bottom halfword of the destination register. 4. Saturates the result of the subtraction and writes a 16-bit signed integer in the range -215 x 215 - 1, where x equals 16, to the top halfword of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. 164 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Examples QASX QSAX R7, R4, R2 ; ; ; ; ; R0, R3, R5 ; ; ; ; Adds top halfword of R4 to bottom halfword of R2, saturates to 16 bits, writes to top halfword of R7 Subtracts top highword of R2 from bottom halfword of R4, saturates to 16 bits and writes to bottom halfword of R7 Subtracts bottom halfword of R5 from top halfword of R3, saturates to 16 bits, writes to top halfword of R0 Adds bottom halfword of R3 to top halfword of R5, saturates to 16 bits, writes to bottom halfword of R0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 165 12.6.7.5 QDADD and QDSUB Saturating Double and Add and Saturating Double and Subtract, signed. Syntax op{cond} {Rd}, Rm, Rn where: op is one of: QDADD Saturating Double and Add. QDSUB Saturating Double and Subtract. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rm, Rn are registers holding the first and second operands. Operation The QDADD instruction: Doubles the second operand value. Adds the result of the doubling to the signed saturated value in the first operand. Writes the result to the destination register. The QDSUB instruction: Doubles the second operand value. Subtracts the doubled value from the signed saturated value in the first operand. Writes the result to the destination register. Both the doubling and the addition or subtraction have their results saturated to the 32-bit signed integer range - 231 x 231- 1. If saturation occurs in either operation, it sets the Q flag in the APSR. Restrictions Do not use SP and do not use PC. Condition Flags If saturation occurs, these instructions set the Q flag to 1. 166 Examples QDADD R7, R4, R2 QDSUB R0, R3, R5 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ; ; ; ; Doubles and saturates R4 to 32 bits, adds R2, saturates to 32 bits, writes to R7 Subtracts R3 doubled and saturated to 32 bits from R5, saturates to 32 bits, writes to R0. 12.6.7.6 UQASX and UQSAX Saturating Add and Subtract with Exchange and Saturating Subtract and Add with Exchange, unsigned. Syntax op{cond} {Rd}, Rm, Rn where: type is one of: UQASX Add and Subtract with Exchange and Saturate. UQSAX Subtract and Add with Exchange and Saturate. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation The UQASX instruction: 1. Adds the bottom halfword of the source operand with the top halfword of the second operand. 2. Subtracts the bottom halfword of the second operand from the top highword of the first operand. 3. Saturates the results of the sum and writes a 16-bit unsigned integer in the range 0 x 216 - 1, where x equals 16, to the top halfword of the destination register. 4. Saturates the result of the subtraction and writes a 16-bit unsigned integer in the range 0 x 216 - 1, where x equals 16, to the bottom halfword of the destination register. The UQSAX instruction: 1. Subtracts the bottom halfword of the second operand from the top highword of the first operand. 2. Adds the bottom halfword of the first operand with the top halfword of the second operand. 3. Saturates the result of the subtraction and writes a 16-bit unsigned integer in the range 0 x 216 - 1, where x equals 16, to the top halfword of the destination register. 4. Saturates the results of the addition and writes a 16-bit unsigned integer in the range 0 x 216 - 1, where x equals 16, to the bottom halfword of the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 167 Examples UQASX R7, R4, R2 UQSAX R0, R3, R5 12.6.7.7 ; ; ; ; ; ; ; ; Adds top halfword of R4 with bottom halfword of R2, saturates to 16 bits, writes to top halfword of R7 Subtracts top halfword of R2 from bottom halfword of R4, saturates to 16 bits, writes to bottom halfword of R7 Subtracts bottom halfword of R5 from top halfword of R3, saturates to 16 bits, writes to top halfword of R0 Adds bottom halfword of R4 to top halfword of R5 saturates to 16 bits, writes to bottom halfword of R0. UQADD and UQSUB Saturating Add and Saturating Subtract Unsigned. Syntax op{cond} {Rd}, Rn, Rm op{cond} {Rd}, Rn, Rm where: op is one of: UQADD8 Saturating four unsigned 8-bit integer additions. UQADD16 Saturating two unsigned 16-bit integer additions. UDSUB8 Saturating four unsigned 8-bit integer subtractions. UQSUB16 Saturating two unsigned 16-bit integer subtractions. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn, Rm are registers holding the first and second operands. Operation These instructions add or subtract two or four values and then writes an unsigned saturated value in the destination register. The UQADD16 instruction: Adds the respective top and bottom halfwords of the first and second operands. Saturates the result of the additions for each halfword in the destination register to the unsigned range 0 x 216-1, where x is 16. The UQADD8 instruction: Adds each respective byte of the first and second operands. Saturates the result of the addition for each byte in the destination register to the unsigned range 0 x 281, where x is 8. The UQSUB16 instruction: Subtracts both halfwords of the second operand from the respective halfwords of the first operand. Saturates the result of the differences in the destination register to the unsigned range 0 x 216-1, where x is 16. The UQSUB8 instructions: 168 Subtracts the respective bytes of the second operand from the respective bytes of the first operand. Saturates the results of the differences for each byte in the destination register to the unsigned range 0 x 28-1, where x is 8. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the condition code flags. Examples UQADD16 R7, R4, R2 UQADD8 R4, R2, R5 UQSUB16 R6, R3, R0 UQSUB8 R1, R5, R6 ; ; ; ; ; ; ; ; ; Adds halfwords in R4 to corresponding halfword in R2, saturates to 16 bits, writes to corresponding halfword of R7 Adds bytes of R2 to corresponding byte of R5, saturates to 8 bits, writes to corresponding bytes of R4 Subtracts halfwords in R0 from corresponding halfword in R3, saturates to 16 bits, writes to corresponding halfword in R6 Subtracts bytes in R6 from corresponding byte of R5, saturates to 8 bits, writes to corresponding byte of R1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 169 12.6.8 Packing and Unpacking Instructions The table below shows the instructions that operate on packing and unpacking data. Table 12-23. 170 Packing and Unpacking Instructions Mnemonic Description PKH Pack Halfword SXTAB Extend 8 bits to 32 and add SXTAB16 Dual extend 8 bits to 16 and add SXTAH Extend 16 bits to 32 and add SXTB Sign extend a byte SXTB16 Dual extend 8 bits to 16 and add SXTH Sign extend a halfword UXTAB Extend 8 bits to 32 and add UXTAB16 Dual extend 8 bits to 16 and add UXTAH Extend 16 bits to 32 and add UXTB Zero extend a byte UXTB16 Dual zero extend 8 bits to 16 and add UXTH Zero extend a halfword SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.8.1 PKHBT and PKHTB Pack Halfword Syntax op{cond} {Rd}, Rn, Rm {, LSL #imm} op{cond} {Rd}, Rn, Rm {, ASR #imm} where: op is one of: PKHBT Pack Halfword, bottom and top with shift. PKHTB Pack Halfword, top and bottom with shift. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register Rm is the second operand register holding the value to be optionally shifted. imm is the shift length. The type of shift length depends on the instruction: For PKHBT LSL a left shift with a shift length from 1 to 31, 0 means no shift. For PKHTB ASR an arithmetic shift right with a shift length from 1 to 32, a shift of 32-bits is encoded as 0b00000. Operation The PKHBT instruction: 1. Writes the value of the bottom halfword of the first operand to the bottom halfword of the destination register. 2. If shifted, the shifted value of the second operand is written to the top halfword of the destination register. The PKHTB instruction: 1. Writes the value of the top halfword of the first operand to the top halfword of the destination register. 2. If shifted, the shifted value of the second operand is written to the bottom halfword of the destination register. Restrictions Rd must not be SP and must not be PC. Condition Flags This instruction does not change the flags. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 171 Examples PKHBT R3, R4, R5 LSL #0 PKHTB R4, R0, R2 ASR #1 12.6.8.2 ; ; ; ; ; ; Writes bottom halfword of R4 to bottom halfword of R3, writes top halfword of R5, unshifted, to top halfword of R3 Writes R2 shifted right by 1 bit to bottom halfword of R4, and writes top halfword of R0 to top halfword of R4. SXT and UXT Sign extend and Zero extend. Syntax op{cond} {Rd,} Rm {, ROR #n} op{cond} {Rd}, Rm {, ROR #n} where: op is one of: SXTB Sign extends an 8-bit value to a 32-bit value. SXTH Sign extends a 16-bit value to a 32-bit value. SXTB16 Sign extends two 8-bit values to two 16-bit values. UXTB Zero extends an 8-bit value to a 32-bit value. UXTH Zero extends a 16-bit value to a 32-bit value. UXTB16 Zero extends two 8-bit values to two 16-bit values. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rm is the register holding the value to extend. ROR #n is one of: ROR #8 Value from Rm is rotated right 8 bits. Operation These instructions do the following: 1. Rotate the value from Rm right by 0, 8, 16 or 24 bits. 2. Extract bits from the resulting value: SXTB extracts bits[7:0] and sign extends to 32 bits. UXTB extracts bits[7:0] and zero extends to 32 bits. SXTH extracts bits[15:0] and sign extends to 32 bits. UXTH extracts bits[15:0] and zero extends to 32 bits. SXTB16 extracts bits[7:0] and sign extends to 16 bits, and extracts bits [23:16] and sign extends to 16 bits. UXTB16 extracts bits[7:0] and zero extends to 16 bits, and extracts bits [23:16] and zero extends to 16 bits. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the flags. 172 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Examples SXTH R4, R6, ROR #16 UXTB R3, R10 12.6.8.3 ; ; ; ; Rotates R6 right by 16 bits, obtains bottom halfword of of result, sign extends to 32 bits and writes to R4 Extracts lowest byte of value in R10, zero extends, and writes to R3. SXTA and UXTA Signed and Unsigned Extend and Add Syntax op{cond} {Rd,} Rn, Rm {, ROR #n} op{cond} {Rd,} Rn, Rm {, ROR #n} where: op is one of: SXTAB Sign extends an 8-bit value to a 32-bit value and add. SXTAH Sign extends a 16-bit value to a 32-bit value and add. SXTAB16 Sign extends two 8-bit values to two 16-bit values and add. UXTAB Zero extends an 8-bit value to a 32-bit value and add. UXTAH Zero extends a 16-bit value to a 32-bit value and add. UXTAB16 Zero extends two 8-bit values to two 16-bit values and add. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the first operand register. Rm is the register holding the value to rotate and extend. ROR #n is one of: ROR #8 Value from Rm is rotated right 8 bits. ROR #16 Value from Rm is rotated right 16 bits. ROR #24 Value from Rm is rotated right 24 bits. If ROR #n is omitted, no rotation is performed. Operation These instructions do the following: 1. Rotate the value from Rm right by 0, 8, 16 or 24 bits. 2. Extract bits from the resulting value: 3. SXTAB extracts bits[7:0] from Rm and sign extends to 32 bits. UXTAB extracts bits[7:0] from Rm and zero extends to 32 bits. SXTAH extracts bits[15:0] from Rm and sign extends to 32 bits. UXTAH extracts bits[15:0] from Rm and zero extends to 32 bits. SXTAB16 extracts bits[7:0] from Rm and sign extends to 16 bits, and extracts bits [23:16] from Rm and sign extends to 16 bits. UXTAB16 extracts bits[7:0] from Rm and zero extends to 16 bits, and extracts bits [23:16] from Rm and zero extends to 16 bits. Adds the signed or zero extended value to the word or corresponding halfword of Rn and writes the result in Rd. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 173 Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the flags. Examples SXTAH UXTAB 174 R4, R8, R6, ROR #16 ; ; ; R3, R4, R10 ; ; SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Rotates R6 right by 16 bits, obtains bottom halfword, sign extends to 32 bits, adds R8,and writes to R4 Extracts bottom byte of R10 and zero extends to 32 bits, adds R4, and writes to R3. 12.6.9 Bitfield Instructions The table below shows the instructions that operate on adjacent sets of bits in registers or bitfields. Table 12-24. Packing and Unpacking Instructions Mnemonic Description BFC Bit Field Clear BFI Bit Field Insert SBFX Signed Bit Field Extract SXTB Sign extend a byte SXTH Sign extend a halfword UBFX Unsigned Bit Field Extract UXTB Zero extend a byte UXTH Zero extend a halfword SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 175 12.6.9.1 BFC and BFI Bit Field Clear and Bit Field Insert. Syntax BFC{cond} Rd, #lsb, #width BFI{cond} Rd, Rn, #lsb, #width where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the source register. lsb is the position of the least significant bit of the bitfield. lsb must be in the range 0 to 31. width is the width of the bitfield and must be in the range 1 to 32-lsb. Operation BFC clears a bitfield in a register. It clears width bits in Rd, starting at the low bit position lsb. Other bits in Rd are unchanged. BFI copies a bitfield into one register from another register. It replaces width bits in Rd starting at the low bit position lsb, with width bits from Rn starting at bit[0]. Other bits in Rd are unchanged. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the flags. Examples BFC BFI 176 R4, #8, #12 R9, R2, #8, #12 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ; Clear bit 8 to bit 19 (12 bits) of R4 to 0 ; Replace bit 8 to bit 19 (12 bits) of R9 with ; bit 0 to bit 11 from R2. 12.6.9.2 SBFX and UBFX Signed Bit Field Extract and Unsigned Bit Field Extract. Syntax SBFX{cond} Rd, Rn, #lsb, #width UBFX{cond} Rd, Rn, #lsb, #width where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rn is the source register. lsb is the position of the least significant bit of the bitfield. lsb must be in the range 0 to 31. width is the width of the bitfield and must be in the range 1 to 32-lsb. Operation SBFX extracts a bitfield from one register, sign extends it to 32 bits, and writes the result to the destination register. UBFX extracts a bitfield from one register, zero extends it to 32 bits, and writes the result to the destination register. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the flags. Examples SBFX UBFX R0, R1, #20, #4 ; ; R8, R11, #9, #10 ; ; Extract bit 20 to bit 23 (4 bits) from R1 and sign extend to 32 bits and then write the result to R0. Extract bit 9 to bit 18 (10 bits) from R11 and zero extend to 32 bits and then write the result to R8. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 177 12.6.9.3 SXT and UXT Sign extend and Zero extend. Syntax SXTextend{cond} {Rd,} Rm {, ROR #n} UXTextend{cond} {Rd}, Rm {, ROR #n} where: extend is one of: B Extends an 8-bit value to a 32-bit value. H Extends a 16-bit value to a 32-bit value. cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. Rm is the register holding the value to extend. ROR #n is one of: ROR #8 Value from Rm is rotated right 8 bits. ROR #16 Value from Rm is rotated right 16 bits. ROR #24 Value from Rm is rotated right 24 bits. If ROR #n is omitted, no rotation is performed. Operation These instructions do the following: 1. Rotate the value from Rm right by 0, 8, 16 or 24 bits. 2. Extract bits from the resulting value: SXTB extracts bits[7:0] and sign extends to 32 bits. UXTB extracts bits[7:0] and zero extends to 32 bits. SXTH extracts bits[15:0] and sign extends to 32 bits. UXTH extracts bits[15:0] and zero extends to 32 bits. Restrictions Do not use SP and do not use PC. Condition Flags These instructions do not affect the flags. Examples 178 SXTH R4, R6, ROR #16 UXTB R3, R10 ; ; ; ; ; Rotate R6 right by 16 bits, then obtain the lower halfword of the result and then sign extend to 32 bits and write the result to R4. Extract lowest byte of the value in R10 and zero extend it, and write the result to R3. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.10 Branch and Control Instructions The table below shows the branch and control instructions. Table 12-25. Branch and Control Instructions Mnemonic Description B Branch BL Branch with Link BLX Branch indirect with Link BX Branch indirect CBNZ Compare and Branch if Non Zero CBZ Compare and Branch if Zero IT If-Then TBB Table Branch Byte TBH Table Branch Halfword SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 179 12.6.10.1 B, BL, BX, and BLX Branch instructions. Syntax B{cond} label BL{cond} label BX{cond} Rm BLX{cond} Rm where: B is branch (immediate). BL is branch with link (immediate). BX is branch indirect (register). BLX is branch indirect with link (register). cond is an optional condition code, see "Conditional Execution" . label is a PC-relative expression. See "PC-relative Expressions" . Rm is a register that indicates an address to branch to. Bit[0] of the value in Rm must be 1, but the address to branch to is created by changing bit[0] to 0. Operation All these instructions cause a branch to label, or to the address indicated in Rm. In addition: The BL and BLX instructions write the address of the next instruction to LR (the link register, R14). The BX and BLX instructions result in a UsageFault exception if bit[0] of Rm is 0. Bcond label is the only conditional instruction that can be either inside or outside an IT block. All other branch instructions must be conditional inside an IT block, and must be unconditional outside the IT block, see "IT" . The table below shows the ranges for the various branch instructions. Table 12-26. Branch Ranges Instruction Branch Range B label -16 MB to +16 MB Bcond label (outside IT block) -1 MB to +1 MB Bcond label (inside IT block) -16 MB to +16 MB BL{cond} label -16 MB to +16 MB BX{cond} Rm Any value in register BLX{cond} Rm Any value in register The .W suffix might be used to get the maximum branch range. See "Instruction Width Selection" . Restrictions The restrictions are: Do not use PC in the BLX instruction For BX and BLX, bit[0] of Rm must be 1 for correct execution but a branch occurs to the target address created by changing bit[0] to 0 When any of these instructions is inside an IT block, it must be the last instruction of the IT block. Bcond is the only conditional instruction that is not required to be inside an IT block. However, it has a longer branch range when it is inside an IT block. 180 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Condition Flags These instructions do not change the flags. Examples B BLE B.W BEQ BEQ.W BL loopA ng target target target funC BX BXNE BLX LR R0 R0 ; ; ; ; ; ; ; ; ; ; Branch to loopA Conditionally branch to label ng Branch to target within 16MB range Conditionally branch to target Conditionally branch to target within 1MB Branch with link (Call) to function funC, return address stored in LR Return from function call Conditionally branch to address stored in R0 Branch with link and exchange (Call) to a address stored in R0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 181 12.6.10.2 CBZ and CBNZ Compare and Branch on Zero, Compare and Branch on Non-Zero. Syntax CBZ Rn, label CBNZ Rn, label where: Rn is the register holding the operand. label is the branch destination. Operation Use the CBZ or CBNZ instructions to avoid changing the condition code flags and to reduce the number of instructions. CBZ Rn, label does not change condition flags but is otherwise equivalent to: CMP Rn, #0 BEQ label CBNZ Rn, label does not change condition flags but is otherwise equivalent to: CMP Rn, #0 BNE label Restrictions The restrictions are: Rn must be in the range of R0 to R7 The branch destination must be within 4 to 130 bytes after the instruction These instructions must not be used inside an IT block. Condition Flags These instructions do not change the flags. Examples CBZ CBNZ 182 R5, target R0, target SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ; Forward branch if R5 is zero ; Forward branch if R0 is not zero 12.6.10.3 IT If-Then condition instruction. Syntax IT{x{y{z}}} cond where: x specifies the condition switch for the second instruction in the IT block. y specifies the condition switch for the third instruction in the IT block. z specifies the condition switch for the fourth instruction in the IT block. cond specifies the condition for the first instruction in the IT block. The condition switch for the second, third and fourth instruction in the IT block can be either: T Then. Applies the condition cond to the instruction. E Else. Applies the inverse condition of cond to the instruction. It is possible to use AL (the always condition) for cond in an IT instruction. If this is done, all of the instructions in the IT block must be unconditional, and each of x, y, and z must be T or omitted but not E. Operation The IT instruction makes up to four following instructions conditional. The conditions can be all the same, or some of them can be the logical inverse of the others. The conditional instructions following the IT instruction form the IT block. The instructions in the IT block, including any branches, must specify the condition in the {cond} part of their syntax. The assembler might be able to generate the required IT instructions for conditional instructions automatically, so that the user does not have to write them. See the assembler documentation for details. A BKPT instruction in an IT block is always executed, even if its condition fails. Exceptions can be taken between an IT instruction and the corresponding IT block, or within an IT block. Such an exception results in entry to the appropriate exception handler, with suitable return information in LR and stacked PSR. Instructions designed for use for exception returns can be used as normal to return from the exception, and execution of the IT block resumes correctly. This is the only way that a PC-modifying instruction is permitted to branch to an instruction in an IT block. Restrictions The following instructions are not permitted in an IT block: IT CBZ and CBNZ CPSID and CPSIE. Other restrictions when using an IT block are: A branch or any instruction that modifies the PC must either be outside an IT block or must be the last instruction inside the IT block. These are: ADD PC, PC, Rm MOV PC, Rm B, BL, BX, BLX Any LDM, LDR, or POP instruction that writes to the PC TBB and TBH Do not branch to any instruction inside an IT block, except when returning from an exception handler SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 183 All conditional instructions except Bcond must be inside an IT block. Bcond can be either outside or inside an IT block but has a larger branch range if it is inside one Each instruction inside the IT block must specify a condition code suffix that is either the same or logical inverse as for the other instructions in the block. Your assembler might place extra restrictions on the use of IT blocks, such as prohibiting the use of assembler directives within them. Condition Flags This instruction does not change the flags. Example 12.6.10.4 ITTE ANDNE ADDSNE MOVEQ NE R0, R0, R1 R2, R2, #1 R2, R3 ; ; ; ; Next 3 instructions are conditional ANDNE does not update condition flags ADDSNE updates condition flags Conditional move CMP R0, #9 ITE ADDGT ADDLE GT R1, R0, #55 R1, R0, #48 ; ; ; ; ; Convert R0 hex value (0 to 15) into ASCII ('0'-'9', 'A'-'F') Next 2 instructions are conditional Convert 0xA -> 'A' Convert 0x0 -> '0' IT ADDGT GT R1, R1, #1 ; IT block with only one conditional instruction ; Increment R1 conditionally ITTEE MOVEQ ADDEQ ANDNE BNE.W EQ R0, R1 R2, R2, #10 R3, R3, #1 dloop ; ; ; ; ; ; IT ADD NE R0, R0, R1 ; Next instruction is conditional ; Syntax error: no condition code used in IT block Next 4 instructions are conditional Conditional move Conditional add Conditional AND Branch instruction can only be used in the last instruction of an IT block TBB and TBH Table Branch Byte and Table Branch Halfword. Syntax TBB [Rn, Rm] TBH [Rn, Rm, LSL #1] where: Rn is the register containing the address of the table of branch lengths. If Rn is PC, then the address of the table is the address of the byte immediately following the TBB or TBH instruction. Rm 184 is the index register. This contains an index into the table. For halfword tables, LSL #1 doubles the value in Rm to form the right offset into the table. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Operation These instructions cause a PC-relative forward branch using a table of single byte offsets for TBB, or halfword offsets for TBH. Rn provides a pointer to the table, and Rm supplies an index into the table. For TBB the branch offset is twice the unsigned value of the byte returned from the table. and for TBH the branch offset is twice the unsigned value of the halfword returned from the table. The branch occurs to the address at that offset from the address of the byte immediately after the TBB or TBH instruction. Restrictions The restrictions are: Rn must not be SP Rm must not be SP and must not be PC When any of these instructions is used inside an IT block, it must be the last instruction of the IT block. Condition Flags These instructions do not change the flags. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 185 Examples ADR.W TBB R0, BranchTable_Byte [R0, R1] ; R1 is the index, R0 is the base address of the ; branch table Case1 ; an instruction sequence follows Case2 ; an instruction sequence follows Case3 ; an instruction sequence follows BranchTable_Byte DCB 0 ; Case1 offset calculation DCB ((Case2-Case1)/2) ; Case2 offset calculation DCB ((Case3-Case1)/2) ; Case3 offset calculation TBH [PC, R1, LSL #1] ; R1 is the index, PC is used as base of the ; branch table BranchTable_H DCI ((CaseA - BranchTable_H)/2) DCI ((CaseB - BranchTable_H)/2) DCI ((CaseC - BranchTable_H)/2) CaseA ; an instruction sequence follows CaseB ; an instruction sequence follows CaseC ; an instruction sequence follows 186 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ; CaseA offset calculation ; CaseB offset calculation ; CaseC offset calculation 12.6.11 Miscellaneous Instructions The table below shows the remaining Cortex-M4 instructions. Table 12-27. Miscellaneous Instructions Mnemonic Description BKPT Breakpoint CPSID Change Processor State, Disable Interrupts CPSIE Change Processor State, Enable Interrupts DMB Data Memory Barrier DSB Data Synchronization Barrier ISB Instruction Synchronization Barrier MRS Move from special register to register MSR Move from register to special register NOP No Operation SEV Send Event SVC Supervisor Call WFE Wait For Event WFI Wait For Interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 187 12.6.11.1 BKPT Breakpoint. Syntax BKPT #imm where: imm is an expression evaluating to an integer in the range 0-255 (8-bit value). Operation The BKPT instruction causes the processor to enter Debug state. Debug tools can use this to investigate system state when the instruction at a particular address is reached. imm is ignored by the processor. If required, a debugger can use it to store additional information about the breakpoint. The BKPT instruction can be placed inside an IT block, but it executes unconditionally, unaffected by the condition specified by the IT instruction. Condition Flags This instruction does not change the flags. Examples BKPT 0xAB Note: 12.6.11.2 ; Breakpoint with immediate value set to 0xAB (debugger can ; extract the immediate value by locating it using the PC) ARM does not recommend the use of the BKPT instruction with an immediate value set to 0xAB for any purpose other than Semi-hosting. CPS Change Processor State. Syntax CPSeffect iflags where: effect is one of: IE Clears the special purpose register. ID Sets the special purpose register. iflags is a sequence of one or more flags: i Set or clear PRIMASK. f Set or clear FAULTMASK. Operation CPS changes the PRIMASK and FAULTMASK special register values. See "Exception Mask Registers" for more information about these registers. Restrictions The restrictions are: 188 Use CPS only from privileged software, it has no effect if used in unprivileged software CPS cannot be conditional and so must not be used inside an IT block. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Condition Flags This instruction does not change the condition flags. Examples CPSID CPSID CPSIE CPSIE 12.6.11.3 i f i f ; ; ; ; Disable interrupts and configurable fault handlers (set PRIMASK) Disable interrupts and all fault handlers (set FAULTMASK) Enable interrupts and configurable fault handlers (clear PRIMASK) Enable interrupts and fault handlers (clear FAULTMASK) DMB Data Memory Barrier. Syntax DMB{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation DMB acts as a data memory barrier. It ensures that all explicit memory accesses that appear, in program order, before the DMB instruction are completed before any explicit memory accesses that appear, in program order, after the DMB instruction. DMB does not affect the ordering or execution of instructions that do not access memory. Condition Flags This instruction does not change the flags. Examples DMB ; Data Memory Barrier SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 189 12.6.11.4 DSB Data Synchronization Barrier. Syntax DSB{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation DSB acts as a special data synchronization memory barrier. Instructions that come after the DSB, in program order, do not execute until the DSB instruction completes. The DSB instruction completes when all explicit memory accesses before it complete. Condition Flags This instruction does not change the flags. Examples DSB ; Data Synchronisation Barrier 12.6.11.5 ISB Instruction Synchronization Barrier. Syntax ISB{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation ISB acts as an instruction synchronization barrier. It flushes the pipeline of the processor, so that all instructions following the ISB are fetched from cache or memory again, after the ISB instruction has been completed. Condition Flags This instruction does not change the flags. Examples ISB 190 ; Instruction Synchronisation Barrier SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.11.6 MRS Move the contents of a special register to a general-purpose register. Syntax MRS{cond} Rd, spec_reg where: cond is an optional condition code, see "Conditional Execution" . Rd is the destination register. spec_reg can be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP, PRIMASK, BASEPRI, BASEPRI_MAX, FAULTMASK, or CONTROL. Operation Use MRS in combination with MSR as part of a read-modify-write sequence for updating a PSR, for example to clear the Q flag. In process swap code, the programmers model state of the process being swapped out must be saved, including relevant PSR contents. Similarly, the state of the process being swapped in must also be restored. These operations use MRS in the state-saving instruction sequence and MSR in the state-restoring instruction sequence. Note: BASEPRI_MAX is an alias of BASEPRI when used with the MRS instruction. See "MSR" . Restrictions Rd must not be SP and must not be PC. Condition Flags This instruction does not change the flags. Examples MRS 12.6.11.7 R0, PRIMASK ; Read PRIMASK value and write it to R0 MSR Move the contents of a general-purpose register into the specified special register. Syntax MSR{cond} spec_reg, Rn where: cond is an optional condition code, see "Conditional Execution" . Rn is the source register. spec_reg can be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP, PRIMASK, BASEPRI, BASEPRI_MAX, FAULTMASK, or CONTROL. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 191 Operation The register access operation in MSR depends on the privilege level. Unprivileged software can only access the APSR. See "Application Program Status Register" . Privileged software can access all special registers. In unprivileged software writes to unallocated or execution state bits in the PSR are ignored. Note: When the user writes to BASEPRI_MAX, the instruction writes to BASEPRI only if either: Rn is non-zero and the current BASEPRI value is 0 Rn is non-zero and less than the current BASEPRI value. See "MRS" . Restrictions Rn must not be SP and must not be PC. Condition Flags This instruction updates the flags explicitly based on the value in Rn. Examples MSR 12.6.11.8 CONTROL, R1 ; Read R1 value and write it to the CONTROL register NOP No Operation. Syntax NOP{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation NOP does nothing. NOP is not necessarily a time-consuming NOP. The processor might remove it from the pipeline before it reaches the execution stage. Use NOP for padding, for example to place the following instruction on a 64-bit boundary. Condition Flags This instruction does not change the flags. Examples NOP 192 ; No operation SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.6.11.9 SEV Send Event. Syntax SEV{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation SEV is a hint instruction that causes an event to be signaled to all processors within a multiprocessor system. It also sets the local event register to 1, see "Power Management" . Condition Flags This instruction does not change the flags. Examples SEV ; Send Event 12.6.11.10 SVC Supervisor Call. Syntax SVC{cond} #imm where: cond is an optional condition code, see "Conditional Execution" . imm is an expression evaluating to an integer in the range 0-255 (8-bit value). Operation The SVC instruction causes the SVC exception. imm is ignored by the processor. If required, it can be retrieved by the exception handler to determine what service is being requested. Condition Flags This instruction does not change the flags. Examples SVC 0x32 ; Supervisor Call (SVC handler can extract the immediate value ; by locating it via the stacked PC) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 193 12.6.11.11 WFE Wait For Event. Syntax WFE{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation WFE is a hint instruction. If the event register is 0, WFE suspends execution until one of the following events occurs: An exception, unless masked by the exception mask registers or the current priority level An exception enters the Pending state, if SEVONPEND in the System Control Register is set A Debug Entry request, if Debug is enabled An event signaled by a peripheral or another processor in a multiprocessor system using the SEV instruction. If the event register is 1, WFE clears it to 0 and returns immediately. For more information, see "Power Management" . Condition Flags This instruction does not change the flags. Examples WFE 12.6.11.12 ; Wait for event WFI Wait for Interrupt. Syntax WFI{cond} where: cond is an optional condition code, see "Conditional Execution" . Operation WFI is a hint instruction that suspends execution until one of the following events occurs: An exception A Debug Entry request, regardless of whether Debug is enabled. Condition Flags This instruction does not change the flags. Examples WFI ; Wait for interrupt 194 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.7 Cortex-M4 Core Peripherals 12.7.1 Peripherals Nested Vectored Interrupt Controller (NVIC) The Nested Vectored Interrupt Controller (NVIC) is an embedded interrupt controller that supports low latency interrupt processing. See Section 12.8 "Nested Vectored Interrupt Controller (NVIC)". System Control Block (SCB) The System Control Block (SCB) is the programmers model interface to the processor. It provides system implementation information and system control, including configuration, control, and reporting of system exceptions. See Section 12.9 "System Control Block (SCB)". System Timer (SysTick) The System Timer, SysTick, is a 24-bit count-down timer. Use this as a Real Time Operating System (RTOS) tick timer or as a simple counter. See Section 12.10 "System Timer (SysTick)". Memory Protection Unit (MPU) The Memory Protection Unit (MPU) improves system reliability by defining the memory attributes for different memory regions. It provides up to eight different regions, and an optional predefined background region. See Section 12.11 "Memory Protection Unit (MPU)". 12.7.2 Address Map The address map of the Private peripheral bus (PPB) is given in the following table. Table 12-28. Core Peripheral Register Regions Address Core Peripheral 0xE000E008-0xE000E00F System Control Block 0xE000E010-0xE000E01F System Timer 0xE000E100-0xE000E4EF Nested Vectored Interrupt Controller 0xE000ED00-0xE000ED3F System control block 0xE000ED90-0xE000EDB8 Memory Protection Unit 0xE000EF00-0xE000EF03 Nested Vectored Interrupt Controller In register descriptions: The required privilege gives the privilege level required to access the register, as follows: Privileged: Only privileged software can access the register. Unprivileged: Both unprivileged and privileged software can access the register. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 195 12.8 Nested Vectored Interrupt Controller (NVIC) This section describes the NVIC and the registers it uses. The NVIC supports: Up to 35 interrupts A programmable priority level of 0-15 for each interrupt. A higher level corresponds to a lower priority, so level 0 is the highest interrupt priority. Level detection of interrupt signals Dynamic reprioritization of interrupts Grouping of priority values into group priority and subpriority fields Interrupt tail-chaining An external Non-maskable interrupt (NMI) The processor automatically stacks its state on exception entry and unstacks this state on exception exit, with no instruction overhead. This provides low latency exception handling. 12.8.1 Level-sensitive Interrupts The processor supports level-sensitive interrupts. A level-sensitive interrupt is held asserted until the peripheral deasserts the interrupt signal. Typically, this happens because the ISR accesses the peripheral, causing it to clear the interrupt request. When the processor enters the ISR, it automatically removes the pending state from the interrupt (see "Hardware and Software Control of Interrupts" ). For a level-sensitive interrupt, if the signal is not deasserted before the processor returns from the ISR, the interrupt becomes pending again, and the processor must execute its ISR again. This means that the peripheral can hold the interrupt signal asserted until it no longer requires servicing. 12.8.1.1 Hardware and Software Control of Interrupts The Cortex-M4 latches all interrupts. A peripheral interrupt becomes pending for one of the following reasons: The NVIC detects that the interrupt signal is HIGH and the interrupt is not active The NVIC detects a rising edge on the interrupt signal A software writes to the corresponding interrupt set-pending register bit, see "Interrupt Set-pending Registers" , or to the NVIC_STIR to make an interrupt pending, see "Software Trigger Interrupt Register" . A pending interrupt remains pending until one of the following: The processor enters the ISR for the interrupt. This changes the state of the interrupt from pending to active. Then: For a level-sensitive interrupt, when the processor returns from the ISR, the NVIC samples the interrupt signal. If the signal is asserted, the state of the interrupt changes to pending, which might cause the processor to immediately re-enter the ISR. Otherwise, the state of the interrupt changes to inactive. Software writes to the corresponding interrupt clear-pending register bit. For a level-sensitive interrupt, if the interrupt signal is still asserted, the state of the interrupt does not change. Otherwise, the state of the interrupt changes to inactive. 12.8.2 NVIC Design Hints and Tips Ensure that the software uses correctly aligned register accesses. The processor does not support unaligned accesses to NVIC registers. See the individual register descriptions for the supported access sizes. A interrupt can enter a pending state even if it is disabled. Disabling an interrupt only prevents the processor from taking that interrupt. 196 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Before programming SCB_VTOR to relocate the vector table, ensure that the vector table entries of the new vector table are set up for fault handlers, NMI and all enabled exception like interrupts. For more information, see the "Vector Table Offset Register" . 12.8.2.1 NVIC Programming Hints The software uses the CPSIE I and CPSID I instructions to enable and disable the interrupts. The CMSIS provides the following intrinsic functions for these instructions: void __disable_irq(void) // Disable Interrupts void __enable_irq(void) // Enable Interrupts In addition, the CMSIS provides a number of functions for NVIC control, including: Table 12-29. CMSIS Functions for NVIC Control CMSIS Interrupt Control Function Description void NVIC_SetPriorityGrouping(uint32_t priority_grouping) Set the priority grouping void NVIC_EnableIRQ(IRQn_t IRQn) Enable IRQn void NVIC_DisableIRQ(IRQn_t IRQn) Disable IRQn uint32_t NVIC_GetPendingIRQ (IRQn_t IRQn) Return true (IRQ-Number) if IRQn is pending void NVIC_SetPendingIRQ (IRQn_t IRQn) Set IRQn pending void NVIC_ClearPendingIRQ (IRQn_t IRQn) Clear IRQn pending status uint32_t NVIC_GetActive (IRQn_t IRQn) Return the IRQ number of the active interrupt void NVIC_SetPriority (IRQn_t IRQn, uint32_t priority) Set priority for IRQn uint32_t NVIC_GetPriority (IRQn_t IRQn) Read priority of IRQn void NVIC_SystemReset (void) Reset the system The input parameter IRQn is the IRQ number. For more information about these functions, see the CMSIS documentation. To improve software efficiency, the CMSIS simplifies the NVIC register presentation. In the CMSIS: The Set-enable, Clear-enable, Set-pending, Clear-pending and Active Bit registers map to arrays of 32-bit integers, so that: The array ISER[0] to ISER[1] corresponds to the registers ISER0-ISER1 The array ICER[0] to ICER[1] corresponds to the registers ICER0-ICER1 The array ISPR[0] to ISPR[1] corresponds to the registers ISPR0-ISPR1 The array ICPR[0] to ICPR[1] corresponds to the registers ICPR0-ICPR1 The array IABR[0] to IABR[1] corresponds to the registers IABR0-IABR1 The Interrupt Priority Registers (IPR0-IPR8) provide an 8-bit priority field for each interrupt and each register holds four priority fields. The CMSIS provides thread-safe code that gives atomic access to the Interrupt Priority Registers. Table 12-30 shows how the interrupts, or IRQ numbers, map onto the interrupt registers and corresponding CMSIS variables that have one bit per interrupt. Table 12-30. Mapping of Interrupts CMSIS Array Elements (1) Interrupts Set-enable Clear-enable Set-pending Clear-pending Active Bit 0-31 ISER[0] ICER[0] ISPR[0] ICPR[0] IABR[0] 32-35 ISER[1] ICER[1] ISPR[1] ICPR[1] IABR[1] SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 197 Note: 198 1. Each array element corresponds to a single NVIC register, for example the ICER[0] element corresponds to the ICER0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.8.3 Nested Vectored Interrupt Controller (NVIC) User Interface Table 12-31. Nested Vectored Interrupt Controller (NVIC) Register Mapping Offset Register Name Access Reset 0xE000E100 Interrupt Set-enable Register 0 NVIC_ISER0 Read/Write 0x00000000 ... ... ... ... ... 0xE000E11C Interrupt Set-enable Register 7 NVIC_ISER7 Read/Write 0x00000000 0XE000E180 Interrupt Clear-enable Register 0 NVIC_ICER0 Read/Write 0x00000000 ... ... ... ... ... 0xE000E19C Interrupt Clear-enable Register 7 NVIC_ICER7 Read/Write 0x00000000 0XE000E200 Interrupt Set-pending Register 0 NVIC_ISPR0 Read/Write 0x00000000 ... ... ... ... ... 0xE000E21C Interrupt Set-pending Register 7 NVIC_ISPR7 Read/Write 0x00000000 0XE000E280 Interrupt Clear-pending Register 0 NVIC_ICPR0 Read/Write 0x00000000 ... ... ... ... ... 0xE000E29C Interrupt Clear-pending Register 7 NVIC_ICPR7 Read/Write 0x00000000 0xE000E300 Interrupt Active Bit Register 0 NVIC_IABR0 Read/Write 0x00000000 ... ... ... ... ... 0xE000E31C Interrupt Active Bit Register 7 NVIC_IABR7 Read/Write 0x00000000 0xE000E400 Interrupt Priority Register 0 NVIC_IPR0 Read/Write 0x00000000 ... ... ... ... ... 0xE000E420 Interrupt Priority Register 8 NVIC_IPR8 Read/Write 0x00000000 0xE000EF00 Software Trigger Interrupt Register NVIC_STIR Write-only 0x00000000 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 199 12.8.3.1 Interrupt Set-enable Registers Name: NVIC_ISERx [x=0..7] Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 SETENA 23 22 21 20 SETENA 15 14 13 12 SETENA 7 6 5 4 SETENA These registers enable interrupts and show which interrupts are enabled. * SETENA: Interrupt Set-enable Write: 0: No effect. 1: Enables the interrupt. Read: 0: Interrupt disabled. 1: Interrupt enabled. Notes: 200 1. If a pending interrupt is enabled, the NVIC activates the interrupt based on its priority. 2. If an interrupt is not enabled, asserting its interrupt signal changes the interrupt state to pending, the NVIC never activates the interrupt, regardless of its priority. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.8.3.2 Interrupt Clear-enable Registers Name: NVIC_ICERx [x=0..7] Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 CLRENA 23 22 21 20 CLRENA 15 14 13 12 CLRENA 7 6 5 4 CLRENA These registers disable interrupts, and show which interrupts are enabled. * CLRENA: Interrupt Clear-enable Write: 0: No effect. 1: Disables the interrupt. Read: 0: Interrupt disabled. 1: Interrupt enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 201 12.8.3.3 Interrupt Set-pending Registers Name: NVIC_ISPRx [x=0..7] Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 SETPEND 23 22 21 20 SETPEND 15 14 13 12 SETPEND 7 6 5 4 SETPEND These registers force interrupts into the pending state, and show which interrupts are pending. * SETPEND: Interrupt Set-pending Write: 0: No effect. 1: Changes the interrupt state to pending. Read: 0: Interrupt is not pending. 1: Interrupt is pending. Notes: 202 1. Writing a 1 to an ISPR bit corresponding to an interrupt that is pending has no effect. 2. Writing a 1 to an ISPR bit corresponding to a disabled interrupt sets the state of that interrupt to pending. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.8.3.4 Interrupt Clear-pending Registers Name: NVIC_ICPRx [x=0..7] Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 CLRPEND 23 22 21 20 CLRPEND 15 14 13 12 CLRPEND 7 6 5 4 CLRPEND These registers remove the pending state from interrupts, and show which interrupts are pending. * CLRPEND: Interrupt Clear-pending Write: 0: No effect. 1: Removes the pending state from an interrupt. Read: 0: Interrupt is not pending. 1: Interrupt is pending. Note: Writing a 1 to an ICPR bit does not affect the active state of the corresponding interrupt. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 203 12.8.3.5 Interrupt Active Bit Registers Name: NVIC_IABRx [x=0..7] Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ACTIVE 23 22 21 20 ACTIVE 15 14 13 12 ACTIVE 7 6 5 4 ACTIVE These registers indicate which interrupts are active. * ACTIVE: Interrupt Active Flags 0: Interrupt is not active. 1: Interrupt is active. Note: A bit reads as one if the status of the corresponding interrupt is active, or active and pending. 204 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.8.3.6 Interrupt Priority Registers Name: NVIC_IPRx [x=0..8] Access: Read/Write Reset: 0x000000000 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 PRI3 23 22 21 20 PRI2 15 14 13 12 PRI1 7 6 5 4 PRI0 The NVIC_IPR0-NVIC_IPR8 registers provide a 8-bit priority field for each interrupt. These registers are byte-accessible. Each register holds four priority fields that map up to four elements in the CMSIS interrupt priority array IP[0] to IP[34]. * PRI3: Priority (4m+3) Priority, Byte Offset 3, refers to register bits [31:24]. * PRI2: Priority (4m+2) Priority, Byte Offset 2, refers to register bits [23:16]. * PRI1: Priority (4m+1) Priority, Byte Offset 1, refers to register bits [15:8]. * PRI0: Priority (4m) Priority, Byte Offset 0, refers to register bits [7:0]. Notes: 1. Each priority field holds a priority value, 0-15. The lower the value, the greater the priority of the corresponding interrupt. The processor implements only bits[7:4] of each field; bits[3:0] read as zero and ignore writes. 2. For more information about the IP[0] to IP[34] interrupt priority array, that provides the software view of the interrupt priorities, see Table 12-29, "CMSIS Functions for NVIC Control" . 3. The corresponding IPR number n is given by n = m DIV 4. 4. The byte offset of the required Priority field in this register is m MOD 4. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 205 12.8.3.7 Software Trigger Interrupt Register Name: NVIC_STIR Access: Write-only Reset: 0x000000000 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 INTID 7 6 5 4 3 2 1 0 INTID Write to this register to generate an interrupt from the software. * INTID: Interrupt ID Interrupt ID of the interrupt to trigger, in the range 0-239. For example, a value of 0x03 specifies interrupt IRQ3. 206 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9 System Control Block (SCB) The System Control Block (SCB) provides system implementation information, and system control. This includes configuration, control, and reporting of the system exceptions. Ensure that the software uses aligned accesses of the correct size to access the system control block registers: Except for the SCB_CFSR and SCB_SHPR1-SCB_SHPR3 registers, it must use aligned word accesses For the SCB_CFSR and SCB_SHPR1-SCB_SHPR3 registers, it can use byte or aligned halfword or word accesses. The processor does not support unaligned accesses to system control block registers. In a fault handler, to determine the true faulting address: 1. Read and save the MMFAR or SCB_BFAR value. 2. Read the MMARVALID bit in the MMFSR subregister, or the BFARVALID bit in the BFSR subregister. The SCB_MMFAR or SCB_BFAR address is valid only if this bit is 1. The software must follow this sequence because another higher priority exception might change the SCB_MMFAR or SCB_BFAR value. For example, if a higher priority handler preempts the current fault handler, the other fault might change the SCB_MMFAR or SCB_BFAR value. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 207 12.9.1 System Control Block (SCB) User Interface Table 12-32. System Control Block (SCB) Register Mapping Offset Register Name Access Reset 0xE000E008 Auxiliary Control Register SCB_ACTLR Read/Write 0x00000000 0xE000ED00 CPUID Base Register SCB_CPUID Read-only 0x410FC240 0xE000ED04 Interrupt Control and State Register SCB_ICSR Read/Write(1) 0x00000000 0xE000ED08 Vector Table Offset Register SCB_VTOR Read/Write 0x00000000 0xE000ED0C Application Interrupt and Reset Control Register SCB_AIRCR Read/Write 0xFA050000 0xE000ED10 System Control Register SCB_SCR Read/Write 0x00000000 0xE000ED14 Configuration and Control Register SCB_CCR Read/Write 0x00000200 0xE000ED18 System Handler Priority Register 1 SCB_SHPR1 Read/Write 0x00000000 0xE000ED1C System Handler Priority Register 2 SCB_SHPR2 Read/Write 0x00000000 0xE000ED20 System Handler Priority Register 3 SCB_SHPR3 Read/Write 0x00000000 0xE000ED24 System Handler Control and State Register SCB_SHCSR Read/Write 0x00000000 (2) Read/Write 0x00000000 0xE000ED28 Configurable Fault Status Register SCB_CFSR 0xE000ED2C HardFault Status Register SCB_HFSR Read/Write 0x00000000 0xE000ED34 MemManage Fault Address Register SCB_MMFAR Read/Write Unknown 0xE000ED38 BusFault Address Register SCB_BFAR Read/Write Unknown 0xE000ED3C Auxiliary Fault Status Register SCB_AFSR Read/Write 0x00000000 Notes: 208 1. See the register description for more information. 2. This register contains the subregisters: "MMFSR: Memory Management Fault Status Subregister" (0xE000ED28 - 8 bits), "BFSR: Bus Fault Status Subregister" (0xE000ED29 - 8 bits), "UFSR: Usage Fault Status Subregister" (0xE000ED2A - 16 bits). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.1 Auxiliary Control Register Name: SCB_ACTLR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 DISOOFP 8 DISFPCA 7 - 6 - 5 - 4 - 3 - 2 DISFOLD 1 DISDEFWBUF 0 DISMCYCINT The SCB_ACTLR provides disable bits for the following processor functions: * IT folding * Write buffer use for accesses to the default memory map * Interruption of multi-cycle instructions. By default, this register is set to provide optimum performance from the Cortex-M4 processor, and does not normally require modification. * DISOOFP: Disable Out Of Order Floating Point Disables floating point instructions that complete out of order with respect to integer instructions. * DISFPCA: Disable FPCA Disables an automatic update of CONTROL.FPCA. * DISFOLD: Disable Folding When set to 1, disables the IT folding. Note: In some situations, the processor can start executing the first instruction in an IT block while it is still executing the IT instruction. This behavior is called IT folding, and it improves the performance. However, IT folding can cause jitter in looping. If a task must avoid jitter, set the DISFOLD bit to 1 before executing the task, to disable the IT folding. * DISDEFWBUF: Disable Default Write Buffer When set to 1, it disables the write buffer use during default memory map accesses. This causes BusFault to be precise but decreases the performance, as any store to memory must complete before the processor can execute the next instruction. This bit only affects write buffers implemented in the Cortex-M4 processor. * DISMCYCINT: Disable Multiple Cycle Interruption When set to 1, it disables the interruption of load multiple and store multiple instructions. This increases the interrupt latency of the processor, as any LDM or STM must complete before the processor can stack the current state and enter the interrupt handler. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 209 12.9.1.2 CPUID Base Register Name: SCB_CPUID Access: Read/Write 31 30 29 28 27 26 19 18 25 24 17 16 9 8 1 0 Implementer 23 22 21 20 Variant 15 14 Constant 13 12 11 10 3 2 PartNo 7 6 5 4 PartNo Revision The SCB_CPUID register contains the processor part number, version, and implementation information. * Implementer: Implementer Code 0x41: ARM. * Variant: Variant Number It is the r value in the rnpn product revision identifier: 0x0: Revision 0. * Constant: Reads as 0xF Reads as 0xF. * PartNo: Part Number of the Processor 0xC24 = Cortex-M4. * Revision: Revision Number It is the p value in the rnpn product revision identifier: 0x0: Patch 0. 210 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.3 Interrupt Control and State Register Name: SCB_ICSR Access: Read/Write 31 NMIPENDSET 30 29 28 PENDSVSET 23 - 22 ISRPENDING 21 20 15 14 13 VECTPENDING 12 7 6 4 - 5 27 PENDSVCLR 26 PENDSTSET 19 18 VECTPENDING 25 PENDSTCLR 24 - 17 16 11 RETTOBASE 10 - 9 - 8 VECTACTIVE 3 2 1 0 VECTACTIVE The SCB_ICSR provides a set-pending bit for the Non-Maskable Interrupt (NMI) exception, and set-pending and clearpending bits for the PendSV and SysTick exceptions. It indicates: * The exception number of the exception being processed, and whether there are preempted active exceptions, * The exception number of the highest priority pending exception, and whether any interrupts are pending. * NMIPENDSET: NMI Set-pending Write: PendSV set-pending bit. Write: 0: No effect. 1: Changes NMI exception state to pending. Read: 0: NMI exception is not pending. 1: NMI exception is pending. As NMI is the highest-priority exception, the processor normally enters the NMI exception handler as soon as it registers a write of 1 to this bit. Entering the handler clears this bit to 0. A read of this bit by the NMI exception handler returns 1 only if the NMI signal is reasserted while the processor is executing that handler. * PENDSVSET: PendSV Set-pending Write: 0: No effect. 1: Changes PendSV exception state to pending. Read: 0: PendSV exception is not pending. 1: PendSV exception is pending. Writing a 1 to this bit is the only way to set the PendSV exception state to pending. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 211 * PENDSVCLR: PendSV Clear-pending Write: 0: No effect. 1: Removes the pending state from the PendSV exception. * PENDSTSET: SysTick Exception Set-pending Write: 0: No effect. 1: Changes SysTick exception state to pending. Read: 0: SysTick exception is not pending. 1: SysTick exception is pending. * PENDSTCLR: SysTick Exception Clear-pending Write: 0: No effect. 1: Removes the pending state from the SysTick exception. This bit is Write-only. On a register read, its value is Unknown. * ISRPENDING: Interrupt Pending Flag (Excluding NMI and Faults) 0: Interrupt not pending. 1: Interrupt pending. * VECTPENDING: Exception Number of the Highest Priority Pending Enabled Exception 0: No pending exceptions. Nonzero: The exception number of the highest priority pending enabled exception. The value indicated by this field includes the effect of the BASEPRI and FAULTMASK registers, but not any effect of the PRIMASK register. * RETTOBASE: Preempted Active Exceptions Present or Not 0: There are preempted active exceptions to execute. 1: There are no active exceptions, or the currently-executing exception is the only active exception. * VECTACTIVE: Active Exception Number Contained 0: Thread mode. Nonzero: The exception number of the currently active exception. The value is the same as IPSR bits [8:0]. See "Interrupt Program Status Register" . Subtract 16 from this value to obtain the IRQ number required to index into the Interrupt Clear-Enable, Set-Enable, ClearPending, Set-Pending, or Priority Registers, see "Interrupt Program Status Register" . Note: When the user writes to the SCB_ICSR, the effect is unpredictable if: - Writing a 1 to the PENDSVSET bit and writing a 1 to the PENDSVCLR bit - Writing a 1 to the PENDSTSET bit and writing a 1 to the PENDSTCLR bit. 212 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.4 Vector Table Offset Register Name: SCB_VTOR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 - TBLOFF 23 22 21 20 TBLOFF 15 14 13 12 TBLOFF 7 TBLOFF 6 - 5 - 4 - The SCB_VTOR indicates the offset of the vector table base address from memory address 0x00000000. * TBLOFF: Vector Table Base Offset It contains bits [29:7] of the offset of the table base from the bottom of the memory map. Bit [29] determines whether the vector table is in the code or SRAM memory region: 0: Code. 1: SRAM. It is sometimes called the TBLBASE bit. Note: When setting TBLOFF, the offset must be aligned to the number of exception entries in the vector table. Configure the next statement to give the information required for your implementation; the statement reminds the user of how to determine the alignment requirement. The minimum alignment is 32 words, enough for up to 16 interrupts. For more interrupts, adjust the alignment by rounding up to the next power of two. For example, if 21 interrupts are required, the alignment must be on a 64-word boundary because the required table size is 37 words, and the next power of two is 64. Table alignment requirements mean that bits[6:0] of the table offset are always zero. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 213 12.9.1.5 Application Interrupt and Reset Control Register Name: SCB_AIRCR Access: Read/Write 31 30 29 28 27 VECTKEYSTAT/VECTKEY 26 25 24 23 22 21 20 19 VECTKEYSTAT/VECTKEY 18 17 16 15 ENDIANNESS 14 - 13 - 12 - 11 - 10 9 PRIGROUP 8 7 - 6 - 5 - 4 - 3 - 2 1 0 SYSRESETREQ VECTCLRACTIVE VECTRESET The SCB_AIRCR provides priority grouping control for the exception model, endian status for data accesses, and reset control of the system. To write to this register, write 0x5FA to the VECTKEY field, otherwise the processor ignores the write. * VECTKEYSTAT: Register Key (Read) Reads as 0xFA05. * VECTKEY: Register Key (Write) Writes 0x5FA to VECTKEY, otherwise the write is ignored. * ENDIANNESS: Data Endianness 0: Little-endian. 1: Big-endian. * PRIGROUP: Interrupt Priority Grouping This field determines the split of group priority from subpriority. It shows the position of the binary point that splits the PRI_n fields in the Interrupt Priority Registers into separate group priority and subpriority fields. The table below shows how the PRIGROUP value controls this split. Interrupt Priority Level Value, PRI_N[7:0] Number of PRIGROUP Binary Point (1) Group Priority Bits Subpriority Bits Group Priorities Subpriorities 0b000 bxxxxxxx.y [7:1] None 128 2 0b001 bxxxxxx.yy [7:2] [4:0] 64 4 0b010 bxxxxx.yyy [7:3] [4:0] 32 8 0b011 bxxxx.yyyy [7:4] [4:0] 16 16 0b100 bxxx.yyyyy [7:5] [4:0] 8 32 0b101 bxx.yyyyyy [7:6] [5:0] 4 64 0b110 bx.yyyyyyy [7] [6:0] 2 128 0b111 b.yyyyyyy None [7:0] 1 256 Note: 1. PRI_n[7:0] field showing the binary point. x denotes a group priority field bit, and y denotes a subpriority field bit. Determining preemption of an exception uses only the group priority field. 214 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * SYSRESETREQ: System Reset Request 0: No system reset request. 1: Asserts a signal to the outer system that requests a reset. This is intended to force a large system reset of all major components except for debug. This bit reads as 0. * VECTCLRACTIVE: Reserved for Debug use This bit reads as 0. When writing to the register, write a 0 to this bit, otherwise the behavior is unpredictable. * VECTRESET: Reserved for Debug use This bit reads as 0. When writing to the register, write a 0 to this bit, otherwise the behavior is unpredictable. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 215 12.9.1.6 System Control Register Name: SCB_SCR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 SEVONPEND 3 - 2 SLEEPDEEP 1 SLEEPONEXIT 0 - * SEVONPEND: Send Event on Pending Bit 0: Only enabled interrupts or events can wake up the processor; disabled interrupts are excluded. 1: Enabled events and all interrupts, including disabled interrupts, can wake up the processor. When an event or an interrupt enters the pending state, the event signal wakes up the processor from WFE. If the processor is not waiting for an event, the event is registered and affects the next WFE. The processor also wakes up on execution of an SEV instruction or an external event. * SLEEPDEEP: Sleep or Deep Sleep Controls whether the processor uses sleep or deep sleep as its low power mode: 0: Sleep. 1: Deep sleep. * SLEEPONEXIT: Sleep-on-exit Indicates sleep-on-exit when returning from the Handler mode to the Thread mode: 0: Do not sleep when returning to Thread mode. 1: Enter sleep, or deep sleep, on return from an ISR. Setting this bit to 1 enables an interrupt-driven application to avoid returning to an empty main application. 216 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.7 Configuration and Control Register Name: SCB_CCR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 STKALIGN 8 BFHFNMIGN 7 6 5 4 3 2 1 0 - - - DIV_0_TRP UNALIGN_TRP - NONBASETHRDE USERSETMPEND NA The SCB_CCR controls the entry to the Thread mode and enables the handlers for NMI, hard fault and faults escalated by FAULTMASK to ignore BusFaults. It also enables the division by zero and unaligned access trapping, and the access to the NVIC_STIR by unprivileged software (see "Software Trigger Interrupt Register" ). * STKALIGN: Stack Alignment Indicates the stack alignment on exception entry: 0: 4-byte aligned. 1: 8-byte aligned. On exception entry, the processor uses bit [9] of the stacked PSR to indicate the stack alignment. On return from the exception, it uses this stacked bit to restore the correct stack alignment. * BFHFNMIGN: Bus Faults Ignored Enables handlers with priority -1 or -2 to ignore data bus faults caused by load and store instructions. This applies to the hard fault and FAULTMASK escalated handlers: 0: Data bus faults caused by load and store instructions cause a lock-up. 1: Handlers running at priority -1 and -2 ignore data bus faults caused by load and store instructions. Set this bit to 1 only when the handler and its data are in absolutely safe memory. The normal use of this bit is to probe system devices and bridges to detect control path problems and fix them. * DIV_0_TRP: Division by Zero Trap Enables faulting or halting when the processor executes an SDIV or UDIV instruction with a divisor of 0: 0: Do not trap divide by 0. 1: Trap divide by 0. When this bit is set to 0, a divide by zero returns a quotient of 0. * UNALIGN_TRP: Unaligned Access Trap Enables unaligned access traps: 0: Do not trap unaligned halfword and word accesses. 1: Trap unaligned halfword and word accesses. If this bit is set to 1, an unaligned access generates a usage fault. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 217 Unaligned LDM, STM, LDRD, and STRD instructions always fault irrespective of whether UNALIGN_TRP is set to 1. * USERSETMPEND: Unprivileged Software Access Enables unprivileged software access to the NVIC_STIR, see "Software Trigger Interrupt Register" : 0: Disable. 1: Enable. * NONBASETHRDENA: Thread Mode Enable Indicates how the processor enters Thread mode: 0: The processor can enter the Thread mode only when no exception is active. 1: The processor can enter the Thread mode from any level under the control of an EXC_RETURN value, see "Exception Return" . 218 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.8 System Handler Priority Registers The SCB_SHPR1-SCB_SHPR3 registers set the priority level, 0 to 15 of the exception handlers that have configurable priority. They are byte-accessible. The system fault handlers and the priority field and register for each handler are: Table 12-33. System Fault Handler Priority Fields Handler Field Memory management fault (MemManage) PRI_4 Bus fault (BusFault) PRI_5 Usage fault (UsageFault) PRI_6 SVCall PRI_11 PendSV PRI_14 SysTick PRI_15 Register Description System Handler Priority Register 1 System Handler Priority Register 2 System Handler Priority Register 3 Each PRI_N field is 8 bits wide, but the processor implements only bits [7:4] of each field, and bits [3:0] read as zero and ignore writes. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 219 12.9.1.9 System Handler Priority Register 1 Name: SCB_SHPR1 Access: Read/Write 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 - 19 18 17 16 11 10 9 8 3 2 1 0 PRI_6 15 14 13 12 PRI_5 7 6 5 4 PRI_4 * PRI_6: Priority Priority of system handler 6, UsageFault. * PRI_5: Priority Priority of system handler 5, BusFault. * PRI_4: Priority Priority of system handler 4, MemManage. 220 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.10 System Handler Priority Register 2 Name: SCB_SHPR2 Access: Read/Write 31 30 29 28 27 26 25 24 PRI_11 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - * PRI_11: Priority Priority of system handler 11, SVCall. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 221 12.9.1.11 System Handler Priority Register 3 Name: SCB_SHPR3 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 PRI_15 23 22 21 20 PRI_14 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - * PRI_15: Priority Priority of system handler 15, SysTick exception. * PRI_14: Priority Priority of system handler 14, PendSV. 222 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.12 System Handler Control and State Register Name: SCB_SHCSR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 23 - 22 - 21 - 20 - 19 - 15 14 13 12 11 SVCALLPENDED 7 SVCALLACT 26 - 5 - 4 - 24 - 18 17 16 USGFAULTENA BUSFAULTENA MEMFAULTENA BUSFAULTPEND MEMFAULTPEND USGFAULTPEND SYSTICKACT ED ED ED 6 - 25 - 3 USGFAULTACT 10 9 8 PENDSVACT - MONITORACT 2 - 1 0 BUSFAULTACT MEMFAULTACT The SHCSR enables the system handlers, and indicates the pending status of the bus fault, memory management fault, and SVC exceptions; it also indicates the active status of the system handlers. * USGFAULTENA: Usage Fault Enable 0: Disables the exception. 1: Enables the exception. * BUSFAULTENA: Bus Fault Enable 0: Disables the exception. 1: Enables the exception. * MEMFAULTENA: Memory Management Fault Enable 0: Disables the exception. 1: Enables the exception. * SVCALLPENDED: SVC Call Pending Read: 0: The exception is not pending. 1: The exception is pending. Note: The user can write to these bits to change the pending status of the exceptions. * BUSFAULTPENDED: Bus Fault Exception Pending Read: 0: The exception is not pending. 1: The exception is pending. Note: The user can write to these bits to change the pending status of the exceptions. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 223 * MEMFAULTPENDED: Memory Management Fault Exception Pending Read: 0: The exception is not pending. 1: The exception is pending. Note: The user can write to these bits to change the pending status of the exceptions. * USGFAULTPENDED: Usage Fault Exception Pending Read: 0: The exception is not pending. 1: The exception is pending. Note: The user can write to these bits to change the pending status of the exceptions. * SYSTICKACT: SysTick Exception Active Read: 0: The exception is not active. 1: The exception is active. Note: The user can write to these bits to change the active status of the exceptions. - Caution: A software that changes the value of an active bit in this register without a correct adjustment to the stacked content can cause the processor to generate a fault exception. Ensure that the software writing to this register retains and subsequently restores the current active status. - Caution: After enabling the system handlers, to change the value of a bit in this register, the user must use a read-modify-write procedure to ensure that only the required bit is changed. * PENDSVACT: PendSV Exception Active 0: The exception is not active. 1: The exception is active. * MONITORACT: Debug Monitor Active 0: Debug monitor is not active. 1: Debug monitor is active. * SVCALLACT: SVC Call Active 0: SVC call is not active. 1: SVC call is active. * USGFAULTACT: Usage Fault Exception Active 0: Usage fault exception is not active. 1: Usage fault exception is active. * BUSFAULTACT: Bus Fault Exception Active 0: Bus fault exception is not active. 1: Bus fault exception is active. * MEMFAULTACT: Memory Management Fault Exception Active 0: Memory management fault exception is not active. 1: Memory management fault exception is active. 224 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 If the user disables a system handler and the corresponding fault occurs, the processor treats the fault as a hard fault. The user can write to this register to change the pending or active status of system exceptions. An OS kernel can write to the active bits to perform a context switch that changes the current exception type. 12.9.1.13 Configurable Fault Status Register Name: SCB_CFSR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 DIVBYZERO 24 UNALIGNED 23 - 22 - 21 - 20 - 19 NOCP 18 INVPC 17 INVSTATE 16 UNDEFINSTR 15 BFARVALID 14 - 13 12 STKERR 11 UNSTKERR 10 IMPRECISERR 9 PRECISERR 8 IBUSERR 7 MMARVALID 6 - 5 4 MSTKERR 3 MUNSTKERR 2 - 1 DACCVIOL 0 IACCVIOL - - * IACCVIOL: Instruction Access Violation Flag This is part of "MMFSR: Memory Management Fault Status Subregister" . 0: No instruction access violation fault. 1: The processor attempted an instruction fetch from a location that does not permit execution. This fault occurs on any access to an XN region, even when the MPU is disabled or not present. When this bit is 1, the PC value stacked for the exception return points to the faulting instruction. The processor has not written a fault address to the SCB_MMFAR. * DACCVIOL: Data Access Violation Flag This is part of "MMFSR: Memory Management Fault Status Subregister" . 0: No data access violation fault. 1: The processor attempted a load or store at a location that does not permit the operation. When this bit is 1, the PC value stacked for the exception return points to the faulting instruction. The processor has loaded the SCB_MMFAR with the address of the attempted access. * MUNSTKERR: Memory Manager Fault on Unstacking for a Return From Exception This is part of "MMFSR: Memory Management Fault Status Subregister" . 0: No unstacking fault. 1: Unstack for an exception return has caused one or more access violations. This fault is chained to the handler. This means that when this bit is 1, the original return stack is still present. The processor has not adjusted the SP from the failing return, and has not performed a new save. The processor has not written a fault address to the SCB_MMFAR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 225 * MSTKERR: Memory Manager Fault on Stacking for Exception Entry This is part of "MMFSR: Memory Management Fault Status Subregister" . 0: No stacking fault. 1: Stacking for an exception entry has caused one or more access violations. When this bit is 1, the SP is still adjusted but the values in the context area on the stack might be incorrect. The processor has not written a fault address to SCB_MMFAR. * MMARVALID: Memory Management Fault Address Register (SCB_MMFAR) Valid Flag This is part of "MMFSR: Memory Management Fault Status Subregister" . 0: The value in SCB_MMFAR is not a valid fault address. 1: SCB_MMFAR holds a valid fault address. If a memory management fault occurs and is escalated to a hard fault because of priority, the hard fault handler must set this bit to 0. This prevents problems on return to a stacked active memory management fault handler whose SCB_MMFAR value has been overwritten. * IBUSERR: Instruction Bus Error This is part of "BFSR: Bus Fault Status Subregister" . 0: No instruction bus error. 1: Instruction bus error. The processor detects the instruction bus error on prefetching an instruction, but it sets the IBUSERR flag to 1 only if it attempts to issue the faulting instruction. When the processor sets this bit to 1, it does not write a fault address to the BFAR. * PRECISERR: Precise Data Bus Error This is part of "BFSR: Bus Fault Status Subregister" . 0: No precise data bus error. 1: A data bus error has occurred, and the PC value stacked for the exception return points to the instruction that caused the fault. When the processor sets this bit to 1, it writes the faulting address to the SCB_BFAR. * IMPRECISERR: Imprecise Data Bus Error This is part of "BFSR: Bus Fault Status Subregister" . 0: No imprecise data bus error. 1: A data bus error has occurred, but the return address in the stack frame is not related to the instruction that caused the error. When the processor sets this bit to 1, it does not write a fault address to the SCB_BFAR. This is an asynchronous fault. Therefore, if it is detected when the priority of the current process is higher than the bus fault priority, the bus fault becomes pending and becomes active only when the processor returns from all higher priority processes. If a precise fault occurs before the processor enters the handler for the imprecise bus fault, the handler detects that both this bit and one of the precise fault status bits are set to 1. 226 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * UNSTKERR: Bus Fault on Unstacking for a Return From Exception This is part of "BFSR: Bus Fault Status Subregister" . 0: No unstacking fault. 1: Unstack for an exception return has caused one or more bus faults. This fault is chained to the handler. This means that when the processor sets this bit to 1, the original return stack is still present. The processor does not adjust the SP from the failing return, does not performed a new save, and does not write a fault address to the BFAR. * STKERR: Bus Fault on Stacking for Exception Entry This is part of "BFSR: Bus Fault Status Subregister" . 0: No stacking fault. 1: Stacking for an exception entry has caused one or more bus faults. When the processor sets this bit to 1, the SP is still adjusted but the values in the context area on the stack might be incorrect. The processor does not write a fault address to the SCB_BFAR. * BFARVALID: Bus Fault Address Register (BFAR) Valid flag This is part of "BFSR: Bus Fault Status Subregister" . 0: The value in SCB_BFAR is not a valid fault address. 1: SCB_BFAR holds a valid fault address. The processor sets this bit to 1 after a bus fault where the address is known. Other faults can set this bit to 0, such as a memory management fault occurring later. If a bus fault occurs and is escalated to a hard fault because of priority, the hard fault handler must set this bit to 0. This prevents problems if returning to a stacked active bus fault handler whose SCB_BFAR value has been overwritten. * UNDEFINSTR: Undefined Instruction Usage Fault This is part of "UFSR: Usage Fault Status Subregister" . 0: No undefined instruction usage fault. 1: The processor has attempted to execute an undefined instruction. When this bit is set to 1, the PC value stacked for the exception return points to the undefined instruction. An undefined instruction is an instruction that the processor cannot decode. * INVSTATE: Invalid State Usage Fault This is part of "UFSR: Usage Fault Status Subregister" . 0: No invalid state usage fault. 1: The processor has attempted to execute an instruction that makes illegal use of the EPSR. When this bit is set to 1, the PC value stacked for the exception return points to the instruction that attempted the illegal use of the EPSR. This bit is not set to 1 if an undefined instruction uses the EPSR. * INVPC: Invalid PC Load Usage Fault This is part of "UFSR: Usage Fault Status Subregister" . It is caused by an invalid PC load by EXC_RETURN: 0: No invalid PC load usage fault. 1: The processor has attempted an illegal load of EXC_RETURN to the PC, as a result of an invalid context, or an invalid EXC_RETURN value. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 227 When this bit is set to 1, the PC value stacked for the exception return points to the instruction that tried to perform the illegal load of the PC. * NOCP: No Coprocessor Usage Fault This is part of "UFSR: Usage Fault Status Subregister" . The processor does not support coprocessor instructions: 0: No usage fault caused by attempting to access a coprocessor. 1: The processor has attempted to access a coprocessor. * UNALIGNED: Unaligned Access Usage Fault This is part of "UFSR: Usage Fault Status Subregister" . 0: No unaligned access fault, or unaligned access trapping not enabled. 1: The processor has made an unaligned memory access. Enable trapping of unaligned accesses by setting the UNALIGN_TRP bit in the SCB_CCR to 1. See "Configuration and Control Register" . Unaligned LDM, STM, LDRD, and STRD instructions always fault irrespective of the setting of UNALIGN_TRP. * DIVBYZERO: Divide by Zero Usage Fault This is part of "UFSR: Usage Fault Status Subregister" . 0: No divide by zero fault, or divide by zero trapping not enabled. 1: The processor has executed an SDIV or UDIV instruction with a divisor of 0. When the processor sets this bit to 1, the PC value stacked for the exception return points to the instruction that performed the divide by zero. Enable trapping of divide by zero by setting the DIV_0_TRP bit in the SCB_CCR to 1. See "Configuration and Control Register" . 228 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.14 Configurable Fault Status Register (Byte Access) Name: SCB_CFSR (BYTE) Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 UFSR 23 22 21 20 UFSR 15 14 13 12 BFSR 7 6 5 4 MMFSR * MMFSR: Memory Management Fault Status Subregister The flags in the MMFSR subregister indicate the cause of memory access faults. See bitfield [7..0] description in Section 12.9.1.13. * BFSR: Bus Fault Status Subregister The flags in the BFSR subregister indicate the cause of a bus access fault. See bitfield [14..8] description in Section 12.9.1.13. * UFSR: Usage Fault Status Subregister The flags in the UFSR subregister indicate the cause of a usage fault. See bitfield [31..15] description in Section 12.9.1.13. Note: The UFSR bits are sticky. This means that as one or more fault occurs, the associated bits are set to 1. A bit that is set to 1 is cleared to 0 only by wrting a 1 to that bit, or by a reset. The SCB_CFSR indicates the cause of a memory management fault, bus fault, or usage fault. It is byte accessible. The user can access the SCB_CFSR or its subregisters as follows: * Access complete SCB_CFSR with a word access to 0xE000ED28 * Access MMFSR with a byte access to 0xE000ED28 * Access MMFSR and BFSR with a halfword access to 0xE000ED28 * Access BFSR with a byte access to 0xE000ED29 * Access UFSR with a halfword access to 0xE000ED2A. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 229 12.9.1.15 Hard Fault Status Register Name: SCB_HFSR Access: Read/Write 31 DEBUGEVT 30 FORCED 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 VECTTBL 0 - The SCB_HFSR gives information about events that activate the hard fault handler. This register is read, write to clear. This means that bits in the register read normally, but wrting a 1 to any bit clears that bit to 0. * DEBUGEVT: Reserved for Debug Use When writing to the register, write a 0 to this bit, otherwise the behavior is unpredictable. * FORCED: Forced Hard Fault It indicates a forced hard fault, generated by escalation of a fault with configurable priority that cannot be handles, either because of priority or because it is disabled: 0: No forced hard fault. 1: Forced hard fault. When this bit is set to 1, the hard fault handler must read the other fault status registers to find the cause of the fault. * VECTTBL: Bus Fault on a Vector Table It indicates a bus fault on a vector table read during an exception processing: 0: No bus fault on vector table read. 1: Bus fault on vector table read. This error is always handled by the hard fault handler. When this bit is set to 1, the PC value stacked for the exception return points to the instruction that was preempted by the exception. Note: The HFSR bits are sticky. This means that, as one or more fault occurs, the associated bits are set to 1. A bit that is set to 1 is cleared to 0 only by wrting a 1 to that bit, or by a reset. 230 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.9.1.16 MemManage Fault Address Register Name: SCB_MMFAR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ADDRESS 23 22 21 20 ADDRESS 15 14 13 12 ADDRESS 7 6 5 4 ADDRESS The SCB_MMFAR contains the address of the location that generated a memory management fault. * ADDRESS: Memory Management Fault Generation Location Address When the MMARVALID bit of the MMFSR subregister is set to 1, this field holds the address of the location that generated the memory management fault. Notes: 1. When an unaligned access faults, the address is the actual address that faulted. Because a single read or write instruction can be split into multiple aligned accesses, the fault address can be any address in the range of the requested access size. 2. Flags in the MMFSR subregister indicate the cause of the fault, and whether the value in the SCB_MMFAR is valid. See "MMFSR: Memory Management Fault Status Subregister" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 231 12.9.1.17 Bus Fault Address Register Name: SCB_BFAR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ADDRESS 23 22 21 20 ADDRESS 15 14 13 12 ADDRESS 7 6 5 4 ADDRESS The SCB_BFAR contains the address of the location that generated a bus fault. * ADDRESS: Bus Fault Generation Location Address When the BFARVALID bit of the BFSR subregister is set to 1, this field holds the address of the location that generated the bus fault. Notes: 232 1. When an unaligned access faults, the address in the SCB_BFAR is the one requested by the instruction, even if it is not the address of the fault. 2. Flags in the BFSR indicate the cause of the fault, and whether the value in the SCB_BFAR is valid. See "BFSR: Bus Fault Status Subregister" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.10 System Timer (SysTick) The processor has a 24-bit system timer, SysTick, that counts down from the reload value to zero, reloads (wraps to) the value in the SYST_RVR on the next clock edge, then counts down on subsequent clocks. When the processor is halted for debugging, the counter does not decrement. The SysTick counter runs on the processor clock. If this clock signal is stopped for low power mode, the SysTick counter stops. Ensure that the software uses aligned word accesses to access the SysTick registers. The SysTick counter reload and current value are undefined at reset; the correct initialization sequence for the SysTick counter is: 1. Program the reload value. 2. Clear the current value. 3. Program the Control and Status register. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 233 12.10.1 System Timer (SysTick) User Interface Table 12-34. System Timer (SYST) Register Mapping Offset Register Name Access Reset 0xE000E010 SysTick Control and Status Register SYST_CSR Read/Write 0x00000000 0xE000E014 SysTick Reload Value Register SYST_RVR Read/Write Unknown 0xE000E018 SysTick Current Value Register SYST_CVR Read/Write Unknown 0xE000E01C SysTick Calibration Value Register SYST_CALIB Read-only 0x000030D4 234 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.10.1.1 SysTick Control and Status Register Name: SYST_CSR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 COUNTFLAG 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 CLKSOURCE 1 TICKINT 0 ENABLE The SysTick SYST_CSR enables the SysTick features. * COUNTFLAG: Count Flag Returns 1 if the timer counted to 0 since the last time this was read. * CLKSOURCE: Clock Source Indicates the clock source: 0: External Clock. 1: Processor Clock. * TICKINT: SysTick Exception Request Enable Enables a SysTick exception request: 0: Counting down to zero does not assert the SysTick exception request. 1: Counting down to zero asserts the SysTick exception request. The software can use COUNTFLAG to determine if SysTick has ever counted to zero. * ENABLE: Counter Enable Enables the counter: 0: Counter disabled. 1: Counter enabled. When ENABLE is set to 1, the counter loads the RELOAD value from the SYST_RVR and then counts down. On reaching 0, it sets the COUNTFLAG to 1 and optionally asserts the SysTick depending on the value of TICKINT. It then loads the RELOAD value again, and begins counting. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 235 12.10.1.2 SysTick Reload Value Registers Name: SYST_RVR Access: Read/Write 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 - 19 18 17 16 11 10 9 8 3 2 1 0 RELOAD 15 14 13 12 RELOAD 7 6 5 4 RELOAD The SYST_RVR specifies the start value to load into the SYST_CVR. * RELOAD: SYST_CVR Load Value Value to load into the SYST_CVR when the counter is enabled and when it reaches 0. The RELOAD value can be any value in the range 0x00000001-0x00FFFFFF. A start value of 0 is possible, but has no effect because the SysTick exception request and COUNTFLAG are activated when counting from 1 to 0. The RELOAD value is calculated according to its use: For example, to generate a multi-shot timer with a period of N processor clock cycles, use a RELOAD value of N-1. If the SysTick interrupt is required every 100 clock pulses, set RELOAD to 99. 236 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.10.1.3 SysTick Current Value Register Name: SYST_CVR Access: Read/Write 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 - 19 18 17 16 11 10 9 8 3 2 1 0 CURRENT 15 14 13 12 CURRENT 7 6 5 4 CURRENT The SysTick SYST_CVR contains the current value of the SysTick counter. * CURRENT: SysTick Counter Current Value Reads return the current value of the SysTick counter. A write of any value clears the field to 0, and also clears the SYST_CSR.COUNTFLAG bit to 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 237 12.10.1.4 SysTick Calibration Value Register Name: SYST_CALIB Access: Read/Write 31 NOREF 30 SKEW 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 - 19 18 17 16 11 10 9 8 3 2 1 0 TENMS 15 14 13 12 TENMS 7 6 5 4 TENMS The SysTick SYST_CSR indicates the SysTick calibration properties. * NOREF: No Reference Clock It indicates whether the device provides a reference clock to the processor: 0: Reference clock provided. 1: No reference clock provided. If your device does not provide a reference clock, the SYST_CSR.CLKSOURCE bit reads-as-one and ignores writes. * SKEW: TENMS Value Verification It indicates whether the TENMS value is exact: 0: TENMS value is exact. 1: TENMS value is inexact, or not given. An inexact TENMS value can affect the suitability of SysTick as a software real time clock. * TENMS: Ten Milliseconds The reload value for 10 ms (100 Hz) timing is subject to system clock skew errors. If the value reads as zero, the calibration value is not known. The TENMS field default value is 0x000030D4 (12500 decimal). In order to achieve a 1 ms timebase on SystTick, the TENMS field must be programmed to a value corresponding to the processor clock frequency (in kHz) divided by 8. For example, for devices running the processor clock at 48 MHz, the TENMS field value must be 0x0001770 (48000 kHz/8). 238 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11 Memory Protection Unit (MPU) The MPU divides the memory map into a number of regions, and defines the location, size, access permissions, and memory attributes of each region. It supports: Independent attribute settings for each region Overlapping regions Export of memory attributes to the system. The memory attributes affect the behavior of memory accesses to the region. The Cortex-M4 MPU defines: Eight separate memory regions, 0-7 A background region. When memory regions overlap, a memory access is affected by the attributes of the region with the highest number. For example, the attributes for region 7 take precedence over the attributes of any region that overlaps region 7. The background region has the same memory access attributes as the default memory map, but is accessible from privileged software only. The Cortex-M4 MPU memory map is unified. This means that instruction accesses and data accesses have the same region settings. If a program accesses a memory location that is prohibited by the MPU, the processor generates a memory management fault. This causes a fault exception, and might cause the termination of the process in an OS environment. In an OS environment, the kernel can update the MPU region setting dynamically based on the process to be executed. Typically, an embedded OS uses the MPU for memory protection. The configuration of MPU regions is based on memory types (see "Memory Regions, Types and Attributes" ). Table 12-35 shows the possible MPU region attributes. These include Share ability and cache behavior attributes that are not relevant to most microcontroller implementations. See "MPU Configuration for a Microcontroller" for guidelines for programming such an implementation. Table 12-35. Memory Attributes Summary Memory Type Shareability Other Attributes Description Strongly-ordered - - All accesses to Strongly-ordered memory occur in program order. All Strongly-ordered regions are assumed to be shared. Shared - Memory-mapped peripherals that several processors share. Non-shared - Memory-mapped peripherals that only a single processor uses. Shared Non-cacheable Writethrough Cacheable Write-back Cacheable Normal memory that is shared between several processors. Non-shared Non-cacheable Writethrough Cacheable Write-back Cacheable Normal memory that only a single processor uses. Device Normal 12.11.1 MPU Access Permission Attributes This section describes the MPU access permission attributes. The access permission bits (TEX, C, B, S, AP, and XN) of the MPU_RASR control the access to the corresponding memory region. If an access is made to an area of memory without the required permissions, then the MPU generates a permission fault. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 239 The table below shows the encodings for the TEX, C, B, and S access permission bits. Table 12-36. TEX C 0 TEX, C, B, and S Encoding B 0 1 S Memory Type Shareability Other Attributes x (1) Strongly-ordered Shareable - x (1) Device Shareable - Normal Not shareable 0 0 b000 1 Outer and inner write-through. No write allocate. Shareable 1 Not shareable 0 1 0 Normal 1 Shareable 0 Not shareable 0 Normal 1 x (1) Reserved encoding - 0 x (1) Implementation defined attributes. - 1 Not shareable 0 1 Normal 1 Not shareable 0 x (1) Device 1 x (1) Reserved encoding - (1) Reserved encoding - x (1) x 0 b1BB A A Normal 1 Note: 1. Outer and inner write-back. Write and read allocate. Shareable 0 1 Outer and inner noncacheable. Shareable 1 b001 b010 Outer and inner write-back. No write allocate. Not shareable Nonshared Device. Cached memory BB = outer policy, AA = inner policy. Shareable The MPU ignores the value of this bit. Table 12-37 shows the cache policy for memory attribute encodings with a TEX value is in the range 4-7. Table 12-37. 240 Cache Policy for Memory Attribute Encoding Encoding, AA or BB Corresponding Cache Policy 00 Non-cacheable 01 Write back, write and read allocate 10 Write through, no write allocate 11 Write back, no write allocate SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 12-38 shows the AP encodings that define the access permissions for privileged and unprivileged software. Table 12-38. 12.11.1.1 AP Encoding AP[2:0] Privileged Permissions Unprivileged Permissions Description 000 No access No access All accesses generate a permission fault 001 RW No access Access from privileged software only 010 RW RO Writes by unprivileged software generate a permission fault 011 RW RW Full access 100 Unpredictable Unpredictable Reserved 101 RO No access Reads by privileged software only 110 RO RO Read only, by privileged or unprivileged software 111 RO RO Read only, by privileged or unprivileged software MPU Mismatch When an access violates the MPU permissions, the processor generates a memory management fault, see "Exceptions and Interrupts" . The MMFSR indicates the cause of the fault. See "MMFSR: Memory Management Fault Status Subregister" for more information. 12.11.1.2 Updating an MPU Region To update the attributes for an MPU region, update the MPU_RNR, MPU_RBAR and MPU_RASRs. Each register can be programed separately, or a multiple-word write can be used to program all of these registers. MPU_RBAR and MPU_RASR aliases can be used to program up to four regions simultaneously using an STM instruction. 12.11.1.3 Updating an MPU Region Using Separate Words Simple code to configure one region: ; R1 = region number ; R2 = size/enable ; R3 = attributes ; R4 = address LDR R0,=MPU_RNR STR R1, [R0, #0x0] STR R4, [R0, #0x4] STRH R2, [R0, #0x8] STRH R3, [R0, #0xA] ; ; ; ; ; 0xE000ED98, MPU region number register Region Number Region Base Address Region Size and Enable Region Attribute Disable a region before writing new region settings to the MPU, if the region being changed was previously enabled. For example: ; R1 = region number ; R2 = size/enable ; R3 = attributes ; R4 = address LDR R0,=MPU_RNR ; 0xE000ED98, MPU region number register STR R1, [R0, #0x0] ; Region Number BIC R2, R2, #1 ; Disable STRH R2, [R0, #0x8] ; Region Size and Enable STR R4, [R0, #0x4] ; Region Base Address STRH R3, [R0, #0xA] ; Region Attribute ORR R2, #1 ; Enable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 241 STRH R2, [R0, #0x8] ; Region Size and Enable The software must use memory barrier instructions: Before the MPU setup, if there might be outstanding memory transfers, such as buffered writes, that might be affected by the change in MPU settings After the MPU setup, if it includes memory transfers that must use the new MPU settings. However, memory barrier instructions are not required if the MPU setup process starts by entering an exception handler, or is followed by an exception return, because the exception entry and exception return mechanisms cause memory barrier behavior. The software does not need any memory barrier instructions during an MPU setup, because it accesses the MPU through the PPB, which is a Strongly-Ordered memory region. For example, if the user wants all of the memory access behavior to take effect immediately after the programming sequence, a DSB instruction and an ISB instruction must be used. A DSB is required after changing MPU settings, such as at the end of a context switch. An ISB is required if the code that programs the MPU region or regions is entered using a branch or call. If the programming sequence is entered using a return from exception, or by taking an exception, then an ISB is not required. 12.11.1.4 Updating an MPU Region Using Multi-word Writes The user can program directly using multi-word writes, depending on how the information is divided. Consider the following reprogramming: ; R1 = region number ; R2 = address ; R3 = size, attributes in one LDR R0, =MPU_RNR ; 0xE000ED98, MPU region number register STR R1, [R0, #0x0] ; Region Number STR R2, [R0, #0x4] ; Region Base Address STR R3, [R0, #0x8] ; Region Attribute, Size and Enable Use an STM instruction to optimize this: ; R1 = region number ; R2 = address ; R3 = size, attributes in one LDR R0, =MPU_RNR ; 0xE000ED98, MPU region number register STM R0, {R1-R3} ; Region Number, address, attribute, size and enable This can be done in two words for pre-packed information. This means that the MPU_RBAR contains the required region number and had the VALID bit set to 1. See "MPU Region Base Address Register" . Use this when the data is statically packed, for example in a boot loader: ; R1 = address and region number in one ; R2 = size and attributes in one LDR R0, =MPU_RBAR ; 0xE000ED9C, MPU Region Base register STR R1, [R0, #0x0] ; Region base address and ; region number combined with VALID (bit 4) set to 1 STR R2, [R0, #0x4] ; Region Attribute, Size and Enable Use an STM instruction to optimize this: ; R1 = address and region number in one ; R2 = size and attributes in one LDR R0,=MPU_RBAR ; 0xE000ED9C, MPU Region Base register 242 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 STM R0, {R1-R2} 12.11.1.5 ; Region base address, region number and VALID bit, ; and Region Attribute, Size and Enable Subregions Regions of 256 bytes or more are divided into eight equal-sized subregions. Set the corresponding bit in the SRD field of the MPU_RASR field to disable a subregion. See "MPU Region Attribute and Size Register" . The least significant bit of SRD controls the first subregion, and the most significant bit controls the last subregion. Disabling a subregion means another region overlapping the disabled range matches instead. If no other enabled region overlaps the disabled subregion, the MPU issues a fault. Regions of 32, 64, and 128 bytes do not support subregions. With regions of these sizes, the SRD field must be set to 0x00, otherwise the MPU behavior is unpredictable. 12.11.1.6 Example of SRD Use Two regions with the same base address overlap. Region 1 is 128 KB, and region 2 is 512 KB. To ensure the attributes from region 1 apply to the first 128 KB region, set the SRD field for region 2 to b00000011 to disable the first two subregions, as in Figure 12-13 below: Figure 12-13. SRD Use Region 2, with subregions Region 1 Base address of both regions 12.11.1.7 Offset from base address 512KB 448KB 384KB 320KB 256KB 192KB 128KB Disabled subregion 64KB Disabled subregion 0 MPU Design Hints And Tips To avoid unexpected behavior, disable the interrupts before updating the attributes of a region that the interrupt handlers might access. Ensure the software uses aligned accesses of the correct size to access MPU registers: Except for the MPU_RASR, it must use aligned word accesses For the MPU_RASR, it can use byte or aligned halfword or word accesses. The processor does not support unaligned accesses to MPU registers. When setting up the MPU, and if the MPU has previously been programmed, disable unused regions to prevent any previous region settings from affecting the new MPU setup. MPU Configuration for a Microcontroller Usually, a microcontroller system has only a single processor and no caches. In such a system, program the MPU as follows: Table 12-39. Memory Region Attributes for a Microcontroller Memory Region TEX C B S Memory Type and Attributes Flash memory b000 1 0 0 Normal memory, non-shareable, write-through Internal SRAM b000 1 0 1 Normal memory, shareable, write-through External SRAM b000 1 1 1 Normal memory, shareable, write-back, write-allocate Peripherals b000 0 1 1 Device memory, shareable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 243 In most microcontroller implementations, the shareability and cache policy attributes do not affect the system behavior. However, using these settings for the MPU regions can make the application code more portable. The values given are for typical situations. In special systems, such as multiprocessor designs or designs with a separate DMA engine, the shareability attribute might be important. In these cases, refer to the recommendations of the memory device manufacturer. 244 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11.2 Memory Protection Unit (MPU) User Interface Table 12-40. Memory Protection Unit (MPU) Register Mapping Offset Register Name Access Reset 0xE000ED90 MPU Type Register MPU_TYPE Read-only 0x00000800 0xE000ED94 MPU Control Register MPU_CTRL Read/Write 0x00000000 0xE000ED98 MPU Region Number Register MPU_RNR Read/Write 0x00000000 0xE000ED9C MPU Region Base Address Register MPU_RBAR Read/Write 0x00000000 0xE000EDA0 MPU Region Attribute and Size Register MPU_RASR Read/Write 0x00000000 0xE000EDA4 MPU Region Base Address Register Alias 1 MPU_RBAR_A1 Read/Write 0x00000000 0xE000EDA8 MPU Region Attribute and Size Register Alias 1 MPU_RASR_A1 Read/Write 0x00000000 0xE000EDAC MPU Region Base Address Register Alias 2 MPU_RBAR_A2 Read/Write 0x00000000 0xE000EDB0 MPU Region Attribute and Size Register Alias 2 MPU_RASR_A2 Read/Write 0x00000000 0xE000EDB4 MPU Region Base Address Register Alias 3 MPU_RBAR_A3 Read/Write 0x00000000 0xE000EDB8 MPU Region Attribute and Size Register Alias 3 MPU_RASR_A3 Read/Write 0x00000000 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 245 12.11.2.1 MPU Type Register Name: MPU_TYPE Access: Read/Write 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 - 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 SEPARATE IREGION 15 14 13 12 DREGION 7 - 6 - 5 - 4 - The MPU_TYPE register indicates whether the MPU is present, and if so, how many regions it supports. * IREGION: Instruction Region Indicates the number of supported MPU instruction regions. Always contains 0x00. The MPU memory map is unified and is described by the DREGION field. * DREGION: Data Region Indicates the number of supported MPU data regions: 0x08 = Eight MPU regions. * SEPARATE: Separate Instruction Indicates support for unified or separate instruction and date memory maps: 0: Unified. 246 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11.2.2 MPU Control Register Name: MPU_CTRL Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 PRIVDEFENA 1 HFNMIENA 0 ENABLE The MPU CTRL register enables the MPU, enables the default memory map background region, and enables the use of the MPU when in the hard fault, Non-maskable Interrupt (NMI), and FAULTMASK escalated handlers. * PRIVDEFENA: Privileged Default Memory Map Enable Enables privileged software access to the default memory map: 0: If the MPU is enabled, disables the use of the default memory map. Any memory access to a location not covered by any enabled region causes a fault. 1: If the MPU is enabled, enables the use of the default memory map as a background region for privileged software accesses. When enabled, the background region acts as a region number -1. Any region that is defined and enabled has priority over this default map. If the MPU is disabled, the processor ignores this bit. * HFNMIENA: Hard Fault and NMI Enable Enables the operation of MPU during hard fault, NMI, and FAULTMASK handlers. When the MPU is enabled: 0: MPU is disabled during hard fault, NMI, and FAULTMASK handlers, regardless of the value of the ENABLE bit. 1: The MPU is enabled during hard fault, NMI, and FAULTMASK handlers. When the MPU is disabled, if this bit is set to 1, the behavior is unpredictable. * ENABLE: MPU Enable Enables the MPU: 0: MPU disabled. 1: MPU enabled. When ENABLE and PRIVDEFENA are both set to 1: * For privileged accesses, the default memory map is as described in "Memory Model" . Any access by privileged software that does not address an enabled memory region behaves as defined by the default memory map. * Any access by unprivileged software that does not address an enabled memory region causes a memory management fault. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 247 XN and Strongly-ordered rules always apply to the System Control Space regardless of the value of the ENABLE bit. When the ENABLE bit is set to 1, at least one region of the memory map must be enabled for the system to function unless the PRIVDEFENA bit is set to 1. If the PRIVDEFENA bit is set to 1 and no regions are enabled, then only privileged software can operate. When the ENABLE bit is set to 0, the system uses the default memory map. This has the same memory attributes as if the MPU is not implemented. The default memory map applies to accesses from both privileged and unprivileged software. When the MPU is enabled, accesses to the System Control Space and vector table are always permitted. Other areas are accessible based on regions and whether PRIVDEFENA is set to 1. Unless HFNMIENA is set to 1, the MPU is not enabled when the processor is executing the handler for an exception with priority -1 or -2. These priorities are only possible when handling a hard fault or NMI exception, or when FAULTMASK is enabled. Setting the HFNMIENA bit to 1 enables the MPU when operating with these two priorities. 248 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11.2.3 MPU Region Number Register Name: MPU_RNR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 6 5 4 3 2 1 0 REGION The MPU_RNR selects which memory region is referenced by the MPU_RBAR and MPU_RASRs. * REGION: MPU Region Referenced by the MPU_RBAR and MPU_RASRs Indicates the MPU region referenced by the MPU_RBAR and MPU_RASRs. The MPU supports 8 memory regions, so the permitted values of this field are 0-7. Normally, the required region number is written to this register before accessing the MPU_RBAR or MPU_RASR. However, the region number can be changed by writing to the MPU_RBAR with the VALID bit set to 1; see "MPU Region Base Address Register" . This write updates the value of the REGION field. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 249 12.11.2.4 MPU Region Base Address Register Name: MPU_RBAR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ADDR 23 22 21 20 ADDR 15 14 13 12 ADDR 7 6 ADDR 5 4 VALID REGION The MPU_RBAR defines the base address of the MPU region selected by the MPU_RNR, and can update the value of the MPU_RNR. Write MPU_RBAR with the VALID bit set to 1 to change the current region number and update the MPU_RNR. * ADDR: Region Base Address Software must ensure that the value written to the ADDR field aligns with the size of the selected region (SIZE field in the MPU_RASR). If the region size is configured to 4 GB, in the MPU_RASR, there is no valid ADDR field. In this case, the region occupies the complete memory map, and the base address is 0x00000000. The base address is aligned to the size of the region. For example, a 64 KB region must be aligned on a multiple of 64 KB, for example, at 0x00010000 or 0x00020000. * VALID: MPU Region Number Valid Write: 0: MPU_RNR not changed, and the processor updates the base address for the region specified in the MPU_RNR, and ignores the value of the REGION field. 1: The processor updates the value of the MPU_RNR to the value of the REGION field, and updates the base address for the region specified in the REGION field. Always reads as zero. * REGION: MPU Region For the behavior on writes, see the description of the VALID field. On reads, returns the current region number, as specified by the MPU_RNR. 250 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11.2.5 MPU Region Attribute and Size Register Name: MPU_RASR Access: Read/Write 31 - 30 - 29 - 28 XN 27 - 26 25 AP 24 23 - 22 - 21 20 TEX 19 18 S 17 C 16 B 15 14 13 12 11 10 9 8 3 SIZE 2 1 0 ENABLE SRD 7 - 6 - 5 4 The MPU_RASR defines the region size and memory attributes of the MPU region specified by the MPU_RNR, and enables that region and any subregions. MPU_RASR is accessible using word or halfword accesses: * The most significant halfword holds the region attributes. * The least significant halfword holds the region size, and the region and subregion enable bits. * XN: Instruction Access Disable 0: Instruction fetches enabled. 1: Instruction fetches disabled. * AP: Access Permission See Table 12-38. * TEX, C, B: Memory Access Attributes See Table 12-36. * S: Shareable See Table 12-36. * SRD: Subregion Disable For each bit in this field: 0: Corresponding subregion is enabled. 1: Corresponding subregion is disabled. See "Subregions" for more information. Region sizes of 128 bytes and less do not support subregions. When writing the attributes for such a region, write the SRD field as 0x00. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 251 * SIZE: Size of the MPU Protection Region The minimum permitted value is 3 (b00010). The SIZE field defines the size of the MPU memory region specified by the MPU_RNR. as follows: (Region size in bytes) = 2(SIZE+1) The smallest permitted region size is 32B, corresponding to a SIZE value of 4. The table below gives an example of SIZE values, with the corresponding region size and value of N in the MPU_RBAR. SIZE Value Region Size Value of N (1) Note b00100 (4) 32 B 5 Minimum permitted size b01001 (9) 1 KB 10 - b10011 (19) 1 MB 20 - b11101 (29) 1 GB 30 - b11111 (31) 4 GB b01100 Maximum possible size Note: 1. In the MPU_RBAR; see "MPU Region Base Address Register" * ENABLE: Region Enable Note: For information about access permission, see "MPU Access Permission Attributes" . 252 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11.2.6 MPU Region Base Address Register Alias 1 Name: MPU_RBAR_A1 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ADDR 23 22 21 20 ADDR 15 14 13 12 ADDR 7 6 ADDR 5 4 VALID REGION The MPU_RBAR defines the base address of the MPU region selected by the MPU_RNR, and can update the value of the MPU_RNR. Write MPU_RBAR with the VALID bit set to 1 to change the current region number and update the MPU_RNR. * ADDR: Region Base Address Software must ensure that the value written to the ADDR field aligns with the size of the selected region. The value of N depends on the region size. The ADDR field is bits[31:N] of the MPU_RBAR. The region size, as specified by the SIZE field in the MPU_RASR, defines the value of N: N = Log2(Region size in bytes), If the region size is configured to 4 GB, in the MPU_RASR, there is no valid ADDR field. In this case, the region occupies the complete memory map, and the base address is 0x00000000. The base address is aligned to the size of the region. For example, a 64 KB region must be aligned on a multiple of 64 KB, for example, at 0x00010000 or 0x00020000. * VALID: MPU Region Number Valid Write: 0: MPU_RNR not changed, and the processor updates the base address for the region specified in the MPU_RNR, and ignores the value of the REGION field. 1: The processor updates the value of the MPU_RNR to the value of the REGION field, and updates the base address for the region specified in the REGION field. Always reads as zero. * REGION: MPU Region For the behavior on writes, see the description of the VALID field. On reads, returns the current region number, as specified by the MPU_RNR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 253 12.11.2.7 MPU Region Attribute and Size Register Alias 1 Name: MPU_RASR_A1 Access: Read/Write 31 - 23 30 - 29 - 28 XN 27 - 26 25 AP 24 22 21 20 TEX 19 18 S 17 C 16 B 14 13 12 11 10 9 8 3 SIZE 2 1 0 ENABLE - 15 SRD 7 - 6 - 5 4 The MPU_RASR defines the region size and memory attributes of the MPU region specified by the MPU_RNR, and enables that region and any subregions. MPU_RASR is accessible using word or halfword accesses: * The most significant halfword holds the region attributes. * The least significant halfword holds the region size, and the region and subregion enable bits. * XN: Instruction Access Disable 0: Instruction fetches enabled. 1: Instruction fetches disabled. * AP: Access Permission See Table 12-38. * TEX, C, B: Memory Access Attributes See Table 12-36. * S: Shareable See Table 12-36. * SRD: Subregion Disable For each bit in this field: 0: Corresponding subregion is enabled. 1: Corresponding subregion is disabled. See "Subregions" for more information. Region sizes of 128 bytes and less do not support subregions. When writing the attributes for such a region, write the SRD field as 0x00. 254 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * SIZE: Size of the MPU Protection Region The minimum permitted value is 3 (b00010). The SIZE field defines the size of the MPU memory region specified by the MPU_RNR. as follows: (Region size in bytes) = 2(SIZE+1) The smallest permitted region size is 32B, corresponding to a SIZE value of 4. The table below gives an example of SIZE values, with the corresponding region size and value of N in the MPU_RBAR. SIZE Value Region Size Value of N (1) Note b00100 (4) 32 B 5 Minimum permitted size b01001 (9) 1 KB 10 - b10011 (19) 1 MB 20 - b11101 (29) 1 GB 30 - b11111 (31) 4 GB b01100 Maximum possible size Note: 1. In the MPU_RBAR; see "MPU Region Base Address Register" * ENABLE: Region Enable Note: For information about access permission, see "MPU Access Permission Attributes" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 255 12.11.2.8 MPU Region Base Address Register Alias 2 Name: MPU_RBAR_A2 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ADDR 23 22 21 20 ADDR 15 14 13 12 ADDR 7 6 ADDR 5 4 VALID REGION The MPU_RBAR defines the base address of the MPU region selected by the MPU_RNR, and can update the value of the MPU_RNR. Write MPU_RBAR with the VALID bit set to 1 to change the current region number and update the MPU_RNR. * ADDR: Region Base Address Software must ensure that the value written to the ADDR field aligns with the size of the selected region. The value of N depends on the region size. The ADDR field is bits[31:N] of the MPU_RBAR. The region size, as specified by the SIZE field in the MPU_RASR, defines the value of N: N = Log2(Region size in bytes), If the region size is configured to 4 GB, in the MPU_RASR, there is no valid ADDR field. In this case, the region occupies the complete memory map, and the base address is 0x00000000. The base address is aligned to the size of the region. For example, a 64 KB region must be aligned on a multiple of 64 KB, for example, at 0x00010000 or 0x00020000. * VALID: MPU Region Number Valid Write: 0: MPU_RNR not changed, and the processor updates the base address for the region specified in the MPU_RNR, and ignores the value of the REGION field. 1: The processor updates the value of the MPU_RNR to the value of the REGION field, and updates the base address for the region specified in the REGION field. Always reads as zero. * REGION: MPU Region For the behavior on writes, see the description of the VALID field. On reads, returns the current region number, as specified by the MPU_RNR. 256 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11.2.9 MPU Region Attribute and Size Register Alias 2 Name: MPU_RASR_A2 Access: Read/Write 31 - 30 - 29 - 28 XN 27 - 26 25 AP 24 23 - 22 - 21 20 TEX 19 18 S 17 C 16 B 15 14 13 12 11 10 9 8 3 SIZE 2 1 0 ENABLE SRD 7 - 6 - 5 4 The MPU_RASR defines the region size and memory attributes of the MPU region specified by the MPU_RNR, and enables that region and any subregions. MPU_RASR is accessible using word or halfword accesses: * The most significant halfword holds the region attributes. * The least significant halfword holds the region size, and the region and subregion enable bits. * XN: Instruction Access Disable 0: Instruction fetches enabled. 1: Instruction fetches disabled. * AP: Access Permission See Table 12-38. * TEX, C, B: Memory Access Attributes See Table 12-36. * S: Shareable See Table 12-36. * SRD: Subregion Disable For each bit in this field: 0: Corresponding subregion is enabled. 1: Corresponding subregion is disabled. See "Subregions" for more information. Region sizes of 128 bytes and less do not support subregions. When writing the attributes for such a region, write the SRD field as 0x00. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 257 * SIZE: Size of the MPU Protection Region The minimum permitted value is 3 (b00010). The SIZE field defines the size of the MPU memory region specified by the MPU_RNR. as follows: (Region size in bytes) = 2(SIZE+1) The smallest permitted region size is 32B, corresponding to a SIZE value of 4. The table below gives an example of SIZE values, with the corresponding region size and value of N in the MPU_RBAR. SIZE Value Region Size Value of N (1) Note b00100 (4) 32 B 5 Minimum permitted size b01001 (9) 1 KB 10 - b10011 (19) 1 MB 20 - b11101 (29) 1 GB 30 - b11111 (31) 4 GB b01100 Maximum possible size Note: 1. In the MPU_RBAR; see "MPU Region Base Address Register" * ENABLE: Region Enable Note: For information about access permission, see "MPU Access Permission Attributes" . 258 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 12.11.2.10 MPU Region Base Address Register Alias 3 Name: MPU_RBAR_A3 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ADDR 23 22 21 20 ADDR 15 14 13 12 ADDR 7 6 ADDR 5 4 VALID REGION The MPU_RBAR defines the base address of the MPU region selected by the MPU_RNR, and can update the value of the MPU_RNR. Write MPU_RBAR with the VALID bit set to 1 to change the current region number and update the MPU_RNR. * ADDR: Region Base Address Software must ensure that the value written to the ADDR field aligns with the size of the selected region. The value of N depends on the region size. The ADDR field is bits[31:N] of the MPU_RBAR. The region size, as specified by the SIZE field in the MPU_RASR, defines the value of N: N = Log2(Region size in bytes), If the region size is configured to 4 GB, in the MPU_RASR, there is no valid ADDR field. In this case, the region occupies the complete memory map, and the base address is 0x00000000. The base address is aligned to the size of the region. For example, a 64 KB region must be aligned on a multiple of 64 KB, for example, at 0x00010000 or 0x00020000. * VALID: MPU Region Number Valid Write: 0: MPU_RNR not changed, and the processor updates the base address for the region specified in the MPU_RNR, and ignores the value of the REGION field. 1: The processor updates the value of the MPU_RNR to the value of the REGION field, and updates the base address for the region specified in the REGION field. Always reads as zero. * REGION: MPU Region For the behavior on writes, see the description of the VALID field. On reads, returns the current region number, as specified by the MPU_RNR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 259 12.11.2.11 MPU Region Attribute and Size Register Alias 3 Name: MPU_RASR_A3 Access: Read/Write 31 - 30 - 29 - 28 XN 27 - 26 25 AP 24 23 - 22 - 21 20 TEX 19 18 S 17 C 16 B 15 14 13 12 11 10 9 8 3 SIZE 2 1 0 ENABLE SRD 7 - 6 - 5 4 The MPU_RASR defines the region size and memory attributes of the MPU region specified by the MPU_RNR, and enables that region and any subregions. MPU_RASR is accessible using word or halfword accesses: * The most significant halfword holds the region attributes. * The least significant halfword holds the region size, and the region and subregion enable bits. * XN: Instruction Access Disable 0: Instruction fetches enabled. 1: Instruction fetches disabled. * AP: Access Permission See Table 12-38. * TEX, C, B: Memory Access Attributes See Table 12-36. * S: Shareable See Table 12-36. * SRD: Subregion Disable For each bit in this field: 0: Corresponding subregion is enabled. 1: Corresponding subregion is disabled. See "Subregions" for more information. Region sizes of 128 bytes and less do not support subregions. When writing the attributes for such a region, write the SRD field as 0x00. 260 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * SIZE: Size of the MPU Protection Region The minimum permitted value is 3 (b00010). The SIZE field defines the size of the MPU memory region specified by the MPU_RNR. as follows: (Region size in bytes) = 2(SIZE+1) The smallest permitted region size is 32B, corresponding to a SIZE value of 4. The table below gives an example of SIZE values, with the corresponding region size and value of N in the MPU_RBAR. SIZE Value Region Size Value of N (1) Note b00100 (4) 32 B 5 Minimum permitted size b01001 (9) 1 KB 10 - b10011 (19) 1 MB 20 - b11101 (29) 1 GB 30 - b11111 (31) 4 GB b01100 Maximum possible size Note: 1. In the MPU_RBAR; see "MPU Region Base Address Register" * ENABLE: Region Enable Note: For information about access permission, see "MPU Access Permission Attributes" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 261 12.12 Glossary This glossary describes some of the terms used in technical documents from ARM. Abort A mechanism that indicates to a processor that the value associated with a memory access is invalid. An abort can be caused by the external or internal memory system as a result of attempting to access invalid instruction or data memory. Aligned A data item stored at an address that is divisible by the number of bytes that defines the data size is said to be aligned. Aligned words and halfwords have addresses that are divisible by four and two respectively. The terms word-aligned and halfword-aligned therefore stipulate addresses that are divisible by four and two respectively. Banked register Base register A register that has multiple physical copies, where the state of the processor determines which copy is used. The Stack Pointer, SP (R13) is a banked register. In instruction descriptions, a register specified by a load or store instruction that is used to hold the base value for the instruction's address calculation. Depending on the instruction and its addressing mode, an offset can be added to or subtracted from the base register value to form the address that is sent to memory. See also "Index register" . Big-endian (BE) Byte ordering scheme in which bytes of decreasing significance in a data word are stored at increasing addresses in memory. See also "Byte-invariant" , "Endianness" , "Little-endian (LE)" . Big-endian memory Memory in which: a byte or halfword at a word-aligned address is the most significant byte or halfword within the word at that address, a byte at a halfword-aligned address is the most significant byte within the halfword at that address. See also "Little-endian memory" . Breakpoint A breakpoint is a mechanism provided by debuggers to identify an instruction at which program execution is to be halted. Breakpoints are inserted by the programmer to enable inspection of register contents, memory locations, variable values at fixed points in the program execution to test that the program is operating correctly. Breakpoints are removed after the program is successfully tested. 262 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Byte-invariant In a byte-invariant system, the address of each byte of memory remains unchanged when switching between little-endian and big-endian operation. When a data item larger than a byte is loaded from or stored to memory, the bytes making up that data item are arranged into the correct order depending on the endianness of the memory access. An ARM byte-invariant implementation also supports unaligned halfword and word memory accesses. It expects multi-word accesses to be word-aligned. Cache Condition field A block of on-chip or off-chip fast access memory locations, situated between the processor and main memory, used for storing and retrieving copies of often used instructions, data, or instructions and data. This is done to greatly increase the average speed of memory accesses and so improve processor performance. A four-bit field in an instruction that specifies a condition under which the instruction can execute. Conditional execution If the condition code flags indicate that the corresponding condition is true when the instruction starts executing, it executes normally. Otherwise, the instruction does nothing. Context The environment that each process operates in for a multitasking operating system. In ARM processors, this is limited to mean the physical address range that it can access in memory and the associated memory access permissions. Coprocessor A processor that supplements the main processor. Cortex-M4 does not support any coprocessors. Debugger A debugging system that includes a program, used to detect, locate, and correct software faults, together with custom hardware that supports software debugging. Direct Memory Access (DMA) An operation that accesses main memory directly, without the processor performing any accesses to the data concerned. Doubleword A 64-bit data item. The contents are taken as being an unsigned integer unless otherwise stated. Doubleword-aligned A data item having a memory address that is divisible by eight. Endianness Byte ordering. The scheme that determines the order that successive bytes of a data word are stored in memory. An aspect of the system's memory mapping. See also "Little-endian (LE)" and "Big-endian (BE)" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 263 Exception An event that interrupts program execution. When an exception occurs, the processor suspends the normal program flow and starts execution at the address indicated by the corresponding exception vector. The indicated address contains the first instruction of the handler for the exception. An exception can be an interrupt request, a fault, or a software-generated system exception. Faults include attempting an invalid memory access, attempting to execute an instruction in an invalid processor state, and attempting to execute an undefined instruction. Exception service routine See "Interrupt handler" . Exception vector See "Interrupt vector" . Flat address mapping A system of organizing memory in which each physical address in the memory space is the same as the corresponding virtual address. Halfword A 16-bit data item. Illegal instruction An instruction that is architecturally Undefined. Implementation-defined The behavior is not architecturally defined, but is defined and documented by individual implementations. Implementation-specific The behavior is not architecturally defined, and does not have to be documented by individual implementations. Used when there are a number of implementation options available and the option chosen does not affect software compatibility. Index register In some load and store instruction descriptions, the value of this register is used as an offset to be added to or subtracted from the base register value to form the address that is sent to memory. Some addressing modes optionally enable the index register value to be shifted prior to the addition or subtraction. See also "Base register" . Instruction cycle count The number of cycles that an instruction occupies the Execute stage of the pipeline. Interrupt handler A program that control of the processor is passed to when an interrupt occurs. Interrupt vector One of a number of fixed addresses in low memory, or in high memory if high vectors are configured, that contains the first instruction of the corresponding interrupt handler. 264 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Little-endian (LE) Byte ordering scheme in which bytes of increasing significance in a data word are stored at increasing addresses in memory. See also "Big-endian (BE)" , "Byte-invariant" , "Endianness" . Little-endian memory Memory in which: a byte or halfword at a word-aligned address is the least significant byte or halfword within the word at that address, a byte at a halfword-aligned address is the least significant byte within the halfword at that address. See also "Big-endian memory" . Load/store architecture A processor architecture where data-processing operations only operate on register contents, not directly on memory contents. Memory Protection Unit (MPU) Hardware that controls access permissions to blocks of memory. An MPU does not perform any address translation. Prefetching In pipelined processors, the process of fetching instructions from memory to fill up the pipeline before the preceding instructions have finished executing. Prefetching an instruction does not mean that the instruction has to be executed. Preserved Preserved by writing the same value back that has been previously read from the same field on the same processor. Read Reads are defined as memory operations that have the semantics of a load. Reads include the Thumb instructions LDM, LDR, LDRSH, LDRH, LDRSB, LDRB, and POP. Region A partition of memory space. Reserved A field in a control register or instruction format is reserved if the field is to be defined by the implementation, or produces Unpredictable results if the contents of the field are not zero. These fields are reserved for use in future extensions of the architecture or are implementation-specific. All reserved bits not used by the implementation must be written as 0 and read as 0. Thread-safe In a multi-tasking environment, thread-safe functions use safeguard mechanisms when accessing shared resources, to ensure correct operation without the risk of shared access conflicts. Thumb instruction One or two halfwords that specify an operation for a processor to perform. Thumb instructions must be halfword-aligned. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 265 Unaligned A data item stored at an address that is not divisible by the number of bytes that defines the data size is said to be unaligned. For example, a word stored at an address that is not divisible by four. Undefined Indicates an instruction that generates an Undefined instruction exception. Unpredictable One cannot rely on the behavior. Unpredictable behavior must not represent security holes. Unpredictable behavior must not halt or hang the processor, or any parts of the system. Warm reset Also known as a core reset. Initializes the majority of the processor excluding the debug controller and debug logic. This type of reset is useful if debugging features of a processor. WA See "Write-allocate (WA)" . WB See "Write-back (WB)" . Word A 32-bit data item. Write Writes are defined as operations that have the semantics of a store. Writes include the Thumb instructions STM, STR, STRH, STRB, and PUSH. Write-allocate (WA) In a write-allocate cache, a cache miss on storing data causes a cache line to be allocated into the cache. Write-back (WB) In a write-back cache, data is only written to main memory when it is forced out of the cache on line replacement following a cache miss. Otherwise, writes by the processor only update the cache. This is also known as copyback. Write buffer A block of high-speed memory, arranged as a FIFO buffer, between the data cache and main memory, whose purpose is to optimize stores to main memory. Write-through (WT) 266 In a write-through cache, data is written to main memory at the same time as the cache is updated. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 13. Debug and Test Features 13.1 Description The SAM4 series microcontrollers feature a number of complementary debug and test capabilities. The Serial Wire/JTAG Debug Port (SWJ-DP) combining a Serial Wire Debug Port (SW-DP) and JTAG Debug (JTAG-DP) port is used for standard debugging functions, such as downloading code and single-stepping through programs. It also embeds a serial wire trace. 13.2 Embedded Characteristics Debug access to all memory and registers in the system, including Cortex-M4 register bank when the core is running, halted, or held in reset Serial Wire Debug Port (SW-DP) and Serial Wire JTAG Debug Port (SWJ-DP) debug access Flash Patch and Breakpoint (FPB) unit for implementing breakpoints and code patches Data Watchpoint and Trace (DWT) unit for implementing watchpoints, data tracing, and system profiling Instrumentation Trace Macrocell (ITM) for support of printf style debugging IEEE1149.1 JTAG Boundary scan on all digital pins Figure 13-1. Debug and Test Block Diagram TMS TCK/SWCLK TDI Boundary TAP JTAGSEL SWJ-DP TDO/TRACESWO Reset and Test POR TST SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 267 13.3 Application Examples 13.3.1 Debug Environment Figure 13-2 shows a complete debug environment example. The SWJ-DP interface is used for standard debugging functions, such as downloading code and single-stepping through the program and viewing core and peripheral registers. Figure 13-2. Application Debug Environment Example Host Debugger PC SWJ-DP Emulator/Probe SWJ-DP Connector SAM4 SAM4-based Application Board 13.3.2 Test Environment Figure 13-3 shows a test environment example (JTAG Boundary scan). Test vectors are sent and interpreted by the tester. In this example, the "board in test" is designed using a number of JTAG-compliant devices. These devices can be connected to form a single scan chain. 268 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 13-3. Application Test Environment Example Test Adaptor Tester JTAG Probe JTAG Connector Chip n SAM4 Chip 2 Chip 1 SAM4-based Application Board In Test 13.4 Debug and Test Pin Description Table 13-1. Debug and Test Signal List Signal Name Function Type Active Level Input/Output Low Reset/Test NRST Microcontroller Reset TST Test Select Input SWD/JTAG TCK/SWCLK Test Clock/Serial Wire Clock Input TDI Test Data In Input TDO/TRACESWO Test Data Out/Trace Asynchronous Data Out TMS/SWDIO Test Mode Select/Serial Wire Input/Output Input JTAGSEL JTAG Selection Input Output High SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 269 13.5 Functional Description 13.5.1 Test Pin One dedicated pin, TST, is used to define the device operating mode. When this pin is at low level during powerup, the device is in normal operating mode. When at high level, the device is in test mode or FFPI mode. The TST pin integrates a permanent pull-down resistor of about 15 kW,so that it can be left unconnected for normal operation. Note that when setting the TST pin to low or high level at power up, it must remain in the same state during the duration of the whole operation. 13.5.2 Debug Architecture Figure 13-4 shows the Debug Architecture used in the SAM4. The Cortex-M4 embeds five functional units for debug: SWJ-DP (Serial Wire/JTAG Debug Port) FPB (Flash Patch Breakpoint) DWT (Data Watchpoint and Trace) ITM (Instrumentation Trace Macrocell) TPIU (Trace Port Interface Unit) The debug architecture information that follows is mainly dedicated to developers of SWJ-DP Emulators/Probes and debugging tool vendors for Cortex-M4 based microcontrollers. For further details on SWJ-DP see the CortexM4 technical reference manual. Figure 13-4. Debug Architecture DWT 4 watchpoints FPB SWJ-DP PC sampler 6 breakpoints data address sampler SWD/JTAG data sampler ITM software trace 32 channels interrupt trace SWO trace TPIU time stamping CPU statistics 13.5.3 Serial Wire/JTAG Debug Port (SWJ-DP) The Cortex-M4 embeds a SWJ-DP Debug port which is the standard CoreSight debug port. It combines Serial Wire Debug Port (SW-DP), from 2 to 3 pins and JTAG debug Port (JTAG-DP), 5 pins. By default, the JTAG Debug Port is active. If the host debugger wants to switch to the Serial Wire Debug Port, it must provide a dedicated JTAG sequence on TMS/SWDIO and TCK/SWCLK which disables JTAG-DP and enables SW-DP. 270 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 When the Serial Wire Debug Port is active, TDO/TRACESWO can be used for trace. The asynchronous TRACE output (TRACESWO) is multiplexed with TDO. So the asynchronous trace can only be used with SW-DP, not JTAG-DP. Table 13-2. SWJ-DP Pin List Pin Name JTAG Port Serial Wire Debug Port TMS/SWDIO TMS SWDIO TCK/SWCLK TCK SWCLK TDI TDI - TDO/TRACESWO TDO TRACESWO (optional: trace) SW-DP or JTAG-DP mode is selected when JTAGSEL is low. It is not possible to switch directly between SWJ-DP and JTAG boundary scan operations. A chip reset must be performed after JTAGSEL is changed. 13.5.3.1 SW-DP and JTAG-DP Selection Mechanism Debug port selection mechanism is done by sending specific SWDIOTMS sequence. The JTAG-DP is selected by default after reset. Switch from JTAG-DP to SW-DP. The sequence is: Send more than 50 SWCLKTCK cycles with SWDIOTMS = 1 Send the 16-bit sequence on SWDIOTMS = 0111100111100111 (0x79E7 MSB first) Send more than 50 SWCLKTCK cycles with SWDIOTMS = 1 Switch from SWD to JTAG. The sequence is: Send more than 50 SWCLKTCK cycles with SWDIOTMS = 1 Send the 16-bit sequence on SWDIOTMS = 0011110011100111 (0x3CE7 MSB first) Send more than 50 SWCLKTCK cycles with SWDIOTMS = 1 13.5.4 FPB (Flash Patch Breakpoint) The FPB: Implements hardware breakpoints Patches code and data from code space to system space. The FPB unit contains: Two literal comparators for matching against literal loads from Code space, and remapping to a corresponding area in System space. Six instruction comparators for matching against instruction fetches from Code space and remapping to a corresponding area in System space. Alternatively, comparators can also be configured to generate a Breakpoint instruction to the processor core on a match. 13.5.5 DWT (Data Watchpoint and Trace) The DWT contains four comparators which can be configured to generate the following: PC sampling packets at set intervals PC or Data watchpoint packets Watchpoint event to halt core SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 271 The DWT contains counters for the items that follow: Clock cycle (CYCCNT) Folded instructions Load Store Unit (LSU) operations Sleep Cycles CPI (all instruction cycles except for the first cycle) Interrupt overhead 13.5.6 ITM (Instrumentation Trace Macrocell) The ITM is an application driven trace source that supports printf style debugging to trace Operating System (OS) and application events, and emits diagnostic system information. The ITM emits trace information as packets which can be generated by three different sources with several priority levels: Software trace: Software can write directly to ITM stimulus registers. This can be done thanks to the "printf" function. For more information, refer to Section 13.5.6.1 "How to Configure the ITM". Hardware trace: The ITM emits packets generated by the DWT. Time stamping: Timestamps are emitted relative to packets. The ITM contains a 21-bit counter to generate the timestamp. 13.5.6.1 How to Configure the ITM The following example describes how to output trace data in asynchronous trace mode. Configure the TPIU for asynchronous trace mode (refer to Section 13.5.6.3 "5.4.3. How to Configure the TPIU") Enable the write accesses into the ITM registers by writing "0xC5ACCE55" into the Lock Access Register (Address: 0xE0000FB0) Write 0x00010015 into the Trace Control Register: Enable ITM Enable Synchronization packets Enable SWO behavior Fix the ATB ID to 1 Write 0x1 into the Trace Enable Register: Enable the Stimulus port 0 Write 0x1 into the Trace Privilege Register: Stimulus port 0 only accessed in privileged mode (Clearing a bit in this register will result in the corresponding stimulus port being accessible in user mode.) Write into the Stimulus port 0 register: TPIU (Trace Port Interface Unit) The TPIU acts as a bridge between the on-chip trace data and the Instruction Trace Macrocell (ITM). The TPIU formats and transmits trace data off-chip at frequencies asynchronous to the core. 13.5.6.2 Asynchronous Mode The TPIU is configured in asynchronous mode, trace data are output using the single TRACESWO pin. The TRACESWO signal is multiplexed with the TDO signal of the JTAG Debug Port. As a consequence, asynchronous trace mode is only available when the Serial Wire Debug mode is selected since TDO signal is used in JTAG debug mode. Two encoding formats are available for the single pin output: 272 Manchester encoded stream. This is the reset value. NRZ_based UART byte structure SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 13.5.6.3 5.4.3. How to Configure the TPIU This example only concerns the asynchronous trace mode. Set the TRCENA bit to 1 into the Debug Exception and Monitor Register (0xE000EDFC) to enable the use of trace and debug blocks. Write 0x2 into the Selected Pin Protocol Register Select the Serial Wire Output - NRZ Write 0x100 into the Formatter and Flush Control Register Set the suitable clock prescaler value into the Async Clock Prescaler Register to scale the baud rate of the asynchronous output (this can be done automatically by the debugging tool). 13.5.7 IEEE(R) 1149.1 JTAG Boundary Scan IEEE 1149.1 JTAG Boundary Scan allows pin-level access independent of the device packaging technology. IEEE 1149.1 JTAG Boundary Scan is enabled when TST is tied to low, while JTAGSEL is high during power-up, and must be kept in this state during the whole boundary scan operation. The SAMPLE, EXTEST and BYPASS functions are implemented. In SWD/JTAG debug mode, the ARM processor responds with a non-JTAG chip ID that identifies the processor. This is not IEEE 1149.1 JTAG-compliant. It is not possible to switch directly between JTAG Boundary Scan and SWJ Debug Port operations. A chip reset must be performed after JTAGSEL is changed. A Boundary-scan Descriptor Language (BSDL) file is provided on Atmel's web site to set up the test. 13.5.7.1 JTAG Boundary-scan Register The Boundary-scan Register (BSR) contains a number of bits which correspond to active pins and associated control signals. Each SAM4 input/output pin corresponds to a 3-bit register in the BSR. The OUTPUT bit contains data that can be forced on the pad. The INPUT bit facilitates the observability of data applied to the pad. The CONTROL bit selects the direction of the pad. For more information, please refer to BDSL files available for the SAM4 Series. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 273 13.5.8 ID Code Register Access: Read-only 31 30 29 28 27 21 20 19 PART NUMBER VERSION 23 22 15 14 13 PART NUMBER 7 6 5 12 11 4 3 MANUFACTURER IDENTITY 26 25 PART NUMBER 24 18 16 17 10 9 MANUFACTURER IDENTITY 2 1 * VERSION[31:28]: Product Version Number Set to 0x0. * PART NUMBER[27:12]: Product Part Number Chip Name Chip ID SAM4S 0x05B32 * MANUFACTURER IDENTITY[11:1] Set to 0x01F. * Bit[0] Required by IEEE Std. 1149.1. Set to 0x1. 274 Chip Name JTAG ID Code SAM4S 0x05B3203F SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 8 0 1 14. Reset Controller (RSTC) 14.1 Description The Reset Controller (RSTC), based on power-on reset cells, handles all the resets of the system without any external components. It reports which reset occurred last. The Reset Controller also drives independently or simultaneously the external reset and the peripheral and processor resets. 14.2 Embedded Characteristics Management of All System Resets, Including Processor Reset Processor Peripheral Set Reset Based on Embedded Power-on Cell Reset Source Status 14.3 External Devices through the NRST Pin Status of the Last Reset Either Software Reset, User Reset, Watchdog Reset External Reset Signal Shaping Block Diagram Figure 14-1. Reset Controller Block Diagram Reset Controller core_backup_reset rstc_irq vddcore_nreset user_reset NRST nrst_out NRST Manager Reset State Manager proc_nreset periph_nreset exter_nreset WDRPROC wd_fault SLCK SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 275 14.4 Functional Description 14.4.1 Reset Controller Overview The Reset Controller is made up of an NRST manager and a reset state manager. It runs at slow clock and generates the following reset signals: proc_nreset: processor reset line (also resets the Watchdog Timer) periph_nreset: affects the whole set of embedded peripherals nrst_out: drives the NRST pin These reset signals are asserted by the Reset Controller, either on events generated by peripherals, events on NRST pin, or on software action. The reset state manager controls the generation of reset signals and provides a signal to the NRST manager when an assertion of the NRST pin is required. The NRST manager shapes the NRST assertion during a programmable time, thus controlling external device resets. The Reset Controller Mode Register (RSTC_MR), used to configure the Reset Controller, is powered with VDDIO, so that its configuration is saved as long as VDDIO is on. 14.4.2 NRST Manager The NRST manager samples the NRST input pin and drives this pin low when required by the reset state manager. Figure 14-2 shows the block diagram of the NRST manager. Figure 14-2. NRST Manager RSTC_MR URSTIEN RSTC_SR URSTS NRSTL rstc_irq RSTC_MR URSTEN Other interrupt sources user_reset NRST RSTC_MR ERSTL nrst_out 14.4.2.1 External Reset Timer exter_nreset NRST Signal or Interrupt The NRST manager samples the NRST pin at slow clock speed. When the line is detected low, a User Reset is reported to the reset state manager. However, the NRST manager can be programmed to not trigger a reset when an assertion of NRST occurs. Writing a 0 to the URSTEN bit in the RSTC_MR disables the User Reset trigger. The level of the pin NRST can be read at any time in the bit NRSTL (NRST level) in the Reset Controller Status Register (RSTC_SR). As soon as the NRST pin is asserted, bit URSTS in the RSTC_SR is set. This bit is cleared only when the RSTC_SR is read. The Reset Controller can also be programmed to generate an interrupt instead of generating a reset. To do so, set the URSTIEN bit in the RSTC_MR. 276 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 14.4.2.2 NRST External Reset Control The reset state manager asserts the signal exter_nreset to assert the NRST pin. When this occurs, the "nrst_out" signal is driven low by the NRST manager for a time programmed by field ERSTL in the RSTC_MR. This assertion duration, named External Reset Length, lasts 2(ERSTL+1) slow clock cycles. This gives the approximate duration of an assertion between 60 s and 2 seconds. Note that ERSTL at 0 defines a two-cycle duration for the NRST pulse. This feature allows the Reset Controller to shape the NRST pin level, and thus to guarantee that the NRST line is driven low for a time compliant with potential external devices connected on the system reset. RSTC_MR is backed up, making it possible to use the ERSTL field to shape the system power-up reset for devices requiring a longer startup time than that of the slow clock oscillator. 14.4.3 Reset States The reset state manager handles the different reset sources and generates the internal reset signals. It reports the reset status in field RSTTYP of the Status Register (RSTC_SR). The update of RSTC_SR.RSTTYP is performed when the processor reset is released. 14.4.3.1 General Reset A general reset occurs when a VDDIO power-on-reset is detected, a brownout or a voltage regulation loss is detected by the Supply Controller. The vddcore_nreset signal is asserted by the Supply Controller when a general reset occurs. All the reset signals are released and field RSTC_SR.RSTTYP reports a general reset. As the RSTC_MR is reset, the NRST line rises two cycles after the vddcore_nreset, as ERSTL defaults at value 0x0. Figure 14-3 shows how the general reset affects the reset signals. Figure 14-3. General Reset State SLCK Any Freq. MCK vddio_nreset Processor Startup = 2 cycles proc_nreset RSTTYP XXX 0x0 = General Reset XXX periph_nreset NRST (nrst_out) External Reset Length = 2 cycles 14.4.3.2 Backup Reset A backup reset occurs when the chip exits from Backup mode. While exiting Backup mode, the vddcore_nreset signal is asserted by the Supply Controller. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 277 Field RSTC_SR.RSTTYP is updated to report a backup reset. 14.4.3.3 Watchdog Reset The watchdog reset is entered when a watchdog fault occurs. This reset lasts three slow clock cycles. When in watchdog reset, assertion of the reset signals depends on the WDRPROC bit in the WDT_MR: If WDRPROC = 0, the processor reset and the peripheral reset are asserted. The NRST line is also asserted, depending on how field RSTC_MR.ERSTL is programmed. However, the resulting low level on NRST does not result in a user reset state. If WDRPROC = 1, only the processor reset is asserted. The Watchdog Timer is reset by the proc_nreset signal. As the watchdog fault always causes a processor reset if WDRSTEN in the WDT_MR is set, the Watchdog Timer is always reset after a watchdog reset, and the Watchdog is enabled by default and with a period set to a maximum. When bit WDT_MR.WDRSTEN is reset, the watchdog fault has no impact on the Reset Controller. Figure 14-4. Watchdog Reset SLCK MCK Any Freq. wd_fault Processor Startup = 2 cycles proc_nreset RSTTYP Any XXX 0x2 = Watchdog Reset periph_nreset Only if WDRPROC = 0 NRST (nrst_out) EXTERNAL RESET LENGTH 8 cycles (ERSTL=2) 14.4.3.4 Software Reset The Reset Controller offers commands to assert the different reset signals. These commands are performed by writing the Control Register (RSTC_CR) with the following bits at 1: 278 RSTC_CR.PROCRST: Writing a 1 to PROCRST resets the processor and the watchdog timer. RSTC_CR.PERRST: Writing a 1 to PERRST resets all the embedded peripherals including the memory system, and, in particular, the Remap Command. The Peripheral Reset is generally used for debug purposes. Except for debug purposes, PERRST must always be used in conjunction with PROCRST (PERRST and PROCRST set both at 1 simultaneously). RSTC_CR.EXTRST: Writing a 1 to EXTRST asserts low the NRST pin during a time defined by the field RSTC_MR.ERSTL. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The software reset is entered if at least one of these bits is set by the software. All these commands can be performed independently or simultaneously. The software reset lasts three slow clock cycles. The internal reset signals are asserted as soon as the register write is performed. This is detected on the Master Clock (MCK). They are released when the software reset has ended, i.e., synchronously to SLCK. If EXTRST is set, the nrst_out signal is asserted depending on the configuration of field RSTC_MR.ERSTL. However, the resulting falling edge on NRST does not lead to a user reset. If and only if the PROCRST bit is set, the Reset Controller reports the software status in field RSTC_SR.RSTTYP. Other software resets are not reported in RSTTYP. As soon as a software operation is detected, the bit SRCMP (Software Reset Command in Progress) is set in the RSTC_SR. SRCMP is cleared at the end of the software reset. No other software reset can be performed while the SRCMP bit is set, and writing any value in the RSTC_CR has no effect. Figure 14-5. Software Reset SLCK MCK Any Freq. Write RSTC_CR Resynch. Processor Startup 1 cycle = 2 cycles proc_nreset if PROCRST=1 RSTTYP Any XXX 0x3 = Software Reset periph_nreset if PERRST=1 NRST (nrst_out) if EXTRST=1 EXTERNAL RESET LENGTH 8 cycles (ERSTL=2) SRCMP in RSTC_SR 14.4.3.5 User Reset The user reset is entered when a low level is detected on the NRST pin and bit URSTEN in the RSTC_MR is at 1. The NRST input signal is resynchronized with SLCK to insure proper behavior of the system. The user reset is entered as soon as a low level is detected on NRST. The processor reset and the peripheral reset are asserted. The user reset ends when NRST rises, after a two-cycle resynchronization time and a three-cycle processor startup. The processor clock is re-enabled as soon as NRST is confirmed high. When the processor reset signal is released, field RSTC_SR.RSTTYP is loaded with the value 0x4, indicating a user reset. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 279 The NRST manager guarantees that the NRST line is asserted for External Reset Length slow clock cycles, as programmed in field RSTC_MR.ERSTL. However, if NRST does not rise after External Reset Length because it is driven low externally, the internal reset lines remain asserted until NRST actually rises. Figure 14-6. User Reset State SLCK Any Freq. MCK NRST Resynch. 2 cycles Resynch. 2 cycles Processor Startup = 2 cycles proc_nreset RSTTYP Any XXX 0x4 = User Reset periph_nreset NRST (nrst_out) >= EXTERNAL RESET LENGTH 14.4.4 Reset State Priorities The reset state manager manages the priorities among the different reset sources. The resets are listed in order of priority as follows: 1. General reset 2. Backup reset 3. Watchdog reset 4. Software reset 5. User reset Particular cases are listed below: When in user reset: A watchdog event is impossible because the Watchdog Timer is being reset by the proc_nreset signal. 280 A software reset is impossible, since the processor reset is being activated. When in software reset: A watchdog event has priority over the current state. The NRST has no effect. When in watchdog reset: The processor reset is active and so a software reset cannot be programmed. A user reset cannot be entered. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 14.5 Reset Controller (RSTC) User Interface Table 14-1. Offset Note: Register Mapping Register Name Access Reset 0x00 Control Register RSTC_CR Write-only - 0x04 Status Register RSTC_SR Read-only 0x0000_0000(1) 0x08 Mode Register RSTC_MR Read/Write 0x0000 0001 1. This value assumes that a general reset has been performed, subject to change if other types of reset are generated. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 281 14.5.1 Reset Controller Control Register Name: RSTC_CR Address: 0x400E1400 Access: Write-only 31 30 29 28 27 26 25 24 KEY 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 EXTRST 2 PERRST 1 - 0 PROCRST * PROCRST: Processor Reset 0: No effect 1: If KEY is correct, resets the processor * PERRST: Peripheral Reset 0: No effect 1: If KEY is correct, resets the peripherals * EXTRST: External Reset 0: No effect 1: If KEY is correct, asserts the NRST pin * KEY: System Reset Key 282 Value Name Description 0xA5 PASSWD Writing any other value in this field aborts the write operation. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 14.5.2 Reset Controller Status Register Name: RSTC_SR Address: 0x400E1404 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 SRCMP 16 NRSTL 15 - 14 - 13 - 12 - 11 - 10 9 RSTTYP 8 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 URSTS * URSTS: User Reset Status A high-to-low transition of the NRST pin sets the URSTS bit. This transition is also detected on the MCK rising edge. If the user reset is disabled (URSTEN = 0 in RSTC_MR) and if the interruption is enabled by the URSTIEN bit in the RSTC_MR, the URSTS bit triggers an interrupt. Reading the RSTC_SR resets the URSTS bit and clears the interrupt. 0: No high-to-low edge on NRST happened since the last read of RSTC_SR. 1: At least one high-to-low transition of NRST has been detected since the last read of RSTC_SR. * RSTTYP: Reset Type This field reports the cause of the last processor reset. Reading this RSTC_SR does not reset this field. Value Name Description 0 GENERAL_RST First power-up reset 1 BACKUP_RST Return from Backup Mode 2 WDT_RST Watchdog fault occurred 3 SOFT_RST Processor reset required by the software 4 USER_RST NRST pin detected low 5 - Reserved 6 - Reserved 7 - Reserved * NRSTL: NRST Pin Level This bit registers the NRST pin level sampled on each Master Clock (MCK) rising edge. * SRCMP: Software Reset Command in Progress When set, this bit indicates that a software reset command is in progress and that no further software reset should be performed until the end of the current one. This bit is automatically cleared at the end of the current software reset. 0: No software command is being performed by the Reset Controller. The Reset Controller is ready for a software command. 1: A software reset command is being performed by the Reset Controller. The Reset Controller is busy. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 283 14.5.3 Reset Controller Mode Register Name: RSTC_MR Address: 0x400E1408 Access: Read/Write 31 30 29 28 27 26 25 24 17 - 16 - 9 8 1 - 0 URSTEN KEY 23 - 22 - 21 - 20 - 19 - 18 - 15 - 14 - 13 - 12 - 11 10 7 - 6 - 5 - 4 URSTIEN 3 - ERSTL 2 - This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_WPMR). * URSTEN: User Reset Enable 0: The detection of a low level on the NRST pin does not generate a user reset. 1: The detection of a low level on the NRST pin triggers a user reset. * URSTIEN: User Reset Interrupt Enable 0: USRTS bit in RSTC_SR at 1 has no effect on rstc_irq. 1: USRTS bit in RSTC_SR at 1 asserts rstc_irq if URSTEN = 0. * ERSTL: External Reset Length This field defines the external reset length. The external reset is asserted during a time of 2(ERSTL+1) slow clock cycles. This allows assertion duration to be programmed between 60 s and 2 seconds. Note that synchronization cycles must also be considered when calculating the actual reset length as previously described. * KEY: Write Access Password 284 Value Name 0xA5 PASSWD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Description Writing any other value in this field aborts the write operation. Always reads as 0. 15. Real-time Timer (RTT) 15.1 Description The Real-time Timer (RTT) is built around a 32-bit counter used to count roll-over events of the programmable 16bit prescaler driven from the 32-kHz slow clock source. It generates a periodic interrupt and/or triggers an alarm on a programmed value. The RTT can also be configured to be driven by the 1Hz RTC signal, thus taking advantage of a calibrated 1Hz clock. The slow clock source can be fully disabled to reduce power consumption when only an elapsed seconds count is required. 15.2 15.3 Embedded Characteristics 32-bit Free-running Counter on prescaled slow clock or RTC calibrated 1Hz clock 16-bit Configurable Prescaler Interrupt on Alarm or Counter Increment Block Diagram Figure 15-1. RTT_MR RTTDIS Real-time Timer RTT_MR RTT_MR RTTRST RTPRES RTT_MR reload 16-bit Prescaler SLCK RTTINCIEN set 0 RTT_MR RTC 1Hz RTTRST RTT_MR RTC1HZ 1 RTTINC RTT_SR 1 reset 0 rtt_int 0 32-bit Counter read RTT_SR RTT_MR ALMIEN RTT_VR reset CRTV RTT_SR ALMS set rtt_alarm = RTT_AR ALMV SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 285 15.4 Functional Description The programmable 16-bit prescaler value can be configured through the RTPRES field in the "Real-time Timer Mode Register" (RTT_MR). Configuring the RTPRES field value to 0x8000 (default value) corresponds to feeding the real-time counter with a 1Hz signal (if the slow clock is 32.768 kHz). The 32-bit counter can count up to 232 seconds, corresponding to more than 136 years, then roll over to 0. Bit RTTINC in the "Real-time Timer Status Register" (RTT_SR) is set each time there is a prescaler roll-over (see Figure 15-2) The real-time 32-bit counter can also be supplied by the 1Hz RTC clock. This mode is interesting when the RTC 1Hz is calibrated (CORRECTION field 0 in RTC_MR) in order to guaranty the synchronism between RTC and RTT counters. Setting the RTC1HZ bit in the RTT_MR drives the 32-bit RTT counter from the 1Hz RTC clock. In this mode, the RTPRES field has no effect on the 32-bit counter. The prescaler roll-over generates an increment of the real-time timer counter if RTC1HZ = 0. Otherwise, if RTC1HZ = 1, the real-time timer counter is incremented every second. The RTTINC bit is set independently from the 32-bit counter increment. The real-time timer can also be used as a free-running timer with a lower time-base. The best accuracy is achieved by writing RTPRES to 3 in RTT_MR. Programming RTPRES to 1 or 2 is forbidden. If the RTT is configured to trigger an interrupt, the interrupt occurs two slow clock cycles after reading the RTT_SR. To prevent several executions of the interrupt handler, the interrupt must be disabled in the interrupt handler and re-enabled when the RTT_SR is cleared. The CRTV field can be read at any time in the "Real-time Timer Value Register" (RTT_VR). As this value can be updated asynchronously with the Master Clock, the CRTV field must be read twice at the same value to read a correct value. The current value of the counter is compared with the value written in the "Real-time Timer Alarm Register" (RTT_AR). If the counter value matches the alarm, the ALMS bit in the RTT_SR is set. The RTT_AR is set to its maximum value (0xFFFF_FFFF) after a reset. The ALMS flag is always a source of the RTT alarm signal that may be used to exit the system from low power modes (see Figure 15-1). The alarm interrupt must be disabled (ALMIEN must be cleared in RTT_MR) when writing a new ALMV value in the RTT_AR. The RTTINC bit can be used to start a periodic interrupt, the period being one second when the RTPRES field value = 0x8000 and the slow clock = 32.768 kHz. The RTTINCIEN bit must be cleared prior to writing a new RTPRES value in the RTT_MR. Reading the RTT_SR automatically clears the RTTINC and ALMS bits. Writing the RTTRST bit in the RTT_MR immediately reloads and restarts the clock divider with the new programmed value. This also resets the 32-bit counter. When not used, the Real-time Timer can be disabled in order to suppress dynamic power consumption in this module. This can be achieved by setting the RTTDIS bit in the RTT_MR. 286 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 15-2. RTT Counting SLCK RTPRES - 1 Prescaler 0 CRTV 0 ... ALMV-1 ALMV ALMV+1 ALMV+2 ALMV+3 RTTINC (RTT_SR) ALMS (RTT_SR) APB Interface APB cycle read RTT_SR APB cycle SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 287 15.5 Real-time Timer (RTT) User Interface Table 15-1. Register Mapping Offset Register Name Access Reset 0x00 Mode Register RTT_MR Read/Write 0x0000_8000 0x04 Alarm Register RTT_AR Read/Write 0xFFFF_FFFF 0x08 Value Register RTT_VR Read-only 0x0000_0000 0x0C Status Register RTT_SR Read-only 0x0000_0000 288 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 15.5.1 Real-time Timer Mode Register Name: RTT_MR Address: 0x400E1430 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 RTC1HZ 23 - 22 - 21 - 20 RTTDIS 19 - 18 RTTRST 17 RTTINCIEN 16 ALMIEN 15 14 13 12 11 10 9 8 3 2 1 0 RTPRES 7 6 5 4 RTPRES * RTPRES: Real-time Timer Prescaler Value Defines the number of SLCK periods required to increment the Real-time timer. RTPRES is defined as follows: RTPRES = 0: The prescaler period is equal to 216 * SLCK periods. RTPRES = 1 or 2: forbidden. RTPRES 0,1 or 2: The prescaler period is equal to RTPRES * SLCK periods. Note: The RTTINCIEN bit must be cleared prior to writing a new RTPRES value. * ALMIEN: Alarm Interrupt Enable 0: The bit ALMS in RTT_SR has no effect on interrupt. 1: The bit ALMS in RTT_SR asserts interrupt. * RTTINCIEN: Real-time Timer Increment Interrupt Enable 0: The bit RTTINC in RTT_SR has no effect on interrupt. 1: The bit RTTINC in RTT_SR asserts interrupt. * RTTRST: Real-time Timer Restart 0: No effect. 1: Reloads and restarts the clock divider with the new programmed value. This also resets the 32-bit counter. * RTTDIS: Real-time Timer Disable 0: The real-time timer is enabled. 1: The real-time timer is disabled (no dynamic power consumption). Note: RTTDIS is write only. * RTC1HZ: Real-Time Clock 1Hz Clock Selection 0: The RTT 32-bit counter is driven by the 16-bit prescaler roll-over events. 1: The RTT 32-bit counter is driven by the 1Hz RTC clock. Note: RTC1HZ is write only. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 289 15.5.2 Real-time Timer Alarm Register Name: RTT_AR Address: 0x400E1434 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ALMV 23 22 21 20 ALMV 15 14 13 12 ALMV 7 6 5 4 ALMV * ALMV: Alarm Value When the CRTV value in RTT_VR equals the ALMV field, the ALMS flag is set in RTT_SR. As soon as the ALMS flag rises, the CRTV value equals ALMV+1 (refer to Figure 15-2). Note: 290 The alarm interrupt must be disabled (ALMIEN must be cleared in RTT_MR) when writing a new ALMV value. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 15.5.3 Real-time Timer Value Register Name: RTT_VR Address: 0x400E1438 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 CRTV 23 22 21 20 CRTV 15 14 13 12 CRTV 7 6 5 4 CRTV * CRTV: Current Real-time Value Returns the current value of the Real-time Timer. Note: As CRTV can be updated asynchronously, it must be read twice at the same value. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 291 15.5.4 Real-time Timer Status Register Name: RTT_SR Address: 0x400E143C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 RTTINC 0 ALMS * ALMS: Real-time Alarm Status (cleared on read) 0: The Real-time Alarm has not occurred since the last read of RTT_SR. 1: The Real-time Alarm occurred since the last read of RTT_SR. * RTTINC: Prescaler Roll-over Status (cleared on read) 0: No prescaler roll-over occurred since the last read of the RTT_SR. 1: Prescaler roll-over occurred since the last read of the RTT_SR. 292 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16. Real-time Clock (RTC) 16.1 Description The Real-time Clock (RTC) peripheral is designed for very low power consumption. For optimal functionality, the RTC requires an accurate external 32.768 kHz clock, which can be provided by a crystal oscillator. It combines a complete time-of-day clock with alarm and a Gregorian or Persian calendar, complemented by a programmable periodic interrupt. The alarm and calendar registers are accessed by a 32-bit data bus. The time and calendar values are coded in binary-coded decimal (BCD) format. The time format can be 24-hour mode or 12-hour mode with an AM/PM indicator. Updating time and calendar fields and configuring the alarm fields are performed by a parallel capture on the 32-bit data bus. An entry control is performed to avoid loading registers with incompatible BCD format data or with an incompatible date according to the current month/year/century. A clock divider calibration circuitry can be used to compensate for crystal oscillator frequency inaccuracy. An RTC output can be programmed to generate several waveforms, including a prescaled clock derived from 32.768 kHz. 16.2 Embedded Characteristics Ultra Low Power Consumption Full Asynchronous Design Gregorian Calendar up to 2099 or Persian Calendar Programmable Periodic Interrupt Safety/security features: Valid Time and Date Programmation Check On-The-Fly Time and Date Validity Check Crystal Oscillator Clock Calibration Waveform Generation Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 293 16.3 Block Diagram Figure 16-1. RTC Block Diagram Slow Clock: SLCK 32768 Divider Time Wave Generator Date RTCOUT0 RTCOUT1 Clock Calibration System Bus 16.4 User Interface Entry Control Alarm Interrupt Control RTC Interrupt Product Dependencies 16.4.1 Power Management The Real-time Clock is continuously clocked at 32.768 kHz. The Power Management Controller has no effect on RTC behavior. 16.4.2 Interrupt RTC interrupt line is connected on one of the internal sources of the interrupt controller. RTC interrupt requires the interrupt controller to be programmed first. Table 16-1. 16.5 Peripheral IDs Instance ID RTC 2 Functional Description The RTC provides a full binary-coded decimal (BCD) clock that includes century (19/20), year (with leap years), month, date, day, hours, minutes and seconds reported in RTC Time Register (RTC_TIMR) and RTC Calendar Register (RTC_CALR). The valid year range is up to 2099 in Gregorian mode (or 1300 to 1499 in Persian mode). The RTC can operate in 24-hour mode or in 12-hour mode with an AM/PM indicator. Corrections for leap years are included (all years divisible by 4 being leap years except 1900). This is correct up to the year 2099. The RTC can generate configurable waveforms on RTCOUT0/1 outputs. 16.5.1 Reference Clock The reference clock is the Slow Clock (SLCK). It can be driven internally or by an external 32.768 kHz crystal. During low power modes of the processor, the oscillator runs and power consumption is critical. The crystal selection has to take into account the current consumption for power saving and the frequency drift due to temperature effect on the circuit for time accuracy. 294 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.5.2 Timing The RTC is updated in real time at one-second intervals in normal mode for the counters of seconds, at oneminute intervals for the counter of minutes and so on. Due to the asynchronous operation of the RTC with respect to the rest of the chip, to be certain that the value read in the RTC registers (century, year, month, date, day, hours, minutes, seconds) are valid and stable, it is necessary to read these registers twice. If the data is the same both times, then it is valid. Therefore, a minimum of two and a maximum of three accesses are required. 16.5.3 Alarm The RTC has five programmable fields: month, date, hours, minutes and seconds. Each of these fields can be enabled or disabled to match the alarm condition: If all the fields are enabled, an alarm flag is generated (the corresponding flag is asserted and an interrupt generated if enabled) at a given month, date, hour/minute/second. If only the "seconds" field is enabled, then an alarm is generated every minute. Depending on the combination of fields enabled, a large number of possibilities are available to the user ranging from minutes to 365/366 days. Hour, minute and second matching alarm (SECEN, MINEN, HOUREN) can be enabled independently of SEC, MIN, HOUR fields. Note: To change one of the SEC, MIN, HOUR, DATE, MONTH fields, it is recommended to disable the field before changing the value and then re-enable it after the change has been made. This requires up to three accesses to the RTC_TIMALR or RTC_CALALR. The first access clears the enable corresponding to the field to change (SECEN, MINEN, HOUREN, DATEEN, MTHEN). If the field is already cleared, this access is not required. The second access performs the change of the value (SEC, MIN, HOUR, DATE, MONTH). The third access is required to re-enable the field by writing 1 in SECEN, MINEN, HOUREn, DATEEN, MTHEN fields. 16.5.4 Error Checking when Programming Verification on user interface data is performed when accessing the century, year, month, date, day, hours, minutes, seconds and alarms. A check is performed on illegal BCD entries such as illegal date of the month with regard to the year and century configured. If one of the time fields is not correct, the data is not loaded into the register/counter and a flag is set in the validity register. The user can not reset this flag. It is reset as soon as an acceptable value is programmed. This avoids any further side effects in the hardware. The same procedure is followed for the alarm. The following checks are performed: 1. Century (check if it is in range 19-20 or 13-14 in Persian mode) 2. Year (BCD entry check) 3. Date (check range 01-31) 4. Month (check if it is in BCD range 01-12, check validity regarding "date") 5. Day (check range 1-7) 6. Hour (BCD checks: in 24-hour mode, check range 00-23 and check that AM/PM flag is not set if RTC is set in 24-hour mode; in 12-hour mode check range 01-12) 7. Minute (check BCD and range 00-59) 8. Second (check BCD and range 00-59) Note: If the 12-hour mode is selected by means of the RTC Mode Register (RTC_MR), a 12-hour value can be programmed and the returned value on RTC_TIMR will be the corresponding 24-hour value. The entry control checks the value of the AM/PM indicator (bit 22 of RTC_TIMR) to determine the range to be checked. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 295 16.5.5 RTC Internal Free Running Counter Error Checking To improve the reliability and security of the RTC, a permanent check is performed on the internal free running counters to report non-BCD or invalid date/time values. An error is reported by TDERR bit in the status register (RTC_SR) if an incorrect value has been detected. The flag can be cleared by setting the TDERRCLR bit in the Status Clear Command Register (RTC_SCCR). Anyway the TDERR error flag will be set again if the source of the error has not been cleared before clearing the TDERR flag. The clearing of the source of such error can be done either by reprogramming a correct value on RTC_CALR and/or RTC_TIMR. The RTC internal free running counters may automatically clear the source of TDERR due to their roll-over (i.e., every 10 seconds for SECONDS[3:0] field in RTC_TIMR). In this case the TDERR is held high until a clear command is asserted by TDERRCLR bit in RTC_SCCR. 16.5.6 Updating Time/Calendar To update any of the time/calendar fields, the user must first stop the RTC by setting the corresponding field in the Control Register (RTC_CR). Bit UPDTIM must be set to update time fields (hour, minute, second) and bit UPDCAL must be set to update calendar fields (century, year, month, date, day). The ACKUPD bit is automatically set within a second after setting the UPDTIM and/or UPDCAL bit (meaning one second is the maximum duration of the polling or wait for interrupt period). Once ACKUPD is set, it is mandatory to clear this flag by writing the corresponding bit in the RTC_SCCR, after which the user can write to the Time Register, the Calendar Register, or both. Once the update is finished, the user must clear UPDTIM and/or UPDCAL in the RTC_CR. When entering programming mode of the calendar fields, the time fields remain enabled. When entering the programming mode of the time fields, both time and calendar fields are stopped. This is due to the location of the calendar logic circuity (downstream for low-power considerations). It is highly recommended to prepare all the fields to be updated before entering programming mode. In successive update operations, the user must wait at least one second after resetting the UPDTIM/UPDCAL bit in the RTC_CR before setting these bits again. This is done by waiting for the SEC flag in the RTC_SR before setting UPDTIM/UPDCAL bit. After clearing UPDTIM/UPDCAL, the SEC flag must also be cleared. 296 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 16-2. Update Sequence Begin Prepare Time or Calendar Fields Set UPDTIM and/or UPDCAL bit(s) in RTC_CR Read RTC_SR Polling or IRQ (if enabled) ACKUPD =1? No Yes Clear ACKUPD bit in RTC_SCCR Update Time and/or Calendar values in RTC_TIMR/RTC_CALR Clear UPDTIM and/or UPDCAL bit in RTC_CR End SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 297 16.5.7 RTC Accurate Clock Calibration The crystal oscillator that drives the RTC may not be as accurate as expected mainly due to temperature variation. The RTC is equipped with circuitry able to correct slow clock crystal drift. To compensate for possible temperature variations over time, this accurate clock calibration circuitry can be programmed on-the-fly and also programmed during application manufacturing, in order to correct the crystal frequency accuracy at room temperature (20-25C). The typical clock drift range at room temperature is 20 ppm. In the device operating temperature range, the 32.768 kHz crystal oscillator clock inaccuracy can be up to -200 ppm. The RTC clock calibration circuitry allows positive or negative correction in a range of 1.5 ppm to 1950 ppm. The calibration circuitry is fully digital. Thus, the configured correction is independent of temperature, voltage, process, etc., and no additional measurement is required to check that the correction is effective. If the correction value configured in the calibration circuitry results from an accurate crystal frequency measure, the remaining accuracy is bounded by the values listed below: Below 1 ppm, for an initial crystal drift between 1.5 ppm up to 20 ppm, and from 30 ppm to 90 ppm Below 2 ppm, for an initial crystal drift between 20 ppm up to 30 ppm, and from 90 ppm to 130 ppm Below 5 ppm, for an initial crystal drift between 130 ppm up to 200 ppm The calibration circuitry does not modify the 32.768 kHz crystal oscillator clock frequency but it acts by slightly modifying the 1 Hz clock period from time to time. When the period is modified, depending on the sign of the correction, the 1 Hz clock period increases or reduces by around 4 ms. Depending on the CORRECTION, NEGPPM and HIGHPPM values configured in RTC_MR, the period interval between two correction events differs. Figure 16-3. Calibration circuitry RTC Divider by 32768 32.768 kHz Oscillator Add 32.768 kHz Integrator Comparator Other Logic 298 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1Hz Time/Calendar Suppress CORRECTION, HIGHPPM NEGPPM Figure 16-4. Calibration circuitry waveforms Monotonic 1Hz Counter value Nominal 32.768 kHz 32.768 kHz +50ppm Phase adjustment (~4ms) 32.768 kHz -50ppm -25ppm Crystal frequency remains unadjusted -50ppm Internal 1Hz clock is adjusted Time -50ppm correction period -25ppm correction period User configurable period (integer multiple of 1s or 20s) Time NEGATIVE CORRECTION Crystal clock Internally divided clock (256Hz) Clock pulse periodically suppressed when correction period elapses Internally divided clock (128Hz) 1.000 second 128 Hz clock edge delayed by 3,906 ms when correction period elapses POSITIVE CORRECTION 1.003906 second Internally divided clock (256Hz) Internally divided clock (128Hz) Clock edge periodically added when correction period elapses Internally divided clock (64Hz) 128 Hz clock edge delayed by 3,906 ms when correction period elapses 0.996094 second 1.000 second The inaccuracy of a crystal oscillator at typical room temperature (20 ppm at 20-25 C) can be compensated if a reference clock/signal is used to measure such inaccuracy. This kind of calibration operation can be set up during SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 299 the final product manufacturing by means of measurement equipment embedding such a reference clock. The correction of value must be programmed into the (RTC_MR), and this value is kept as long as the circuitry is powered (backup area). Removing the backup power supply cancels this calibration. This room temperature calibration can be further processed by means of the networking capability of the target application. To ease the comparison of the inherent crystal accuracy with the reference clock/signal during manufacturing, an internal prescaled 32.768 kHz clock derivative signal can be assigned to drive RTC output. To accommodate the measure, several clock frequencies can be selected among 1 Hz, 32 Hz, 64 Hz, 512 Hz. The clock calibration correction drives the internal RTC counters but can also be observed in the RTC output when one of the following three frequencies 1 Hz, 32 Hz or 64 Hz is configured. The correction is not visible in the RTC output if 512 Hz frequency is configured. In any event, this adjustment does not take into account the temperature variation. The frequency drift (up to -200 ppm) due to temperature variation can be compensated using a reference time if the application can access such a reference. If a reference time cannot be used, a temperature sensor can be placed close to the crystal oscillator in order to get the operating temperature of the crystal oscillator. Once obtained, the temperature may be converted using a lookup table (describing the accuracy/temperature curve of the crystal oscillator used) and RTC_MR configured accordingly. The calibration can be performed on-the-fly. This adjustment method is not based on a measurement of the crystal frequency/drift and therefore can be improved by means of the networking capability of the target application. If no crystal frequency adjustment has been done during manufacturing, it is still possible to do it. In the case where a reference time of the day can be obtained through LAN/WAN network, it is possible to calculate the drift of the application crystal oscillator by comparing the values read on RTC Time Register (RTC_TIMR) and programming the HIGHPPM and CORRECTION fields on RTC_MR according to the difference measured between the reference time and those of RTC_TIMR. 16.5.8 Waveform Generation Waveforms can be generated by the RTC in order to take advantage of the RTC inherent prescalers while the RTC is the only powered circuitry (low power mode of operation, backup mode) or in any active modes. Going into backup or low power operating modes does not affect the waveform generation outputs. The RTC outputs (RTCOUT0 and RTCOUT1) have a source driver selected among seven possibilities. The first selection choice sticks the associated output at 0 (This is the reset value and it can be used at any time to disable the waveform generation). Selection choices 1 to 4 respectively select 1 Hz, 32 Hz, 64 Hz and 512 Hz. 32 Hz or 64 Hz can drive, for example, a TN LCD backplane signal while 1 Hz can be used to drive a blinking character like ":" for basic time display (hour, minute) on TN LCDs. Selection choice 5 provides a toggling signal when the RTC alarm is reached. Selection choice 6 provides a copy of the alarm flag, so the associated output is set high (logical 1) when an alarm occurs and immediately cleared when software clears the alarm interrupt source. Selection choice 7 provides a 1 Hz periodic high pulse of 15 s duration that can be used to drive external devices for power consumption reduction or any other purpose. PIO lines associated to RTC outputs are automatically selecting these waveforms as soon as RTC_MR corresponding fields OUT0 and OUT1 differ from 0. 300 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 16-5. Waveform Generation `0' 0 `0' 0 1 Hz 1 1 Hz 1 32 Hz 2 32 Hz 2 64 Hz 3 64 Hz 3 512 Hz 4 512 Hz 4 toggle_alarm 5 toggle_alarm 5 flag_alarm 6 flag_alarm 6 pulse 7 pulse 7 RTCOUT0 RTC_MR(OUT0) RTCOUT1 RTC_MR(OUT1) alarm match event 2 alarm match event 1 flag_alarm RTC_SCCR(ALRCLR) RTC_SCCR(ALRCLR) toggle_alarm pulse Thigh Tperiod Tperiod SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 301 16.6 Real-time Clock (RTC) User Interface Table 16-2. Offset Register Mapping Register Name Access Reset 0x00 Control Register RTC_CR Read/Write 0x0 0x04 Mode Register RTC_MR Read/Write 0x0 0x08 Time Register RTC_TIMR Read/Write 0x0 0x0C Calendar Register RTC_CALR Read/Write 0x01A11020 0x10 Time Alarm Register RTC_TIMALR Read/Write 0x0 0x14 Calendar Alarm Register RTC_CALALR Read/Write 0x01010000 0x18 Status Register RTC_SR Read-only 0x0 0x1C Status Clear Command Register RTC_SCCR Write-only - 0x20 Interrupt Enable Register RTC_IER Write-only - 0x24 Interrupt Disable Register RTC_IDR Write-only - 0x28 Interrupt Mask Register RTC_IMR Read-only 0x0 0x2C Valid Entry Register RTC_VER Read-only 0x0 0x30-0xC8 Reserved - - - 0xD0 Reserved - - - 0xD4-0xF8 Reserved - - - 0xFC Reserved - - - Note: If an offset is not listed in the table it must be considered as reserved. 302 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.6.1 RTC Control Register Name: RTC_CR Address: 0x400E1460 Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 - - - - - - 15 14 13 12 11 10 - - - - - - 16 CALEVSEL 9 8 TIMEVSEL 7 6 5 4 3 2 1 0 - - - - - - UPDCAL UPDTIM This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_WPMR). * UPDTIM: Update Request Time Register 0: No effect. 1: Stops the RTC time counting. Time counting consists of second, minute and hour counters. Time counters can be programmed once this bit is set and acknowledged by the bit ACKUPD of the RTC_SR. * UPDCAL: Update Request Calendar Register 0: No effect. 1: Stops the RTC calendar counting. Calendar counting consists of day, date, month, year and century counters. Calendar counters can be programmed once this bit is set and acknowledged by the bit ACKUPD of the RTC_SR. * TIMEVSEL: Time Event Selection The event that generates the flag TIMEV in RTC_SR depends on the value of TIMEVSEL. Value Name Description 0 MINUTE Minute change 1 HOUR Hour change 2 MIDNIGHT Every day at midnight 3 NOON Every day at noon SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 303 * CALEVSEL: Calendar Event Selection The event that generates the flag CALEV in RTC_SR depends on the value of CALEVSEL Value Name Description 0 WEEK Week change (every Monday at time 00:00:00) 1 MONTH Month change (every 01 of each month at time 00:00:00) 2 YEAR Year change (every January 1 at time 00:00:00) 304 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.6.2 RTC Mode Register Name: RTC_MR Address: 0x400E1464 Access: Read/Write 31 30 - - 23 22 - 15 29 28 27 TPERIOD 21 20 19 OUT1 14 13 26 25 - 18 17 - 12 HIGHPPM 11 24 THIGH 16 OUT0 10 9 8 CORRECTION 7 6 5 4 3 2 1 0 - - - NEGPPM - - PERSIAN HRMOD This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_WPMR). * HRMOD: 12-/24-hour Mode 0: 24-hour mode is selected. 1: 12-hour mode is selected. * PERSIAN: PERSIAN Calendar 0: Gregorian calendar. 1: Persian calendar. * NEGPPM: NEGative PPM Correction 0: Positive correction (the divider will be slightly higher than 32768). 1: Negative correction (the divider will be slightly lower than 32768). Refer to CORRECTION and HIGHPPM field descriptions. Note: NEGPPM must be cleared to correct a crystal slower than 32.768 kHz. * CORRECTION: Slow Clock Correction 0: No correction 1-127: The slow clock will be corrected according to the formula given in HIGHPPM description. * HIGHPPM: HIGH PPM Correction 0: Lower range ppm correction with accurate correction. 1: Higher range ppm correction with accurate correction. If the absolute value of the correction to be applied is lower than 30 ppm, it is recommended to clear HIGHPPM. HIGHPPM set to 1 is recommended for 30 ppm correction and above. Formula: If HIGHPPM = 0, then the clock frequency correction range is from 1.5 ppm up to 98 ppm. The RTC accuracy is less than 1 ppm for a range correction from 1.5 ppm up to 30 ppm. The correction field must be programmed according to the required correction in ppm; the formula is as follows: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 305 3906 CORRECTION = ----------------------- - 1 20 x ppm The value obtained must be rounded to the nearest integer prior to being programmed into CORRECTION field. If HIGHPPM = 1, then the clock frequency correction range is from 30.5 ppm up to 1950 ppm. The RTC accuracy is less than 1 ppm for a range correction from 30.5 ppm up to 90 ppm. The correction field must be programmed according to the required correction in ppm; the formula is as follows: 3906 CORRECTION = ------------ - 1 ppm The value obtained must be rounded to the nearest integer prior to be programmed into CORRECTION field. If NEGPPM is set to 1, the ppm correction is negative (used to correct crystals that are faster than the nominal 32.768 kHz). * OUT0: RTCOUT0 OutputSource Selection Value Name Description 0 NO_WAVE No waveform, stuck at `0' 1 FREQ1HZ 1 Hz square wave 2 FREQ32HZ 32 Hz square wave 3 FREQ64HZ 64 Hz square wave 4 FREQ512HZ 512 Hz square wave 5 ALARM_TOGGLE Output toggles when alarm flag rises 6 ALARM_FLAG Output is a copy of the alarm flag 7 PROG_PULSE Duty cycle programmable pulse * OUT1: RTCOUT1 Output Source Selection Value Name Description 0 NO_WAVE No waveform, stuck at `0' 1 FREQ1HZ 1 Hz square wave 2 FREQ32HZ 32 Hz square wave 3 FREQ64HZ 64 Hz square wave 4 FREQ512HZ 512 Hz square wave 5 ALARM_TOGGLE Output toggles when alarm flag rises 6 ALARM_FLAG Output is a copy of the alarm flag 7 PROG_PULSE Duty cycle programmable pulse * THIGH: High Duration of the Output Pulse Value 306 Name Description 0 H_31MS 31.2 ms 1 H_16MS 15.6 ms 2 H_4MS 3.91 ms SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Value Name Description 3 H_976US 976 s 4 H_488US 488 s 5 H_122US 122 s 6 H_30US 30.5 s 7 H_15US 15.2 s * TPERIOD: Period of the Output Pulse Value Name Description 0 P_1S 1 second 1 P_500MS 500 ms 2 P_250MS 250 ms 3 P_125MS 125 ms SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 307 16.6.3 RTC Time Register Name: RTC_TIMR Address: 0x400E1468 Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - AMPM 15 14 10 9 8 2 1 0 HOUR 13 12 - 7 11 MIN 6 5 - 4 3 SEC * SEC: Current Second The range that can be set is 0-59 (BCD). The lowest four bits encode the units. The higher bits encode the tens. * MIN: Current Minute The range that can be set is 0-59 (BCD). The lowest four bits encode the units. The higher bits encode the tens. * HOUR: Current Hour The range that can be set is 1-12 (BCD) in 12-hour mode or 0-23 (BCD) in 24-hour mode. * AMPM: Ante Meridiem Post Meridiem Indicator This bit is the AM/PM indicator in 12-hour mode. 0: AM. 1: PM. All non-significant bits read zero. 308 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.6.4 RTC Calendar Register Name: RTC_CALR Address: 0x400E146C Access: Read/Write 31 30 - - 23 22 29 28 27 21 20 19 DAY 15 14 26 25 24 18 17 16 DATE MONTH 13 12 11 10 9 8 3 2 1 0 YEAR 7 6 5 - 4 CENT * CENT: Current Century The range that can be set is 19-20 (gregorian) or 13-14 (persian) (BCD). The lowest four bits encode the units. The higher bits encode the tens. * YEAR: Current Year The range that can be set is 00-99 (BCD). The lowest four bits encode the units. The higher bits encode the tens. * MONTH: Current Month The range that can be set is 01-12 (BCD). The lowest four bits encode the units. The higher bits encode the tens. * DAY: Current Day in Current Week The range that can be set is 1-7 (BCD). The coding of the number (which number represents which day) is user-defined as it has no effect on the date counter. * DATE: Current Day in Current Month The range that can be set is 01-31 (BCD). The lowest four bits encode the units. The higher bits encode the tens. All non-significant bits read zero. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 309 16.6.5 RTC Time Alarm Register Name: RTC_TIMALR Address: 0x400E1470 Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 21 20 19 18 17 16 10 9 8 2 1 0 23 22 HOUREN AMPM 15 14 HOUR 13 12 MINEN 7 11 MIN 6 5 SECEN 4 3 SEC This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_WPMR). Note: To change one of the SEC, MIN, HOUR fields, it is recommended to disable the field before changing the value and then reenable it after the change has been made. This requires up to three accesses to the RTC_TIMALR. The first access clears the enable corresponding to the field to change (SECEN, MINEN, HOUREN). If the field is already cleared, this access is not required. The second access performs the change of the value (SEC, MIN, HOUR). The third access is required to re-enable the field by writing 1 in SECEN, MINEN, HOUREN fields. * SEC: Second Alarm This field is the alarm field corresponding to the BCD-coded second counter. * SECEN: Second Alarm Enable 0: The second-matching alarm is disabled. 1: The second-matching alarm is enabled. * MIN: Minute Alarm This field is the alarm field corresponding to the BCD-coded minute counter. * MINEN: Minute Alarm Enable 0: The minute-matching alarm is disabled. 1: The minute-matching alarm is enabled. * HOUR: Hour Alarm This field is the alarm field corresponding to the BCD-coded hour counter. * AMPM: AM/PM Indicator This field is the alarm field corresponding to the BCD-coded hour counter. * HOUREN: Hour Alarm Enable 0: The hour-matching alarm is disabled. 1: The hour-matching alarm is enabled. 310 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.6.6 RTC Calendar Alarm Register Name: RTC_CALALR Address: 0x400E1474 Access: Read/Write 31 30 DATEEN - 29 28 27 26 25 24 18 17 16 DATE 23 22 21 MTHEN - - 20 19 15 14 13 12 11 10 9 8 - - - - - - - - MONTH 7 6 5 4 3 2 1 0 - - - - - - - - This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_WPMR). Note: To change one of the DATE, MONTH fields, it is recommended to disable the field before changing the value and then re-enable it after the change has been made. This requires up to three accesses to the RTC_CALALR. The first access clears the enable corresponding to the field to change (DATEEN, MTHEN). If the field is already cleared, this access is not required. The second access performs the change of the value (DATE, MONTH). The third access is required to re-enable the field by writing 1 in DATEEN, MTHEN fields. * MONTH: Month Alarm This field is the alarm field corresponding to the BCD-coded month counter. * MTHEN: Month Alarm Enable 0: The month-matching alarm is disabled. 1: The month-matching alarm is enabled. * DATE: Date Alarm This field is the alarm field corresponding to the BCD-coded date counter. * DATEEN: Date Alarm Enable 0: The date-matching alarm is disabled. 1: The date-matching alarm is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 311 16.6.7 RTC Status Register Name: RTC_SR Address: 0x400E1478 Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - TDERR CALEV TIMEV SEC ALARM ACKUPD * ACKUPD: Acknowledge for Update Value Name Description 0 FREERUN Time and calendar registers cannot be updated. 1 UPDATE Time and calendar registers can be updated. * ALARM: Alarm Flag Value Name Description 0 NO_ALARMEVENT No alarm matching condition occurred. 1 ALARMEVENT An alarm matching condition has occurred. * SEC: Second Event Value Name Description 0 NO_SECEVENT No second event has occurred since the last clear. 1 SECEVENT At least one second event has occurred since the last clear. * TIMEV: Time Event Value Name Description 0 NO_TIMEVENT No time event has occurred since the last clear. 1 TIMEVENT At least one time event has occurred since the last clear. Note: The time event is selected in the TIMEVSEL field in the Control Register (RTC_CR) and can be any one of the following events: minute change, hour change, noon, midnight (day change). * CALEV: Calendar Event Value Name Description 0 NO_CALEVENT No calendar event has occurred since the last clear. 1 CALEVENT At least one calendar event has occurred since the last clear. Note: The calendar event is selected in the CALEVSEL field in the Control Register (RTC_CR) and can be any one of the following events: week change, month change and year change. 312 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * TDERR: Time and/or Date Free Running Error Value Name Description 0 CORRECT The internal free running counters are carrying valid values since the last read of the Status Register (RTC_SR). 1 ERR_TIMEDATE The internal free running counters have been corrupted (invalid date or time, non-BCD values) since the last read and/or they are still invalid. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 313 16.6.8 RTC Status Clear Command Register Name: RTC_SCCR Address: 0x400E147C Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - TDERRCLR CALCLR TIMCLR SECCLR ALRCLR ACKCLR * ACKCLR: Acknowledge Clear 0: No effect. 1: Clears corresponding status flag in the Status Register (RTC_SR). * ALRCLR: Alarm Clear 0: No effect. 1: Clears corresponding status flag in the Status Register (RTC_SR). * SECCLR: Second Clear 0: No effect. 1: Clears corresponding status flag in the Status Register (RTC_SR). * TIMCLR: Time Clear 0: No effect. 1: Clears corresponding status flag in the Status Register (RTC_SR). * CALCLR: Calendar Clear 0: No effect. 1: Clears corresponding status flag in the Status Register (RTC_SR). * TDERRCLR: Time and/or Date Free Running Error Clear 0: No effect. 1: Clears corresponding status flag in the Status Register (RTC_SR). 314 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.6.9 RTC Interrupt Enable Register Name: RTC_IER Address: 0x400E1480 Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - TDERREN CALEN TIMEN SECEN ALREN ACKEN * ACKEN: Acknowledge Update Interrupt Enable 0: No effect. 1: The acknowledge for update interrupt is enabled. * ALREN: Alarm Interrupt Enable 0: No effect. 1: The alarm interrupt is enabled. * SECEN: Second Event Interrupt Enable 0: No effect. 1: The second periodic interrupt is enabled. * TIMEN: Time Event Interrupt Enable 0: No effect. 1: The selected time event interrupt is enabled. * CALEN: Calendar Event Interrupt Enable 0: No effect. 1: The selected calendar event interrupt is enabled. * TDERREN: Time and/or Date Error Interrupt Enable 0: No effect. 1: The time and date error interrupt is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 315 16.6.10 RTC Interrupt Disable Register Name: RTC_IDR Address: 0x400E1484 Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - TDERRDIS CALDIS TIMDIS SECDIS ALRDIS ACKDIS * ACKDIS: Acknowledge Update Interrupt Disable 0: No effect. 1: The acknowledge for update interrupt is disabled. * ALRDIS: Alarm Interrupt Disable 0: No effect. 1: The alarm interrupt is disabled. * SECDIS: Second Event Interrupt Disable 0: No effect. 1: The second periodic interrupt is disabled. * TIMDIS: Time Event Interrupt Disable 0: No effect. 1: The selected time event interrupt is disabled. * CALDIS: Calendar Event Interrupt Disable 0: No effect. 1: The selected calendar event interrupt is disabled. * TDERRDIS: Time and/or Date Error Interrupt Disable 0: No effect. 1: The time and date error interrupt is disabled. 316 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.6.11 RTC Interrupt Mask Register Name: RTC_IMR Address: 0x400E1488 Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - TDERR CAL TIM SEC ALR ACK * ACK: Acknowledge Update Interrupt Mask 0: The acknowledge for update interrupt is disabled. 1: The acknowledge for update interrupt is enabled. * ALR: Alarm Interrupt Mask 0: The alarm interrupt is disabled. 1: The alarm interrupt is enabled. * SEC: Second Event Interrupt Mask 0: The second periodic interrupt is disabled. 1: The second periodic interrupt is enabled. * TIM: Time Event Interrupt Mask 0: The selected time event interrupt is disabled. 1: The selected time event interrupt is enabled. * CAL: Calendar Event Interrupt Mask 0: The selected calendar event interrupt is disabled. 1: The selected calendar event interrupt is enabled. * TDERR: Time and/or Date Error Mask 0: The time and/or date error event is disabled. 1: The time and/or date error event is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 317 16.6.12 RTC Valid Entry Register Name: RTC_VER Address: 0x400E148C Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - NVCALALR NVTIMALR NVCAL NVTIM * NVTIM: Non-valid Time 0: No invalid data has been detected in RTC_TIMR (Time Register). 1: RTC_TIMR has contained invalid data since it was last programmed. * NVCAL: Non-valid Calendar 0: No invalid data has been detected in RTC_CALR (Calendar Register). 1: RTC_CALR has contained invalid data since it was last programmed. * NVTIMALR: Non-valid Time Alarm 0: No invalid data has been detected in RTC_TIMALR (Time Alarm Register). 1: RTC_TIMALR has contained invalid data since it was last programmed. * NVCALALR: Non-valid Calendar Alarm 0: No invalid data has been detected in RTC_CALALR (Calendar Alarm Register). 1: RTC_CALALR has contained invalid data since it was last programmed. 318 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 17. Watchdog Timer (WDT) 17.1 Description The Watchdog Timer (WDT) is used to prevent system lock-up if the software becomes trapped in a deadlock. It features a 12-bit down counter that allows a watchdog period of up to 16 seconds (slow clock around 32 kHz). It can generate a general reset or a processor reset only. In addition, it can be stopped while the processor is in debug mode or idle mode. 17.2 Embedded Characteristics 12-bit Key-protected Programmable Counter Watchdog Clock is Independent from Processor Clock Provides Reset or Interrupt Signals to the System Counter May Be Stopped while the Processor is in Debug State or in Idle Mode SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 319 17.3 Block Diagram Figure 17-1. Watchdog Timer Block Diagram write WDT_MR WDT_MR WDV WDT_CR WDRSTT reload 1 0 12-bit Down Counter WDT_MR WDD reload Current Value 1/128 SLCK <= WDD WDT_MR WDRSTEN =0 wdt_fault (to Reset Controller) set set read WDT_SR or reset 320 WDERR reset SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 WDUNF reset wdt_int WDFIEN WDT_MR 17.4 Functional Description The Watchdog Timer is used to prevent system lock-up if the software becomes trapped in a deadlock. It is supplied with VDDCORE. It restarts with initial values on processor reset. The watchdog is built around a 12-bit down counter, which is loaded with the value defined in the field WDV of the Mode Register (WDT_MR). The Watchdog Timer uses the slow clock divided by 128 to establish the maximum watchdog period to be 16 seconds (with a typical slow clock of 32.768 kHz). After a processor reset, the value of WDV is 0xFFF, corresponding to the maximum value of the counter with the external reset generation enabled (field WDRSTEN at 1 after a backup reset). This means that a default watchdog is running at reset, i.e., at power-up. The user can either disable the WDT by setting bit WDT_MR.WDDIS or reprogram the WDT to meet the maximum watchdog period the application requires. If the watchdog is restarted by writing into the Control Register (WDT_CR), WDT_MR must not be programmed during a period of time of three slow clock periods following the WDT_CR write access. In any case, programming a new value in WDT_MR automatically initiates a restart instruction. WDT_MR can be written only once. Only a processor reset resets it. Writing WDT_MR reloads the timer with the newly programmed mode parameters. In normal operation, the user reloads the watchdog at regular intervals before the timer underflow occurs, by setting bit WDT_CR.WDRSTT. The watchdog counter is then immediately reloaded from WDT_MR and restarted, and the slow clock 128 divider is reset and restarted. WDT_CR is write-protected. As a result, writing WDT_CR without the correct hard-coded key has no effect. If an underflow does occur, the "wdt_fault" signal to the Reset Controller is asserted if bit WDT_MR.WDRSTEN is set. Moreover, the bit WDUNF is set in the Status Register (WDT_SR). To prevent a software deadlock that continuously triggers the watchdog, the reload of the watchdog must occur while the watchdog counter is within a window between 0 and WDD, WDD is defined in WDT_MR. Any attempt to restart the watchdog while the watchdog counter is between WDV and WDD results in a watchdog error, even if the watchdog is disabled. The bit WDT_SR.WDERR is updated and the "wdt_fault" signal to the Reset Controller is asserted. Note that this feature can be disabled by programming a WDD value greater than or equal to the WDV value. In such a configuration, restarting the Watchdog Timer is permitted in the whole range [0; WDV] and does not generate an error. This is the default configuration on reset (the WDD and WDV values are equal). The status bits WDUNF (Watchdog Underflow) and WDERR (Watchdog Error) trigger an interrupt, provided the bit WDT_MR.WDFIEN is set. The signal "wdt_fault" to the Reset Controller causes a watchdog reset if the WDRSTEN bit is set as already explained in the Reset Controller documentation. In this case, the processor and the Watchdog Timer are reset, and the WDERR and WDUNF flags are reset. If a reset is generated or if WDT_SR is read, the status bits are reset, the interrupt is cleared, and the "wdt_fault" signal to the reset controller is deasserted. Writing WDT_MR reloads and restarts the down counter. While the processor is in debug state or in idle mode, the counter may be stopped depending on the value programmed for the bits WDIDLEHLT and WDDBGHLT in WDT_MR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 321 Figure 17-2. Watchdog Behavior Watchdog Error Watchdog Underflow if WDRSTEN is 1 FFF if WDRSTEN is 0 Normal behavior WDV Forbidden Window WDD Permitted Window 0 WDT_CR.WDRSTT=1 Watchdog Fault 322 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 17.5 Watchdog Timer (WDT) User Interface Table 17-1. Register Mapping Offset Register Name Access Reset 0x00 Control Register WDT_CR Write-only - 0x04 Mode Register WDT_MR Read/Write Once 0x3FFF_2FFF 0x08 Status Register WDT_SR Read-only 0x0000_0000 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 323 17.5.1 Watchdog Timer Control Register Name: WDT_CR Address: 0x400E1450 Access: Write-only 31 30 29 28 27 26 25 24 KEY 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 WDRSTT * WDRSTT: Watchdog Restart 0: No effect. 1: Restarts the watchdog if KEY is written to 0xA5. * KEY: Password Value Name Description 0xA5 PASSWD Writing any other value in this field aborts the write operation. 324 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 17.5.2 Watchdog Timer Mode Register Name: WDT_MR Address: 0x400E1454 Access: Read/Write Once 31 - 30 - 29 WDIDLEHLT 28 WDDBGHLT 27 23 22 21 20 19 11 26 25 24 18 17 16 10 9 8 1 0 WDD WDD 15 WDDIS 14 13 12 WDRPROC WDRSTEN WDFIEN 7 6 5 4 WDV 3 2 WDV Note: The first write access prevents any further modification of the value of this register. Read accesses remain possible. Note: The WDD and WDV values must not be modified within three slow clock periods following a restart of the watchdog performed by a write access in WDT_CR. Any modification will cause the watchdog to trigger an end of period earlier than expected. * WDV: Watchdog Counter Value Defines the value loaded in the 12-bit watchdog counter. * WDFIEN: Watchdog Fault Interrupt Enable 0: A watchdog fault (underflow or error) has no effect on interrupt. 1: A watchdog fault (underflow or error) asserts interrupt. * WDRSTEN: Watchdog Reset Enable 0: A watchdog fault (underflow or error) has no effect on the resets. 1: A watchdog fault (underflow or error) triggers a watchdog reset. * WDRPROC: Watchdog Reset Processor 0: If WDRSTEN is 1, a watchdog fault (underflow or error) activates all resets. 1: If WDRSTEN is 1, a watchdog fault (underflow or error) activates the processor reset. * WDDIS: Watchdog Disable 0: Enables the Watchdog Timer. 1: Disables the Watchdog Timer. * WDD: Watchdog Delta Value Defines the permitted range for reloading the Watchdog Timer. If the Watchdog Timer value is less than or equal to WDD, setting bit WDT_CR.WDRSTT restarts the timer. If the Watchdog Timer value is greater than WDD, setting bit WDT_CR.WDRSTT causes a watchdog error. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 325 * WDDBGHLT: Watchdog Debug Halt 0: The watchdog runs when the processor is in debug state. 1: The watchdog stops when the processor is in debug state. * WDIDLEHLT: Watchdog Idle Halt 0: The watchdog runs when the system is in idle mode. 1: The watchdog stops when the system is in idle state. 326 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 17.5.3 Watchdog Timer Status Register Name: WDT_SR Address: 0x400E1458 Access Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 WDERR 0 WDUNF * WDUNF: Watchdog Underflow (cleared on read) 0: No watchdog underflow occurred since the last read of WDT_SR. 1: At least one watchdog underflow occurred since the last read of WDT_SR. * WDERR: Watchdog Error (cleared on read) 0: No watchdog error occurred since the last read of WDT_SR. 1: At least one watchdog error occurred since the last read of WDT_SR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 327 18. Supply Controller (SUPC) 18.1 Description The Supply Controller (SUPC) controls the supply voltages of the system and manages the Backup mode. In this mode, current consumption is reduced to a few microamps for backup power retention. Exit from this mode is possible on multiple wake-up sources. The SUPC also generates the slow clock by selecting either the low-power RC oscillator or the low-power crystal oscillator. 18.2 328 Embedded Characteristics Manages the Core Power Supply VDDCORE and Backup Mode by Controlling the Embedded Voltage Regulator A Supply Monitor Detection on VDDIO or a Brownout Detection on VDDCORE Triggers a Core Reset Generates the Slow Clock SLCK by Selecting Either the 22-42 kHz Low-Power RC Oscillator or the 32 kHz Low-Power Crystal Oscillator Low-power Tamper Detection on Two Inputs Anti-tampering by Immediate Clear of the General-purpose Backup Registers Supports Multiple Wake-up Sources for Exit from Backup Mode 16 Wake-up Inputs with Programmable Debouncing Real-Time Clock Alarm Real-Time Timer Alarm Supply Monitor Detection on VDDIO, with Programmable Scan Period and Voltage Threshold SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 18.3 Block Diagram Figure 18-1. Supply Controller Block Diagram Supply Controller Power-On Reset VDDCORE BODDIS supc_irq Interrupt Controller BODRSTEN Brown-Out Detector VDDCORE SMSMPL por_core_out bod_out SMRSTEN Supply Monitor Controller SMTH Programmable Supply Monitor VDDIO vddcore_nreset SMIEN Reset Controller sm_out NRST Zero-Power Power-On Reset VDDIO proc_nreset periph_nreset ice_nreset por_io_out Backup Area SLCK XTALSEL OSCBYPASS SLCK Slow Clock Controller XIN32 XTAL OSC 32kHz XOUT32 Real-Time Timer RC OSC 32kHz rtt_alarm sm_out SMEN RTTEN Real-Time Clock WKUP0-WKUP15 LPDBC LPDBCEN0 Wake-Up Controller LPDBCEN1 rtc_alarm RTCEN RTCOUT0 RTCOUT1 LPDBCCLR WKUPEN0..15 clear WKUPT0..15 General-Purpose Backup Registers WKUPDBC ONREG VROFF wake_up VDDIN Voltage Regulator Controller on/off Core Voltage Regulator VDDOUT SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 329 18.4 Functional Description 18.4.1 Overview The device is divided into two power supply areas: VDDIO power supply: includes the Supply Controller, part of the Reset Controller, the slow clock switch, the general-purpose backup registers, the supply monitor and the clock which includes the Real-time Timer and the Real-time Clock. Core power supply: includes part of the Reset Controller, the Brownout Detector, the processor, the SRAM memory, the Flash memory and the peripherals. The Supply Controller (SUPC) controls the supply voltage of the core power supply. The SUPC intervenes when the VDDIO power supply rises (when the system is starting) or when Backup mode is entered. The SUPC also integrates the slow clock generator, which is based on a 32 kHz crystal oscillator, and an embedded 32 kHz RC oscillator. The slow clock defaults to the RC oscillator, but the software can enable the crystal oscillator and select it as the slow clock source. The SUPC and the VDDIO power supply have a reset circuitry based on a zero-power power-on reset cell. The zero-power power-on reset allows the SUPC to start correctly as soon as the VDDIO voltage becomes valid. At start-up of the system, once the backup voltage VDDIO is valid and the embedded 32 kHz RC oscillator is stabilized, the SUPC starts up the core by sequentially enabling the internal voltage regulator. The SUPC waits until the core voltage VDDCORE is valid, then releases the reset signal of the core vddcore_nreset signal. Once the system has started, the user can program a supply monitor and/or a brownout detector. If the supply monitor detects a voltage level on VDDIO that is too low, the SUPC asserts the reset signal of the core vddcore_nreset signal until VDDIO is valid. Likewise, if the brownout detector detects a core voltage level VDDCORE that is too low, the SUPC asserts the reset signal vddcore_nreset until VDDCORE is valid. When Backup mode is entered, the SUPC sequentially asserts the reset signal of the core power supply vddcore_nreset and disables the voltage regulator, in order to supply only the VDDIO power supply. Current consumption is reduced to a few microamps for the backup part retention. Exit from this mode is possible on multiple wake-up sources including an event on WKUP pins, or a clock alarm. To exit this mode, the SUPC operates in the same way as system start-up. 330 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 18.4.2 Slow Clock Generator The SUPC embeds a slow clock generator that is supplied with the VDDIO power supply. As soon as the VDDIO is supplied, both the crystal oscillator and the embedded RC oscillator are powered up, but only the embedded RC oscillator is enabled. When the RC oscillator is selected as the slow clock source, the slow clock stabilizes more quickly than when the crystal oscillator is selected. The user can select the crystal oscillator to be the source of the slow clock, as it provides a more accurate frequency than the RC oscillator. The crystal oscillator is selected by setting the XTALSEL bit in the SUPC Control register (SUPC_CR). The following sequence must be used to switch from the RC oscillator to the crystal oscillator: 1. The PIO lines multiplexed with XIN32 and XOUT32 are configured to be driven by the oscillator. 2. The crystal oscillator is enabled. 3. A number of slow RC oscillator clock periods is counted to cover the start-up time of the crystal oscillator (refer to the Electrical Characteristics for information on 32 kHz crystal oscillator start-up time). 4. The slow clock is switched to the output of the crystal oscillator. 5. The RC oscillator is disabled to save power. The switching time may vary depending on the slow RC oscillator clock frequency range. The switch of the slow clock source is glitch-free. The OSCSEL bit of the SUPC Status register (SUPC_SR) indicates when the switch sequence is finished. Reverting to the RC oscillator as a slow clock source is only possible by shutting down the VDDIO power supply. If the user does not need the crystal oscillator, the XIN32 and XOUT32 pins should be left unconnected. The user can also set the crystal oscillator in Bypass mode instead of connecting a crystal. In this case, the user has to provide the external clock signal on XIN32. The input characteristics of the XIN32 pin are given in the section `Electrical Characteristics. To enter Bypass mode, the OSCBYPASS bit in the Mode register (SUPC_MR) must be set before setting XTALSEL. 18.4.3 Core Voltage Regulator Control/Backup Low-power Mode The SUPC can be used to control the embedded voltage regulator. The voltage regulator automatically adapts its quiescent current depending on the required load current. More information can be found in the Electrical Characteristics. The user can switch off the voltage regulator, and thus put the device in Backup mode, by writing a 1 to the VROFF bit in SUPC_CR. This asserts the vddcore_nreset signal after the write resynchronization time, which lasts two slow clock cycles (worst case). Once the vddcore_nreset signal is asserted, the processor and the peripherals are stopped one slow clock cycle before the core power supply shuts off. When the internal voltage regulator is not used and VDDCORE is supplied by an external supply, the voltage regulator can be disabled by writing a 1 to the ONREG bit in SUPC_MR. 18.4.4 Supply Monitor The SUPC embeds a supply monitor located in the VDDIO power supply and which monitors VDDIO power supply. The supply monitor can be used to prevent the processor from falling into an unpredictable state if the main power supply drops below a certain level. The threshold of the supply monitor is programmable in the SMTH field of the Supply Monitor Mode register (SUPC_SMMR). Refer to the VDDIO Supply Monitor characteristics in the section Electrical Characteristics. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 331 The supply monitor can also be enabled during one slow clock period on every one of either 32, 256 or 2048 slow clock periods, depending on the user selection. This is configured in the SMSMPL field in SUPC_SMMR. Enabling the supply monitor for such reduced times divides the typical supply monitor power consumption by factors of 2, 16 and 128, respectively, if continuous monitoring of the VDDIO power supply is not required. A supply monitor detection generates either a reset of the core power supply or a wake-up of the core power supply. Generating a core reset when a supply monitor detection occurs is enabled by setting the SMRSTEN bit in SUPC_SMMR. Waking up the core power supply when a supply monitor detection occurs can be enabled by setting the SMEN bit in the Wake-up Mode register (SUPC_WUMR). The SUPC provides two status bits in the SUPC_SR for the supply monitor that determine whether the last wakeup was due to the supply monitor: The SMOS bit provides real-time information, updated at each measurement cycle or updated at each slow clock cycle, if the measurement is continuous. The SMS bit provides saved information and shows a supply monitor detection has occurred since the last read of SUPC_SR. The SMS flag generates an interrupt if the SMIEN bit is set in SUPC_SMMR. Figure 18-2. Supply Monitor Status Bit and Associated Interrupt Continuous Sampling (SMSMPL = 1) Periodic Sampling Supply Monitor ON 3.3 V Threshold 0V Read SUPC_SR SMS and SUPC interrupt 18.4.5 Backup Power Supply Reset 18.4.5.1 Raising the Backup Power Supply When the backup voltage VDDIO rises, the RC oscillator is powered up and the zero-power power-on reset cell maintains its output low as long as VDDIO has not reached its target voltage. During this period, the SUPC is reset. When the VDDIO voltage becomes valid and the zero-power power-on reset signal is released, a counter is started for five slow clock cycles. This is the time required for the 32 kHz RC oscillator to stabilize. After this time, the voltage regulator is enabled. The core power supply rises and the brownout detector provides the bodcore_in signal as soon as the core voltage VDDCORE is valid. This results in releasing the vddcore_nreset signal to the Reset Controller after the bodcore_in signal has been confirmed as being valid for at least one slow clock cycle. 332 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 18-3. Raising the VDDIO Power Supply TON Voltage 7 x Slow Clock Cycles (5 for startup slow RC + 2 for synchro.) Regulator 3 x Slow Clock 2 x Slow Clock Cycles Cycles 6.5 x Slow Clock Cycles Zero-Power POR Backup Power Supply Zero-Power Power-On Reset Cell output 22 - 42 kHz RC Oscillator output vr_on Core Power Supply Fast RC Oscillator output bodcore_in vddcore_nreset RSTC.ERSTL default = 2 NRST (no ext. drive assumed) periph_nreset proc_nreset Note: After "proc_nreset" rising, the core starts fetching instructions from Flash at 4 MHz. 18.4.6 Core Reset The Supply Controller manages the vddcore_nreset signal to the Reset Controller, as described in Section 18.4.5 "Backup Power Supply Reset". The vddcore_nreset signal is normally asserted before shutting down the core power supply and released as soon as the core power supply is correctly regulated. There are two additional sources which can be programmed to activate vddcore_nreset: 18.4.6.1 a supply monitor detection a brownout detection Supply Monitor Reset The supply monitor is capable of generating a reset of the system. This is enabled by setting the SMRSTEN bit in SUPC_SMMR. If SMRSTEN is set and if a supply monitor detection occurs, the vddcore_nreset signal is immediately activated for a minimum of one slow clock cycle. 18.4.6.2 Brownout Detector Reset The brownout detector provides the bodcore_in signal to the SUPC. This signal indicates that the voltage regulation is operating as programmed. If this signal is lost for longer than 1 slow clock period while the voltage regulator is enabled, the SUPC asserts vddcore_nreset if BODRSTEN is written to 1 in SUPC_MR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 333 If BODRSTEN is set and the voltage regulation is lost (output voltage of the regulator too low), the vddcore_nreset signal is asserted for a minimum of one slow clock cycle and then released if bodcore_in has been reactivated. The BODRSTS bit in SUPC_SR indicates the source of the last reset. Until bodcore_in is deactivated, the vddcore_nreset signal remains active. 18.4.7 Wake-up Sources The wake-up events allow the device to exit Backup mode. When a wake-up event is detected, the SUPC performs a sequence that automatically reenables the core power supply. Figure 18-4. Wake-up Sources SMEN sm_out RTCEN rtc_alarm RTTEN rtt_alarm Low-power Tamper Detection Logic LPDBC WKUPT1 RTCOUT0 Debouncer WKUPT0 LPDBC LPDBCEN0 RTCOUT0 LPDBCS0 Falling/Rising Edge Detect WKUPT0 WKUP0 LPDBCS1 LPDBCEN1 Falling/Rising Edge Detect WKUPEN0 Debouncer WKUPIS0 WKUPDBC Falling/Rising Edge Detect WKUPT1 Core Supply Restart SLCK WKUPEN1 WKUPS WKUPIS1 Debouncer WKUP1 Falling/Rising Edge Detect LPDBCS1 LPDBCS0 WKUPT15 WKUP15 18.4.7.1 WKUPEN15 WKUPIS15 GPBR Clear LPDBCCLR Falling/Rising Edge Detect Wake-up Inputs The wake-up inputs, WKUPx, can be programmed to perform a wake-up of the core power supply. Each input can be enabled by writing a 1 to the corresponding bit, WKUPENx, in the Wake-up Inputs register (SUPC_WUIR). The wake-up level can be selected with the corresponding polarity bit, WKUPTx, also located in SUPC_WUIR. The resulting signals are wired-ORed to trigger a debounce counter, which is programmed with the WKUPDBC field in SUPC_WUMR. The WKUPDBC field selects a debouncing period of 3, 32, 512, 4,096 or 32,768 slow clock cycles. The duration of these periods corresponds, respectively, to about 100 s, about 1 ms, about 16 ms, about 128 ms and about 1 second (for a typical slow clock frequency of 32 kHz). Programming WKUPDBC to 0x0 selects an immediate wake-up, i.e., an enabled WKUP pin must be active according to its polarity during a minimum of one slow clock period to wake up the core power supply. 334 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 If an enabled WKUP pin is asserted for a duration longer than the debouncing period, a wake-up of the core power supply is started and the signals, WKUP0 to WKUPx as shown in Figure 18-4 "Wake-up Sources", are latched in SUPC_SR. This allows the user to identify the source of the wake-up. However, if a new wake-up condition occurs, the primary information is lost. No new wake-up can be detected since the primary wake-up condition has disappeared. Before instructing the system to enter Backup mode, if the field WKUPDBC > 0, it must be checked that none of the WKUPx pins that are enabled for a wake-up (exit from Backup mode) holds an active polarity. This is checked by reading the pin status in the PIO Controller. If WKUPENx=1 and the pin WKUPx holds an active polarity, the system must not be instructed to enter Backup mode. Figure 18-5. Entering and Exiting Backup Mode with a WKUP Pin WKUPDBC > 0 WKUPTx=0 Edge detect + debounce time WKUPx Edge detect + debounce time VROFF=1 VROFF=1 System Active BACKUP Active BACKUP active runtime Active active runtime BACKUP check WKUPx status check WKUPx status 18.4.7.2 Low-power Tamper Detection and Anti-Tampering Low-power debouncer inputs (WKUP0, WKUP1) can be used for tamper detection. If the tamper sensor is biased through a resistor and constantly driven by the power supply, this leads to power consumption as long as the tamper detection switch is in its active state. To prevent power consumption when the switch is in active state, the tamper sensor circuitry must be intermittently powered, and thus a specific waveform must be applied to the sensor circuitry. The waveform is generated using RTCOUTx in all modes including Backup mode. Refer to the RTC section for waveform generation. Separate debouncers are embedded, one for WKUP0 input, one for WKUP1 input. The WKUP0 and/or WKUP1 inputs perform a system wake-up upon tamper detection. This is enabled by setting the LPDBCEN0/1 bit in the SUPC_WUMR. WKUP0 and/or WKUP1 inputs can also be used when VDDCORE is powered to detect a tamper. When the bit LPDBCENx is written to 1, WKUPx pins must not be configured to act as a debouncing source for the WKUPDBC counter (WKUPENx must be cleared in SUPC_WUIR). Low-power tamper detection or debounce requires RTC output (RTCOUTx) to be configured to generate a duty cycle programmable pulse (i.e., OUT0 = 0x7 in RTC_MR) in order to create the sampling points of both debouncers. The sampling point is the falling edge of the RTCOUTx waveform. Figure 18-6 shows an example of an application where two tamper switches are used. RTCOUTx powers the external pull-up used by the tamper sensor circuitry. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 335 Figure 18-6. Low-power Debouncer (Push-to-Make Switch, Pull-up Resistors) MCU RTCOUTx Pull-up Resistor WKUP0 Pull-up Resistor GND WKUP1 GND GND Figure 18-7. Low-power Debouncer (Push-to-Break Switch, Pull-down Resistors) MCU RTCOUTx WKUP0 WKUP1 Pull-down Resistors GND GND GND The debouncing period duration is configurable. The period is set for all debouncers (i.e., the duration cannot be adjusted for each debouncer). The number of successive identical samples to wake up the system can be configured from 2 up to 8 in the LPDBC field of SUPC_WUMR. The period of time between two samples can be configured by programming the TPERIOD field in the RTC_MR. Power parameters can be adjusted by modifying the period of time in the THIGH field in RTC_MR. The wake-up polarity of the inputs can be independently configured by writing WKUPT0 and/ or WKUPT1 fields in SUPC_WUMR. In order to determine which wake-up/tamper pin triggers the system wake-up, a status flag is associated for each low-power debouncer. These flags are read in SUPC_SR. A debounce event (tamper detection) can perform an immediate clear (0 delay) on the first half the generalpurpose backup registers (GPBR). The LPDBCCLR bit must be set in SUPC_WUMR. Note that it is not mandatory to use the RTCOUTx pin when using the WKUP0/WKUP1 pins as tampering inputs in any mode. Using the RTCOUTx pin provides a "sampling mode" to further reduce the power consumption of the 336 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 tamper detection circuitry. If RTCOUTx is not used, the RTC must be configured to create an internal sampling point for the debouncer logic. The period of time between two samples can be configured by programming the TPERIOD field in RTC_MR. Figure 18-8 illustrates the use of WKUPx without the RTCOUTx pin. Figure 18-8. Using WKUP Pins Without RTCOUTx Pins VDDIO MCU Pull-up Resistor WKUP0 Pull-up Resistor GND WKUP1 GND GND 18.4.7.3 Clock Alarms The RTC and the RTT alarms can generate a wake-up of the core power supply. This can be enabled by setting, respectively, the bits RTCEN and RTTEN in SUPC_WUMR. The Supply Controller does not provide any status as the information is available in the user interface of either the Real-Time Timer or the Real-Time Clock. 18.4.7.4 Supply Monitor Detection The supply monitor can generate a wake-up of the core power supply. See Section 18.4.4 "Supply Monitor". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 337 18.4.8 Register Write Protection To prevent any single software error from corrupting SYSC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the "System Controller Write Protection Mode Register" (SYSC_WPMR). The following registers can be write-protected: RSTC Mode Register RTT Mode Register RTT Alarm Register RTC Control Register RTC Mode Register RTC Time Alarm Register RTC Calendar Alarm Register General Purpose Backup Registers Supply Controller Control Register Supply Controller Supply Monitor Mode Register Supply Controller Mode Register Supply Controller Wake-up Mode Register Supply Controller Wake-up Inputs Register 18.4.9 Register Bits in Backup Domain (VDDIO) The following configuration registers, or certain bits of the registers, are physically located in the product backup domain: 338 RSTC Mode Register (all bits) RTT Mode Register (all bits) RTT Alarm Register (all bits) RTC Control Register (all bits) RTC Mode Register (all bits) RTC Time Alarm Register (all bits) RTC Calendar Alarm Register (all bits) General Purpose Backup Registers (all bits) Supply Controller Control Register (see register description for details) Supply Controller Supply Monitor Mode Register (all bits) Supply Controller Mode Register (see register description for details) Supply Controller Wake-up Mode Register (all bits) Supply Controller Wake-up Inputs Register (all bits) Supply Controller Status Register (all bits) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 18.5 Supply Controller (SUPC) User Interface The user interface of the Supply Controller is part of the System Controller user interface. 18.5.1 System Controller (SYSC) User Interface Table 18-1. System Controller Registers Offset System Controller Peripheral Name 0x00-0x0c Reset Controller RSTC 0x10-0x2C Supply Controller SUPC 0x30-0x3C Real Time Timer RTT 0x50-0x5C Watchdog Timer WDT 0x60-0x8C Real Time Clock RTC 0x90-0xDC General Purpose Backup Register GPBR 0xE0 Reserved - 0xE4 Write Protection Mode Register SYSC_WPMR 0xE8-0xF8 Reserved - 18.5.2 Supply Controller (SUPC) User Interface Table 18-2. Register Mapping Offset Register Name Access Reset 0x00 Supply Controller Control Register SUPC_CR Write-only - 0x04 Supply Controller Supply Monitor Mode Register SUPC_SMMR Read/Write 0x0000_0000 0x08 Supply Controller Mode Register SUPC_MR Read/Write 0x0000_5A00 0x0C Supply Controller Wake-up Mode Register SUPC_WUMR Read/Write 0x0000_0000 0x10 Supply Controller Wake-up Inputs Register SUPC_WUIR Read/Write 0x0000_0000 0x14 Supply Controller Status Register SUPC_SR Read-only 0x0000_0000 0x18 Reserved - - - SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 339 18.5.3 Supply Controller Control Register Name: SUPC_CR Address: 0x400E1410 Access: Write-only 31 30 29 28 27 26 25 24 KEY 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 XTALSEL 2 VROFF 1 - 0 - This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_MR). * VROFF: Voltage Regulator Off 0 (NO_EFFECT): No effect. 1 (STOP_VREG): If KEY is correct, VROFF asserts the vddcore_nreset and stops the voltage regulator. Note: This bit is located in the VDDIO domain. * XTALSEL: Crystal Oscillator Select 0 (NO_EFFECT): No effect. 1 (CRYSTAL_SEL): If KEY is correct, XTALSEL switches the slow clock on the crystal oscillator output. Note: This bit is located in the VDDIO domain. * KEY: Password 340 Value Name 0xA5 PASSWD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Description Writing any other value in this field aborts the write operation. 18.5.4 Supply Controller Supply Monitor Mode Register Name: SUPC_SMMR Address: 0x400E1414 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 SMIEN 12 SMRSTEN 11 - 10 9 SMSMPL 8 7 - 6 - 5 - 4 - 3 2 1 0 SMTH This register is located in the VDDIO domain. This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_MR). * SMTH: Supply Monitor Threshold Selects the threshold voltage of the supply monitor. Refer to the Electrical Characteristics for voltage values. * SMSMPL: Supply Monitor Sampling Period Value Name Description 0x0 SMD Supply Monitor disabled 0x1 CSM Continuous Supply Monitor 0x2 32SLCK Supply Monitor enabled one SLCK period every 32 SLCK periods 0x3 256SLCK Supply Monitor enabled one SLCK period every 256 SLCK periods 0x4 2048SLCK Supply Monitor enabled one SLCK period every 2,048 SLCK periods * SMRSTEN: Supply Monitor Reset Enable 0 (NOT_ENABLE): The core reset signal vddcore_nreset is not affected when a supply monitor detection occurs. 1 (ENABLE): The core reset signal, vddcore_nreset is asserted when a supply monitor detection occurs. * SMIEN: Supply Monitor Interrupt Enable 0 (NOT_ENABLE): The SUPC interrupt signal is not affected when a supply monitor detection occurs. 1 (ENABLE): The SUPC interrupt signal is asserted when a supply monitor detection occurs. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 341 18.5.5 Supply Controller Mode Register Name: SUPC_MR Address: 0x400E1418 Access: Read/Write 31 30 29 28 27 26 25 24 KEY 23 - 22 - 21 - 20 OSCBYPASS 19 - 18 - 17 - 16 - 15 - 14 ONREG 13 BODDIS 12 BODRSTEN 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_MR). * BODRSTEN: Brownout Detector Reset Enable 0 (NOT_ENABLE): The core reset signal vddcore_nreset is not affected when a brownout detection occurs. 1 (ENABLE): The core reset signal, vddcore_nreset is asserted when a brownout detection occurs. Note: This bit is located in the VDDIO domain. * BODDIS: Brownout Detector Disable 0 (ENABLE): The core brownout detector is enabled. 1 (DISABLE): The core brownout detector is disabled. Note: This bit is located in the VDDIO domain. * ONREG: Voltage Regulator Enable 0 (ONREG_UNUSED): Internal voltage regulator is not used (external power supply is used). 1 (ONREG_USED): Internal voltage regulator is used. Note: This bit is located in the VDDIO domain. * OSCBYPASS: Oscillator Bypass 0 (NO_EFFECT): No effect. Clock selection depends on the value of XTALSEL (SUPC_CR). 1 (BYPASS): The 32 kHz crystal oscillator is bypassed if XTALSEL (SUPC_CR) is set. OSCBYPASS must be set prior to setting XTALSEL. Note: This bit is located in the VDDIO domain. * KEY: Password Key 342 Value Name 0xA5 PASSWD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Description Writing any other value in this field aborts the write operation. 18.5.6 Supply Controller Wake-up Mode Register Name: SUPC_WUMR Address: 0x400E141C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 17 LPDBC 16 15 - 14 13 WKUPDBC 12 11 - 10 - 9 - 8 - 7 LPDBCCLR 6 LPDBCEN1 5 LPDBCEN0 4 - 3 RTCEN 2 RTTEN 1 SMEN 0 - This register is located in the VDDIO domain. This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_MR). * SMEN: Supply Monitor Wake-up Enable 0 (NOT_ENABLE): The supply monitor detection has no wake-up effect. 1 (ENABLE): The supply monitor detection forces the wake-up of the core power supply. * RTTEN: Real-time Timer Wake-up Enable 0 (NOT_ENABLE): The RTT alarm signal has no wake-up effect. 1 (ENABLE): The RTT alarm signal forces the wake-up of the core power supply. * RTCEN: Real-time Clock Wake-up Enable 0 (NOT_ENABLE): The RTC alarm signal has no wake-up effect. 1 (ENABLE): The RTC alarm signal forces the wake-up of the core power supply. * LPDBCEN0: Low-power Debouncer Enable WKUP0 0 (NOT_ENABLE): The WKUP0 input pin is not connected to the low-power debouncer. 1 (ENABLE): The WKUP0 input pin is connected to the low-power debouncer and forces a system wake-up. * LPDBCEN1: Low-power Debouncer Enable WKUP1 0 (NOT_ENABLE): The WKUP1 input pin is not connected to the low-power debouncer. 1 (ENABLE): The WKUP1 input pin is connected to the low-power debouncer and forces a system wake-up. * LPDBCCLR: Low-power Debouncer Clear 0 (NOT_ENABLE): A low-power debounce event does not create an immediate clear on the first half of GPBR registers. 1 (ENABLE): A low-power debounce event on WKUP0 or WKUP1 generates an immediate clear on the first half of GPBR registers. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 343 * WKUPDBC: Wake-up Inputs Debouncer Period Value Name Description 0 IMMEDIATE 1 3_SCLK WKUPx shall be in its active state for at least 3 SLCK periods 2 32_SCLK WKUPx shall be in its active state for at least 32 SLCK periods 3 512_SCLK WKUPx shall be in its active state for at least 512 SLCK periods 4 4096_SCLK WKUPx shall be in its active state for at least 4,096 SLCK periods 5 32768_SCLK WKUPx shall be in its active state for at least 32,768 SLCK periods Immediate, no debouncing, detected active at least on one Slow Clock edge. * LPDBC: Low-power Debouncer Period 344 Value Name 0 DISABLE 1 2_RTCOUT0 WKUP0/1 in active state for at least 2 RTCOUTx clock periods 2 3_RTCOUT0 WKUP0/1 in active state for at least 3 RTCOUTx clock periods 3 4_RTCOUT0 WKUP0/1 in active state for at least 4 RTCOUTx clock periods 4 5_RTCOUT0 WKUP0/1 in active state for at least 5 RTCOUTx clock periods 5 6_RTCOUT0 WKUP0/1 in active state for at least 6 RTCOUTx clock periods 6 7_RTCOUT0 WKUP0/1 in active state for at least 7 RTCOUTx clock periods 7 8_RTCOUT0 WKUP0/1 in active state for at least 8 RTCOUTx clock periods SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Description Disable the low-power debouncers. 18.5.7 Supply Controller Wake-up Inputs Register Name: SUPC_WUIR Address: 0x400E1420 Access: Read/Write 31 WKUPT15 30 WKUPT14 29 WKUPT13 28 WKUPT12 27 WKUPT11 26 WKUPT10 25 WKUPT9 24 WKUPT8 23 WKUPT7 22 WKUPT6 21 WKUPT5 20 WKUPT4 19 WKUPT3 18 WKUPT2 17 WKUPT1 16 WKUPT0 15 WKUPEN15 14 WKUPEN14 13 WKUPEN13 12 WKUPEN12 11 WKUPEN11 10 WKUPEN10 9 WKUPEN9 8 WKUPEN8 7 WKUPEN7 6 WKUPEN6 5 WKUPEN5 4 WKUPEN4 3 WKUPEN3 2 WKUPEN2 1 WKUPEN1 0 WKUPEN0 This register is located in the VDDIO domain. This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_MR). * WKUPEN0 - WKUPENx: Wake-up Input Enable 0 to x 0 (DISABLE): The corresponding wake-up input has no wake-up effect. 1 (ENABLE): The corresponding wake-up input is enabled for a wake-up of the core power supply. * WKUPT0 - WKUPTx: Wake-up Input Type 0 to x 0 (LOW): A falling edge followed by a low level for a period defined by WKUPDBC on the corresponding wake-up input forces the wake-up of the core power supply. 1 (HIGH): A rising edge followed by a high level for a period defined by WKUPDBC on the corresponding wake-up input forces the wake-up of the core power supply. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 345 18.5.8 Supply Controller Status Register Name: SUPC_SR Address: 0x400E1424 Access: Read-only 31 WKUPIS15 30 WKUPIS14 29 WKUPIS13 28 WKUPIS12 27 WKUPIS11 26 WKUPIS10 25 WKUPIS9 24 WKUPIS8 23 WKUPIS7 22 WKUPIS6 21 WKUPIS5 20 WKUPIS4 19 WKUPIS3 18 WKUPIS2 17 WKUPIS1 16 WKUPIS0 15 - 14 LPDBCS1 13 LPDBCS0 12 - 11 - 10 - 9 - 8 - 7 OSCSEL 6 SMOS 5 SMS 4 SMRSTS 3 BODRSTS 2 SMWS 1 WKUPS 0 - Note: Because of the asynchronism between the Slow Clock (SLCK) and the System Clock (MCK), the status register flag reset is taken into account only 2 slow clock cycles after the read of the SUPC_SR. This register is located in the VDDIO domain. * WKUPS: WKUP Wake-up Status (cleared on read) 0 (NO): No wake-up due to the assertion of the WKUP pins has occurred since the last read of SUPC_SR. 1 (PRESENT): At least one wake-up due to the assertion of the WKUP pins has occurred since the last read of SUPC_SR. * SMWS: Supply Monitor Detection Wake-up Status (cleared on read) 0 (NO): No wake-up due to a supply monitor detection has occurred since the last read of SUPC_SR. 1 (PRESENT): At least one wake-up due to a supply monitor detection has occurred since the last read of SUPC_SR. * BODRSTS: Brownout Detector Reset Status (cleared on read) 0 (NO): No core brownout rising edge event has been detected since the last read of the SUPC_SR. 1 (PRESENT): At least one brownout output rising edge event has been detected since the last read of the SUPC_SR. When the voltage remains below the defined threshold, there is no rising edge event at the output of the brownout detection cell. The rising edge event occurs only when there is a voltage transition below the threshold. * SMRSTS: Supply Monitor Reset Status (cleared on read) 0 (NO): No supply monitor detection has generated a core reset since the last read of the SUPC_SR. 1 (PRESENT): At least one supply monitor detection has generated a core reset since the last read of the SUPC_SR. * SMS: Supply Monitor Status (cleared on read) 0 (NO): No supply monitor detection since the last read of SUPC_SR. 1 (PRESENT): At least one supply monitor detection since the last read of SUPC_SR. * SMOS: Supply Monitor Output Status 0 (HIGH): The supply monitor detected VDDIO higher than its threshold at its last measurement. 1 (LOW): The supply monitor detected VDDIO lower than its threshold at its last measurement. 346 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * OSCSEL: 32-kHz Oscillator Selection Status 0 (RC): The slow clock, SLCK, is generated by the embedded 32 kHz RC oscillator. 1 (CRYST): The slow clock, SLCK, is generated by the 32 kHz crystal oscillator. * LPDBCS0: Low-power Debouncer Wake-up Status on WKUP0 (cleared on read) 0 (NO): No wake-up due to the assertion of the WKUP0 pin has occurred since the last read of SUPC_SR. 1 (PRESENT): At least one wake-up due to the assertion of the WKUP0 pin has occurred since the last read of SUPC_SR. * LPDBCS1: Low-power Debouncer Wake-up Status on WKUP1 (cleared on read) 0 (NO): No wake-up due to the assertion of the WKUP1 pin has occurred since the last read of SUPC_SR. 1 (PRESENT): At least one wake-up due to the assertion of the WKUP1 pin has occurred since the last read of SUPC_SR. * WKUPISx: WKUPx Input Status (cleared on read) 0 (DIS): The corresponding wake-up input is disabled, or was inactive at the time the debouncer triggered a wake-up event. 1 (EN): The corresponding wake-up input was active at the time the debouncer triggered a wake-up event since the last read of SUPC_SR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 347 18.5.9 System Controller Write Protection Mode Register Name: SYSC_WPMR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x525443 ("RTC" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x525443 ("RTC" in ASCII). See Section 18.4.8 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protection Key. Value Name 0x525443 PASSWD 348 Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 19. General Purpose Backup Registers (GPBR) 19.1 Description The System Controller embeds 256 bits of General Purpose Backup registers organized as Eight 32-bit registers. It is possible to generate an immediate clear of the content of General Purpose Backup registers 0 to 3 (first half) if a Low-power Debounce event is detected on one of the wakeup pins, WKUP0 or WKUP1. The content of the other General Purpose Backup registers (second half) remains unchanged. The Supply Controller module must be programmed accordingly. In the register SUPC_WUMR in the Supply Controller module, LPDBCCLR, LPDBCEN0 and/or LPDBCEN1 bit must be configured to 1 and LPDBC must be other than 0. If a Tamper event has been detected, it is not possible to write to the General Purpose Backup registers while the LPDBCS0 or LPDBCS1 flags are not cleared in the Supply Controller Status Register (SUPC_SR). 19.2 Embedded Characteristics 256 bits of General Purpose Backup Registers SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 349 19.3 General Purpose Backup Registers (GPBR) User Interface Table 19-1. Offset 0x0 ... 0x1C 350 Register Mapping Register Name General Purpose Backup Register 0 SYS_GPBR0 ... ... General Purpose Backup Register 7 SYS_GPBR7 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Access Reset Read/Write 0x00000000 ... ... Read/Write 0x00000000 19.3.1 General Purpose Backup Register x Name: SYS_GPBRx Address: 0x400E1490 Access: Read/Write 31 30 29 28 27 26 25 24 18 17 16 10 9 8 2 1 0 GPBR_VALUE 23 22 21 20 19 GPBR_VALUE 15 14 13 12 11 GPBR_VALUE 7 6 5 4 3 GPBR_VALUE These registers are reset at first power-up and on each loss of VVDIO. * GPBR_VALUE: Value of GPBR x If a Tamper event has been detected, it is not possible to write GPBR_VALUE as long as the LPDBCS0 or LPDBCS1 flag has not been cleared in the Supply Controller Status Register (SUPC_SR). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 351 20. Enhanced Embedded Flash Controller (EEFC) 20.1 Description The Enhanced Embedded Flash Controller (EEFC) provides the interface of the Flash block with the 32-bit internal bus. Its 128-bit or 64-bit wide memory interface increases performance. It also manages the programming, erasing, locking and unlocking sequences of the Flash using a full set of commands. One of the commands returns the embedded Flash descriptor definition that informs the system about the Flash organization, thus making the software generic. 20.2 20.3 Embedded Characteristics Increases Performance in Thumb-2 Mode with 128-bit or 64-bit-wide Memory Interface up to 120 MHz Code Loop Optimization 256 Lock Bits, Each Protecting a Lock Region GPNVMx General-purpose GPNVM Bits One-by-one Lock Bit Programming Commands Protected by a Keyword Erase the Entire Flash Erase by Plane Erase by Sector Erase by Page Provides Unique Identifier Provides 512-byte User Signature Area Supports Erasing before Programming Locking and Unlocking Operations Supports Read of the Calibration Bits Product Dependencies 20.3.1 Power Management The Enhanced Embedded Flash Controller (EEFC) is continuously clocked. The Power Management Controller has no effect on its behavior. 20.3.2 Interrupt Sources The EEFC interrupt line is connected to the interrupt controller. Using the EEFC interrupt requires the interrupt controller to be programmed first. The EEFC interrupt is generated only if the value of bit EEFC_FMR.FRDY is 1. Table 20-1. 352 Peripheral IDs Instance ID EFC0 6 EFC1 7 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 20.4 Functional Description 20.4.1 Embedded Flash Organization The embedded Flash interfaces directly with the internal bus. The embedded Flash is composed of: One memory plane organized in several pages of the same size for the code A separate 2 x 512-byte memory area which includes the unique chip identifier A separate 512-byte memory area for the user signature Two 128-bit or 64-bit read buffers used for code read optimization One 128-bit or 64-bit read buffer used for data read optimization One write buffer that manages page programming. The write buffer size is equal to the page size. This buffer is write-only and accessible all along the 1 Mbyte address space, so that each word can be written to its final address. Several lock bits used to protect write/erase operation on several pages (lock region). A lock bit is associated with a lock region composed of several pages in the memory plane. Several bits that may be set and cleared through the EEFC interface, called general-purpose non-volatile memory bits (GPNVM bits) The embedded Flash size, the page size, the organization of lock regions and the definition of GPNVM bits are specific to the device. The EEFC returns a descriptor of the Flash controller after a `Get Flash Descriptor' command has been issued by the application (see Section 20.4.3.1 "Get Flash Descriptor Command"). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 353 Flash Memory Areas C od e Ar ea Figure 20-1. @FBA+0x010 @FBA+0x000 Write "Stop Unique Identifier" (Flash Command SPUI) U ni qu e Id en tif ie rA re a @FBA+0x3FF Write "Start Unique Identifier" (Flash Command STUI) @FBA+0x010 Unique Identifier @FBA+0x000 Write "Stop User signature" (Flash Command SPUS) Write "Start User Signature" (Flash Command STUS) U se rS ig na tu re Ar ea @FBA+0x1FF 354 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 @FBA+0x000 FBA = Flash Base Address Figure 20-2. Organization of Embedded Flash for Code Memory Plane Start Address Page 0 Lock Region 0 Lock Bit 0 Lock Region 1 Lock Bit 1 Lock Region (n-1) Lock Bit (n-1) Page (m-1) Start Address + Flash size -1 Page (n*m-1) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 355 20.4.2 Read Operations An optimized controller manages embedded Flash reads, thus increasing performance when the processor is running in Thumb-2 mode by means of the 128- or 64-bit-wide memory interface. The Flash memory is accessible through 8-, 16- and 32-bit reads. As the Flash block size is smaller than the address space reserved for the internal memory area, the embedded Flash wraps around the address space and appears to be repeated within it. The read operations can be performed with or without wait states. Wait states must be programmed in the field FWS in the Flash Mode register (EEFC_FMR). Defining FWS as 0 enables the single-cycle access of the embedded Flash. For mre details, refer to the section "Electrical Characteristics" of this datasheet. 20.4.2.1 128- or 64-bit Access Mode By default, the read accesses of the Flash are performed through a 128-bit wide memory interface. It improves system performance especially when two or three wait states are needed. For systems requiring only 1 wait state, or to focus on current consumption rather than performance, the user can select a 64-bit wide memory access via the bit EEFC_FMR.FAM. For more details, refer to the section "Electrical Characteristics" of this datasheet. 20.4.2.2 Code Read Optimization Code read optimization is enabled if the bit EEFC_FMR.SCOD is cleared. A system of 2 x 128-bit or 2 x 64-bit buffers is added in order to optimize sequential code fetch. Note: Immediate consecutive code read accesses are not mandatory to benefit from this optimization. The sequential code read optimization is enabled by default. If the bit EEFC_FMR.SCOD is set to 1, these buffers are disabled and the sequential code read is no longer optimized. Another system of 2 x 128-bit or 2 x 64-bit buffers is added in order to optimize loop code fetch. Refer to Section 20.4.2.3 "Code Loop Optimization" for more details. Figure 20-3. Code Read Optimization for FWS = 0 Master Clock ARM Request (32-bit) @0 @+4 @ +8 @+12 @+16 @+20 @+24 @+28 @+32 anticipation of @16-31 Flash Access Buffer 0 (128 bits) Buffer 1 (128 bits) Data to ARM XXX Bytes 0-15 Bytes 16-31 XXX Bytes 32-47 Bytes 32-47 Bytes 0-15 XXX Bytes 0-3 Bytes 16-31 Bytes 4-7 Bytes 8-11 Bytes 12-15 Bytes 16-19 Note: When FWS is equal to 0, all the accesses are performed in a single-cycle access. 356 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Bytes 20-23 Bytes 24-27 Bytes 28-31 Figure 20-4. Code Read Optimization for FWS = 3 Master Clock ARM Request (32-bit) @+4 @+8 @+12 @+16 @+20 @+24 @+28 @+32 @+36 @+40 @+44 @+48 @+52 @0 wait 3 cycles before 128-bit data is stable @0/4/8/12 are ready Flash Access anticipation of @32-47 anticipation of @16-31 @16/20/24/28 are ready Bytes 0-15 Bytes 16-31 Buffer 0 (128 bits) Bytes 32-47 Bytes 0-15 Buffer 1 (128 bits) Bytes 32-47 Bytes 16-31 XXX XXX Data to ARM 0-3 Bytes 48-6 4-7 8-11 12-15 16-19 20-23 24-27 28-31 32-35 36-39 40-43 44-47 48-51 Note: When FWS is between 1 and 3, in case of sequential reads, the first access takes (FWS + 1) cycles. The following accesses take only one cycle. 20.4.2.3 Code Loop Optimization Code loop optimization is enabled when the bit EEFC_FMR.CLOE is set to 1. When a backward jump is inserted in the code, the pipeline of the sequential optimization is broken and becomes inefficient. In this case, the loop code read optimization takes over from the sequential code read optimization to prevent the insertion of wait states. The loop code read optimization is enabled by default. In EEFC_FMR, if the bit CLOE is reset to 0 or the bit SCOD is set to 1, these buffers are disabled and the loop code read is not optimized. When code loop optimization is enabled, if inner loop body instructions L0 to Ln are positioned from the 128-bit Flash memory cell Mb0 to the memory cell Mp1, after recognition of a first backward branch, the first two Flash memory cells Mb0 and Mb1 targeted by this branch are cached for fast access from the processor at the next loop iteration. Then by combining the sequential prefetch (described in Section 20.4.2.2 "Code Read Optimization") through the loop body with the fast read access to the loop entry cache, the entire loop can be iterated with no wait state. Figure 20-5 illustrates code loop optimization. Figure 20-5. Code Loop Optimization Backward address jump Flash Memory 128-bit words Mb0 B0 B1 Mb1 Mp0 Mp1 L0 L1 L2 L3 L4 L5 Ln-5 Ln-4 Ln-3 Ln-2 Ln-1 Ln B2 B3 B4 B5 B6 B7 P0 P1 P2 P3 P4 P5 2x128-bit loop entry cache P6 P7 2x128-bit prefetch buffer Mb0 Branch Cache 0 L0 Loop Entry instruction Mp0 Prefetch Buffer 0 Mb1 Branch Cache 1 Ln Loop End instruction Mp1 Prefetch Buffer 1 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 357 20.4.2.4 Data Read Optimization The organization of the Flash in 128 bits or 64 bits is associated with two 128-bit or 64-bit prefetch buffers and one 128-bit or 64-bit data read buffer, thus providing maximum system performance. This buffer is added in order to store the requested data plus all the data contained in the 128-bit or 64-bit aligned data. This speeds up sequential data reads if, for example, FWS is equal to 1 (see Figure 20-6). The data read optimization is enabled by default. If the bit EEFC_FMR.SCOD is set to 1, this buffer is disabled and the data read is no longer optimized. Note: Figure 20-6. No consecutive data read accesses are mandatory to benefit from this optimization. Data Read Optimization for FWS = 1 Master Clock ARM Request (32-bit) @Byte 0 @4 Flash Access XXX @ 12 @ 16 Bytes 0-15 XXX @ 20 @ 24 @ 28 4-7 8-11 @ 36 Bytes 32-47 Bytes 0-15 Bytes 0-3 @ 32 Bytes 16-31 XXX Buffer (128 bits) Data to ARM @8 Bytes 16-31 12-15 16-19 20-23 24-27 28-31 32-35 20.4.3 Flash Commands The EEFC offers a set of commands to manage programming the Flash memory, locking and unlocking lock regions, consecutive programming, locking and full Flash erasing, etc. The commands are listed in the following table. Table 20-2. 358 Set of Commands Command Value Mnemonic Get Flash descriptor 0x00 GETD Write page 0x01 WP Write page and lock 0x02 WPL Erase page and write page 0x03 EWP Erase page and write page then lock 0x04 EWPL Erase all 0x05 EA Erase pages 0x07 EPA Set lock bit 0x08 SLB Clear lock bit 0x09 CLB Get lock bit 0x0A GLB Set GPNVM bit 0x0B SGPB Clear GPNVM bit 0x0C CGPB SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 20-2. Set of Commands (Continued) Command Value Mnemonic Get GPNVM bit 0x0D GGPB Start read unique identifier 0x0E STUI Stop read unique identifier 0x0F SPUI Get CALIB bit 0x10 GCALB Erase sector 0x11 ES Write user signature 0x12 WUS Erase user signature 0x13 EUS Start read user signature 0x14 STUS Stop read user signature 0x15 SPUS In order to execute one of these commands, select the required command using the FCMD field in the Flash Command register (EEFC_FCR). As soon as EEFC_FCR is written, the FRDY flag and the FVALUE field in the Flash Result register (EEFC_FRR) are automatically cleared. Once the current command has completed, the FRDY flag is automatically set. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the corresponding interrupt line of the interrupt controller is activated. (Note that this is true for all commands except for the STUI command. The FRDY flag is not set when the STUI command has completed.) All the commands are protected by the same keyword, which must be written in the eight highest bits of EEFC_FCR. Writing EEFC_FCR with data that does not contain the correct key and/or with an invalid command has no effect on the whole memory plane, but the FCMDE flag is set in the Flash Status register (EEFC_FSR). This flag is automatically cleared by a read access to EEFC_FSR. When the current command writes or erases a page in a locked region, the command has no effect on the whole memory plane, but the FLOCKE flag is set in EEFC_FSR. This flag is automatically cleared by a read access to EEFC_FSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 359 Figure 20-7. Command State Chart Read Status: EEFC_FSR No Check if FRDY flag Set Yes Write FCMD and PAGENB in Flash Command Register Read Status: EEFC_FSR No Check if FRDY flag Set Yes Check if FLOCKE flag Set Yes Locking region violation No Check if FCMDE flag Set Yes Bad keyword violation No Command Successful 20.4.3.1 Get Flash Descriptor Command This command provides the system with information on the Flash organization. The system can take full advantage of this information. For instance, a device could be replaced by one with more Flash capacity, and so the software is able to adapt itself to the new configuration. To get the embedded Flash descriptor, the application writes the GETD command in EEFC_FCR. The first word of the descriptor can be read by the software application in EEFC_FRR as soon as the FRDY flag in EEFC_FSR rises. The next reads of EEFC_FRR provide the following word of the descriptor. If extra read operations to EEFC_FRR are done after the last word of the descriptor has been returned, the EEFC_FRR value is 0 until the next valid command. 360 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 20-3. Flash Descriptor Definition Symbol Word Index Description FL_ID 0 Flash interface description FL_SIZE 1 Flash size in bytes FL_PAGE_SIZE 2 Page size in bytes FL_NB_PLANE 3 Number of planes FL_PLANE[0] 4 Number of bytes in the plane FL_NB_LOCK 4 + FL_NB_PLANE Number of lock bits. A bit is associated with a lock region. A lock bit is used to prevent write or erase operations in the lock region. FL_LOCK[0] 4 + FL_NB_PLANE + 1 Number of bytes in the first lock region 20.4.3.2 Write Commands Several commands are used to program the Flash. Only 0 values can be programmed using Flash technology; 1 is the erased value. In order to program words in a page, the page must first be erased. Commands are available to erase the full memory plane or a given number of pages. With the EWP and EWPL commands, a page erase is done automatically before a page programming. After programming, the page (the entire lock region) can be locked to prevent miscellaneous write or erase sequences. The lock bit can be automatically set after page programming using WPL or EWPL commands. Data to be programmed in the Flash must be written in an internal latch buffer before writing the programming command in EEFC_FCR. Data can be written at their final destination address, as the latch buffer is mapped into the Flash memory address space and wraps around within this Flash address space. Byte and half-word AHB accesses to the latch buffer are not allowed. Only 32-bit word accesses are supported. 32-bit words must be written continuously, in either ascending or descending order. Writing the latch buffer in a random order is not permitted. This prevents mapping a C-code structure to the latch buffer and accessing the data of the structure in any order. It is instead recommended to fill in a C-code structure in SRAM and copy it in the latch buffer in a continuous order. Write operations in the latch buffer are performed with the number of wait states programmed for reading the Flash. The latch buffer is automatically re-initialized, i.e., written with logical 1, after execution of each programming command. However, after power-up, the latch buffer is not initialized. If only part of the page is to be written with user data, the remaining part must be erased (written with 1). The programming sequence is the following: 1. Write the data to be programmed in the latch buffer. 2. Write the programming command in EEFC_FCR. This automatically clears the bit EEFC_FSR.FRDY. 3. When Flash programming is completed, the bit EEFC_FSR.FRDY rises. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the EEFC is activated. Three errors can be detected in EEFC_FSR after a programming sequence: Command Error: A bad keyword has been written in EEFC_FCR. Lock Error: The page to be programmed belongs to a locked region. A command must be run previously to unlock the corresponding region. Flash Error: When programming is completed, the WriteVerify test of the Flash memory has failed. Only one page can be programmed at a time. It is possible to program all the bits of a page (full page programming) or only some of the bits of the page (partial page programming). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 361 Depending on the number of bits to be programmed within the page, the EEFC adapts the write operations required to program the Flash. When a `Write Page' (WP) command is issued, the EEFC starts the programming sequence and all the bits written at 0 in the latch buffer are cleared in the Flash memory array. During programming, i.e., until EEFC_FSR.FDRY rises, access to the Flash is not allowed. Full Page Programming To program a full page, all the bits of the page must be erased before writing the latch buffer and issuing the WP command. The latch buffer must be written in ascending order, starting from the first address of the page. See Figure 20-8 "Full Page Programming". Partial Page Programming To program only part of a page using the WP command, the following constraints must be respected: Data to be programmed must be contained in integer multiples of 64-bit address-aligned words. 64-bit words can be programmed only if all the corresponding bits in the Flash array are erased (at logical value 1). See Figure 20-9 "Partial Page Programming". Programming Bytes Individual bytes can be programmed using the Partial page programming mode. In this case, an area of 64 bits must be reserved for each byte. Refer to Figure 20-10 "Programming Bytes in the Flash". 362 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 20-8. Full Page Programming 32 bits wide 32 bits wide FF FF FF FF FF FF FF FF FF FF FF FF 0xX1C FF FF FF FF 0xX14 FF FF FF FF 0xX10 FF FF FF FF FF FF 0xX0C 0xX08 FF FF FE 0xX04 FF FF FF FF 0xX04 FE 0xX00 FF FF FF FF 0xX00 CA FE CA FE CA FE CA FE 0xX1C CA FE CA FE 0xX18 CA FE CA FE 0xX14 CA FE CA FE 0xX10 CA FE CA FE 0xX0C CA FE CA FE CA FE CA CA FE CA address space for Page N Before programming: Unerased page in Flash array 0xX18 0xX08 Step 1: Flash array after page erase DE CA DE CA DE CA DE CA 0xX1C DE CA DE CA 0xX18 DE DE CA CA DE DE CA CA 0xX14 0xX0C DE CA DE CA 0xX0C CA 0xX08 DE CA DE CA 0xX08 DE CA 0xX04 DE CA DE CA 0xX04 DE CA 0xX00 DE CA DE CA 0xX00 DE CA DE CA DE CA DE CA 0xX1C DE CA DE CA 0xX18 DE DE CA CA DE DE CA CA 0xX14 DE CA DE CA DE CA DE DE CA DE CA 0xX10 address space for latch buffer Step 2: Writing a page in the latch buffer 0xX10 address space for Page N Step 3: Page in Flash array after issuing WP command and FRDY=1 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 363 Figure 20-9. Partial Page Programming 32 bits wide 32 bits wide FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 0xX1C FF FF FF FF FF FF FF FF 0xX14 FF FF FF FF FF FF FF FF 0xX10 FF FF FF FF FF FF FF FF CA CA FE FE CA CA FE FE 0xX0C FF FF FF FF FF FF FF FF 0xX04 FF FF FF FF FF FF FF FF 0xX00 address space for Page N Step 1: Flash array after page erase 0xX18 0xX08 Step 2: Flash array after programming 64-bit at address 0xX08 (write latch buffer + WP) 32 bits wide FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF CA CA FE FE CA CA 364 32 bits wide FE FE FF FF FF FF 0xX1C CA FE CA FE 0xX1C 0xX18 CA FE CA FE 0xX18 FF 0xX14 CA FE CA FE 0xX14 FF FF 0xX10 CA FE CA FE 0xX10 CA CA FE FE 0xX0C CA FE CA FE 0xX0C 0xX08 CA FE CA FE 0xX08 FE FE 0xX04 CA FE CA FE 0xX04 0xX00 CA FE CA FE 0xX00 CA CA Step 3: Flash array after programming Step 4: Flash array after programming a second 64-bit data at address 0xX00 a 128-bit data word at address 0xX10 (write latch buffer + WP) (write latch buffer + WP) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 20-10. Programming Bytes in the Flash 32 bits wide 4 x 32 bits = 1 Flash word 4 x 32 bits = 1 Flash word 32 bits wide FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 0xX1C FF FF FF FF FF FF FF FF address space 0xX14 for Page N 0xX10 FF FF FF FF 0xX14 FF FF FF FF 0xX10 FF FF FF FF 0xX0C xx xx xx xx 0xX0C FF FF FF FF 0xX08 xx xx xx 55 0xX08 xx xx xx xx 0xX04 xx xx xx xx 0xX04 xx xx xx AA 0xX00 xx xx xx AA 0xX00 0xX1C 0xX18 0xX18 Step 1: Flash array after programming first byte (0xAA) Step 2: Flash array after programming second byte (0x55) 64-bit used at address 0xX00 (write latch buffer + WP) 64-bit used at address 0xX08 (write latch buffer + WP) Note: The byte location shown here is for example only, it can be any byte location within a 64-bit word. 20.4.3.3 Erase Commands Erase commands are allowed only on unlocked regions. Depending on the Flash memory, several commands can be used to erase the Flash: Erase All Memory (EA): All memory is erased. The processor must not fetch code from the Flash memory. Erase Pages (EPA): 8 or 16 pages are erased in the Flash sector selected. The first page to be erased is specified in the FARG[15:2] field of the EEFC_FCR. The first page number must be a multiple of 8, 16 or 32 depending on the number of pages to erase at the same time. Erase Sector (ES): A full memory sector is erased. Sector size depends on the Flash memory. EEFC_FCR.FARG must be set with a page number that is in the sector to be erased. If the processor is fetching code from the Flash memory while the EPA or ES command is being executed, the processor accesses are stalled until the EPA command is completed. To avoid stalling the processor, the code can be run out of internal SRAM. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 365 The erase sequence is the following: 1. Erase starts as soon as one of the erase commands and the FARG field are written in EEFC_FCR. For the EPA command, the two lowest bits of the FARG field define the number of pages to be erased (FARG[1:0]): Table 20-4. EEFC_FCR.FARG Field for EPA Command FARG[1:0] 2. Number of pages to be erased with EPA command 0 4 pages (only valid for small 8 KB sectors) 1 8 pages 2 16 pages 3 32 pages (not valid for small 8 KB sectors) When erasing is completed, the bit EEFC_FSR.FRDY rises. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the interrupt controller is activated. Three errors can be detected in EEFC_FSR after an erasing sequence: Command Error: A bad keyword has been written in EEFC_FCR. Lock Error: At least one page to be erased belongs to a locked region. The erase command has been refused, no page has been erased. A command must be run previously to unlock the corresponding region. Flash Error: At the end of the erase period, the EraseVerify test of the Flash memory has failed. 20.4.3.4 Lock Bit Protection Lock bits are associated with several pages in the embedded Flash memory plane. This defines lock regions in the embedded Flash memory plane. They prevent writing/erasing protected pages. The lock sequence is the following: 1. Execute the `Set Lock Bit' command by writing EEFC_FCR.FCMD with the SLB command and EEFC_FCR.FARG with a page number to be protected. 2. When the locking completes, the bit EEFC_FSR.FRDY rises. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the interrupt controller is activated. 3. The result of the SLB command can be checked running a `Get Lock Bit' (GLB) command. Note: The value of the FARG argument passed together with SLB command must not exceed the higher lock bit index available in the product. Two errors can be detected in EEFC_FSR after a programming sequence: Command Error: A bad keyword has been written in EEFC_FCR. Flash Error: At the end of the programming, the EraseVerify or WriteVerify test of the Flash memory has failed. It is possible to clear lock bits previously set. After the lock bits are cleared, the locked region can be erased or programmed. The unlock sequence is the following: 1. Execute the `Clear Lock Bit' command by writing EEFC_FCR.FCMD with the CLB command and EEFC_FCR.FARG with a page number to be unprotected. 2. Note: When the unlock completes, the bit EEFC_FSR.FRDY rises. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the interrupt controller is activated. The value of the FARG argument passed together with CLB command must not exceed the higher lock bit index available in the product. Two errors can be detected in EEFC_FSR after a programming sequence: 366 Command Error: A bad keyword has been written in EEFC_FCR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Flash Error: At the end of the programming, the EraseVerify or WriteVerify test of the Flash memory has failed. The status of lock bits can be returned by the EEFC. The `Get Lock Bit' sequence is the following: 1. Execute the `Get Lock Bit' command by writing EEFC_FCR.FCMD with the GLB command. Field EEFC_FCR.FARG is meaningless. 2. Lock bits can be read by the software application in EEFC_FRR. The first word read corresponds to the 32 first lock bits, next reads providing the next 32 lock bits as long as it is meaningful. Extra reads to EEFC_FRR return 0. For example, if the third bit of the first word read in EEFC_FRR is set, the third lock region is locked. Two errors can be detected in EEFC_FSR after a programming sequence: Command Error: A bad keyword has been written in EEFC_FCR. Flash Error: At the end of the programming, the EraseVerify or WriteVerify test of the Flash memory has failed. Note: 20.4.3.5 Access to the Flash in read is permitted when a `Set Lock Bit', `Clear Lock Bit' or `Get Lock Bit' command is executed. GPNVM Bit GPNVM bits do not interfere with the embedded Flash memory plane. For more details, refer to the section "Memories" of this datasheet. The `Set GPNVM Bit' sequence is the following: 1. Execute the `Set GPNVM Bit' command by writing EEFC_FCR.FCMD with the SGPB command and EEFC_FCR.FARG with the number of GPNVM bits to be set. 2. When the GPNVM bit is set, the bit EEFC_FSR.FRDY rises. If an interrupt was enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the interrupt controller is activated. 3. The result of the SGPB command can be checked by running a `Get GPNVM Bit' (GGPB) command. Note: The value of the FARG argument passed together with SGPB command must not exceed the higher GPNVM index available in the product. Flash data content is not altered if FARG exceeds the limit. Command Error is detected only if FARG is greater than 8. Two errors can be detected in EEFC_FSR after a programming sequence: Command Error: A bad keyword has been written in EEFC_FCR. Flash Error: At the end of the programming, the EraseVerify or WriteVerify test of the Flash memory has failed. It is possible to clear GPNVM bits previously set. The `Clear GPNVM Bit' sequence is the following: 1. Execute the `Clear GPNVM Bit' command by writing EEFC_FCR.FCMD with the CGPB command and EEFC_FCR.FARG with the number of GPNVM bits to be cleared. 2. Note: When the clear completes, the bit EEFC_FSR.FRDY rises. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the interrupt controller is activated. The value of the FARG argument passed together with CGPB command must not exceed the higher GPNVM index available in the product. Flash data content is not altered if FARG exceeds the limit. Command Error is detected only if FARG is greater than 8. Two errors can be detected in EEFC_FSR after a programming sequence: Command Error: A bad keyword has been written in EEFC_FCR. Flash Error: At the end of the programming, the EraseVerify or WriteVerify test of the Flash memory has failed. The status of GPNVM bits can be returned by the EEFC. The sequence is the following: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 367 1. Execute the `Get GPNVM Bit' command by writing EEFC_FCR.FCMD with the GGPB command. Field EEFC_FCR.FARG is meaningless. 2. GPNVM bits can be read by the software application in EEFC_FRR. The first word read corresponds to the 32 first GPNVM bits, following reads provide the next 32 GPNVM bits as long as it is meaningful. Extra reads to EEFC_FRR return 0. For example, if the third bit of the first word read in EEFC_FRR is set, the third GPNVM bit is active. One error can be detected in EEFC_FSR after a programming sequence: Command Error: A bad keyword has been written in EEFC_FCR. Note: 20.4.3.6 Access to the Flash in read is permitted when a `Set GPNVM Bit', `Clear GPNVM Bit' or `Get GPNVM Bit' command is executed. Calibration Bit Calibration bits do not interfere with the embedded Flash memory plane. The calibration bits cannot be modified. The status of calibration bits are returned by the EEFC. The sequence is the following: 1. Execute the `Get CALIB Bit' command by writing EEFC_FCR.FCMD with the GCALB command. Field EEFC_FCR.FARG is meaningless. 2. Calibration bits can be read by the software application in EEFC_FRR. The first word read corresponds to the first 32 calibration bits. The following reads provide the next 32 calibration bits as long as it is meaningful. Extra reads to EEFC_FRR return 0. The 4/8/12 MHz fast RC oscillator is calibrated in production. This calibration can be read through the GCALB command. The following table shows the bit implementation for each frequency. Table 20-5. Calibration Bit Indexes RC Calibration Frequency EEFC_FRR Bits 8 MHz output [28-22] 12 MHz output [38-32] The RC calibration for the 4 MHz is set to `1000000'. 20.4.3.7 Security Bit Protection When the security bit is enabled, access to the Flash through the SWD interface or through the Fast Flash Programming interface is forbidden. This ensures the confidentiality of the code programmed in the Flash. The security bit is GPNVM0. Disabling the security bit can only be achieved by asserting the ERASE pin at `1', and after a full Flash erase is performed. When the security bit is deactivated, all accesses to the Flash are permitted. 20.4.3.8 Unique Identifier Area Each device is programmed with a 128 bits unique identifier area . See Figure 20-1 "Flash Memory Areas". The sequence to read the unique identifier area is the following: 1. Execute the `Start Read Unique Identifier' command by writing EEFC_FCR.FCMD with the STUI command. Field EEFC_FCR.FARG is meaningless. 2. 368 Wait until the bit EEFC_FSR.FRDY falls to read the unique identifier area. The unique identifier field is located in the first 128 bits of the Flash memory mapping. The `Start Read Unique Identifier' command reuses some addresses of the memory plane for code, but the unique identifier area is physically different from the memory plane for code. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 3. To stop reading the unique identifier area, execute the `Stop Read Unique Identifier' command by writing EEFC_FCR.FCMD with the SPUI command. Field EEFC_FCR.FARG is meaningless. 4. When the SPUI command has been executed, the bit EEFC_FSR.FRDY rises. If an interrupt was enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the interrupt controller is activated. Note that during the sequence, the software cannot be fetched from the Flash. 20.4.3.9 User Signature Area Each product contains a user signature area of 512-bytes. It can be used for storage. Read, write and erase of this area is allowed. See Figure 20-1 "Flash Memory Areas". The sequence to read the user signature area is the following: 1. Execute the `Start Read User Signature' command by writing EEFC_FCR.FCMD with the STUS command. Field EEFC_FCR.FARG is meaningless. 2. Wait until the bit EEFC_FSR.FRDY falls to read the user signature area. The user signature area is located in the first 512 bytes of the Flash memory mapping. The `Start Read User Signature' command reuses some addresses of the memory plane but the user signature area is physically different from the memory plane 3. To stop reading the user signature area, execute the `Stop Read User Signature' command by writing EEFC_FCR.FCMD with the SPUS command. Field EEFC_FCR.FARG is meaningless. 4. When the SPUI command has been executed, the bit EEFC_FSR.FRDY rises. If an interrupt was enabled by setting the bit EEFC_FMR.FRDY, the interrupt line of the interrupt controller is activated. Note that during the sequence, the software cannot be fetched from the Flash or from the second plane in case of dual plane. One error can be detected in EEFC_FSR after this sequence: Command Error: A bad keyword has been written in EEFC_FCR. The sequence to write the user signature area is the following: 1. Write the full page, at any page address, within the internal memory area address space. 2. Execute the `Write User Signature' command by writing EEFC_FCR.FCMD with the WUS command. Field EEFC_FCR.FARG is meaningless. 3. When programming is completed, the bit EEFC_FSR.FRDY rises. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the corresponding interrupt line of the interrupt controller is activated. Two errors can be detected in EEFC_FSR after this sequence: Command Error: A bad keyword has been written in EEFC_FCR. Flash Error: At the end of the programming, the WriteVerify test of the Flash memory has failed. The sequence to erase the user signature area is the following: 1. Execute the `Erase User Signature' command by writing EEFC_FCR.FCMD with the EUS command. Field EEFC_FCR.FARG is meaningless. 2. When programming is completed, the bit EEFC_FSR.FRDY rises. If an interrupt has been enabled by setting the bit EEFC_FMR.FRDY, the corresponding interrupt line of the interrupt controller is activated. Two errors can be detected in EEFC_FSR after this sequence: Command Error: A bad keyword has been written in EEFC_FCR. Flash Error: At the end of the programming, the EraseVerify test of the Flash memory has failed. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 369 20.5 Enhanced Embedded Flash Controller (EEFC) User Interface The User Interface of the Embedded Flash Controller (EEFC) is integrated within the System Controller with base address 0x400E0A00. Table 20-6. Register Mapping Offset Register Name Access Reset State 0x00 EEFC Flash Mode Register EEFC_FMR Read/Write 0x0400_0000 0x04 EEFC Flash Command Register EEFC_FCR Write-only - 0x08 EEFC Flash Status Register EEFC_FSR Read-only 0x0000_0001 0x0C EEFC Flash Result Register EEFC_FRR Read-only 0x0 0x10-0x14 Reserved - - - 0x18-0xE4 Reserved - - - 370 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 20.5.1 EEFC Flash Mode Register Name: EEFC_FMR Address: 0x400E0A00 (0), 0x400E0C00 (1) Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - CLOE - FAM 23 22 21 20 19 18 17 16 - - - - - - - SCOD 15 14 13 12 11 10 9 8 - - - - FWS 7 6 5 4 3 2 1 0 - - - - - - - FRDY * FRDY: Flash Ready Interrupt Enable 0: Flash ready does not generate an interrupt. 1: Flash ready (to accept a new command) generates an interrupt. * FWS: Flash Wait State This field defines the number of wait states for read and write operations: FWS = Number of cycles for Read/Write operations - 1 * SCOD: Sequential Code Optimization Disable 0: The sequential code optimization is enabled. 1: The sequential code optimization is disabled. No Flash read should be done during change of this field. * FAM: Flash Access Mode 0: 128-bit access in Read mode only, to enhance access speed. 1: 64-bit access in Read mode only, to enhance power consumption. No Flash read should be done during change of this field. * CLOE: Code Loop Optimization Enable 0: The opcode loop optimization is disabled. 1: The opcode loop optimization is enabled. No Flash read should be done during change of this field. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 371 20.5.2 EEFC Flash Command Register Name: EEFC_FCR Address: 0x400E0A04 (0), 0x400E0C04 (1) Access: Write-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 FKEY 23 22 21 20 FARG 15 14 13 12 FARG 7 6 5 4 FCMD * FCMD: Flash Command Value Name Description 0x00 GETD Get Flash descriptor 0x01 WP Write page 0x02 WPL Write page and lock 0x03 EWP Erase page and write page 0x04 EWPL Erase page and write page then lock 0x05 EA Erase all 0x07 EPA Erase pages 0x08 SLB Set lock bit 0x09 CLB Clear lock bit 0x0A GLB Get lock bit 0x0B SGPB Set GPNVM bit 0x0C CGPB Clear GPNVM bit 0x0D GGPB Get GPNVM bit 0x0E STUI Start read unique identifier 0x0F SPUI Stop read unique identifier 0x10 GCALB Get CALIB bit 0x11 ES Erase sector 0x12 WUS Write user signature 0x13 EUS Erase user signature 0x14 STUS Start read user signature 0x15 SPUS Stop read user signature 372 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * FARG: Flash Command Argument GETD, GLB, GGPB, STUI, SPUI, GCALB, WUS, EUS, STUS, SPUS, EA Commands requiring no argument, including Erase all command FARG is meaningless, must be written with 0 ES Erase sector command FARG must be written with any page number within the sector to be erased FARG[1:0] defines the number of pages to be erased The start page must be written in FARG[15:2]. FARG[1:0] = 0: Four pages to be erased. FARG[15:2] = Page_Number / 4 EPA Erase pages command FARG[1:0] = 1: Eight pages to be erased. FARG[15:3] = Page_Number / 8, FARG[2]=0 FARG[1:0] = 2: Sixteen pages to be erased. FARG[15:4] = Page_Number / 16, FARG[3:2]=0 FARG[1:0] = 3: Thirty-two pages to be erased. FARG[15:5] = Page_Number / 32, FARG[4:2]=0 Refer to Table 20-4 "EEFC_FCR.FARG Field for EPA Command". WP, WPL, EWP, EWPL Programming commands FARG must be written with the page number to be programmed SLB, CLB Lock bit commands FARG defines the page number to be locked or unlocked SGPB, CGPB GPNVM commands FARG defines the GPNVM number to be programmed * FKEY: Flash Writing Protection Key Value Name 0x5A PASSWD Description The 0x5A value enables the command defined by the bits of the register. If the field is written with a different value, the write is not performed and no action is started. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 373 20.5.3 EEFC Flash Status Register Name: EEFC_FSR Address: 0x400E0A08 (0), 0x400E0C08 (1) Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - FLERR FLOCKE FCMDE FRDY * FRDY: Flash Ready Status (cleared when Flash is busy) 0: The EEFC is busy. 1: The EEFC is ready to start a new command. When set, this flag triggers an interrupt if the FRDY flag is set in EEFC_FMR. This flag is automatically cleared when the EEFC is busy. * FCMDE: Flash Command Error Status (cleared on read or by writing EEFC_FCR) 0: No invalid commands and no bad keywords were written in EEFC_FMR. 1: An invalid command and/or a bad keyword was/were written in EEFC_FMR. * FLOCKE: Flash Lock Error Status (cleared on read) 0: No programming/erase of at least one locked region has happened since the last read of EEFC_FSR. 1: Programming/erase of at least one locked region has happened since the last read of EEFC_FSR. This flag is automatically cleared when EEFC_FSR is read or EEFC_FCR is written. * FLERR: Flash Error Status (cleared when a programming operation starts) 0: No Flash memory error occurred at the end of programming (EraseVerify or WriteVerify test has passed). 1: A Flash memory error occurred at the end of programming (EraseVerify or WriteVerify test has failed). 374 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 20.5.4 EEFC Flash Result Register Name: EEFC_FRR Address: 0x400E0A0C (0), 0x400E0C0C (1) Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 FVALUE 23 22 21 20 FVALUE 15 14 13 12 FVALUE 7 6 5 4 FVALUE * FVALUE: Flash Result Value The result of a Flash command is returned in this register. If the size of the result is greater than 32 bits, the next resulting value is accessible at the next register read. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 375 21. Fast Flash Programming Interface (FFPI) 21.1 Description The Fast Flash Programming Interface (FFPI) provides parallel high-volume programming using a standard gang programmer. The parallel interface is fully handshaked and the device is considered to be a standard EEPROM. Additionally, the parallel protocol offers an optimized access to all the embedded Flash functionalities. Although the Fast Flash Programming mode is a dedicated mode for high volume programming, this mode is not designed for in-situ programming. 21.2 Embedded Characteristics 376 Programming Mode for High-volume Flash Programming Using Gang Programmer Offers Read and Write Access to the Flash Memory Plane Enables Control of Lock Bits and General-purpose NVM Bits Enables Security Bit Activation Disabled Once Security Bit is Set Parallel Fast Flash Programming Interface Provides an 16-bit Parallel Interface to Program the Embedded Flash Full Handshake Protocol SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 21.3 Parallel Fast Flash Programming 21.3.1 Device Configuration In Fast Flash Programming mode, the device is in a specific test mode. Only a certain set of pins is significant. The rest of the PIOs are used as inputs with a pull-up. The crystal oscillator is in bypass mode. Other pins must be left unconnected. Figure 21-1. 16-bit Parallel Programming Interface VDDIO VDDIO VDDIO TST PGMEN0 PGMEN1 VDDCORE NCMD RDY PGMNCMD PGMRDY NOE PGMNOE NVALID Table 21-1. Signal Name VDDIO VDDPLL GND PGMNVALID MODE[3:0] PGMM[3:0] DATA[15:0] PGMD[15:0] 0 - 50MHz XIN Signal Description List Function Type Active Level Comments Power VDDIO I/O Lines Power Supply Power - - VDDCORE Core Power Supply Power - - VDDPLL PLL Power Supply Power - - GND Ground Ground - - Input - 32 KHz to 50 MHz Clocks Main Clock Input. XIN This input can be tied to GND. In this case, the device is clocked by the internal RC oscillator. Test TST Test Mode Select Input High Must be connected to VDDIO PGMEN0 Test Mode Select Input High Must be connected to VDDIO PGMEN1 Test Mode Select Input High Must be connected to VDDIO PGMEN2 Test Mode Select Input Low Must be connected to GND Input Low Pulled-up input at reset PIO PGMNCMD Valid command available SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 377 Table 21-1. Signal Description List (Continued) Signal Name Type Active Level Output High Pulled-up input at reset Input Low Pulled-up input at reset Output Low Pulled-up input at reset Input - Pulled-up input at reset Input/Output - Pulled-up input at reset Function 0: Device is busy PGMRDY 1: Device is ready for a new command PGMNOE Output Enable (active high) 0: DATA[15:0] is in input mode PGMNVALID 1: DATA[15:0] is in output mode PGMM[3:0] Specifies DATA type (see Table 21-2) PGMD[15:0] Bi-directional data bus Comments 21.3.2 Signal Names Depending on the MODE settings, DATA is latched in different internal registers. Table 21-2. Mode Coding MODE[3:0] Symbol Data 0000 CMDE Command Register 0001 ADDR0 Address Register LSBs 0010 ADDR1 - 0011 ADDR2 - 0100 ADDR3 Address Register MSBs 0101 DATA Data Register Default IDLE No register When MODE is equal to CMDE, then a new command (strobed on DATA[15:0] signals) is stored in the command register. Table 21-3. 378 Command Bit Coding DATA[15:0] Symbol Command Executed 0x0011 READ Read Flash 0x0012 WP Write Page Flash 0x0022 WPL Write Page and Lock Flash 0x0032 EWP Erase Page and Write Page 0x0042 EWPL Erase Page and Write Page then Lock 0x0013 EA Erase All 0x0014 SLB Set Lock Bit 0x0024 CLB Clear Lock Bit 0x0015 GLB Get Lock Bit 0x0034 SGPB Set General Purpose NVM bit 0x0044 CGPB Clear General Purpose NVM bit 0x0025 GGPB Get General Purpose NVM bit 0x0054 SSE Set Security Bit SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 21-3. Command Bit Coding (Continued) DATA[15:0] Symbol Command Executed 0x0035 GSE Get Security Bit 0x001F WRAM Write Memory 0x001E GVE Get Version 21.3.3 Entering Programming Mode The following algorithm puts the device in Parallel Programming mode: 1. Apply the supplies as described in Table 21-1. 2. Apply XIN clock within tPOR_RESET if an external clock is available. 3. Wait for tPOR_RESET 4. Start a read or write handshaking. Note: After reset, the device is clocked by the internal RC oscillator. Before clearing RDY signal, if an external clock ( > 32 kHz) is connected to XIN, then the device switches on the external clock. Else, XIN input is not considered. A higher frequency on XIN speeds up the programmer handshake. 21.3.4 Programmer Handshaking An handshake is defined for read and write operations. When the device is ready to start a new operation (RDY signal set), the programmer starts the handshake by clearing the NCMD signal. The handshaking is achieved once NCMD signal is high and RDY is high. 21.3.4.1 Write Handshaking For details on the write handshaking sequence, refer to Figure 21-2 and Table 21-4. Figure 21-2. Parallel Programming Timing, Write Sequence NCMD 2 4 3 RDY 5 NOE NVALID DATA[15:0] 1 MODE[3:0] Table 21-4. Write Handshake Step Programmer Action Device Action Data I/O 1 Sets MODE and DATA signals Waits for NCMD low Input 2 Clears NCMD signal Latches MODE and DATA Input 3 Waits for RDY low Clears RDY signal Input SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 379 Table 21-4. Write Handshake (Continued) Step Programmer Action Device Action Data I/O 4 Releases MODE and DATA signals Executes command and polls NCMD high Input 5 Sets NCMD signal Executes command and polls NCMD high Input 6 Waits for RDY high Sets RDY Input 21.3.4.2 Read Handshaking For details on the read handshaking sequence, refer to Figure 21-3 and Table 21-5. Figure 21-3. Parallel Programming Timing, Read Sequence NCMD 12 2 3 RDY 13 NOE 9 5 NVALID 11 7 6 4 Adress IN DATA[15:0] Z 8 Data OUT 10 X IN 1 MODE[3:0] Table 21-5. ADDR Read Handshake Step Programmer Action Device Action DATA I/O 1 Sets MODE and DATA signals Waits for NCMD low Input 2 Clears NCMD signal Latch MODE and DATA Input 3 Waits for RDY low Clears RDY signal Input 4 Sets DATA signal in tristate Waits for NOE Low Input 5 Clears NOE signal - Tristate 6 Waits for NVALID low Sets DATA bus in output mode and outputs the flash contents. Output 7 - Clears NVALID signal Output 8 Reads value on DATA Bus Waits for NOE high Output 9 Sets NOE signal 10 Waits for NVALID high Sets DATA bus in input mode X 11 Sets DATA in output mode Sets NVALID signal Input 12 Sets NCMD signal Waits for NCMD high Input 13 Waits for RDY high Sets RDY signal Input 380 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Output 21.3.5 Device Operations Several commands on the Flash memory are available. These commands are summarized in Table 21-3. Each command is driven by the programmer through the parallel interface running several read/write handshaking sequences. When a new command is executed, the previous one is automatically achieved. Thus, chaining a read command after a write automatically flushes the load buffer in the Flash. 21.3.5.1 Flash Read Command This command is used to read the contents of the Flash memory. The read command can start at any valid address in the memory plane and is optimized for consecutive reads. Read handshaking can be chained; an internal address buffer is automatically increased. Table 21-6. Read Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE READ 2 Write handshaking ADDR0 Memory Address LSB 3 Write handshaking ADDR1 Memory Address 4 Read handshaking DATA *Memory Address++ 5 Read handshaking DATA *Memory Address++ ... ... ... ... n Write handshaking ADDR0 Memory Address LSB n+1 Write handshaking ADDR1 Memory Address n+2 Read handshaking DATA *Memory Address++ n+3 Read handshaking DATA *Memory Address++ ... ... ... ... 21.3.5.2 Flash Write Command This command is used to write the Flash contents. The Flash memory plane is organized into several pages. Data to be written are stored in a load buffer that corresponds to a Flash memory page. The load buffer is automatically flushed to the Flash: before access to any page other than the current one when a new command is validated (MODE = CMDE) The Write Page command (WP) is optimized for consecutive writes. Write handshaking can be chained; an internal address buffer is automatically increased. Table 21-7. Write Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE WP or WPL or EWP or EWPL 2 Write handshaking ADDR0 Memory Address LSB 3 Write handshaking ADDR1 Memory Address 4 Write handshaking DATA *Memory Address++ 5 Write handshaking DATA *Memory Address++ ... ... ... ... n Write handshaking ADDR0 Memory Address LSB SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 381 Table 21-7. Write Command (Continued) Step Handshake Sequence MODE[3:0] DATA[15:0] n+1 Write handshaking ADDR1 Memory Address n+2 Write handshaking DATA *Memory Address++ n+3 Write handshaking DATA *Memory Address++ ... ... ... ... The Flash command Write Page and Lock (WPL) is equivalent to the Flash Write Command. However, the lock bit is automatically set at the end of the Flash write operation. As a lock region is composed of several pages, the programmer writes to the first pages of the lock region using Flash write commands and writes to the last page of the lock region using a Flash write and lock command. The Flash command Erase Page and Write (EWP) is equivalent to the Flash Write Command. However, before programming the load buffer, the page is erased. The Flash command Erase Page and Write the Lock (EWPL) combines EWP and WPL commands. 21.3.5.3 Flash Full Erase Command This command is used to erase the Flash memory planes. All lock regions must be unlocked before the Full Erase command by using the CLB command. Otherwise, the erase command is aborted and no page is erased. Table 21-8. Full Erase Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE EA 2 Write handshaking DATA 0 21.3.5.4 Flash Lock Commands Lock bits can be set using WPL or EWPL commands. They can also be set by using the Set Lock command (SLB). With this command, several lock bits can be activated. A Bit Mask is provided as argument to the command. When bit 0 of the bit mask is set, then the first lock bit is activated. In the same way, the Clear Lock command (CLB) is used to clear lock bits. Table 21-9. Set and Clear Lock Bit Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE SLB or CLB 2 Write handshaking DATA Bit Mask Lock bits can be read using Get Lock Bit command (GLB). The nth lock bit is active when the bit n of the bit mask is set. Table 21-10. Get Lock Bit Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE GLB Lock Bit Mask Status 2 Read handshaking DATA 0 = Lock bit is cleared 1 = Lock bit is set 382 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 21.3.5.5 Flash General-purpose NVM Commands General-purpose NVM bits (GP NVM bits) can be set using the Set GPNVM command (SGPB). This command also activates GP NVM bits. A bit mask is provided as argument to the command. When bit 0 of the bit mask is set, then the first GP NVM bit is activated. In the same way, the Clear GPNVM command (CGPB) is used to clear general-purpose NVM bits. The generalpurpose NVM bit is deactivated when the corresponding bit in the pattern value is set to 1. Table 21-11. Set/Clear GP NVM Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE SGPB or CGPB 2 Write handshaking DATA GP NVM bit pattern value General-purpose NVM bits can be read using the Get GPNVM Bit command (GGPB). The nth GP NVM bit is active when bit n of the bit mask is set. Table 21-12. Get GP NVM Bit Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE GGPB GP NVM Bit Mask Status 2 Read handshaking DATA 0 = GP NVM bit is cleared 1 = GP NVM bit is set 21.3.5.6 Flash Security Bit Command A security bit can be set using the Set Security Bit command (SSE). Once the security bit is active, the Fast Flash programming is disabled. No other command can be run. An event on the Erase pin can erase the security bit once the contents of the Flash have been erased. Table 21-13. Set Security Bit Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE SSE 2 Write handshaking DATA 0 Once the security bit is set, it is not possible to access FFPI. The only way to erase the security bit is to erase the Flash. In order to erase the Flash, the user must perform the following: 1. Power-off the chip. 2. Power-on the chip with TST = 0. 3. Assert Erase during a period of more than 220 ms. 4. Power-off the chip. Then it is possible to return to FFPI mode and check that Flash is erased. 21.3.5.7 Memory Write Command This command is used to perform a write access to any memory location. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 383 The Memory Write command (WRAM) is optimized for consecutive writes. Write handshaking can be chained; an internal address buffer is automatically increased. Table 21-14. Write Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE WRAM 2 Write handshaking ADDR0 Memory Address LSB 3 Write handshaking ADDR1 Memory Address 4 Write handshaking DATA *Memory Address++ 5 Write handshaking DATA *Memory Address++ ... ... ... ... n Write handshaking ADDR0 Memory Address LSB n+1 Write handshaking ADDR1 Memory Address n+2 Write handshaking DATA *Memory Address++ n+3 Write handshaking DATA *Memory Address++ ... ... ... ... 21.3.5.8 Get Version Command The Get Version (GVE) command retrieves the version of the FFPI interface. Table 21-15. 384 Get Version Command Step Handshake Sequence MODE[3:0] DATA[15:0] 1 Write handshaking CMDE GVE 2 Read handshaking DATA Version SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 22. Cortex-M Cache Controller (CMCC) 22.1 Description The Cortex-M Cache Controller (CMCC) is a 4-Way set associative unified cache controller. It integrates a controller, a tag directory, data memory, metadata memory and a configuration interface. 22.2 Embedded Characteristics Physically addressed and physically tagged L1 data cache set to 2 Kbytes L1 cache line size set to 16 Bytes L1 cache integrates 32-bit bus master interface Unified direct mapped cache architecture Unified 4-Way set associative cache architecture Write through cache operations, read allocate Round Robin victim selection policy Event Monitoring, with one programmable 32-bit counter Configuration registers accessible through Cortex-M Private Peripheral Bus (PPB) Cache interface includes cache maintenance operations registers SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 385 22.3 Block Diagram Figure 22-1. Block Diagram Cortex-M Memory Interface Bus Cortex-M Interface Cache Controller META INFO RAM RAM Interface Cortex-M PPB Registers Interface DATA RAM TAG RAM Memory Interface System Memory Bus 22.4 Functional Description 22.4.1 Cache Operation On reset, the cache controller data entries are all invalidated and the cache is disabled. The cache is transparent to processor operations. The cache controller is activated with its configuration registers. The configuration interface is memory-mapped in the private peripheral bus. Use the following sequence to enable the cache controller: 1. Verify that the cache controller is disabled by reading the value of the CSTS (Cache Controller Status) bit of the Status register (CMCC_SR). 2. Enable the cache controller by writing a one to the CEN (Cache Enable) bit of the Control register (CMCC_CTRL). 22.4.2 Cache Maintenance If the contents seen by the cache have changed, the user must invalidate the cache entries. This can be done lineby-line or for all cache entries. 386 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 22.4.2.1 Cache Invalidate-by-Line Operation When an invalidate-by-line command is issued, the cache controller resets the valid bit information of the decoded cache line. As the line is no longer valid, the replacement counter points to that line. Use the following sequence to invalidate one line of cache: 1. Disable the cache controller by clearing the CEN bit of CMCC_CTRL. 2. Check the CSTS bit of CMCC_SR to verify that the cache is successfully disabled. 3. Perform an invalidate-by-line by configuring the bits INDEX and WAY in the Maintenance Register 1 (CMCC_MAINT1). 4. Enable the cache controller by writing a one the CEN bit of the CMCC_CTRL. 22.4.2.2 Cache Invalidate All Operation To invalidate all cache entries, write a one to the INVALL bit of the Maintenance Register 0 (CMCC_MAINT0). 22.4.3 Cache Performance Monitoring The Cortex-M cache controller includes a programmable 32-bit monitor counter. The monitor can be configured to count the number of clock cycles, the number of data hits or the number of instruction hits. Use the following sequence to activate the counter: 1. Configure the monitor counter by writing to the MODE field of the Monitor Configuration register (CMCC_MCFG). 2. Enable the counter by writing a one to the MENABLE bit of the Monitor Enable register (CMCC_MEN). 3. If required, clear the counter by writing a one to the SWRST bit of the Monitor Control register (CMCC_MCTRL). 4. Check the value of the monitor counter by reading the EVENT_CNT field of the CMCC_MSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 387 22.5 Cortex-M Cache Controller (CMCC) User Interface Table 22-1. Register Mapping Offset Register Name Access Reset 0x00 Cache Controller Type Register CMCC_TYPE Read-only - 0x04 Cache Controller Configuration Register CMCC_CFG Read/Write 0x00000000 0x08 Cache Controller Control Register CMCC_CTRL Write-only - 0x0C Cache Controller Status Register CMCC_SR Read-only 0x00000001 0x10-0x1C Reserved - - - 0x20 Cache Controller Maintenance Register 0 CMCC_MAINT0 Write-only - 0x24 Cache Controller Maintenance Register 1 CMCC_MAINT1 Write-only - 0x28 Cache Controller Monitor Configuration Register CMCC_MCFG Read/Write 0x00000000 0x2C Cache Controller Monitor Enable Register CMCC_MEN Read/Write 0x00000000 0x30 Cache Controller Monitor Control Register CMCC_MCTRL Write-only - 0x34 Cache Controller Monitor Status Register CMCC_MSR Read-only 0x00000000 0x38-0xFC Reserved - - - 388 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 22.5.1 Cache Controller Type Register Name: CMCC_TYPE Address: 0x4007C000 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 13 12 CLSIZE 11 10 9 CSIZE 8 7 LCKDOWN 6 5 4 RRP 3 LRUP 2 RANDP 1 GCLK 0 AP WAYNUM * AP: Access Port Access Allowed 0: Access Port Access is disabled. 1: Access Port Access is enabled. * GCLK: Dynamic Clock Gating Supported 0: Cache controller does not support clock gating. 1: Cache controller uses dynamic clock gating. * RANDP: Random Selection Policy Supported 0: Random victim selection is not supported. 1: Random victim selection is supported. * LRUP: Least Recently Used Policy Supported 0: Least Recently Used Policy is not supported. 1: Least Recently Used Policy is supported. * RRP: Random Selection Policy Supported 0: Random Selection Policy is not supported. 1: Random Selection Policy is supported. * WAYNUM: Number of Ways Value Name Description 0 DMAPPED Direct Mapped Cache 1 ARCH2WAY 2-way set associative 2 ARCH4WAY 4-way set associative 3 ARCH8WAY 8-way set associative SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 389 * LCKDOWN: Lockdown Supported 0: Lockdown is not supported. 1: Lockdown is supported. * CSIZE: Data Cache Size Value Name Description 0 CSIZE_1KB Data cache size is 1 Kbyte 1 CSIZE_2KB Data cache size is 2 Kbytes 2 CSIZE_4KB Data cache size is 4 Kbytes 3 CSIZE_8KB Data cache size is 8 Kbytes * CLSIZE: Cache LIne Size Value Name 0 CLSIZE_1KB Cache line size is 4 bytes 1 CLSIZE_2KB Cache line size is 8 bytes 2 CLSIZE_4KB Cache line size is 16 bytes 3 CLSIZE_8KB Cache line size is 32 bytes 390 Description SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 22.5.2 Cache Controller Configuration Register Name: CMCC_CFG Address: 0x4007C004 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 GCLKDIS * GCLKDIS: Disable Clock Gating 0: Clock gating is activated. 1: Clock gating is disabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 391 22.5.3 Cache Controller Control Register Name: CMCC_CTRL Address: 0x4007C008 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 CEN * CEN: Cache Controller Enable 0: The cache controller is disabled. 1: The cache controller is enabled. 392 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 22.5.4 Cache Controller Status Register Name: CMCC_SR Address: 0x4007C00C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 CSTS * CSTS: Cache Controller Status 0: The cache controller is disabled. 1: The cache controller is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 393 22.5.5 Cache Controller Maintenance Register 0 Name: CMCC_MAINT0 Address: 0x4007C020 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 INVALL * INVALL: Cache Controller Invalidate All 0: No effect. 1: All cache entries are invalidated. 394 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 22.5.6 Cache Controller Maintenance Register 1 Name: CMCC_MAINT1 Address: 0x4007C024 Access: Write-only 31 30 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 INDEX 7 6 5 4 3 - 2 - 1 - 0 - WAY INDEX * INDEX: Invalidate Index This field indicates the cache line that is being invalidated. The size of the INDEX field depends on the cache size: For example: - for 2 Kbytes: 5 bits - for 4 Kbytes: 6 bits - for 8 Kbytes: 7 bits * WAY: Invalidate Way Value Name Description 0 WAY0 Way 0 is selection for index invalidation 1 WAY1 Way 1 is selection for index invalidation 2 WAY2 Way 2 is selection for index invalidation 3 WAY3 Way 3 is selection for index invalidation SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 395 22.5.7 Cache Controller Monitor Configuration Register Name: CMCC_MCFG Address: 0x4007C028 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 * MODE: Cache Controller Monitor Counter Mode Value Name 0 CYCLE_COUNT 1 IHIT_COUNT Instruction hit counter 2 DHIT_COUNT Data hit counter 396 Description Cycle counter SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 0 MODE 22.5.8 Cache Controller Monitor Enable Register Name: CMCC_MEN Address: 0x4007C02C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 MENABLE * MENABLE: Cache Controller Monitor Enable 0: The monitor counter is disabled. 1: The monitor counter is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 397 22.5.9 Cache Controller Monitor Control Register Name: CMCC_MCTRL Address: 0x4007C030 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 SWRST * SWRST: Monitor 0: No effect. 1: Resets the event counter register. 398 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 22.5.10 Cache Controller Monitor Status Register Name: CMCC_MSR Address: 0x4007C034 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 EVENT_CNT 23 22 21 20 EVENT_CNT 15 14 13 12 EVENT_CNT 7 6 5 4 EVENT_CNT * EVENT_CNT: Monitor Event Counter SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 399 23. Cyclic Redundancy Check Calculation Unit (CRCCU) 23.1 Description The Cyclic Redundancy Check Calculation Unit (CRCCU) has its own DMA which functions as a Master with the Bus Matrix. Three different polynomials are available: CCITT802.3, CASTAGNOLI and CCITT16. The CRCCU is designed to perform data integrity checks of off-/on-chip memories as a background task without CPU intervention. 23.2 Embedded Characteristics Data Integrity Check of Off-/On-Chip Memories Background Task Without CPU Intervention Performs Cyclic Redundancy Check (CRC) Operation on Programmable Memory Area Programmable Bus Burden Note: 400 The CRCCU is designed to verify data integrity of off-/on-chip memories, thus the CRC must be generated and verified by the CRCCU. The CRCCU performs the CRC from LSB to MSB. If the CRC has been performed with the same polynomial by another device, a bit-reverse must be done on each byte before using the CRCCU. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 23.3 CRCCU Block Diagram Figure 23-1. Block Diagram Host Interface APB Bus Context FSM TR_CRC TR_ADDR HRDATA AHB Interface HTRANS HSIZE AHB-Layer External Bus Interface Flash AHB SRAM SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 401 23.4 Product Dependencies 23.4.1 Power Management The CRCCU is clocked through the Power Management Controller (PMC), the programmer must first configure the CRCCU in the PMC to enable the CRCCU clock. 23.4.2 Interrupt Source The CRCCU has an interrupt line connected to the Interrupt Controller. Handling the CRCCU interrupt requires programming the Interrupt Controller before configuring the CRCCU. 402 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 23.5 CRCCU Functional Description 23.5.1 CRC Calculation Unit The CRCCU integrates a dedicated Cyclic Redundancy Check (CRC) engine. When configured and activated, this CRC engine performs a checksum computation on a memory area. CRC computation is performed from the LSB to MSB. Three different polynomials are available: CCITT802.3, CASTAGNOLI and CCITT16 (see field description "PTYPE: Primitive Polynomial" in Section 23.7.10 "CRCCU Mode Register" for details). 23.5.2 CRC Calculation Unit Operation The CRCCU has a DMA controller that supports programmable CRC memory checks. When enabled, the DMA channel reads a programmable amount of data and computes CRC on the fly. The CRCCU is controlled by two registers, TR_ADDR and TR_CTRL, which need to be mapped in the internal SRAM. The addresses of these two registers are pointed to by the CRCCU_DSCR. Table 23-1. CRCCU Descriptor Memory Mapping SRAM Memory CRCCU_DSCR+0x0 ----> TR_ADDR CRCCU_DSCR+0x4 ----> TR_CTRL CRCCU_DSCR+0x8 ----> Reserved CRCCU_DSCR+0xC ----> Reserved CRCCU_DSCR+0x10 ----> TR_CRC TR_ADDR defines the start address of memory area targeted for CRC calculation. TR_CTRL defines the buffer transfer size, the transfer width (byte, halfword, word) and the transfer-completed interrupt enable. To start the CRCCU, set the CRC enable bit (ENABLE) and configure the mode of operation in the CRCCU Mode Register (CRCCU_MR), then configure the Transfer Control Registers and finally, set the DMA enable bit (DMAEN) in the CRCCU DMA Enable Register (CRCCU_DMA_EN). When the CRCCU is enabled, the CRCCU reads the predefined amount of data (defined in TR_CTRL) located from TR_ADDR start address and computes the checksum. The CRCCU_SR contains the temporary CRC value. The BTSIZE field located in the TR_CTRL register (located in memory), is automatically decremented if its value is different from zero. Once the value of the BTSIZE field is equal to zero, the CRCCU is disabled by hardware. In this case, the relevant CRCCU DMA Status Register bit DMASR is automatically cleared. If the COMPARE field of the CRCCU_MR is set to true, the TR_CRC (Transfer Reference Register) is compared with the last CRC computed. If a mismatch occurs, an error flag is set and an interrupt is raised (if unmasked). The CRCCU accesses the memory by single access (TRWIDTH size) in order not to limit the bandwidth usage of the system, but the DIVIDER field of the CRCCU Mode Register can be used to lower it by dividing the frequency of the single accesses. The CRCCU scrolls the defined memory area using ascending addresses. In order to compute the CRC for a memory size larger than 256 Kbytes or for non-contiguous memory area, it is possible to re-enable the CRCCU on the new memory area and the CRC will be updated accordingly. Use the RESET field of the CRCCU_CR to reset the CRCCU Status Register to its default value (0xFFFFFFFF). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 403 23.6 Transfer Control Registers Memory Mapping Table 23-2. Transfer Control Register Memory Mapping Offset Register Name Access Reset CRCCU_DSCR + 0x0 CRCCU Transfer Address Register TR_ADDR Read/Write 0x00000000 CRCCU_DSCR + 0x4 CRCCU Transfer Control Register TR_CTRL Read/Write 0x00000000 CRCCU_DSCR + 0xC-0x10 Reserved - - - CRCCU_DSCR+0x10 CRCCU Transfer Reference Register TR_CRC Read/Write 0x00000000 Note: These registers are memory mapped. 404 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 23.6.1 Transfer Address Register Name: TR_ADDR Access: Read/Write 31 30 29 28 23 22 21 20 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ADDR ADDR 15 14 13 12 7 6 5 4 ADDR ADDR * ADDR: Transfer Address SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 405 23.6.2 Transfer Control Register Name: TR_CTRL Access: Read/Write 31 - 23 - 15 30 - 22 - 14 29 - 21 - 13 28 - 20 - 12 7 6 5 4 27 IEN 19 - 11 26 - 18 - 10 25 24 17 - 9 16 - 8 3 2 1 0 TRWIDTH BTSIZE BTSIZE * BTSIZE: Buffer Transfer Size * TRWIDTH: Transfer Width Register Value Name Description 0 BYTE The data size is 8-bit 1 HALFWORD The data size is 16-bit 2 WORD The data size is 32-bit * IEN: Context Done Interrupt Enable (Active Low) 0: Bit DMAISR of CRCCU_DMA_ISR is set at the end of the current descriptor transfer. 1: Bit DMAISR of CRCCU_DMA_ISR remains cleared. 406 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 23.6.3 Transfer Reference Register Name: TR_CRC Access: Read/Write 31 30 29 28 23 22 21 20 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 REFCRC REFCRC 15 14 13 12 7 6 5 4 REFCRC REFCRC * REFCRC: Reference CRC When Compare mode is enabled, the checksum is compared with this field. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 407 23.7 Cyclic Redundancy Check Calculation Unit (CRCCU) User Interface Table 23-3. Register Mapping Offset Register 0x000 CRCCU Descriptor Base Register 0x004 Reserved 0x008 CRCCU DMA Enable Register CRCCU_DMA_EN Write-only - 0x00C CRCCU DMA Disable Register CRCCU_DMA_DIS Write-only - 0x010 CRCCU DMA Status Register CRCCU_DMA_SR Read-only 0x014 CRCCU DMA Interrupt Enable Register CRCCU_DMA_IER Write-only - 0x018 CRCCU DMA Interrupt Disable Register CRCCU_DMA_IDR Write-only - 0x001C CRCCU DMA Interrupt Mask Register CRCCU_DMA_IMR Read-only 0x00000000 0x020 CRCCU DMA Interrupt Status Register CRCCU_DMA_ISR Read-only 0x00000000 - - 0x024-0x030 Reserved Name CRCCU_DSCR - Access Read/Write 0x00000000 - - Reset - 0x00000000 0x034 CRCCU Control Register CRCCU_CR Write-only - 0x038 CRCCU Mode Register CRCCU_MR Read/Write 0x00000000 0x03C CRCCU Status Register CRCCU_SR Read-only 0xFFFFFFFF 0x040 CRCCU Interrupt Enable Register CRCCU_IER Write-only - 0x044 CRCCU Interrupt Disable Register CRCCU_IDR Write-only - 0x048 CRCCU Interrupt Mask Register CRCCU_IMR Read-only 0x00000000 0x004C CRCCU Interrupt Status Register CRCCU_ISR Read-only 0x00000000 - - 0x050-0x0FC Reserved 408 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 - 23.7.1 CRCCU Descriptor Base Address Register Name: CRCCU_DSCR Address: 0x40044000 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 3 - 2 - 1 - 8 - 0 - DSCR 23 22 21 20 DSCR 15 14 13 7 - 6 - 5 - 12 DSCR 4 - * DSCR: Descriptor Base Address DSCR needs to be aligned with 512-byte boundaries. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 409 23.7.2 CRCCU DMA Enable Register Name: CRCCU_DMA_EN Address: 0x40044008 Access: Write-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - * DMAEN: DMA Enable 0: No effect 1: Enable CRCCU DMA channel 410 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 DMAEN 23.7.3 CRCCU DMA Disable Register Name: CRCCU_DMA_DIS Address: 0x4004400C Access: Write-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 DMADIS * DMADIS: DMA Disable 0: No effect 1: Disable CRCCU DMA channel SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 411 23.7.4 CRCCU DMA Status Register Name: CRCCU_DMA_SR Address: 0x40044010 Access: Read-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - * DMASR: DMA Status 0: DMA channel disabled 1: DMA channel enabled 412 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 DMASR 23.7.5 CRCCU DMA Interrupt Enable Register Name: CRCCU_DMA_IER Address: 0x40044014 Access: Write-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 DMAIER * DMAIER: Interrupt Enable 0: No effect 1: Enable interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 413 23.7.6 CRCCU DMA Interrupt Disable Register Name: CRCCU_DMA_IDR Address: 0x40044018 Access: Write-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - * DMAIDR: Interrupt Disable 0: No effect 1: Disable interrupt 414 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 DMAIDR 23.7.7 CRCCU DMA Interrupt Mask Register Name: CRCCU_DMA_IMR Address: 0x4004401C Access: Read-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 DMAIMR * DMAIMR: Interrupt Mask 0: Buffer Transfer Completed interrupt disabled 1: Buffer Transfer Completed interrupt enabled SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 415 23.7.8 CRCCU DMA Interrupt Status Register Name: CRCCU_DMA_ISR Address: 0x40044020 Access: Read-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - * DMAISR: Interrupt Status 0: DMA buffer transfer has not yet started or transfer still in progress 1: DMA buffer transfer has terminated. This flag is reset after read. 416 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 DMAISR 23.7.9 CRCCU Control Register Name: CRCCU_CR Address: 0x40044034 Access: Write-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 RESET * RESET: CRC Computation Reset 0: No effect 1: Sets the CRCCU_SR to 0xFFFFFFFF SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 417 23.7.10 CRCCU Mode Register Name: CRCCU_MR Address: 0x40044038 Access: Read/Write 31 - 23 - 15 - 7 30 - 22 - 14 - 6 29 - 21 - 13 - 5 DIVIDER 28 - 20 - 12 - 4 27 - 19 - 11 - 3 26 - 18 - 10 - 2 PTYPE 25 - 17 - 9 - 1 COMPARE 24 - 16 - 8 - 0 ENABLE * ENABLE: CRC Enable Always write a 1 to this bit. * COMPARE: CRC Compare If set to one, this bit indicates that the CRCCU DMA will compare the CRC computed on the data stream with the value stored in the TR_CRC reference register. If a mismatch occurs, the ERRISR bit in the CRCCU_ISR is set. * PTYPE: Primitive Polynomial Value Name Description 0 CCITT8023 Polynom 0x04C11DB7 1 CASTAGNOLI Polynom 0x1EDC6F41 2 CCITT16 Polynom 0x1021 * DIVIDER: Request Divider CRCCU DMA performs successive transfers. It is possible to reduce the bandwidth drained by the CRCCU DMA by programming the DIVIDER field. The transfer request frequency is divided by 2^(DIVIDER+1). 418 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 23.7.11 CRCCU Status Register Name: CRCCU_SR Address: 0x4004403C Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 CRC 23 22 21 20 CRC 15 14 13 12 CRC 7 6 5 4 CRC * CRC: Cyclic Redundancy Check Value This register can not be read if the COMPARE bit in the CRCCU_MR is set to true. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 419 23.7.12 CRCCU Interrupt Enable Register Name: CRCCU_IER Address: 0x40044040 Access: Write-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - * ERRIER: CRC Error Interrupt Enable 0: No effect 1: Enable interrupt 420 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 ERRIER 23.7.13 CRCCU Interrupt Disable Register Name: CRCCU_IDR Address: 0x40044044 Access: Write-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 ERRIDR * ERRIDR: CRC Error Interrupt Disable 0: No effect 1: Disable interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 421 23.7.14 CRCCU Interrupt Mask Register Name: CRCCU_IMR Address: 0x40044048 Access: Read-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - * ERRIMR: CRC Error Interrupt Mask 0: Interrupt disabled 1: Interrupt enabled 422 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 ERRIMR 23.7.15 CRCCU Interrupt Status Register Name: CRCCU_ISR Address: 0x4004404C Access: Read-only 31 - 23 - 15 - 7 - 30 - 22 - 14 - 6 - 29 - 21 - 13 - 5 - 28 - 20 - 12 - 4 - 27 - 19 - 11 - 3 - 26 - 18 - 10 - 2 - 25 - 17 - 9 - 1 - 24 - 16 - 8 - 0 ERRISR * ERRISR: CRC Error Interrupt Status 0: Interrupt disabled 1: Interrupt enabled SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 423 24. Boot Program 24.1 Description The SAM-BA Boot Program integrates an array of programs permitting download and/or upload into the different memories of the product. 24.2 Hardware and Software Constraints SAM-BA Boot uses the first 2048 bytes of the SRAM for variables and stacks. The remaining available size can be used for user's code. USB Requirements: External Crystal or External Clock(1) with frequency of: 11.289 MHz 12.000 MHz 16.000 MHz Note: 18.432 MHz UART0 requirements: None 1. Table 24-1. 24.3 Must be 2500 ppm and 1.2V Square Wave Signal. Pins Driven during Boot Program Execution Peripheral Pin PIO Line UART0 URXD0 PA9 UART0 UTXD0 PA10 Flow Diagram The Boot Program implements the algorithm in Figure 24-1. Figure 24-1. Boot Program Algorithm Flow Diagram No Device Setup No USB Enumeration Successful ? Yes Run SAM-BA Monitor Character # received from UART0? Yes Run SAM-BA Monitor The SAM-BA Boot program seeks to detect a source clock either from the embedded main oscillator with external crystal (main oscillator enabled) or from a supported frequency signal applied to the XIN pin (main oscillator in Bypass mode). If a clock is found from the two possible sources above, the boot program checks to verify that the frequency is one of the supported external frequencies. If the frequency is one of the supported external frequencies, USB activation is allowed, else (no clock or frequency other than one of the supported external frequencies), the internal 12 MHz RC oscillator is used as main clock and USB clock is not allowed due to frequency drift of the 12 MHz RC oscillator. 424 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 24.4 Device Initialization Initialization follows the steps described below: 1. Stack setup 2. Set up the Embedded Flash Controller 3. External Clock detection (crystal or external clock on XIN) 4. If external crystal or clock with supported frequency, allow USB activation 5. Else, does not allow USB activation and use internal 12 MHz RC oscillator 6. Main oscillator frequency detection if no external clock detected 7. Switch Master Clock on Main Oscillator 8. C variable initialization 9. PLLA setup: PLLA is initialized to generate a 48 MHz clock 10. Disable the Watchdog 11. Initialization of UART0 (115200 bauds, 8, N, 1) 12. Initialization of the USB Device Port (in case USB activation allowed) 13. Wait for one of the following events 1. Check if USB device enumeration has occurred 2. Check if characters have been received in UART0 14. Jump to SAM-BA Monitor (see Section 24.5 "SAM-BA Monitor") SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 425 24.5 SAM-BA Monitor Once the communication interface is identified, to run in an infinite loop waiting for different commands as shown in Table 24-2. Table 24-2. Commands Available through the SAM-BA Boot Command Argument(s) Example N Set Normal Mode No argument N# T Set Terminal Mode No argument T# O Write a Byte Address, Value# O200001,CA# o Read a Byte Address,# o200001,# H Write a Half Word Address, Value# H200002,CAFE# h Read a Half Word Address,# h200002,# W Write a Word Address, Value# W200000,CAFEDECA# w Read a Word Address,# w200000,# S Send a File Address,# S200000,# R Receive a File Address, NbOfBytes# R200000,1234# G Go Address# G200200# V Display Version No argument V# Mode commands: Normal mode configures SAM-BA Monitor to send/receive data in binary format, Terminal mode configures SAM-BA Monitor to send/receive data in ascii format. Write commands: Write a byte (O), a halfword (H) or a word (W) to the target. Address: Address in hexadecimal Output: The byte, halfword or word read in hexadecimal following by `>' Send a file (S): Send a file to a specified address Address: Address in hexadecimal Output: `>'. There is a time-out on this command which is reached when the prompt `>' appears before the end of the command execution. Receive a file (R): Receive data into a file from a specified address Value: Byte, halfword or word to write in hexadecimal. Output: `>'. Address: Address in hexadecimal. Read commands: Read a byte (o), a halfword (h) or a word (w) from the target. Note: Address: Address in hexadecimal NbOfBytes: Number of bytes in hexadecimal to receive Output: `>' Go (G): Jump to a specified address and execute the code Address: Address to jump in hexadecimal Output: `>' Get Version (V): Return the SAM-BA boot version 426 Action Output: `>' SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 24.5.1 UART0 Serial Port Communication is performed through the UART0 initialized to 115200 Baud, 8, n, 1. The Send and Receive File commands use the Xmodem protocol to communicate. Any terminal performing this protocol can be used to send the application file to the target. The size of the binary file to send depends on the SRAM size embedded in the product. In all cases, the size of the binary file must be lower than the SRAM size because the Xmodem protocol requires some SRAM memory to work. See Section 24.2 "Hardware and Software Constraints". 24.5.2 Xmodem Protocol The Xmodem protocol supported is the 128-byte length block. This protocol uses a two-character CRC-16 to guarantee detection of a maximum bit error. Xmodem protocol with CRC is accurate provided both sender and receiver report successful transmission. Each block of the transfer looks like: <SOH><blk #><255-blk #><--128 data bytes--><checksum> in which: <SOH> = 01 hex <blk #> = binary number, starts at 01, increments by 1, and wraps 0FFH to 00H (not to 01) <255-blk #> = 1's complement of the blk#. <checksum> = 2 bytes CRC16 Figure 24-2 shows a transmission using this protocol. Figure 24-2. Xmodem Transfer Example Host Device C SOH 01 FE Data[128] CRC CRC ACK SOH 02 FD Data[128] CRC CRC ACK SOH 03 FC Data[100] CRC CRC ACK EOT ACK 24.5.3 USB Device Port The device uses the USB communication device class (CDC) drivers to take advantage of the installed PC RS-232 software to talk over the USB. The CDC class is implemented in all releases of Windows (R) , beginning with Windows 98 SE. The CDC document, available at www.usb.org, describes a way to implement devices such as ISDN modems and virtual COM ports. The Vendor ID (VID) is Atmel's vendor ID 0x03EB. The product ID (PID) is 0x6124. These references are used by the host operating system to mount the correct driver. On Windows systems, the INF files contain the correspondence between vendor ID and product ID. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 427 For more details about VID/PID for End Product/Systems, please refer to the Vendor ID form available from the USB Implementers Forum on www.usb.org. Atmel provides an INF example to see the device as a new serial port and also provides another custom driver used by the SAM-BA application: atm6124.sys. Refer to the application note "USB Basic Application", Atmel literature number 6123, for more details. 24.5.3.1 Enumeration Process The USB protocol is a master/slave protocol. This is the host that starts the enumeration sending requests to the device through the control endpoint. The device handles standard requests as defined in the USB Specification. Table 24-3. Handled Standard Requests Request Definition GET_DESCRIPTOR Returns the current device configuration value. SET_ADDRESS Sets the device address for all future device access. SET_CONFIGURATION Sets the device configuration. GET_CONFIGURATION Returns the current device configuration value. GET_STATUS Returns status for the specified recipient. SET_FEATURE Set or Enable a specific feature. CLEAR_FEATURE Clear or Disable a specific feature. The device also handles some class requests defined in the CDC class. Table 24-4. Handled Class Requests Request Definition SET_LINE_CODING Configures DTE rate, stop bits, parity and number of character bits. GET_LINE_CODING Requests current DTE rate, stop bits, parity and number of character bits. SET_CONTROL_LINE_STATE RS-232 signal used to tell the DCE device the DTE device is now present. Unhandled requests are STALLed. 24.5.3.2 Communication Endpoints There are two communication endpoints and endpoint 0 is used for the enumeration process. Endpoint 1 is a 64byte Bulk OUT endpoint and endpoint 2 is a 64-byte Bulk IN endpoint. SAM-BA Boot commands are sent by the host through endpoint 1. If required, the message is split by the host into several data payloads by the host driver. If the command requires a response, the host can send IN transactions to pick up the response. 428 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 24.5.4 In Application Programming (IAP) Feature The IAP feature is a function located in ROM that can be called by any software application. When called, this function sends the desired FLASH command to the EEFC and waits for the Flash to be ready (looping while the FRDY bit is not set in the EEFC_FSR). Since this function is executed from ROM, this allows Flash programming (such as sector write) to be done by code running in Flash. The IAP function entry point is retrieved by reading the NMI vector in ROM (0x00800008). This function takes two arguments in parameter: the EFC number and the command to be sent to the EEFC. This function returns the value of the EEFC_FSR. IAP software code example: (unsigned int) (*IAP_Function)(unsigned long); void main (void){ unsigned unsigned unsigned unsigned long long long long FlashSectorNum = 200; // flash_cmd = 0; flash_status = 0; EFCIndex = 0; // 0:EEFC0, 1: EEFC1 /* Initialize the function pointer (retrieve function address from NMI vector) */ IAP_Function = ((unsigned long) (*)(unsigned long)) 0x00800008; /* Send your data to the sector here */ /* build the command to send to EEFC */ flash_cmd = (0x5A << 24) | (FlashSectorNum << 8) | AT91C_MC_FCMD_EWP; /* Call the IAP function with appropriate command */ flash_status = IAP_Function (EFCIndex, flash_cmd); } SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 429 25. Bus Matrix (MATRIX) 25.1 Description The Bus Matrix implements a multi-layer AHB that enables parallel access paths between multiple AHB masters and slaves in a system, thus increasing overall bandwidth. The Bus Matrix interconnects AHB masters to AHB slaves. The normal latency to connect a master to a slave is one cycle. The exception is the default master of the accessed slave which is connected directly (zero cycle latency). The Bus Matrix user interface also provides a System I/O Configuration user interface with registers that support application-specific features. 25.2 Master/Slave Management 25.2.1 Matrix Masters The Bus Matrix manages the masters listed in Table 25-1. Each master can perform an access to an available slave concurrently with other masters. Each master has its own specifically-defined decoder. To simplify addressing, all the masters have the same decoding. Table 25-1. List of Bus Matrix Masters Master 0 Cortex-M4 Instruction/Data Master 1 Cortex-M4 System Master 2 Peripheral DMA Controller (PDC) Master 3 CRC Calculation Unit 25.2.2 Matrix Slaves The Bus Matrix manages the slaves listed in Table 25-2. Each slave has its own arbiter providing a different arbitration per slave. Table 25-2. 430 List of Bus Matrix Slaves Slave 0 Internal SRAM Slave 1 Internal ROM Slave 2 Internal Flash Slave 3 External Bus Interface Slave 4 Peripheral Bridge SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 25.2.3 Master to Slave Access Table 25-3 gives valid paths for master to slave access on Matrix 0. The paths shown as "-" are forbidden or not wired, e.g. access from the Cortex-M4 S Bus to the internal ROM. Table 25-3. Master to Slave Access 0 1 2 3 Cortex-M4 I/D Bus Cortex-M4 S Bus PDC CRCCU Masters Slaves 25.3 0 Internal SRAM - X X X 1 Internal ROM X - X X 2 Internal Flash X - - X 3 External Bus Interface - X X X 4 Peripheral Bridge - X X - Memory Mapping The Bus Matrix provides one decoder for every AHB master interface. The decoder offers each AHB master several memory mappings. In fact, depending on the product, each memory area may be assigned to several slaves. Thus it is possible to boot at the same address while using different AHB slaves. 25.4 Special Bus Granting Techniques The Bus Matrix provides some speculative bus granting techniques in order to anticipate access requests from some masters. This technique reduces latency at the first access of a burst or single transfer. Bus granting sets a default master for every slave. At the end of the current access, if no other request is pending, the slave remains connected to its associated default master. A slave can be associated with one of the three implementations of default masters: No default master Last access master Fixed default master 25.4.1 No Default Master At the end of the current access, if no other request is pending, the slave is disconnected from all masters. No default master suits low-power mode. 25.4.2 Last Access Master At the end of the current access, if no other request is pending, the slave remains connected to the last master that performed an access request. 25.4.3 Fixed Default Master At the end of the current access, if no other request is pending, the slave connects to its fixed default master. Unlike the last access master, the fixed master does not change unless the user modifies it by software (field FIXED_DEFMSTR of the related MATRIX_SCFG). To change from one kind of default master to another, the Bus Matrix user interface provides the Slave Configuration registers (MATRIX_SCFGx), one for each slave, used to set a default master for each slave. MATRIX_SCFGx contains the fields DEFMSTR_TYPE and FIXED_DEFMSTR. The 2-bit DEFMSTR_TYPE field selects the default master type (no default, last access master, fixed default master) whereas the 4-bit FIXED_DEFMSTR field selects a fixed default master, provided that DEFMSTR_TYPE is set to fixed default master. Refer to Table 25-4, "Register Mapping". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 431 25.5 Arbitration The Bus Matrix provides an arbitration technique that reduces latency when conflicting cases occur; for example, when two or more masters try to access the same slave at the same time. One arbiter per AHB slave is provided to arbitrate each slave differently. The Bus Matrix provides the user with two arbitration types for each slave: 1. Round-robin arbitration (default) 2. Fixed priority arbitration The field ARBT of MATRIX_SCFG is used to select the type of arbitration. Each algorithm may be complemented by selecting a default master configuration for each slave. In case of re-arbitration, specific conditions apply. See Section 25.5.1 "Arbitration Rules". 25.5.1 Arbitration Rules Each arbiter has the ability to arbitrate between requests of two or more masters. To avoid burst breaking and to provide the maximum throughput for slave interfaces, arbitration should take place during the following cycles: 1. Idle cycles: When a slave is not connected to any master or is connected to a master which is not currently accessing it. 2. Single cycles: When a slave is performing a single access. 3. End of burst cycles: When the current cycle is the last cycle of a burst transfer. For a defined burst length, predicted end of burst matches the size of the transfer but is managed differently for undefined burst length. See Section 25.5.1.1 "Undefined Length Burst Arbitration" on page 432". 4. Slot cycle limit: When the slot cycle counter has reached the limit indicating that the current master access is too long and must be broken. See Section 25.5.1.2 "Slot Cycle Limit Arbitration" on page 432. 25.5.1.1 Undefined Length Burst Arbitration In order to prevent slave handling during undefined length bursts (INCR), the Bus Matrix provides specific logic to re-arbitrate before the end of the INCR transfer. A predicted end of burst is used for defined length burst transfer, which is selected between the following: 1. Infinite: No predicted end of burst is generated and therefore INCR burst transfer will never be broken. 2. Four-beat bursts: Predicted end of burst is generated at the end of each four beat boundary inside INCR transfer. 3. Eight-beat bursts: Predicted end of burst is generated at the end of each eight beat boundary inside INCR transfer. 4. Sixteen-beat bursts: Predicted end of burst is generated at the end of each sixteen beat boundary inside INCR transfer. This selection can be done through the field ULBT of the Master Configuration Registers (MATRIX_MCFG). 25.5.1.2 Slot Cycle Limit Arbitration The Bus Matrix contains specific logic to break accesses that are too long, such as very long bursts on a very slow slave (e.g. an external low-speed memory). At the beginning of the burst access, a counter is loaded with the value previously written in the SLOT_CYCLE field of the related MATRIX_SCFG and decreased at each clock cycle. When the counter reaches zero, the arbiter has the ability to re-arbitrate at the end of the current byte, half-word or word transfer. 25.5.2 Round-Robin Arbitration Bus Matrix arbiters use the round-robin algorithm to dispatch the requests from different masters to the same slave. If two or more masters make a request at the same time, the master with the lowest number is serviced first. The others are then serviced in a round-robin manner. 432 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Three round-robin algorithms are implemented: 25.5.2.1 Round-Robin arbitration without default master Round-Robin arbitration with last access master Round-Robin arbitration with fixed default master Round-Robin arbitration without default master Round-robin arbitration without default master is the main algorithm used by Bus Matrix arbiters. It allows the Bus Matrix to dispatch requests from different masters to the same slave in a pure round-robin manner. At the end of the current access, if no other request is pending, the slave is disconnected from all masters. This configuration incurs one latency cycle for the first access of a burst. Arbitration without default master can be used for masters that perform significant bursts. 25.5.2.2 Round-Robin arbitration with last access master Round-robin arbitration with last access master is a biased round-robin algorithm used by Bus Matrix arbiters. It allows the Bus Matrix to remove the one latency cycle for the last master that accessed the slave. At the end of the current transfer, if no other master request is pending, the slave remains connected to the last master that performs the access. Other non-privileged masters incur one latency cycle if they want to access the same slave. This technique can be used for masters that mainly perform single accesses. 25.5.2.3 Round-Robin arbitration with fixed default master Round-robin arbitration with fixed default master is an algorithm used by the Bus Matrix arbiters to remove the one latency cycle for the fixed default master per slave. At the end of the current access, the slave remains connected to its fixed default master. Every request attempted by the fixed default master does not incur latency, whereas other non-privileged masters still incur one latency cycle. This technique can be used for masters that mainly perform single accesses. 25.5.3 Fixed Priority Arbitration The fixed priority arbitration algorithm is used by the Bus Matrix arbiters to dispatch the requests from different masters to the same slave by using the fixed priority defined by the user. If requests from two or more masters are active at the same time, the master with the highest priority is serviced first. If requests from two or more masters with the same priority are active at the same time, the master with the highest number is serviced first. For each slave, the priority of each master may be defined through the Priority registers for slaves (MATRIX_PRAS and MATRIX_PRBS). 25.6 System I/O Configuration The System I/O Configuration register (CCFG_SYSIO) configures I/O lines in system I/O mode (such as JTAG, ERASE, USB, etc.) or as general-purpose I/O lines. Enabling or disabling the corresponding I/O lines in peripheral mode or in PIO mode (PIO_PER or PIO_PDR registers) in the PIO controller has no effect. However, the direction (input or output), pull-up, pull-down and other mode control is still managed by the PIO controller. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 433 25.7 Register Write Protection To prevent any single software error from corrupting MATRIX behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the "Write Protection Mode Register" (MATRIX_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the "Write Protection Status Register" (MATRIX_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading MATRIX_WPSR. The following registers can be write-protected: 434 "Bus Matrix Master Configuration Registers" "Bus Matrix Slave Configuration Registers" "Bus Matrix Priority Registers For Slaves" "System I/O Configuration Register" SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 25.8 Bus Matrix (MATRIX) (MATRIX) User Interface Table 25-4. Register Mapping Offset Register Name Access Reset 0x0000 Master Configuration Register 0 MATRIX_MCFG0 Read/Write 0x00000000 0x0004 Master Configuration Register 1 MATRIX_MCFG1 Read/Write 0x00000000 0x0008 Master Configuration Register 2 MATRIX_MCFG2 Read/Write 0x00000000 0x000C Master Configuration Register 3 MATRIX_MCFG3 Read/Write 0x00000000 - - - 0x0010 - 0x003C Reserved 0x0040 Slave Configuration Register 0 MATRIX_SCFG0 Read/Write 0x00010010 0x0044 Slave Configuration Register 1 MATRIX_SCFG1 Read/Write 0x00050010 0x0048 Slave Configuration Register 2 MATRIX_SCFG2 Read/Write 0x00000010 0x004C Slave Configuration Register 3 MATRIX_SCFG3 Read/Write 0x00000010 0x0050 Slave Configuration Register 4 MATRIX_SCFG4 Read/Write 0x00000010 - - - MATRIX_PRAS0 Read/Write 0x00000000 - - - MATRIX_PRAS1 Read/Write 0x00000000 - - - MATRIX_PRAS2 Read/Write 0x00000000 - - - MATRIX_PRAS3 Read/Write 0x00000000 - - - MATRIX_PRAS4 Read/Write 0x00000000 - - - Read/Write 0x00000000 - - Read/Write 0x00000000 - - - 0x0054 - 0x007C Reserved 0x0080 Priority Register A for Slave 0 0x0084 Reserved 0x0088 Priority Register A for Slave 1 0x008C Reserved 0x0090 Priority Register A for Slave 2 0x0094 Reserved 0x0098 Priority Register A for Slave 3 0x009C Reserved 0x00A0 Priority Register A for Slave 4 0x00A4 - 0x0110 Reserved 0x0114 System I/O Configuration register 0x0118 Reserved 0x011C SMC Chip Select NAND Flash Assignment Register 0x0120 - 0x010C Reserved CCFG_SYSIO - CCFG_SMCNFCS 0x1E4 Write Protection Mode Register MATRIX_WPMR Read/Write 0x0 0x1E8 Write Protection Status Register MATRIX_WPSR Read-only 0x0 - - - 0x0110 - 0x01FC Reserved SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 435 25.8.1 Bus Matrix Master Configuration Registers Name: MATRIX_MCFG0..MATRIX_MCFG3 Address: 0x400E0200 Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - - ULBT * ULBT: Undefined Length Burst Type Value 436 Name Description 0 INFINITE No predicted end of burst is generated and therefore INCR bursts coming from this master cannot be broken. 1 SINGLE The undefined length burst is treated as a succession of single access allowing rearbitration at each beat of the INCR burst. 2 FOUR_BEAT The undefined length burst is split into a 4-beat bursts allowing rearbitration at each 4-beat burst end. 3 EIGHT_BEAT The undefined length burst is split into 8-beat bursts allowing rearbitration at each 8-beat burst end. 4 SIXTEEN_BEAT The undefined length burst is split into 16-beat bursts allowing rearbitration at each 16-beat burst end. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 25.8.2 Bus Matrix Slave Configuration Registers Name: MATRIX_SCFG0..MATRIX_SCFG4 Address: 0x400E0240 Access: Read/Write 31 30 29 28 27 26 - - - - - - 23 22 21 20 19 18 - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 FIXED_DEFMSTR 25 24 ARBT 17 16 DEFMSTR_TYPE SLOT_CYCLE * SLOT_CYCLE: Maximum Number of Allowed Cycles for a Burst When the SLOT_CYCLE limit is reach for a burst, it may be broken by another master trying to access this slave. This limit has been placed to avoid locking very slow slaves when very long bursts are used. This limit should not be very small. An unreasonably small value will break every burst and the Bus Matrix will spend its time to arbitrate without performing any data transfer. 16 cycles is a reasonable value for SLOT_CYCLE. * DEFMSTR_TYPE: Default Master Type Value 0 1 2 Name NO_DEFAULT LAST FIXED Description At the end of current slave access, if no other master request is pending, the slave is disconnected from all masters. This results in having a one cycle latency for the first access of a burst transfer or for a single access. At the end of current slave access, if no other master request is pending, the slave stays connected to the last master having accessed it. This results in not having the one cycle latency when the last master tries to access the slave again. At the end of the current slave access, if no other master request is pending, the slave connects to the fixed master the number that has been written in the FIXED_DEFMSTR field. This results in not having the one cycle latency when the fixed master tries to access the slave again. * FIXED_DEFMSTR: Fixed Default Master This is the number of the default master for this slave. Only used if DEFMSTR_TYPE is 2. Specifying the number of a master which is not connected to the selected slave is equivalent to setting DEFMSTR_TYPE to 0. * ARBT: Arbitration Type Value Name Description 0 ROUND_ROBIN Round-robin arbitration 1 FIXED_PRIORITY Fixed priority arbitration SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 437 25.8.3 Bus Matrix Priority Registers For Slaves Name: MATRIX_PRAS0..MATRIX_PRAS4 Address: 0x400E0280 [0], 0x400E0288 [1], 0x400E0290 [2], 0x400E0298 [3], 0x400E02A0 [4] Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 - - - - - - 15 14 13 12 11 10 - - - - 7 6 - - M3PR 5 4 M1PR 3 2 - - 16 M4PR 9 8 M2PR 1 0 M0PR * MxPR: Master x Priority Fixed priority of master x for accessing the selected slave. The higher the number, the higher the priority. 438 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 25.8.4 System I/O Configuration Register Name: CCFG_SYSIO Address: 0x400E0314 Access Read/Write Reset: 0x0000_0000 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - SYSIO12 SYSIO11 SYSIO10 - - 7 6 5 4 3 2 1 0 SYSIO7 SYSIO6 SYSIO5 SYSIO4 - - - - * SYSIO4: PB4 or TDI Assignment 0: TDI function selected. 1: PB4 function selected. * SYSIO5: PB5 or TDO/TRACESWO Assignment 0: TDO/TRACESWO function selected. 1: PB5 function selected. * SYSIO6: PB6 or TMS/SWDIO Assignment 0: TMS/SWDIO function selected. 1: PB6 function selected. * SYSIO7: PB7 or TCK/SWCLK Assignment 0: TCK/SWCLK function selected. 1: PB7 function selected. * SYSIO10: PB10 or DDM Assignment 0: DDM function selected. 1: PB10 function selected. * SYSIO11: PB11 or DDP Assignment 0: DDP function selected. 1: PB11 function selected. * SYSIO12: PB12 or ERASE Assignment 0: ERASE function selected. 1: PB12 function selected. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 439 25.8.5 SMC NAND Flash Chip Select Configuration Register Name: CCFG_SMCNFCS Address: 0x400E031C Type: Read/Write Reset: 0x0000_0000 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - SMC_NFCS3 SMC_NFCS2 SMC_NFCS1 SMC_NFCS0 * SMC_NFCS0: SMC NAND Flash Chip Select 0 Assignment 0: NCS0 is not assigned to a NAND Flash (NANDOE and NANWE not used for NCS0) 1: NCS0 is assigned to a NAND Flash (NANDOE and NANWE used for NCS0) * SMC_NFCS1: SMC NAND Flash Chip Select 1 Assignment 0: NCS1 is not assigned to a NAND Flash (NANDOE and NANWE not used for NCS1) 1: NCS1 is assigned to a NAND Flash (NANDOE and NANWE used for NCS1) * SMC_NFCS2: SMC NAND Flash Chip Select 2 Assignment 0: NCS2 is not assigned to a NAND Flash (NANDOE and NANWE not used for NCS2) 1: NCS2 is assigned to a NAND Flash (NANDOE and NANWE used for NCS2) * SMC_NFCS3: SMC NAND Flash Chip Select 3 Assignment 0: NCS3 is not assigned to a NAND Flash (NANDOE and NANWE not used for NCS3) 1: NCS3 is assigned to a NAND Flash (NANDOE and NANWE used for NCS3) 440 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 25.8.6 Write Protection Mode Register Name: MATRIX_WPMR Address: 0x400E03E4 Access: Read/Write Reset: See Table 25-4 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 6 5 4 3 2 1 0 - - - - - - - WPEN * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x4D4154 ("MAT" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x4D4154 ("MAT" in ASCII). See Section 25.7 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protect Key Value Name 0x4D4154 PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 441 25.8.7 Write Protection Status Register Name: MATRIX_WPSR Address: 0x400E03E8 Access: Read-only Reset: See Table 25-4 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 11 10 9 8 WPVSRC 15 14 13 12 WPVSRC 7 6 5 4 3 2 1 0 - - - - - - - WPVS * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the MATRIX_WPSR. 1: A write protection violation has occurred since the last read of the MATRIX_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. 442 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26. Static Memory Controller (SMC) 26.1 Description The External Bus Interface (EBI) is designed to ensure the successful data transfer between several external devices and the ARM-based microcontroller. The Static Memory Controller (SMC) is part of the EBI. This SMC can handle several types of external memory and peripheral devices, such as SRAM, PSRAM, PROM, EPROM, EEPROM, LCD Module, NOR Flash and NAND Flash. The SMC generates the signals that control the access to the external memory devices or peripheral devices. It has 4 Chip Selects, a 24-bit address bus, and an 8-bit data bus. Separate read and write control signals allow for direct memory and peripheral interfacing. Read and write signal waveforms are fully adjustable. The SMC can manage wait requests from external devices to extend the current access. The SMC is provided with an automatic Slow clock mode. In Slow clock mode, it switches from user-programmed waveforms to slow-rate specific waveforms on read and write signals. The SMC supports asynchronous burst read in Page mode access for page sizes up to 32 bytes. The External Data Bus can be scrambled/unscrambled by means of user keys. 26.2 Embedded Characteristics Four Chip Selects Available 16-Mbyte Address Space per Chip Select 8-bit Data Bus Zero Wait State Scrambling/Unscrambling Function with User Key Word, Halfword, Byte Transfers Programmable Setup, Pulse And Hold Time for Read Signals per Chip Select Programmable Setup, Pulse And Hold Time for Write Signals per Chip Select Programmable Data Float Time per Chip Select External Wait Request Automatic Switch to Slow Clock Mode Asynchronous Read in Page Mode Supported: Page Size Ranges from 4 to 32 Bytes Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 443 26.3 I/O Lines Description Table 26-1. I/O Line Description Name Description Type Active Level NCS[3:0] Static Memory Controller Chip Select Lines Output Low NRD Read Signal Output Low NWE Write Enable Signal Output Low A[23:0] Address Bus Output - D[7:0] Data Bus I/O - NWAIT External Wait Signal Input Low NANDCS NAND Flash Chip Select Line Output Low NANDOE NAND Flash Output Enable Output Low NANDWE NAND Flash Write Enable Output Low NANDALE NAND Flash Address Latch Enable Output - NANDCLE NAND Flash Command Latch Enable Output - 26.4 Product Dependencies 26.4.1 I/O Lines The pins used for interfacing the SMC are multiplexed with the PIO lines. The programmer must first program the PIO controller to assign the SMC pins to their peripheral function. If I/O Lines of the SMC are not used by the application, they can be used for other purposes by the PIO Controller. Table 26-2. 444 I/O Lines Instance Signal I/O Line Peripheral SMC A0 PC18 A SMC A1 PC19 A SMC A2 PC20 A SMC A3 PC21 A SMC A4 PC22 A SMC A5 PC23 A SMC A6 PC24 A SMC A7 PC25 A SMC A8 PC26 A SMC A9 PC27 A SMC A10 PC28 A SMC A11 PC29 A SMC A12 PC30 A SMC A13 PC31 A SMC A14 PA18 C SMC A15 PA19 C SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 26-2. I/O Lines SMC A16 PA20 C SMC A17 PA0 C SMC A18 PA1 C SMC A19 PA23 C SMC A20 PA24 C SMC A21/NANDALE PC16 A SMC A22/NANDCLE PC17 A SMC A23 PA25 C SMC D0 PC0 A SMC D1 PC1 A SMC D2 PC2 A SMC D3 PC3 A SMC D4 PC4 A SMC D5 PC5 A SMC D6 PC6 A SMC D7 PC7 A SMC NANDOE PC9 A SMC NANDWE PC10 A SMC NCS0 PC14 A SMC NCS1 PC15 A SMC NCS2 PA22 C SMC NCS3 PC12 A SMC NRD PC11 A SMC NWAIT PC13 A SMC NWE PC8 A 26.4.2 Power Management The SMC is clocked through the Power Management Controller (PMC), thus the programmer must first configure the PMC to enable the SMC clock. 26.5 Multiplexed Signals Table 26-3. Static Memory Controller (SMC) Multiplexed Signals Multiplexed Signals Related Function A22 NANDCLE NAND Flash Command Latch Enable A21 NANDALE NAND Flash Address Latch Enable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 445 26.6 External Memory Mapping The SMC provides up to 24 address lines, A[23:0]. This allows each chip select line to address up to 16 Mbytes of memory. If the physical memory device connected on one chip select is smaller than 16 Mbytes, it wraps around and appears to be repeated within this space. The SMC correctly handles any valid access to the memory device within the page (see Figure 26-1). Figure 26-1. Memory Connections for Four External Devices NCS[0] - NCS[3] NRD SMC NWE A[23:0] D[7:0] NCS3 NCS2 NCS1 NCS0 Memory Enable Memory Enable Memory Enable Memory Enable Output Enable Write Enable 24 8 26.7 A[23:0] D[7:0] Connection to External Devices 26.7.1 Data Bus Width The data bus width is 8 bits. Figure 26-2 shows how to connect a 512-Kbyte x 8-bit memory on NCS2. Figure 26-2. Memory Connection for an 8-bit Data Bus SMC D[7:0] D[7:0] A[18:2] A[18:2] A1 A1 A0 A0 NWE Write Enable NRD Output Enable NCS[2] 446 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Memory Enable 26.7.2 NAND Flash Support The SMC integrates circuitry that interfaces to NAND Flash devices. The NAND Flash logic is driven by the SMC. It depends on the programming of the SMC_NFCSx field in the CCFG_SMCNFCS register on the Bus Matrix User Interface. For details on this register, refer to the section "Bus Matrix (MATRIX)" of this datasheet. Access to an external NAND Flash device via the address space reserved to the chip select programmed. The user can connect up to four NAND Flash devices with separate chip selects. The NAND Flash logic drives the read and write command signals of the SMC on the NANDOE and NANDWE signals when the NCSx programmed is active. NANDOE and NANDWE are disabled as soon as the transfer address fails to lie in the NCSx programmed address space. Figure 26-3. NAND Flash Signal Multiplexing on SMC Pins SMC NAND Flash Logic NCSx (activated if SMC_NFCSx=1) * NRD NANDOE NANDWE NANDOE NANDWE NWE * in CCFG_SMCNFCS Matrix register Note: When the NAND Flash logic is activated, (SMC_NFCSx=1), the NWE pin cannot be used in PIO mode but only in Peripheral mode (NWE function). If the NWE function is not used for other external memories (SRAM, LCD), it must be configured in one of the following modes: - PIO Input with pull-up enabled (default state after reset) - PIO Output set at level 1 The address latch enable and command latch enable signals on the NAND Flash device are driven by address bits A22 and A21of the address bus. Any bit of the address bus can also be used for this purpose. The command, address or data words on the data bus of the NAND Flash device use their own addresses within the NCSx address space (configured by the register CCFG_SMCNFCS on the Bus Matrix User Interface). The chip enable (CE) signal of the device and the ready/busy (R/B) signals are connected to PIO lines. The CE signal then remains asserted even when NCS3 is not selected, preventing the device from returning to Standby mode. The NANDCS output signal should be used in accordance with the external NAND Flash device type. Two types of CE behavior exist depending on the NAND Flash device: Standard NAND Flash devices require that the CE pin remains asserted Low continuously during the read busy period to prevent the device from returning to Standby mode. Since the SMC asserts the NCSx signal High, it is necessary to connect the CE pin of the NAND Flash device to a GPIO line, in order to hold it low during the busy period preceding data read out. This restriction has been removed for "CE don't care" NAND Flash devices. The NCSx signal can be directly connected to the CE pin of the NAND Flash device. Figure 26-4 illustrates both topologies: Standard and "CE don't care" NAND Flash. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 447 Figure 26-4. Standard and "CE don't care" NAND Flash Application Examples D[7:0] D[7:0] AD[7:0] A[22:21] A[22:21] ALE CLE NCSx NCSx CE SMC NAND Flash "CE don't care" NAND Flash NANDOE NANDOE NOE NANDWE 26.8 ALE CLE Not Connected SMC AD[7:0] NOE NANDWE NWE PIO CE PIO R/B PIO NWE R/B Application Example 26.8.1 Implementation Examples Hardware configurations are given for illustration only. The user should refer to the manufacturer web site to check for memory device availability. For hardware implementation examples, refer to the evaluation kit schematics for this microcontroller, which show examples of a connection to an LCD module and NAND Flash. 448 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.8.1.1 8-bit NAND Flash Hardware Configuration D[0..7] U1 CLE ALE NANDOE NANDWE (ANY PIO) (ANY PIO) R1 3V3 R2 10K 16 17 8 18 9 CLE ALE RE WE CE 7 R/B 19 WP 1 2 3 4 5 6 10 11 14 15 20 21 22 23 24 25 26 N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C N.C 10K K9F2G08U0M I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 29 30 31 32 41 42 43 44 N.C N.C N.C N.C N.C N.C PRE N.C N.C N.C N.C N.C 48 47 46 45 40 39 38 35 34 33 28 27 VCC VCC 37 12 VSS VSS 36 13 2 Gb D0 D1 D2 D3 D4 D5 D6 D7 3V3 C2 100NF C1 100NF TSOP48 PACKAGE Software Configuration Perform the following configuration: 1. Assign the SMC_NFCSx (for example SMC_NFCS3) field in the CCFG_SMCNFCS register on the Bus Matrix User Interface. 2. Reserve A21 / A22 for ALE / CLE functions. Address and Command Latches are controlled by setting the address bits A21 and A22, respectively, during accesses. 3. NANDOE and NANDWE signals are multiplexed with PIO lines. Thus, the dedicated PIOs must be programmed in Peripheral mode in the PIO controller. 4. Configure a PIO line as an input to manage the Ready/Busy signal. 5. Configure SMC CS3 Setup, Pulse, Cycle and Mode according to NAND Flash timings, the data bus width and the system bus frequency. In this example, the NAND Flash is not addressed as a "CE don't care". To address it as a "CE don't care", connect NCS3 (if SMC_NFCS3 is set) to the NAND Flash CE. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 449 26.8.1.2 NOR Flash Hardware Configuration D[0..7] A[0..21] U1 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 D0 D1 D2 D3 D4 D5 D6 D7 3V3 VCCQ NRST NWE 3V3 NCS0 NRD RESET WE WP VPP CE OE C2 100NF VCC VSS VSS C1 100NF Software Configuration Configure the SMC CS0 Setup, Pulse, Cycle and Mode depending on Flash timings and system bus frequency. 26.9 Standard Read and Write Protocols In the following sections, NCS represents one of the NCS[0..3] chip select lines. 26.9.1 Read Waveforms The read cycle is shown on Figure 26-5. The read cycle starts with the address setting on the memory address bus. 450 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 26-5. Standard Read Cycle MCK A[23:0] NRD NCS D[7:0] NRD_SETUP NCS_RD_SETUP NRD_PULSE NRD_HOLD NCS_RD_PULSE NCS_RD_HOLD NRD_CYCLE 26.9.1.1 NRD Waveform The NRD signal is characterized by a setup timing, a pulse width and a hold timing. NRD_SETUP--the NRD setup time is defined as the setup of address before the NRD falling edge; NRD_PULSE--the NRD pulse length is the time between NRD falling edge and NRD rising edge; NRD_HOLD--the NRD hold time is defined as the hold time of address after the NRD rising edge. 26.9.1.2 NCS Waveform The NCS signal can be divided into a setup time, pulse length and hold time: 26.9.1.3 NCS_RD_SETUP--the NCS setup time is defined as the setup time of address before the NCS falling edge. NCS_RD_PULSE-- the NCS pulse length is the time between NCS falling edge and NCS rising edge; NCS_RD_HOLD--the NCS hold time is defined as the hold time of address after the NCS rising edge. Read Cycle The NRD_CYCLE time is defined as the total duration of the read cycle, i.e., from the time where address is set on the address bus to the point where address may change. The total read cycle time is equal to: NRD_CYCLE = NRD_SETUP + NRD_PULSE + NRD_HOLD = NCS_RD_SETUP + NCS_RD_PULSE + NCS_RD_HOLD All NRD and NCS timings are defined separately for each chip select as an integer number of Master Clock cycles. To ensure that the NRD and NCS timings are consistent, user must define the total read cycle instead of the hold timing. NRD_CYCLE implicitly defines the NRD hold time and NCS hold time as: NRD_HOLD = NRD_CYCLE - NRD SETUP - NRD PULSE NCS_RD_HOLD = NRD_CYCLE - NCS_RD_SETUP - NCS_RD_PULSE 26.9.1.4 Null Delay Setup and Hold If null setup and hold parameters are programmed for NRD and/or NCS, NRD and NCS remain active continuously in case of consecutive read cycles in the same memory (see Figure 26-6). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 451 Figure 26-6. No Setup, No Hold on NRD and NCS Read Signals MCK A[23:0] NRD NCS D[7:0] NRD_PULSE 26.9.1.5 NRD_PULSE NRD_PULSE NCS_RD_PULSE NCS_RD_PULSE NCS_RD_PULSE NRD_CYCLE NRD_CYCLE NRD_CYCLE Null Pulse Programming null pulse is not permitted. Pulse must be at least set to 1. A null value leads to unpredictable behavior. 26.9.2 Read Mode As NCS and NRD waveforms are defined independently of one other, the SMC needs to know when the read data is available on the data bus. The SMC does not compare NCS and NRD timings to know which signal rises first. The READ_MODE parameter in the SMC_MODE register of the corresponding chip select indicates which signal of NRD and NCS controls the read operation. 26.9.2.1 Read is Controlled by NRD (READ_MODE = 1): Figure 26-7 shows the waveforms of a read operation of a typical asynchronous RAM. The read data is available tPACC after the falling edge of NRD, and turns to `Z' after the rising edge of NRD. In this case, the READ_MODE must be set to 1 (read is controlled by NRD), to indicate that data is available with the rising edge of NRD. The SMC samples the read data internally on the rising edge of Master Clock that generates the rising edge of NRD, whatever the programmed waveform of NCS may be. 452 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 26-7. READ_MODE = 1: Data is sampled by SMC before the rising edge of NRD MCK A[23:0] NRD NCS tPACC D[7:0] Data Sampling SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 453 26.9.2.2 Read is Controlled by NCS (READ_MODE = 0) Figure 26-8 shows the typical read cycle of an LCD module. The read data is valid tPACC after the falling edge of the NCS signal and remains valid until the rising edge of NCS. Data must be sampled when NCS is raised. In that case, the READ_MODE must be set to 0 (read is controlled by NCS): the SMC internally samples the data on the rising edge of Master Clock that generates the rising edge of NCS, whatever the programmed waveform of NRD may be. Figure 26-8. READ_MODE = 0: Data is sampled by SMC before the rising edge of NCS MCK A[23:0] NRD NCS tPACC D[7:0] Data Sampling 454 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.9.3 Write Waveforms The write protocol is similar to the read protocol. It is depicted in Figure 26-9. The write cycle starts with the address setting on the memory address bus. 26.9.3.1 NWE Waveforms The NWE signal is characterized by a setup timing, a pulse width and a hold timing. NWE_SETUP--the NWE setup time is defined as the setup of address and data before the NWE falling edge; NWE_PULSE--the NWE pulse length is the time between NWE falling edge and NWE rising edge; NWE_HOLD--the NWE hold time is defined as the hold time of address and data after the NWE rising edge. 26.9.3.2 NCS Waveforms The NCS signal waveforms in write operation are not the same that those applied in read operations, but are separately defined: NCS_WR_SETUP--the NCS setup time is defined as the setup time of address before the NCS falling edge. NCS_WR_PULSE--the NCS pulse length is the time between NCS falling edge and NCS rising edge; NCS_WR_HOLD--the NCS hold time is defined as the hold time of address after the NCS rising edge. Figure 26-9. Write Cycle MCK A[23:0] NWE NCS NWE_SETUP NCS_WR_SETUP NWE_PULSE NCS_WR_PULSE NWE_HOLD NCS_WR_HOLD NWE_CYCLE 26.9.3.3 Write Cycle The write_cycle time is defined as the total duration of the write cycle, that is, from the time where address is set on the address bus to the point where address may change. The total write cycle time is equal to: NWE_CYCLE=NWE_SETUP + NWE_PULSE + NWE_HOLD=NCS_WR_SETUP + NCS_WR_PULSE + NCS_WR_HOLD All NWE and NCS (write) timings are defined separately for each chip select as an integer number of Master Clock cycles. To ensure that the NWE and NCS timings are consistent, the user must define the total write cycle instead of the hold timing. This implicitly defines the NWE hold time and NCS (write) hold times as: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 455 NWE_HOLD = NWE_CYCLE - NWE_SETUP - NWE_PULSE NCS_WR_HOLD = NWE_CYCLE - NCS_WR_SETUP - NCS_WR_PULSE 26.9.3.4 Null Delay Setup and Hold If null setup parameters are programmed for NWE and/or NCS, NWE and/or NCS remain active continuously in case of consecutive write cycles in the same memory (see Figure 26-10). However, for devices that perform write operations on the rising edge of NWE or NCS, such as SRAM, either a setup or a hold must be programmed. Figure 26-10. Null Setup and Hold Values of NCS and NWE in Write Cycle MCK A[23:0] NWE NCS D[7:0] 26.9.3.5 NWE_PULSE NWE_PULSE NWE_PULSE NCS_WR_PULSE NCS_WR_PULSE NCS_WR_PULSE NWE_CYCLE NWE_CYCLE NWE_CYCLE Null Pulse Programming null pulse is not permitted. Pulse must be at least set to 1. A null value leads to unpredictable behavior. 26.9.4 Write Mode The bit WRITE_MODE in the SMC_MODE register of the corresponding chip select indicates which signal controls the write operation. 26.9.4.1 Write is Controlled by NWE (WRITE_MODE = 1): Figure 26-11 shows the waveforms of a write operation with WRITE_MODE set . The data is put on the bus during the pulse and hold steps of the NWE signal. The internal data buffers are switched to Output mode after the NWE_SETUP time, and until the end of the write cycle, regardless of the programmed waveform on NCS. 456 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 26-11. WRITE_MODE = 1. The write operation is controlled by NWE MCK A[23:0] NWE NCS D[7:0] 26.9.4.2 Write is Controlled by NCS (WRITE_MODE = 0) Figure 26-12 shows the waveforms of a write operation with WRITE_MODE cleared. The data is put on the bus during the pulse and hold steps of the NCS signal. The internal data buffers are switched to Output mode after the NCS_WR_SETUP time, and until the end of the write cycle, regardless of the programmed waveform on NWE. Figure 26-12. WRITE_MODE = 0. The write operation is controlled by NCS MCK A[23:0] NWE NCS D[7:0] 26.9.5 Register Write Protection To prevent any single software error that may corrupt SMC behavior, the registers listed below can be writeprotected by setting the WPEN bit in the SMC Write Protection Mode register (SMC_WPMR). If a write access in a write-protected register is detected, the WPVS flag in the SMC Write Protection Status register (SMC_WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted. The WPVS flag is automatically cleared after reading the SSMC_WPSR. The following registers can be write-protected: "SMC Setup Register" "SMC Pulse Register" SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 457 "SMC Cycle Register" "SMC MODE Register" 26.9.6 Coding Timing Parameters All timing parameters are defined for one chip select and are grouped together in one SMC_REGISTER according to their type. The SMC_SETUP register groups the definition of all setup parameters: NRD_SETUP, NCS_RD_SETUP, NWE_SETUP, NCS_WR_SETUP The SMC_PULSE register groups the definition of all pulse parameters: NRD_PULSE, NCS_RD_PULSE, NWE_PULSE, NCS_WR_PULSE The SMC_CYCLE register groups the definition of all cycle parameters: NRD_CYCLE, NWE_CYCLE Table 26-4 shows how the timing parameters are coded and their permitted range. Table 26-4. Coding and Range of Timing Parameters Permitted Range Coded Value Number of Bits Effective Value Coded Value Effective Value setup [5:0] 6 128 x setup[5] + setup[4:0] 0 31 0 128+31 pulse [6:0] 7 256 x pulse[6] + pulse[5:0] 0 63 0 256+63 cycle [8:0] 9 256 x cycle[8:7] + cycle[6:0] 0 127 0 512+127 0 256+127 0 768+127 26.9.7 Reset Values of Timing Parameters Table 26-5 gives the default value of timing parameters at reset. Table 26-5. Reset Values of Timing Parameters Register Reset Value Definition SMC_SETUP 0x01010101 All setup timings are set to 1. SMC_PULSE 0x01010101 All pulse timings are set to 1. SMC_CYCLE 0x00030003 The read and write operations last 3 Master Clock cycles and provide one hold cycle. WRITE_MODE 1 Write is controlled with NWE. READ_MODE 1 Read is controlled with NRD. 26.9.8 Usage Restriction The SMC does not check the validity of the user-programmed parameters. If the sum of SETUP and PULSE parameters is larger than the corresponding CYCLE parameter, this leads to unpredictable behavior of the SMC. For read operations: Null but positive setup and hold of address and NRD and/or NCS can not be guaranteed at the memory interface because of the propagation delay of theses signals through external logic and pads. If positive setup and hold values must be verified, then it is strictly recommended to program non-null values so as to cover possible skews between address, NCS and NRD signals. 458 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 For write operations: If a null hold value is programmed on NWE, the SMC can guarantee a positive hold of address and NCS signal after the rising edge of NWE. This is true for WRITE_MODE = 1 only. See Section 26.11.2 "Early Read Wait State". For read and write operations: a null value for pulse parameters is forbidden and may lead to unpredictable behavior. In read and write cycles, the setup and hold time parameters are defined in reference to the address bus. For external devices that require setup and hold time between NCS and NRD signals (read), or between NCS and NWE signals (write), these setup and hold times must be converted into setup and hold times in reference to the address bus. 26.10 Scrambling/Unscrambling Function The external data bus can be scrambled in order to prevent intellectual property data located in off-chip memories from being easily recovered by analyzing data at the package pin level of either microcontroller or memory device. The scrambling and unscrambling are performed on-the-fly without additional wait states. The scrambling/unscrambling function can be enabled or disabled by configuring the CSxSE bits in the SMC OCMS Mode Register (SMC_OCMS). When multiple chip selects are handled, it is possible to configure the scrambling function per chip select using the CSxSE bits in the SMC_OCMS register. The scrambling method depends on two user-configurable key registers, SMC_KEY1 and SMC_KEY2. These key registers are only accessible in Write mode. The scrambling user key or the seed for key generation must be securely stored in a reliable non-volatile memory in order to recover data from the off-chip memory. Any data scrambled with a given key cannot be recovered if the key is lost. 26.11 Automatic Wait States Under certain circumstances, the SMC automatically inserts idle cycles between accesses to avoid bus contention or operation conflict. 26.11.1 Chip Select Wait States The SMC always inserts an idle cycle between two transfers on separate chip selects. This idle cycle ensures that there is no bus contention between the de-activation of one device and the activation of the next one. During chip select wait state, all control lines are turned inactive: NWR, NCS[0..3], NRD lines are all set to 1. Figure 26-13 illustrates a chip select wait state between access on Chip Select 0 and Chip Select 2. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 459 Figure 26-13. Chip Select Wait State between a Read Access on NCS0 and a Write Access on NCS2 MCK A[23:0] NRD NWE NCS0 NCS2 NRD_CYCLE NWE_CYCLE D[7:0] Read to Write Wait State Chip Select Wait State 26.11.2 Early Read Wait State In some cases, the SMC inserts a wait state cycle between a write access and a read access to allow time for the write cycle to end before the subsequent read cycle begins. This wait state is not generated in addition to a chip select wait state. The early read cycle thus only occurs between a write and read access to the same memory device (same chip select). An early read wait state is automatically inserted if at least one of the following conditions is valid: 460 if the write controlling signal has no hold time and the read controlling signal has no setup time (Figure 2614). in NCS Write controlled mode (WRITE_MODE = 0), if there is no hold timing on the NCS signal and the NCS_RD_SETUP parameter is set to 0, regardless of the Read mode (Figure 26-15). The write operation must end with a NCS rising edge. Without an Early Read Wait State, the write operation could not complete properly. in NWE controlled mode (WRITE_MODE = 1) and if there is no hold timing (NWE_HOLD = 0), the feedback of the write control signal is used to control address, data, and chip select lines. If the external write control signal is not inactivated as expected due to load capacitances, an Early Read Wait State is inserted and address, data and control signals are maintained one more cycle. See Figure 26-16. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 26-14. Early Read Wait State: Write with No Hold Followed by Read with No Setup MCK A[23:0] NWE NRD no hold no setup D[7:0] write cycle Early Read wait state read cycle Figure 26-15. Early Read Wait State: NCS Controlled Write with No Hold Followed by a Read with No NCS Setup MCK A[23:0] NCS NRD no hold no setup D[7:0] write cycle (WRITE_MODE = 0) read cycle Early Read wait state (READ_MODE = 0 or READ_MODE = 1) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 461 Figure 26-16. Early Read Wait State: NWE-controlled Write with No Hold Followed by a Read with one Set-up Cycle MCK A[25:2] internal write controlling signal external write controlling signal (NWE) no hold read setup = 1 NRD D[7:0] write cycle Early Read read cycle (WRITE_MODE = 1) wait state (READ_MODE = 0 or READ_MODE = 1) 26.11.3 Reload User Configuration Wait State The user may change any of the configuration parameters by writing the SMC user interface. When detecting that a new user configuration has been written in the user interface, the SMC inserts a wait state before starting the next access. This "Reload User Configuration Wait State" is used by the SMC to load the new set of parameters to apply to next accesses. The Reload Configuration Wait State is not applied in addition to the Chip Select Wait State. If accesses before and after re-programming the user interface are made to different devices (Chip Selects), then one single Chip Select Wait State is applied. On the other hand, if accesses before and after writing the user interface are made to the same device, a Reload Configuration Wait State is inserted, even if the change does not concern the current Chip Select. 26.11.3.1 User Procedure To insert a Reload Configuration Wait State, the SMC detects a write access to any SMC_MODE register of the user interface. If the user only modifies timing registers (SMC_SETUP, SMC_PULSE, SMC_CYCLE registers) in the user interface, he must validate the modification by writing the SMC_MODE, even if no change was made on the mode parameters. The user must not change the configuration parameters of an SMC Chip Select (Setup, Pulse, Cycle, Mode) if accesses are performed on this CS during the modification. Any change of the Chip Select parameters, while fetching the code from a memory connected on this CS, may lead to unpredictable behavior. The instructions used to modify the parameters of an SMC Chip Select can be executed from the internal RAM or from a memory connected to another CS. 462 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.11.3.2 Slow Clock Mode Transition A Reload Configuration Wait State is also inserted when the Slow Clock mode is entered or exited, after the end of the current transfer (see Section 26.14 "Slow Clock Mode"). 26.11.4 Read to Write Wait State Due to an internal mechanism, a wait cycle is always inserted between consecutive read and write SMC accesses. This wait cycle is referred to as a read to write wait state in this document. This wait cycle is applied in addition to chip select and reload user configuration wait states when they are to be inserted. See Figure 26-13 on page 460. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 463 26.12 Data Float Wait States Some memory devices are slow to release the external bus. For such devices, it is necessary to add wait states (data float wait states) after a read access: before starting a read access to a different external memory before starting a write access to the same device or to a different external one. The Data Float Output Time (tDF) for each external memory device is programmed in the TDF_CYCLES field of the SMC_MODE register for the corresponding chip select. The value of TDF_CYCLES indicates the number of data float wait cycles (between 0 and 15) before the external device releases the bus, and represents the time allowed for the data output to go to high impedance after the memory is disabled. Data float wait states do not delay internal memory accesses. Hence, a single access to an external memory with long tDF will not slow down the execution of a program from internal memory. The data float wait states management depends on the READ_MODE and the TDF_MODE fields of the SMC_MODE register for the corresponding chip select. 26.12.1 READ_MODE Setting the READ_MODE to 1 indicates to the SMC that the NRD signal is responsible for turning off the tri-state buffers of the external memory device. The Data Float Period then begins after the rising edge of the NRD signal and lasts TDF_CYCLES MCK cycles. When the read operation is controlled by the NCS signal (READ_MODE = 0), the TDF field gives the number of MCK cycles during which the data bus remains busy after the rising edge of NCS. Figure 26-17 illustrates the Data Float Period in NRD-controlled mode (READ_MODE =1), assuming a data float period of 2 cycles (TDF_CYCLES = 2). Figure 26-18 shows the read operation when controlled by NCS (READ_MODE = 0) and the TDF_CYCLES parameter equals 3. Figure 26-17. TDF Period in NRD Controlled Read Access (TDF = 2) MCK A[23:0] NRD NCS tpacc D[7:0] TDF = 2 clock cycles NRD controlled read operation 464 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 26-18. TDF Period in NCS Controlled Read Operation (TDF = 3) MCK A[23:0] NRD NCS tpacc D[7:0] TDF = 3 clock cycles NCS controlled read operation 26.12.2 TDF Optimization Enabled (TDF_MODE = 1) When the TDF_MODE of the SMC_MODE register is set to 1 (TDF optimization is enabled), the SMC takes advantage of the setup period of the next access to optimize the number of wait states cycle to insert. Figure 26-19 shows a read access controlled by NRD, followed by a write access controlled by NWE, on Chip Select 0. Chip Select 0 has been programmed with: NRD_HOLD = 4; READ_MODE = 1 (NRD controlled) NWE_SETUP = 3; WRITE_MODE = 1 (NWE controlled) TDF_CYCLES = 6; TDF_MODE = 1 (optimization enabled). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 465 Figure 26-19. TDF Optimization: No TDF wait states are inserted if the TDF period is over when the next access begins MCK NRD NRD_HOLD= 4 NWE NWE_SETUP= 3 NCS0 TDF_CYCLES = 6 D[7:0] read access on NCS0 (NRD controlled) Read to Write Wait State write access on NCS0 (NWE controlled) 26.12.3 TDF Optimization Disabled (TDF_MODE = 0) When optimization is disabled, tdf wait states are inserted at the end of the read transfer, so that the data float period is ended when the second access begins. If the hold period of the read1 controlling signal overlaps the data float period, no additional tdf wait states will be inserted. Figure 26-20, Figure 26-21 and Figure 26-22 illustrate the cases: read access followed by a read access on another chip select, read access followed by a write access on another chip select, read access followed by a write access on the same chip select, with no TDF optimization. 466 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 26-20. TDF Optimization Disabled (TDF Mode = 0): TDF wait states between 2 read accesses on different chip selects MCK A[23:0] read1 controlling signal (NRD) read1 hold = 1 read2 controlling signal (NRD) read2 setup = 1 TDF_CYCLES = 6 D[7:0] 5 TDF WAIT STATES read 2 cycle TDF_MODE = 0 (optimization disabled) read1 cycle TDF_CYCLES = 6 Chip Select Wait State Figure 26-21. TDF Mode = 0: TDF wait states between a read and a write access on different chip selects MCK A[23:0] read1 controlling signal (NRD) read1 hold = 1 write2 controlling signal (NWE) write2 setup = 1 TDF_CYCLES = 4 D[7:0] 2 TDF WAIT STATES read1 cycle TDF_CYCLES = 4 Read to Write Chip Select Wait State Wait State write2 cycle TDF_MODE = 0 (optimization disabled) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 467 Figure 26-22. TDF Mode = 0: TDF wait states between read and write accesses on the same chip select MCK A[23:0] read1 controlling signal (NRD) write2 setup = 1 read1 hold = 1 write2 controlling signal (NWE) TDF_CYCLES = 5 D[7:0] 4 TDF WAIT STATES read1 cycle TDF_CYCLES = 5 Read to Write Wait State write2 cycle TDF_MODE = 0 (optimization disabled) 26.13 External Wait Any access can be extended by an external device using the NWAIT input signal of the SMC. The EXNW_MODE field of the SMC_MODE register on the corresponding chip select must be set either to "10" (Frozen mode) or "11" (Ready mode). When the EXNW_MODE is set to "00" (disabled), the NWAIT signal is simply ignored on the corresponding chip select. The NWAIT signal delays the read or write operation in regards to the read or write controlling signal, depending on the Read and Write modes of the corresponding chip select. 26.13.1 Restriction When one of the EXNW_MODE is enabled, it is mandatory to program at least one hold cycle for the read/write controlling signal. For that reason, the NWAIT signal cannot be used in Page mode (Section 26.15 "Asynchronous Page Mode"), or in Slow clock mode (Section 26.14 "Slow Clock Mode"). The NWAIT signal is assumed to be a response of the external device to the read/write request of the SMC. Then NWAIT is examined by the SMC only in the pulse state of the read or write controlling signal. The assertion of the NWAIT signal outside the expected period has no impact on SMC behavior. 468 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.13.2 Frozen Mode When the external device asserts the NWAIT signal (active low), and after internal synchronization of this signal, the SMC state is frozen, i.e., SMC internal counters are frozen, and all control signals remain unchanged. When the resynchronized NWAIT signal is deasserted, the SMC completes the access, resuming the access from the point where it was stopped. See Figure 26-23. This mode must be selected when the external device uses the NWAIT signal to delay the access and to freeze the SMC. The assertion of the NWAIT signal outside the expected period is ignored as illustrated in Figure 26-24. Figure 26-23. Write Access with NWAIT Assertion in Frozen Mode (EXNW_MODE = 10) MCK A[23:0] FROZEN STATE 4 3 2 1 1 1 1 0 3 2 2 2 2 1 NWE 6 5 4 0 NCS D[7:0] NWAIT internally synchronized NWAIT signal Write cycle EXNW_MODE = 10 (Frozen) WRITE_MODE = 1 (NWE_controlled) NWE_PULSE = 5 NCS_WR_PULSE = 7 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 469 Figure 26-24. Read Access with NWAIT Assertion in Frozen Mode (EXNW_MODE = 10) MCK A[23:0] FROZEN STATE NCS NRD 4 1 3 2 2 2 1 0 2 1 0 2 1 0 0 5 5 5 4 3 NWAIT internally synchronized NWAIT signal Read cycle EXNW_MODE = 10 (Frozen) READ_MODE = 0 (NCS_controlled) NRD_PULSE = 2, NRD_HOLD = 6 NCS_RD_PULSE =5, NCS_RD_HOLD =3 470 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Assertion is ignored 26.13.3 Ready Mode In Ready mode (EXNW_MODE = 11), the SMC behaves differently. Normally, the SMC begins the access by down counting the setup and pulse counters of the read/write controlling signal. In the last cycle of the pulse phase, the resynchronized NWAIT signal is examined. If asserted, the SMC suspends the access as shown in Figure 26-25 and Figure 26-26. After deassertion, the access is completed: the hold step of the access is performed. This mode must be selected when the external device uses deassertion of the NWAIT signal to indicate its ability to complete the read or write operation. If the NWAIT signal is deasserted before the end of the pulse, or asserted after the end of the pulse of the controlling read/write signal, it has no impact on the access length as shown in Figure 26-26. Figure 26-25. NWAIT Assertion in Write Access: Ready Mode (EXNW_MODE = 11) MCK A[23:0] Wait STATE 4 3 2 1 0 0 0 3 2 1 1 1 NWE 6 5 4 0 NCS D[7:0] NWAIT internally synchronized NWAIT signal Write cycle EXNW_MODE = 11 (Ready mode) WRITE_MODE = 1 (NWE_controlled) NWE_PULSE = 5 NCS_WR_PULSE = 7 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 471 Figure 26-26. NWAIT Assertion in Read Access: Ready Mode (EXNW_MODE = 11) MCK A[23:0] Wait STATE 6 5 4 3 2 1 0 0 6 5 4 3 2 1 1 NCS NRD 0 NWAIT internally synchronized NWAIT signal Read cycle Assertion is ignored EXNW_MODE = 11(Ready mode) READ_MODE = 0 (NCS_controlled) NRD_PULSE = 7 NCS_RD_PULSE =7 472 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Assertion is ignored 26.13.4 NWAIT Latency and Read/Write Timings There may be a latency between the assertion of the read/write controlling signal and the assertion of the NWAIT signal by the device. The programmed pulse length of the read/write controlling signal must be at least equal to this latency plus the 2 cycles of resynchronization + one cycle. Otherwise, the SMC may enter the hold state of the access without detecting the NWAIT signal assertion. This is true in Frozen mode as well as in Ready mode. This is illustrated on Figure 26-27. When EXNW_MODE is enabled (ready or frozen), the user must program a pulse length of the read and write controlling signal of at least: minimal pulse length = NWAIT latency + 2 resynchronization cycles + one cycle Figure 26-27. NWAIT Latency MCK A[23:0] WAIT STATE 4 3 2 1 0 0 0 NRD minimal pulse length NWAIT intenally synchronized NWAIT signal NWAIT latency 2 cycle resynchronization Read cycle EXNW_MODE = 10 or 11 READ_MODE = 1 (NRD_controlled) NRD_PULSE = 5 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 473 26.14 Slow Clock Mode The SMC is able to automatically apply a set of "Slow clock mode" read/write waveforms when an internal signal driven by the Power Management Controller is asserted because MCK has been turned to a very slow clock rate (typically 32kHz clock rate). In this mode, the user-programmed waveforms are ignored and the Slow clock mode waveforms are applied. This mode is provided so as to avoid reprogramming the User Interface with appropriate waveforms at very slow clock rate. When activated, the Slow mode is active on all chip selects. 26.14.1 Slow Clock Mode Waveforms Figure 26-28 illustrates the read and write operations in Slow clock mode. They are valid on all chip selects. Table 26-6 indicates the value of read and write parameters in Slow clock mode. Figure 26-28. Read/Write Cycles in Slow Clock Mode MCK MCK A[23:0] A[23:0] NWE 1 NRD 1 1 1 1 NCS NCS NRD_CYCLE = 2 NWE_CYCLE = 3 SLOW CLOCK MODE WRITE Table 26-6. Read and Write Timing Parameters in Slow Clock Mode Read Parameters 474 SLOW CLOCK MODE READ Duration (cycles) Write Parameters Duration (cycles) NRD_SETUP 1 NWE_SETUP 1 NRD_PULSE 1 NWE_PULSE 1 NCS_RD_SETUP 0 NCS_WR_SETUP 0 NCS_RD_PULSE 2 NCS_WR_PULSE 3 NRD_CYCLE 2 NWE_CYCLE 3 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.14.2 Switching from (to) Slow Clock Mode to (from) Normal Mode When switching from Slow clock mode to Normal mode, the current Slow clock mode transfer is completed at high clock rate, with the set of Slow clock mode parameters.See Figure 26-29. The external device may not be fast enough to support such timings. Figure 26-30 illustrates the recommended procedure to properly switch from one mode to the other. Figure 26-29. Clock Rate Transition Occurs while the SMC is Performing a Write Operation Slow Clock Mode internal signal from PMC MCK A[23:0] NWE 1 1 1 1 1 1 3 2 2 NCS NWE_CYCLE = 3 SLOW CLOCK MODE WRITE NWE_CYCLE = 7 SLOW CLOCK MODE WRITE This write cycle finishes with the slow clock mode set of parameters after the clock rate transition NORMAL MODE WRITE Slow clock mode transition is detected: Reload Configuration Wait State Figure 26-30. Recommended Procedure to Switch from Slow Clock Mode to Normal Mode or from Normal Mode to Slow Clock Mode Slow Clock Mode internal signal from PMC MCK A[23:0] NWE 1 1 1 3 2 2 NCS SLOW CLOCK MODE WRITE IDLE STATE NORMAL MODE WRITE Reload Configuration Wait State SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 475 26.15 Asynchronous Page Mode The SMC supports asynchronous burst reads in Page mode, providing that the Page mode is enabled in the SMC_MODE register (PMEN field). The page size must be configured in the SMC_MODE register (PS field) to 4, 8, 16 or 32 bytes. The page defines a set of consecutive bytes into memory. A 4-byte page (resp. 8-, 16-, 32-byte page) is always aligned to 4-byte boundaries (resp. 8-, 16-, 32-byte boundaries) of memory. The MSB of data address defines the address of the page in memory, the LSB of address define the address of the data in the page as detailed in Table 26-7. With Page mode memory devices, the first access to one page (tpa) takes longer than the subsequent accesses to the page (tsa) as shown in Figure 26-31. When in Page mode, the SMC enables the user to define different read timings for the first access within one page, and next accesses within the page. Table 26-7. Page Address and Data Address within a Page Page Size Page Address(1) Data Address in the Page 4 bytes A[23:2] A[1:0] 8 bytes A[23:3] A[2:0] 16 bytes A[23:4] A[3:0] 32 bytes A[23:5] A[4:0] Note: 1. "A" denotes the address bus of the memory device. 26.15.1 Protocol and Timings in Page Mode Figure 26-31 shows the NRD and NCS timings in Page mode access. Figure 26-31. Page Mode Read Protocol (Address MSB and LSB are defined in Table 26-7) MCK A[MSB] A[LSB] NRD tpa NCS tsa tsa D[7:0] NCS_RD_PULSE NRD_PULSE NRD_PULSE The NRD and NCS signals are held low during all read transfers, whatever the programmed values of the setup and hold timings in the User Interface may be. Moreover, the NRD and NCS timings are identical. The pulse length of the first access to the page is defined with the NCS_RD_PULSE field of the SMC_PULSE register. The pulse length of subsequent accesses within the page are defined using the NRD_PULSE parameter. 476 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 In Page mode, the programming of the read timings is described in Table 26-8: Table 26-8. Programming of Read Timings in Page Mode Parameter Value Definition READ_MODE `x' No impact NCS_RD_SETUP `x' No impact NCS_RD_PULSE tpa Access time of first access to the page NRD_SETUP `x' No impact NRD_PULSE tsa Access time of subsequent accesses in the page NRD_CYCLE `x' No impact The SMC does not check the coherency of timings. It will always apply the NCS_RD_PULSE timings as page access timing (tpa) and the NRD_PULSE for accesses to the page (tsa), even if the programmed value for tpa is shorter than the programmed value for tsa. 26.15.2 Page Mode Restriction The Page mode is not compatible with the use of the NWAIT signal. Using the Page mode and the NWAIT signal may lead to unpredictable behavior. 26.15.3 Sequential and Non-sequential Accesses If the chip select and the MSB of addresses as defined in Table 26-7 are identical, then the current access lies in the same page as the previous one, and no page break occurs. Using this information, all data within the same page, sequential or not sequential, are accessed with a minimum access time (tsa). Figure 26-32 illustrates access to an 8-bit memory device in Page mode, with 8-byte pages. Access to D1 causes a page access with a long access time (tpa). Accesses to D3 and D7, though they are not sequential accesses, only require a short access time (tsa). If the MSB of addresses are different, the SMC performs the access of a new page. In the same way, if the chip select is different from the previous access, a page break occurs. If two sequential accesses are made to the Page mode memory, but separated by an other internal or external peripheral access, a page break occurs on the second access because the chip select of the device was deasserted between both accesses. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 477 Figure 26-32. Access to Non-Sequential Data within the Same Page MCK Page address A[23:3] A[2], A1, A0 A1 A3 A7 NRD NCS D[7:0] D1 NCS_RD_PULSE 478 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 D3 NRD_PULSE D7 NRD_PULSE 26.16 Static Memory Controller (SMC) User Interface The SMC is programmed using the registers listed in Table 26-9. For each chip select, a set of four registers is used to program the parameters of the external device connected on it. In Table 26-9, "CS_number" denotes the chip select number. 16 bytes (0x10) are required per chip select. The user must complete writing the configuration by writing any one of the SMC_MODE registers. Table 26-9. Register Mapping Offset Register Name Access Reset 0x10 x CS_number + 0x00 SMC Setup Register SMC_SETUP Read/Write 0x01010101 0x10 x CS_number + 0x04 SMC Pulse Register SMC_PULSE Read/write 0x01010101 0x10 x CS_number + 0x08 SMC Cycle Register SMC_CYCLE Read/Write 0x00030003 0x10 x CS_number + 0x0C SMC MODE Register SMC_MODE Read/Write 0x10000003 0x80 SMC OCMS MODE Register SMC_OCMS Read/Write 0x00000000 0x84 SMC OCMS KEY1 Register SMC_KEY1 Write Once 0x00000000 0x88 SMC OCMS KEY2 Register SMC_KEY2 Write Once 0x00000000 0xE4 SMC Write Protection Mode Register SMC_WPMR Read/Write 0x00000000 0xE8 SMC Write Protection Status Register SMC_WPSR Read-only 0x00000000 0xEC-0xFC Reserved - - - Notes: 1. All unlisted offset values are considered as `reserved'. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 479 26.16.1 SMC Setup Register Name: SMC_SETUP[0..3] Address: 0x400E0000 [0], 0x400E0010 [1], 0x400E0020 [2], 0x400E0030 [3] Access: Read/Write 31 - 30 - 29 28 27 26 NCS_RD_SETUP 25 24 23 - 22 - 21 20 19 18 17 16 15 - 14 - 13 12 11 10 NCS_WR_SETUP 9 8 7 - 6 - 5 4 3 1 0 NRD_SETUP 2 NWE_SETUP This register can only be written if the WPEN bit is cleared in the "SMC Write Protection Mode Register" . * NWE_SETUP: NWE Setup Length The NWE signal setup length is defined as: NWE setup length = (128* NWE_SETUP[5] + NWE_SETUP[4:0]) clock cycles * NCS_WR_SETUP: NCS Setup Length in WRITE Access In write access, the NCS signal setup length is defined as: NCS setup length = (128* NCS_WR_SETUP[5] + NCS_WR_SETUP[4:0]) clock cycles * NRD_SETUP: NRD Setup Length The NRD signal setup length is defined in clock cycles as: NRD setup length = (128* NRD_SETUP[5] + NRD_SETUP[4:0]) clock cycles * NCS_RD_SETUP: NCS Setup Length in READ Access In read access, the NCS signal setup length is defined as: NCS setup length = (128* NCS_RD_SETUP[5] + NCS_RD_SETUP[4:0]) clock cycles 480 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.16.2 SMC Pulse Register Name: SMC_PULSE[0..3] Address: 0x400E0004 [0], 0x400E0014 [1], 0x400E0024 [2], 0x400E0034 [3] Access: Read/Write 31 - 30 29 28 27 NCS_RD_PULSE 26 25 24 23 - 22 21 20 19 NRD_PULSE 18 17 16 15 - 14 13 12 11 NCS_WR_PULSE 10 9 8 7 - 6 5 4 3 NWE_PULSE 2 1 0 This register can only be written if the WPEN bit is cleared in the "SMC Write Protection Mode Register" . * NWE_PULSE: NWE Pulse Length The NWE signal pulse length is defined as: NWE pulse length = (256* NWE_PULSE[6] + NWE_PULSE[5:0]) clock cycles The NWE pulse length must be at least 1 clock cycle. * NCS_WR_PULSE: NCS Pulse Length in WRITE Access In write access, the NCS signal pulse length is defined as: NCS pulse length = (256* NCS_WR_PULSE[6] + NCS_WR_PULSE[5:0]) clock cycles The NCS pulse length must be at least 1 clock cycle. * NRD_PULSE: NRD Pulse Length In standard read access, the NRD signal pulse length is defined in clock cycles as: NRD pulse length = (256* NRD_PULSE[6] + NRD_PULSE[5:0]) clock cycles The NRD pulse length must be at least 1 clock cycle. In Page mode read access, the NRD_PULSE parameter defines the duration of the subsequent accesses in the page. * NCS_RD_PULSE: NCS Pulse Length in READ Access In standard read access, the NCS signal pulse length is defined as: NCS pulse length = (256* NCS_RD_PULSE[6] + NCS_RD_PULSE[5:0]) clock cycles The NCS pulse length must be at least 1 clock cycle. In Page mode read access, the NCS_RD_PULSE parameter defines the duration of the first access to one page. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 481 26.16.3 SMC Cycle Register Name: SMC_CYCLE[0..3] Address: 0x400E0008 [0], 0x400E0018 [1], 0x400E0028 [2], 0x400E0038 [3] Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 NRD_CYCLE 23 22 21 20 19 18 17 16 11 - 10 - 9 - 8 NWE_CYCLE 3 2 1 0 NRD_CYCLE 15 - 14 - 13 - 12 - 7 6 5 4 NWE_CYCLE This register can only be written if the WPEN bit is cleared in the "SMC Write Protection Mode Register" . * NWE_CYCLE: Total Write Cycle Length The total write cycle length is the total duration in clock cycles of the write cycle. It is equal to the sum of the setup, pulse and hold steps of the NWE and NCS signals. It is defined as: Write cycle length = (NWE_CYCLE[8:7]*256 + NWE_CYCLE[6:0]) clock cycles * NRD_CYCLE: Total Read Cycle Length The total read cycle length is the total duration in clock cycles of the read cycle. It is equal to the sum of the setup, pulse and hold steps of the NRD and NCS signals. It is defined as: Read cycle length = (NRD_CYCLE[8:7]*256 + NRD_CYCLE[6:0]) clock cycles 482 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.16.4 SMC MODE Register Name: SMC_MODE[0..3] Address: 0x400E000C [0], 0x400E001C [1], 0x400E002C [2], 0x400E003C [3] Access: Read/Write 31 - 30 - 29 28 27 - 26 - 25 - 23 - 22 - 21 - 20 TDF_MODE 19 18 17 TDF_CYCLES 16 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 4 3 - 2 - 1 WRITE_MODE 0 READ_MODE PS EXNW_MODE 24 PMEN This register can only be written if the WPEN bit is cleared in the "SMC Write Protection Mode Register" . * READ_MODE: Read Mode 0: The read operation is controlled by the NCS signal. - If TDF cycles are programmed, the external bus is marked busy after the rising edge of NCS. - If TDF optimization is enabled (TDF_MODE =1), TDF wait states are inserted after the setup of NCS. 1: The read operation is controlled by the NRD signal. - If TDF cycles are programmed, the external bus is marked busy after the rising edge of NRD. - If TDF optimization is enabled (TDF_MODE =1), TDF wait states are inserted after the setup of NRD. * WRITE_MODE: Write Mode 0: The write operation is controlled by the NCS signal. - If TDF optimization is enabled (TDF_MODE =1), TDF wait states will be inserted after the setup of NCS. 1: The write operation is controlled by the NWE signal. - If TDF optimization is enabled (TDF_MODE =1), TDF wait states will be inserted after the setup of NWE. * EXNW_MODE: NWAIT Mode The NWAIT signal is used to extend the current read or write signal. It is only taken into account during the pulse phase of the read and write controlling signal. When the use of NWAIT is enabled, at least one cycle hold duration must be programmed for the read and write controlling signal. Value Name Description 0 DISABLED Disabled 1 - Reserved 2 FROZEN Frozen Mode 3 READY Ready Mode * Disabled Mode: The NWAIT input signal is ignored on the corresponding Chip Select. * Frozen Mode: If asserted, the NWAIT signal freezes the current read or write cycle. After deassertion, the read/write cycle is resumed from the point where it was stopped. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 483 * Ready Mode: The NWAIT signal indicates the availability of the external device at the end of the pulse of the controlling read or write signal, to complete the access. If high, the access normally completes. If low, the access is extended until NWAIT returns high. * TDF_CYCLES: Data Float Time This field gives the integer number of clock cycles required by the external device to release the data after the rising edge of the read controlling signal. The SMC always provide one full cycle of bus turnaround after the TDF_CYCLES period. The external bus cannot be used by another chip select during TDF_CYCLES + 1 cycles. From 0 up to 15 TDF_CYCLES can be set. * TDF_MODE: TDF Optimization 0: TDF optimization is disabled. - The number of TDF wait states is inserted before the next access begins. 1: TDF optimization is enabled. - The number of TDF wait states is optimized using the setup period of the next read/write access. * PMEN: Page Mode Enabled 0: Standard read is applied. 1: Asynchronous burst read in Page mode is applied on the corresponding chip select. * PS: Page Size If Page mode is enabled, this field indicates the size of the page in bytes. Value 484 Name Description 0 4_BYTE 4-byte page 1 8_BYTE 8-byte page 2 16_BYTE 16-byte page 3 32_BYTE 32-byte page SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.16.5 SMC OCMS Mode Register Name: SMC_OCMS Address: 0x400E0080 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 CS3SE 18 CS2SE 17 CS1SE 16 CS0SE 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 SMSE * CSxSE: Chip Select (x = 0 to 3) Scrambling Enable 0: Disable scrambling for CSx. 1: Enable scrambling for CSx. * SMSE: Static Memory Controller Scrambling Enable 0: Disable scrambling for SMC access. 1: Enable scrambling for SMC access. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 485 26.16.6 SMC OCMS Key1 Register Name: SMC_KEY1 Address: 0x400E0084 Access: Write Once 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 KEY1 23 22 21 20 KEY1 15 14 13 12 KEY1 7 6 5 4 KEY1 * KEY1: Off Chip Memory Scrambling (OCMS) Key Part 1 When off-chip memory scrambling is enabled, setting the SMC_OCMS and SMC_TIMINGS registers in accordance, the data scrambling depends on KEY1 and KEY2 values. 486 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.16.7 SMC OCMS Key2 Register Name: SMC_KEY2 Address: 0x400E0088 Access: Write Once 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 KEY2 23 22 21 20 KEY2 15 14 13 12 KEY2 7 6 5 4 KEY2 * KEY2: Off Chip Memory Scrambling (OCMS) Key Part 2 When off-chip memory scrambling is enabled, setting the SMC_OCMS and SMC_TIMINGS registers in accordance, the data scrambling depends on KEY2 and KEY1 values. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 487 26.16.8 SMC Write Protection Mode Register Name: SMC_WPMR Address: 0x400E00E4 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 -- 2 -- 1 -- 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 -- 6 -- 5 -- 4 -- * WPEN: Write Protect Enable 0: Disables the write protection if WPKEY corresponds to 0x534D43 ("SMC" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x534D43 ("SMC" in ASCII). See Section 26.9.5 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protection Key Value Name 0x534D43 PASSWD 488 Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 26.16.9 SMC Write Protection Status Register Name: SMC_WPSR Address: 0x400E00E8 Type: Read-only 31 -- 30 -- 29 -- 28 -- 27 -- 26 -- 25 -- 24 -- 23 22 21 20 19 18 17 16 11 10 9 8 3 -- 2 -- 1 -- 0 WPVS WPVSRC 15 14 13 12 WPVSRC 7 -- 6 -- 5 -- 4 -- * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the SMC_WPSR register. 1: A write protection violation has occurred since the last read of the SMC_WPSR register. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 489 27. Peripheral DMA Controller (PDC) 27.1 Description The Peripheral DMA Controller (PDC) transfers data between on-chip serial peripherals and the target memories. The link between the PDC and a serial peripheral is operated by the AHB to APB bridge. The user interface of each PDC channel is integrated into the user interface of the peripheral it serves. The user interface of mono-directional channels (receive-only or transmit-only) contains two 32-bit memory pointers and two 16-bit counters, one set (pointer, counter) for the current transfer and one set (pointer, counter) for the next transfer. The bidirectional channel user interface contains four 32-bit memory pointers and four 16-bit counters. Each set (pointer, counter) is used by the current transmit, next transmit, current receive and next receive. Using the PDC decreases processor overhead by reducing its intervention during the transfer. This lowers significantly the number of clock cycles required for a data transfer, improving microcontroller performance. To launch a transfer, the peripheral triggers its associated PDC channels by using transmit and receive signals. When the programmed data is transferred, an end of transfer interrupt is generated by the peripheral itself. 27.2 490 Embedded Characteristics Performs Transfers to/from APB Communication Serial Peripherals Supports Half-duplex and Full-duplex Peripherals SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27.3 Peripheral DMA Controller Connections The Peripheral DMA Controller handles the data transfer between peripherals and memory and receives triggers from the peripherals listed in the following table. The Peripheral DMA Controller handles transfer requests from the channel according to the following priorities (Channel 0 is high priority): Table 27-1. Peripheral DMA Controller Instance Name Channel T/R Channel Number PWM Transmit 21 TWI1 Transmit 20 TWI0 Transmit 19 UART1 Transmit 18 UART0 Transmit 17 USART1 Transmit 16 USART0 Transmit 15 DACC Transmit 14 SPI Transmit 13 SSC Transmit 12 HSMCI Transmit 11 PIOA Receive 10 TWI1 Receive 9 TWI0 Receive 8 UART1 Receive 7 UART0 Receive 6 USART1 Receive 5 USART0 Receive 4 ADC Receive 3 SPI Receive 2 SSC Receive 1 HSMCI Receive 0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 491 27.4 Block Diagram Figure 27-1. Block Diagram FULL DUPLEX PERIPHERAL PDC THR PDC Channel A RHR PDC Channel B Control Status & Control HALF DUPLEX PERIPHERAL Control THR PDC Channel C RHR Control Status & Control RECEIVE or TRANSMIT PERIPHERAL RHR or THR Control 492 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 PDC Channel D Status & Control 27.5 Functional Description 27.5.1 Configuration The PDC channel user interface enables the user to configure and control data transfers for each channel. The user interface of each PDC channel is integrated into the associated peripheral user interface. The user interface of a serial peripheral, whether it is full- or half-duplex, contains four 32-bit pointers (RPR, RNPR, TPR, TNPR) and four 16-bit counter registers (RCR, RNCR, TCR, TNCR). However, the transmit and receive parts of each type are programmed differently: the transmit and receive parts of a full-duplex peripheral can be programmed at the same time, whereas only one part (transmit or receive) of a half-duplex peripheral can be programmed at a time. 32-bit pointers define the access location in memory for the current and next transfer, whether it is for read (transmit) or write (receive). 16-bit counters define the size of the current and next transfers. It is possible, at any moment, to read the number of transfers remaining for each channel. The PDC has dedicated status registers which indicate if the transfer is enabled or disabled for each channel. The status for each channel is located in the associated peripheral status register. Transfers can be enabled and/or disabled by setting TXTEN/TXTDIS and RXTEN/RXTDIS in the peripheral's Transfer Control register. At the end of a transfer, the PDC channel sends status flags to its associated peripheral. These flags are visible in the peripheral Status register (ENDRX, ENDTX, RXBUFF, and TXBUFE). Refer to Section 27.5.3 and to the associated peripheral user interface. The peripheral where a PDC transfer is configured must have its peripheral clock enabled. The peripheral clock must be also enabled to access the PDC register set associated to this peripheral. 27.5.2 Memory Pointers Each full-duplex peripheral is connected to the PDC by a receive channel and a transmit channel. Both channels have 32-bit memory pointers that point to a receive area and to a transmit area, respectively, in the target memory. Each half-duplex peripheral is connected to the PDC by a bidirectional channel. This channel has two 32-bit memory pointers, one for current transfer and the other for next transfer. These pointers point to transmit or receive data depending on the operating mode of the peripheral. Depending on the type of transfer (byte, half-word or word), the memory pointer is incremented respectively by 1, 2 or 4 bytes. If a memory pointer address changes in the middle of a transfer, the PDC channel continues operating using the new address. 27.5.3 Transfer Counters Each channel has two 16-bit counters, one for the current transfer and the one for the next transfer. These counters define the size of data to be transferred by the channel. The current transfer counter is decremented first as the data addressed by the current memory pointer starts to be transferred. When the current transfer counter reaches zero, the channel checks its next transfer counter. If the value of the next counter is zero, the channel stops transferring data and sets the appropriate flag. If the next counter value is greater than zero, the values of the next pointer/next counter are copied into the current pointer/current counter and the channel resumes the transfer, whereas next pointer/next counter get zero/zero as values.At the end of this transfer, the PDC channel sets the appropriate flags in the Peripheral Status register. The following list gives an overview of how status register flags behave depending on the counters' values: ENDRX flag is set when the PDC Receive Counter Register (PERIPH_RCR) reaches zero. RXBUFF flag is set when both PERIPH_RCR and the PDC Receive Next Counter Register (PERIPH_RNCR) reach zero. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 493 ENDTX flag is set when the PDC Transmit Counter Register (PERIPH_TCR) reaches zero. TXBUFE flag is set when both PERIPH_TCR and the PDC Transmit Next Counter Register (PERIPH_TNCR) reach zero. These status flags are described in the Transfer Status Register (PERIPH_PTSR). 27.5.4 Data Transfers The serial peripheral triggers its associated PDC channels' transfers using transmit enable (TXEN) and receive enable (RXEN) flags in the transfer control register integrated in the peripheral's user interface. When the peripheral receives external data, it sends a Receive Ready signal to its PDC receive channel which then requests access to the Matrix. When access is granted, the PDC receive channel starts reading the peripheral Receive Holding register (RHR). The read data are stored in an internal buffer and then written to memory. When the peripheral is about to send data, it sends a Transmit Ready to its PDC transmit channel which then requests access to the Matrix. When access is granted, the PDC transmit channel reads data from memory and transfers the data to the Transmit Holding register (THR) of its associated peripheral. The same peripheral sends data depending on its mechanism. 27.5.5 PDC Flags and Peripheral Status Register Each peripheral connected to the PDC sends out receive ready and transmit ready flags and the PDC returns flags to the peripheral. All these flags are only visible in the peripheral's Status register. Depending on whether the peripheral is half- or full-duplex, the flags belong to either one single channel or two different channels. 27.5.5.1 Receive Transfer End The receive transfer end flag is set when PERIPH_RCR reaches zero and the last data has been transferred to memory. This flag is reset by writing a non-zero value to PERIPH_RCR or PERIPH_RNCR. 27.5.5.2 Transmit Transfer End The transmit transfer end flag is set when PERIPH_TCR reaches zero and the last data has been written to the peripheral THR. This flag is reset by writing a non-zero value to PERIPH_TCR or PERIPH_TNCR. 27.5.5.3 Receive Buffer Full The receive buffer full flag is set when PERIPH_RCR reaches zero, with PERIPH_RNCR also set to zero and the last data transferred to memory. This flag is reset by writing a non-zero value to PERIPH_TCR or PERIPH_TNCR. 27.5.5.4 Transmit Buffer Empty The transmit buffer empty flag is set when PERIPH_TCR reaches zero, with PERIPH_TNCR also set to zero and the last data written to peripheral THR. This flag is reset by writing a non-zero value to PERIPH_TCR or PERIPH_TNCR. 494 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27.6 Peripheral DMA Controller (PDC) User Interface Table 27-2. Offset Register Mapping Register Name (1) Access Reset 0x00 Receive Pointer Register PERIPH _RPR Read/Write 0 0x04 Receive Counter Register PERIPH_RCR Read/Write 0 0x08 Transmit Pointer Register PERIPH_TPR Read/Write 0 0x0C Transmit Counter Register PERIPH_TCR Read/Write 0 0x10 Receive Next Pointer Register PERIPH_RNPR Read/Write 0 0x14 Receive Next Counter Register PERIPH_RNCR Read/Write 0 0x18 Transmit Next Pointer Register PERIPH_TNPR Read/Write 0 0x1C Transmit Next Counter Register PERIPH_TNCR Read/Write 0 0x20 Transfer Control Register PERIPH_PTCR Write-only - 0x24 Transfer Status Register PERIPH_PTSR Read-only 0 Note: 1. PERIPH: Ten registers are mapped in the peripheral memory space at the same offset. These can be defined by the user depending on the function and the desired peripheral. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 495 27.6.1 Receive Pointer Register Name: PERIPH_RPR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RXPTR 23 22 21 20 RXPTR 15 14 13 12 RXPTR 7 6 5 4 RXPTR * RXPTR: Receive Pointer Register RXPTR must be set to receive buffer address. When a half-duplex peripheral is connected to the PDC, RXPTR = TXPTR. 496 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27.6.2 Receive Counter Register Name: PERIPH_RCR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 RXCTR 7 6 5 4 RXCTR * RXCTR: Receive Counter Register RXCTR must be set to receive buffer size. When a half-duplex peripheral is connected to the PDC, RXCTR = TXCTR. 0: Stops peripheral data transfer to the receiver. 1-65535: Starts peripheral data transfer if the corresponding channel is active. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 497 27.6.3 Transmit Pointer Register Name: PERIPH_TPR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 TXPTR 23 22 21 20 TXPTR 15 14 13 12 TXPTR 7 6 5 4 TXPTR * TXPTR: Transmit Counter Register TXPTR must be set to transmit buffer address. When a half-duplex peripheral is connected to the PDC, RXPTR = TXPTR. 498 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27.6.4 Transmit Counter Register Name: PERIPH_TCR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 TXCTR 7 6 5 4 TXCTR * TXCTR: Transmit Counter Register TXCTR must be set to transmit buffer size. When a half-duplex peripheral is connected to the PDC, RXCTR = TXCTR. 0: Stops peripheral data transfer to the transmitter. 1-65535: Starts peripheral data transfer if the corresponding channel is active. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 499 27.6.5 Receive Next Pointer Register Name: PERIPH_RNPR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RXNPTR 23 22 21 20 RXNPTR 15 14 13 12 RXNPTR 7 6 5 4 RXNPTR * RXNPTR: Receive Next Pointer RXNPTR contains the next receive buffer address. When a half-duplex peripheral is connected to the PDC, RXNPTR = TXNPTR. 500 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27.6.6 Receive Next Counter Register Name: PERIPH_RNCR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 RXNCTR 7 6 5 4 RXNCTR * RXNCTR: Receive Next Counter RXNCTR contains the next receive buffer size. When a half-duplex peripheral is connected to the PDC, RXNCTR = TXNCTR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 501 27.6.7 Transmit Next Pointer Register Name: PERIPH_TNPR Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 TXNPTR 23 22 21 20 TXNPTR 15 14 13 12 TXNPTR 7 6 5 4 TXNPTR * TXNPTR: Transmit Next Pointer TXNPTR contains the next transmit buffer address. When a half-duplex peripheral is connected to the PDC, RXNPTR = TXNPTR. 502 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27.6.8 Transmit Next Counter Register Name: PERIPH_TNCR Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 TXNCTR 7 6 5 4 TXNCTR * TXNCTR: Transmit Counter Next TXNCTR contains the next transmit buffer size. When a half-duplex peripheral is connected to the PDC, RXNCTR = TXNCTR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 503 27.6.9 Transfer Control Register Name: PERIPH_PTCR Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 TXTDIS 8 TXTEN 7 - 6 - 5 - 4 - 3 - 2 - 1 RXTDIS 0 RXTEN * RXTEN: Receiver Transfer Enable 0: No effect. 1: Enables PDC receiver channel requests if RXTDIS is not set. When a half-duplex peripheral is connected to the PDC, enabling the receiver channel requests automatically disables the transmitter channel requests. It is forbidden to set both TXTEN and RXTEN for a half-duplex peripheral. * RXTDIS: Receiver Transfer Disable 0: No effect. 1: Disables the PDC receiver channel requests. When a half-duplex peripheral is connected to the PDC, disabling the receiver channel requests also disables the transmitter channel requests. * TXTEN: Transmitter Transfer Enable 0: No effect. 1: Enables the PDC transmitter channel requests. When a half-duplex peripheral is connected to the PDC, it enables the transmitter channel requests only if RXTEN is not set. It is forbidden to set both TXTEN and RXTEN for a half-duplex peripheral. * TXTDIS: Transmitter Transfer Disable 0: No effect. 1: Disables the PDC transmitter channel requests. When a half-duplex peripheral is connected to the PDC, disabling the transmitter channel requests disables the receiver channel requests. 504 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 27.6.10 Transfer Status Register Name: PERIPH_PTSR Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 TXTEN 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 RXTEN * RXTEN: Receiver Transfer Enable 0: PDC receiver channel requests are disabled. 1: PDC receiver channel requests are enabled. * TXTEN: Transmitter Transfer Enable 0: PDC transmitter channel requests are disabled. 1: PDC transmitter channel requests are enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 505 28. Clock Generator 28.1 Description The Clock Generator user interface is embedded within the Power Management Controller and is described in Section 29.17 "Power Management Controller (PMC) User Interface". However, the Clock Generator registers are named CKGR_. 28.2 Embedded Characteristics The Clock Generator is made up of: A low-power 32768 Hz slow clock oscillator with Bypass mode A low-power RC oscillator A 3 to 20 MHz crystal or ceramic resonator-based oscillator, which can be bypassed. A factory-programmed fast RC oscillator. Three output frequencies can be selected: 4/8/12 MHz. By default 4 MHz is selected. Two 80 to 240 MHz programmable PLL (input from 3 to 32 MHz), capable of providing the clock MCK to the processor and to the peripherals. It provides the following clocks: 506 SLCK, the slow clock, which is the only permanent clock within the system. MAINCK is the output of the main clock oscillator selection: either the crystal or ceramic resonator-based oscillator or 4/8/12 MHz fast RC oscillator. PLLACK is the output of the divider and 80 to 240 MHz programmable PLL (PLLA). PLLBCK is the output of the divider and 80 to 240 MHz programmable PLL (PLLB). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28.3 Block Diagram Figure 28-1. Clock Generator Block Diagram Clock Generator XTALSEL (Supply Controller) Embedded 32 kHz RC Oscillator 0 Slow Clock SLCK XIN32 XOUT32 32768 Hz Crystal Oscillator 1 CKGR_MOR MOSCSEL Embedded 4/8/12 MHz Fast RC Oscillator 0 Main Clock XIN XOUT MAINCK 3-20 MHz Crystal or Ceramic Resonator Oscillator 1 PLLA and Divider /2 PLLA Clock PLLACK PLLADIV2 PMC_MCKR PLLB and Divider /2 PLLB Clock PLLBCK PLLBDIV2 PMC_MCKR Status Control Power Management Controller SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 507 28.4 Slow Clock The Supply Controller embeds a slow clock generator that is supplied with the VDDIO power supply. As soon as VDDIO is supplied, both the crystal oscillator and the embedded RC oscillator are powered up, but only the embedded RC oscillator is enabled. This allows the slow clock to be valid in a short time (about 100 s). The slow clock is generated either by the slow clock crystal oscillator or by the slow clock RC oscillator. The selection between the RC or the crystal oscillator is made by writing the XTALSEL bit in the Supply Controller Control Register (SUPC_CR). 28.4.1 Slow Clock RC Oscillator By default, the slow clock RC oscillator is enabled and selected. The user has to take into account the possible drifts of the RC oscillator. More details are given in the section "DC Characteristics" of the product datasheet. It can be disabled via the XTALSEL bit in SUPC_CR. 28.4.2 Slow Clock Crystal Oscillator The Clock Generator integrates a 32768 Hz low-power oscillator. To use this oscillator, the XIN32 and XOUT32 pins must be connected to a 32768 Hz crystal. Two external capacitors must be wired as shown in Figure 28-2. More details are given in the section "DC Characteristics" of the product datasheet. Note that the user is not obliged to use the slow clock crystal and can use the RC oscillator instead. Figure 28-2. Typical Slow Clock Crystal Oscillator Connection XIN32 XOUT32 GND 32768 Hz Crystal The user can select the crystal oscillator to be the source of the slow clock, as it provides a more accurate frequency. The command is made by writing a 1 to the SUPC_CR.XTALSEL bit. This results in a sequence which first configures the PIO lines multiplexed with XIN32 and XOUT32 to be driven by the oscillator, then enables the crystal oscillator and then disables the RC oscillator to save power. The switch of the slow clock source is glitch free. The OSCSEL bit of the Supply Controller Status Register (SUPC_SR) or the OSCSEL bit of the PMC Status Register (PMC_SR) tracks the oscillator frequency downstream. It must be read in order to be informed when the switch sequence, initiated when a new value is written in the SUPC_CR.XTALSEL bit, is done. Coming back on the RC oscillator is only possible by shutting down the VDDIO power supply. If the user does not need the crystal oscillator, the XIN32 and XOUT32 pins can be left unconnected since by default the XIN32 and XOUT32 system I/O pins are in PIO input mode with pull-up after reset. The user can also set the crystal oscillator in Bypass mode instead of connecting a crystal. In this case, the user has to provide the external clock signal on XIN32. The input characteristics of the XIN32 pin are given in the product electrical characteristics section. In order to set the Bypass mode, the OSCBYPASS bit of the Supply Controller Mode Register (SUPC_MR) needs to be set at 1 prior to writing a 1 in bit XTALSEL. 508 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28.5 Main Clock Figure 28-3 shows the main clock block diagram. Figure 28-3. Main Clock Block Diagram CKGR_MOR MOSCRCEN CKGR_MOR MOSCRCF PMC_SR MOSCRCS Fast RC Oscillator CKGR_MOR PMC_SR MOSCSEL MOSCSELS 0 CKGR_MOR MAINCK Main Clock MOSCXTEN 1 3-20 MHz Crystal or Ceramic Resonator Oscillator XIN XOUT CKGR_MOR MOSCXTST PMC_SR 3-20 MHz Oscillator Counter SLCK Slow Clock MOSCXTS CKGR_MOR MOSCRCEN CKGR_MOR CKGR_MCFR MOSCXTEN RCMEAS CKGR_MOR MOSCSEL CKGR_MCFR MAINCK Main Clock Ref. MAINF Main Clock Frequency Counter CKGR_MCFR MAINFRDY The main clock has two sources: 4/8/12 MHz fast RC oscillator which starts very quickly and is used at startup. 3 to 20 MHz crystal or ceramic resonator-based oscillator which can be bypassed (Refer to Section 28.5.5 "Bypassing the Main Crystal Oscillator"). 28.5.1 Fast RC Oscillator After reset, the 4/8/12 MHz fast RC oscillator is enabled with the 4 MHz frequency selected and it is selected as the source of MAINCK. MAINCK is the default clock selected to start the system. The fast RC oscillator frequencies are calibrated in production except the lowest frequency which is not calibrated. Refer to the "DC Characteristics" section of the product datasheet. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 509 The software can disable or enable the 4/8/12 MHz fast RC oscillator with the MOSCRCEN bit in the Clock Generator Main Oscillator Register (CKGR_MOR). The user can also select the output frequency of the fast RC oscillator, either 4/8/12 MHz are available. It can be done through MOSCRCF bits in CKGR_MOR. When changing this frequency selection, the MOSCRCS bit in the Power Management Controller Status Register (PMC_SR) is automatically cleared and MAINCK is stopped until the oscillator is stabilized. Once the oscillator is stabilized, MAINCK restarts and MOSCRCS is set. When disabling the main clock by clearing the MOSCRCEN bit in CKGR_MOR, the MOSCRCS bit in PMC_SR is automatically cleared, indicating the main clock is off. Setting the MOSCRCS bit in the Power Management Controller Interrupt Enable Register (PMC_IER) can trigger an interrupt to the processor. When main clock (MAINCK) is not used to drive the processor and frequency monitor (SLCKis used instead), it is recommended to disable the main oscillators. The CAL4, CAL8 and CAL12 values in the PMC Oscillator Calibration Register (PMC_OCR) are the default values set by Atmel during production. These values are stored in a specific Flash memory area different from the main memory plane. These values cannot be modified by the user and cannot be erased by a Flash erase command or by the ERASE pin. Values written by the user's application in PMC_OCR are reset after each power up or peripheral reset. 28.5.2 Fast RC Oscillator Clock Frequency Adjustment It is possible for the user to adjust the main RC oscillator frequency through PMC_OCR. By default, SEL4/8/12 are low, so the RC oscillator will be driven with Flash calibration bits which are programmed during chip production. The user can adjust the trimming of the 4/8/12 MHz fast RC oscillator through this register in order to obtain more accurate frequency (to compensate derating factors such as temperature and voltage). In order to calibrate the oscillator lower frequency, SEL4 must be set to 1 and a good frequency value must be configured in CAL4. Likewise, SEL8/12 must be set to 1 and a trim value must be configured in CAL8/12 in order to adjust the other frequencies of the oscillator. It is possible to adjust the oscillator frequency while operating from this clock. For example, when running on lowest frequency it is possible to change the CAL4 value if SEL4 is set in PMC_OCR. It is possible to restart, at anytime, a measurement of the main frequency by means of the RCMEAS bit in Main Clock Frequency Register (CKGR_MCFR). Thus, when MAINFRDY flag reads 1, another read access on CKGR_MCFR provides an image of the frequency of the main clock on MAINF field. The software can calculate the error with an expected frequency and correct the CAL4 (or CAL8/CAL12) field accordingly. This may be used to compensate frequency drift due to derating factors such as temperature and/or voltage. 28.5.3 3 to 20 MHz Crystal or Ceramic Resonator-based Oscillator After reset, the 3 to 20 MHz crystal or ceramic resonator-based oscillator is disabled and it is not selected as the source of MAINCK. The user can select the 3 to 20 MHz crystal or ceramic resonator-based oscillator to be the source of MAINCK, as it provides a more accurate frequency. The software enables or disables the main oscillator in order to reduce power consumption by clearing the MOSCXTEN bit in CKGR_MOR. When disabling the main oscillator by clearing the MOSCXTEN bit in CKGR_MOR, the MOSCXTS bit in PMC_SR is automatically cleared, indicating the main clock is off. When enabling the main oscillator, the user must initiate the main oscillator counter with a value corresponding to the start-up time of the oscillator. This start-up time depends on the crystal frequency connected to the oscillator. When the MOSCXTEN bit and the MOSCXTST are written in CKGR_MOR to enable the main oscillator, the XIN and XOUT pins are automatically switched into Oscillator mode and MOSCXTS bit in PMC_SR is cleared and the 510 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 counter starts counting down on the slow clock divided by 8 from the MOSCXTST value. Since the MOSCXTST value is coded with 8 bits, the maximum start-up time is about 62 ms. When the counter reaches 0, the MOSCXTS bit is set, indicating that the main clock is valid. Setting the MOSCXTS bit in the Interrupt Mask Register (PMC_IMR) can trigger an interrupt to the processor. 28.5.4 Main Clock Oscillator Selection The user can select the source of the main clock from either the 4/8/12 MHz fast RC oscillator, the 3 to 20 MHz crystal oscillator or the ceramic resonator-based oscillator. The advantage of the 4/8/12 MHz fast RC oscillator is its fast start-up time. By default, this oscillator is selected to start the system and when entering Wait mode. The advantage of the 3 to 20 MHz crystal oscillator or ceramic resonator-based oscillator is the high level of accuracy provided. The selection of the oscillator is made by writing the MOSCSEL bit in CKGR_MOR. The switch of the main clock source is glitch-free, so there is no need to run out of SLCK, PLLACK in order to change the selection. The MOSCSELS bit of PMC_SR indicates when the switch sequence is done. Setting the MOSCSELS bit in PMC_IMR can trigger an interrupt to the processor. Enabling the fast RC oscillator (MOSCRCEN = 1) and changing the fast RC frequency (MOSCCRF) at the same time is not allowed. The fast RC must be enabled first and its frequency changed in a second step. 28.5.5 Bypassing the Main Crystal Oscillator Prior to bypassing the 3 to 20 MHz crystal oscillator, the external clock frequency provided on the XIN pin must be stable and within the values specified in the XIN Clock characteristics in the section "Electrical Characteristics". The sequence is as follows: 1. Make sure an external clock is connected on XIN. 2. Enable the bypass by writing a 1 to CKGR_MOR.MOSCXTBY. 3. Disable the 3 to 20 MHz oscillator by writing a 0 to bit CKGR_MOR.MOSCXTEN. 28.5.6 Switching Main Clock between the Main RC Oscillator and Fast Crystal Oscillator Both sources must be enabled during the switchover operation. Only after completion can the unused oscillator be disabled. If switching to fast crystal oscillator, the clock presence must first be checked according to what is described in Section 28.5.7 "Software Sequence to Detect the Presence of Fast Crystal" because the source may not be reliable (crystal failure or bypass on a non-existent clock). 28.5.7 Software Sequence to Detect the Presence of Fast Crystal The frequency meter carried on CKGR_MCFR is operating on the selected main clock and not on the fast crystal clock nor on the fast RC oscillator clock. Therefore, to check for the presence of the fast crystal clock, it is necessary to have the main clock (MAINCK) driven by the fast crystal clock (MOSCSEL = 1). The following software sequence order must be followed: 1. MCK must select the slow clock (CSS = 0 in the Master Clock Register (PMC_MCKR)). 2. Wait for the MCKRDY flag in PMC_SR to be 1. 3. The fast crystal must be enabled by programming 1 in the MOSCXTEN field in the CKGR_MOR with the MOSCXTST field being programmed to the appropriate value (see the "Electrical Characteristics" section). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 511 4. Wait for the MOSCXTS flag to be 1 in PMC_SR to get the end of a start-up period of the fast crystal oscillator. 5. Then, MOSCSEL must be programmed to 1 in CKGR_MOR to select fast main crystal oscillator for the main clock. 6. MOSCSEL must be read until its value equals 1. 7. Then the MOSCSELS status flag must be checked in PMC_SR. At this point, two cases may occur (either MOSCSELS = 0 or MOSCSELS = 1). If MOSCSELS = 1: There is a valid crystal connected and its frequency can be determined by initiating a frequency measure by programming RCMEAS in CKGR_MCFR. If MOSCSELS = 0: There is no fast crystal clock (either no crystal connected or a crystal clock out of specification). A frequency measure can reinforce this status by initiating a frequency measure by programming RCMEAS in CKGR_MCFR. If MOSCSELS = 0, the selection of the main clock must be programmed back to the main RC oscillator by writing MOSCSEL to 0 prior to disabling the fast crystal oscillator. If MOSCSELS = 0, the crystal oscillator can be disabled (MOSCXTEN = 0 in CKGR_MOR). 28.5.8 Main Clock Frequency Counter The device features a main clock frequency counter that provides the frequency of the main clock. The main clock frequency counter is reset and starts incrementing at the main clock speed after the next rising edge of the slow clock in the following cases: When the 4/8/12 MHz fast RC oscillator clock is selected as the source of main clock and when this oscillator becomes stable (i.e., when the MOSCRCS bit is set) When the 3 to 20 MHz crystal or ceramic resonator-based oscillator is selected as the source of main clock and when this oscillator becomes stable (i.e., when the MOSCXTS bit is set) When the main clock oscillator selection is modified When the RCMEAS bit of CKGR_MFCR is written to 1. Then, at the 16th falling edge of slow clock, the MAINFRDY bit in CKGR_MCFR) is set and the counter stops counting. Its value can be read in the MAINF field of CKGR_MCFR and gives the number of main clock cycles during 16 periods of slow clock, so that the frequency of the 4/8/12 MHz fast RC oscillator or 3 to 20 MHz crystal or ceramic resonator-based oscillator can be determined. 512 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 28.6 Divider and PLL Block The device features two divider blocks and two PLL blocks that permit a wide range of frequencies to be selected on either the master clock, the processor clock or the programmable clock outputs. A 48 MHz clock signal is provided to the embedded USB device port regardless of the frequency of the main clock. Figure 28-4 shows the block diagram of the divider and PLL blocks. Figure 28-4. Dividers and PLL Block Diagram MAINCK CKGR_PLLBR CKGR_PLLBR DIVB MULB Divider B PLL B PLLBCK PLLBDIV2 PMC_MCKR CKGR_PLLAR CKGR_PLLAR DIVA MULA Divider A PLL A PLLACK PLLADIV2 PMC_MCKR CKGR_PLLBR PLLBCOUNT PLL B Counter PMC_SR LOCKB CKGR_PLLAR PLLACOUNT PMC_SR SLCK PLL A Counter LOCKA 28.6.1 Divider and Phase Lock Loop Programming The divider can be set between 1 and 255 in steps of 1. When a divider field (DIV) is cleared, the output of the corresponding divider and the PLL output is a continuous signal at level 0. On reset, each DIV field is cleared, thus the corresponding PLL input clock is stuck at 0. The PLLs (PLLA, PLLB) allow multiplication of the divider's outputs. The PLL clock signal has a frequency that depends on the respective source signal frequency and on the parameters DIV (DIVA, DIVB) and MUL (MULA, MULB) . The factor applied to the source signal frequency is (MUL + 1)/DIV. When MUL is written to 0 or DIV = 0, the PLL is disabled and its power consumption is saved. Note that there is a delay of two SLCK clock cycles between the disable command and the real disable of the PLL. Re-enabling the PLL can be performed by writing a value higher than 0 in the MUL field and DIV higher than 0. Whenever the PLL is re-enabled or one of its parameters is changed, the LOCK (LOCKA, LOCKB) bit in PMC_SR is automatically cleared. The values written in the PLLCOUNT field (PLLACOUNT, PLLBCOUNT) in CKGR_PLLR (CKGR_PLLAR, CKGR_PLLBR) are loaded in the PLL counter. The PLL counter then decrements at the speed of SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 513 the slow clock until it reaches 0. At this time, the LOCK bit is set in PMC_SR and can trigger an interrupt to the processor. The user has to load the number of slow clock cycles required to cover the PLL transient time into the PLLCOUNT field. The PLL clock can be divided by 2 by writing the PLLDIV2 (PLLADIV2, PLLBDIV2) bit in PMC_MCKR. It is prohibited to change the 4/8/12 MHz fast RC oscillator or the main oscillator selection in CKGR_MOR while the master clock source is the PLL and the PLL reference clock is the fast RC oscillator. The user must: 1. Switch on the main RC oscillator by writing a 1 to the CSS field of PMC_MCKR. 514 2. Change the frequency (MOSCRCF) or oscillator selection (MOSCSEL) in CKGR_MOR. 3. Wait for MOSCRCS (if frequency changes) or MOSCSELS (if oscillator selection changes) in PMC_SR. 4. Disable and then enable the PLL. 5. Wait for the LOCK flag in PMC_SR. 6. Switch back to the PLL by writing the appropriate value to the CSS field of PMC_MCKR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29. Power Management Controller (PMC) 29.1 Description The Power Management Controller (PMC) optimizes power consumption by controlling all system and user peripheral clocks. The PMC enables/disables the clock inputs to many of the peripherals and the Cortex-M4 processor. The Supply Controller selects between the 32 kHz RC oscillator or the slow crystal oscillator. The unused oscillator is disabled automatically so that power consumption is optimized. By default, at startup, the chip runs out of the master clock using the fast RC oscillator running at 4 MHz. The user can trim the 8 and 12 MHz RC oscillator frequencies by software. 29.2 Embedded Characteristics The PMC provides the following clocks: MCK, the Master Clock, programmable from a few hundred Hz to the maximum operating frequency of the device. It is available to the modules running permanently, such as the Enhanced Embedded Flash Controller. Processor Clock (HCLK) , automatically switched off when entering the processor in Sleep Mode Free-running processor Clock (FCLK) The Cortex-M4 SysTick external clock UDP Clock (UDPCK), required by USB Device Port operations Peripheral Clocks, provided to the embedded peripherals (USART, SPI, TWI, TC, etc.) and independently controllable. Programmable Clock Outputs (PCKx), selected from the clock generator outputs to drive the device PCK pins The PMC also provides the following operations on clocks: A main crystal oscillator clock failure detector A frequency counter on main clock and an on-the-fly adjustable main RC oscillator frequency SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 515 29.3 Block Diagram Figure 29-1. General Clock Block Diagram Clock Generator Processor Clock Controller XTALSEL (Supply Controller) Sleep Mode Embedded 32 kHz RC Oscillator Divider /8 Slow Clock 32768 Hz Crystal Oscillator Master Clock Controller (PMC_MCKR) SLCK 1 CKGR_MOR Embedded 4/8/12 MHz Fast RC Oscillator XOUT Free Running Clock FCLK MAINCK Prescaler /1, /2, /3, /4, /8, /16, /32, /64 PLLBCK MOSCSEL XIN SysTick PLLACK Peripherals Clock Controller (PMC_PCERx) 0 PRES CSS Master Clock MCK ON/OFF Main Clock MAINCK 3-20 MHz Crystal or Ceramic Resonator Oscillator periph_clk[..] 1 SLCK Programmable Clock Controller (PMC_PCKx) MAINCK PLLA and Divider /2 Prescaler /1, /2, /4, /8, /16, /32, /64 PLLBCK PLLA Clock PLLACK PLLACK MCK PLLADIV2 CSS PRES PMC_MCKR PLLB and Divider /2 PLLBDIV2 PLLB Clock PLLBCK USB Clock Controller (PMC_USB) PLLACK Divider /1, /2, /3,... /16 PLLBCK ON/OFF (PMC_SCER/SCDR) XOUT32 int 0 SLCK XIN32 Processor clock HCLK ON/OFF pck[..] USB Clock UDPCK PMC_MCKR USBS Status USBDIV Control Power Management Controller 29.4 Master Clock Controller The Master Clock Controller provides selection and division of the master clock (MCK). MCK is the source clockof the peripheral clocks. The master clock is selected from one of the clocks provided by the Clock Generator. Selecting the slow clock provides a slow clock signal to the whole device. Selecting the main clock saves power consumption of the PLLs. The Master Clock Controller is made up of a clock selector and a prescaler. The master clock selection is made by writing the CSS field (Clock Source Selection) in PMC_MCKR. The prescaler supports the division by a power of 2 of the selected clock between 1 and 64, and the division by 3. The PRES field in PMC_MCKR programs the prescaler. Each time PMC_MCKR is written to define a new master clock, the MCKRDY bit is cleared in PMC_SR. It reads 0 until the master clock is established. Then, the MCKRDY bit is set and can trigger an interrupt to the processor. This feature is useful when switching from a high-speed clock to a lower one to inform the software when the change is actually done. 516 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 29-2. Master Clock Controller PMC_MCKR PMC_MCKR CSS PRES SLCK MAINCK Master Clock Prescaler PLLACK To the MCK Divider PLLBCK To the Processor Clock Controller (PCK) 29.5 Processor Clock Controller The PMC features a Processor Clock Controller (HCLK) that implements the processor Sleep mode. These processor clock can be disabled by executing the WFI (WaitForInterrupt) or the WFE (WaitForEvent) processor instruction while the LPM bit is at 0 in the PMC Fast Startup Mode Register (PMC_FSMR). The Processor Clock Controller HCLK is enabled after a reset and is automatically re-enabled by any enabled interrupt. The processor Sleep mode is entered by disabling the processor clock, which is automatically re-enabled by any enabled fast or normal interrupt, or by the reset of the product. When processor Sleep mode is entered, the current instruction is finished before the clock is stopped, but this does not prevent data transfers from other masters of the system bus. 29.6 SysTick Clock The SysTick calibration value is fixed to 12500 which allows the generation of a time base of 1 ms with SysTick clock to the maximum frequency on MCK divided by 8. 29.7 USB Clock Controller The user can select the PLLA or the PLLB output as the USB source clock by writing the USBS bit in PMC_USB. If using the USB, the user must program the PLL to generate an appropriate frequency depending on the USBDIV bit in the USB Clock Register (PMC_USB). When the PLL output is stable, i.e., the LOCK bit is set, the USB device FS clock can be enabled by setting the UDP bit in the System Clock Enable Register (PMC_SCER). To save power on this peripheral when it is not used, the user can set the UDP bit in the System Clock Disable Register (PMC_SCDR). The UDP bit in the System Clock Status Register (PMC_SCSR) gives the activity of this clock. The USB device port requires both the 48 MHz signal and the peripheral clock. The USB peripheral clock may be controlled by means of the Master Clock Controller. Figure 29-3. USB Clock Controller PMC_USB USBDIV USB Source Clock PMC_SCER, PMC_SDER Divider /1,/2,/3,.../16 UDP Clock (UDPCK) UDP SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 517 29.8 Peripheral Clock Controller The PMC controls the clocks of each embedded peripheral by means of the Peripheral Clock Controller. The user can individually enable and disable the clock on the peripherals. The user can also enable and disable these clocks by writing Peripheral Clock Enable 0 (PMC_PCER0), Peripheral Clock Disable 0 (PMC_PCDR0), Peripheral Clock Enable 1 (PMC_PCER1) and Peripheral Clock Disable 1 (PMC_PCDR1) registers. The status of the peripheral clock activity can be read in the Peripheral Clock Status Register (PMC_PCSR0) and Peripheral Clock Status Register (PMC_PCSR1). When a peripheral clock is disabled, the clock is immediately stopped. The peripheral clocks are automatically disabled after a reset. To stop a peripheral, it is recommended that the system software wait until the peripheral has executed its last programmed operation before disabling the clock. This is to avoid data corruption or erroneous behavior of the system. The bit number within the Peripheral Clock Control registers (PMC_PCER0-1, PMC_PCDR0-1, and PMC_PCSR0-1) is the Peripheral Identifier defined at the product level. The bit number corresponds to the interrupt source number assigned to the peripheral. 29.9 Free-Running Processor Clock The free-running processor clock (FCLK)used for sampling interrupts and clocking debug blocks ensures that interrupts can be sampled, and sleep events can be traced, while the processor is sleeping. It is connected to master clock (MCK). 29.10 Programmable Clock Output Controller The PMC controls three signals to be output on external pins, PCKx. Each signal can be independently programmed via the Programmable Clock Registers (PMC_PCKx). PCKx can be independently selected between the slow clock (SLCK), the main clock (MAINCK), the PLLA clock (PLLACK), the PLLB clock (PLLBCK),and the master clock (MCK) by writing the CSS field in PMC_PCKx. Each output signal can also be divided by a power of 2 between 1 and 64 by writing the PRES (Prescaler) field in PMC_PCKx. Each output signal can be enabled and disabled by writing a 1 to the corresponding PCKx bit of PMC_SCER and PMC_SCDR, respectively. Status of the active programmable output clocks are given in the PCKx bits of PMC_SCSR. The PCKRDYx status flag in PMC_SR indicates that the programmable clock is actually what has been programmed in the programmable clock registers. As the Programmable Clock Controller does not manage with glitch prevention when switching clocks, it is strongly recommended to disable the programmable clock before any configuration change and to re-enable it after the change is actually performed. 29.11 Fast Startup At exit from Wait mode, the device allows the processor to restart in less than 10 microseconds only if the C-code function that manages the Wait mode entry and exit is linked to and executed from on-chip SRAM. The fast startup time cannot be achieved if the first instruction after an exit is located in the embedded Flash. If fast startup is not required, or if the first instruction after a Wait mode exit is located in embedded Flash, see Section 29.12 "Startup from Embedded Flash". 518 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Prior to instructing the device to enter Wait mode: 1. Select the fast RC oscillator as the master clock source (the CSS field in PMC_MCKR must be written to 1). 2. Disable the PLL if enabled. 3. Clear the internal wake-up sources. The system enters Wait mode either by setting the WAITMODE bit in CKGR_MOR, or by executing the WaitForEvent (WFE) instruction of the processor while the LPM bit is at 1 in PMC_FSMR. Immediately after setting the WAITMODE bit or using the WFE instruction, wait for the MCKRDY bit to be set in PMC_SR. A fast startup is enabled upon the detection of a programmed level on one of the 16 wake-up inputs (WKUP) or upon an active alarm from the RTC, RTT and USB Controller. The polarity of the 16 wake-up inputs is programmable by writing the PMC Fast Startup Polarity Register (PMC_FSPR). The fast startup circuitry, as shown in Figure 29-4, is fully asynchronous and provides a fast startup signal to the PMC. As soon as the fast startup signal is asserted, the embedded 4/8/12 MHz fast RC oscillator restarts automatically. When entering Wait mode, the embedded Flash can be placed in one of the Low-power modes (Deep-powerdown or Standby modes) depending on the configuration of the FLPM field in the PMC_FSMR. The FLPM field can be programmed at anytime and its value will be applied to the next Wait mode period. The power consumption reduction is optimal when configuring 1 (Deep-power-down mode) in field FLPM. If 0 is programmed (Standby mode), the power consumption is slightly higher than in Deep-power-down mode. When programming 2 in field FLPM, the Wait mode Flash power consumption is equivalent to that of the Active mode when there is no read access on the Flash. Figure 29-4. Fast Startup Circuitry FSTT0 WKUP0 FSTP0 FSTT1 WKUP1 FSTP1 FSTT15 WKUP15 fast_restart FSTP15 RTTAL RTT Alarm RTCAL RTC Alarm USBAL USB Alarm SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 519 Each wake-up input pin and alarm can be enabled to generate a fast startup event by setting the corresponding bit in PMC_FSMR. The user interface does not provide any status for fast startup, but the user can easily recover this information by reading the PIO Controller and the status registers of the RTC, RTT and USB Controller. 29.12 Startup from Embedded Flash The inherent start-up time of the embedded Flash cannot provide a fast startup of the system. If system fast start-up time is not required, the first instruction after a Wait mode exit can be located in the embedded Flash. Under these conditions, prior to entering Wait mode, the Flash controller must be programmed to perform access in 0 wait-state (see Flash controller section). The procedure and conditions to enter Wait mode and the circuitry to exit Wait mode are strictly the same as fast startup (see Section 29.11 "Fast Startup"). 29.13 Main Clock Failure Detector The clock failure detector monitors the main crystal oscillator or ceramic resonator-based oscillator to identify an eventual failure of this oscillator. The clock failure detector can be enabled or disabled by bit CFDEN in CKGR_MOR. After a VDDCORE reset, the detector is disabled. However, if the oscillator is disabled (MOSCXTEN = 0), the detector is disabled too. The clock failure detection must be enabled only when system clock MCK selects the fast RC oscillator. PMC_SR must be read two slow clock cycles after enabling the clock failure detector. Then, MCK can select another clock source by programming the CSS field in PMC_MCKR. A failure is detected by means of a counter incrementing on the main oscillator clock edge and detection logic is triggered by the slow RC Oscillator clock. The slow RC is automatically enabled when CFDEN=1. The counter is cleared when the slow RC oscillator clock signal is low and enabled when the signal is high. Thus, the failure detection time is one slow RC oscillator period. If, during the high level period of the slow RC oscillator clock signal, less than eight fast crystal oscillator clock periods have been counted, then a failure is reported. If a failure of the main oscillator is detected, bit CFDEV in PMC_SR indicates a failure event and generates an interrupt if the corresponding interrupt source is enabled. The interrupt remains active until a read occurs in PMC_SR. The user can know the status of the clock failure detection at any time by reading the CFDS bit in PMC_SR. Figure 29-5. Clock Failure Detection (Example) Main Crytal Clock SLCK CDFEV Read PMC_SR CDFS Note: ratio of clock periods is for illustration purposes only If the main oscillator is selected as the source clock of MAINCK (MOSCSEL in CKGR_MOR = 1), and if the master clock source is PLLACK or PLLBCK (CSS = 2 or 3), a clock failure detection automatically forces MAINCK to be the source clock for the master clock (MCK). Then, regardless of the PMC configuration, a clock failure detection 520 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 automatically forces the fast RC oscillator to be the source clock for MAINCK. If the fast RC oscillator is disabled when a clock failure detection occurs, it is automatically re-enabled by the clock failure detection mechanism. It takes two slow RC oscillator clock cycles to detect and switch from the main oscillator, to the fast RC oscillator if the source master clock (MCK) is main clock (MAINCK), or three slow clock RC oscillator cycles if the source of MCK is PLLACKor PLLBCK. A clock failure detection activates a fault output that is connected to the Pulse Width Modulator (PWM) Controller. With this connection, the PWM controller is able to force its outputs and to protect the driven device, if a clock failure is detected. The user can know the status of the clock failure detector at any time by reading the FOS bit in PMC_SR. This fault output remains active until the defect is detected and until it is cleared by the bit FOCLR in the PMC Fault Output Clear Register (PMC_FOCR). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 521 29.14 Programming Sequence 1. If the fast crystal oscillator is not required, the PLL and divider can be directly configured (Step 6.) else the fast crystal oscillator must be started (Step 2.). 2. Enable the fast crystal oscillator: The fast crystal oscillator is enabled by setting the MOSCXTEN field in CKGR_MOR. The user can define a start-up time. This can be achieved by writing a value in the MOSCXTST field in CKGR_MOR. Once this register has been correctly configured, the user must wait for MOSCXTS field in PMC_SR to be set. This can be done either by polling MOSCXTS in PMC_SR, or by waiting for the interrupt line to be raised if the associated interrupt source (MOSCXTS) has been enabled in PMC_IER. 3. Switch the MAINCK to the main crystal oscillator by setting MOSCSEL in CKGR_MOR. 4. Wait for the MOSCSELS to be set in PMC_SR to ensure the switchover is complete. 5. Check the main clock frequency: This main clock frequency can be measured via CKGR_MCFR. Read CKGR_MCFR until the MAINFRDY field is set, after which the user can read the MAINF field in CKGR_MCFR by performing an additional read. This provides the number of main clock cycles that have been counted during a period of 16 slow clock cycles. If MAINF = 0, switch the MAINCK to the Fast RC Oscillator by clearing MOSCSEL in CKGR_MOR. If MAINF 0, proceed to Step 6. 6. Set PLLx and Divider (if not required, proceed to Step 7.): In the names PLLx, DIVx, MULx, LOCKx, PLLxCOUNT, and CKGR_PLLxR, `x' represents A or B. All parameters needed to configure PLLx and the divider are located in CKGR_PLLxR. The DIVx field is used to control the divider itself. This parameter can be programmed between 0 and 127. Divider output is divider input divided by DIVx parameter. By default, DIVx field is cleared which means that the divider and PLLx are turned off. The MULx field is the PLLx multiplier factor. This parameter can be programmed between 0 and 62. If MULx is cleared, PLLx will be turned off, otherwise the PLLx output frequency is PLLx input frequency multiplied by (MULx + 1). The PLLxCOUNT field specifies the number of slow clock cycles before the LOCKx bit is set in the PMC_SR after CKGR_PLLxR has been written. Once CKGR_PLLxR has been written, the user must wait for the LOCKx bit to be set in the PMC_SR. This can be done either by polling LOCKx in PMC_SR or by waiting for the interrupt line to be raised if the associated interrupt source (LOCKx) has been enabled in PMC_IER. All fields in CKGR_PLLxR can be programmed in a single write operation. If at some stage one of the following parameters, MULx or DIVx is modified, the LOCKx bit goes low to indicate that PLLx is not yet ready. When PLLx is locked, LOCKx is set again. The user must wait for the LOCKx bit to be set before using the PLLx output clock. 7. Select the master clock and processor clock The master clock and the processor clock are configurable via PMC_MCKR. The CSS field is used to select the clock source of the master clock and processor clock dividers. By default, the selected clock source is the main clock. The PRES field is used to define the processor clock and master clock prescaler. The user can choose between different values (1, 2, 3, 4, 8, 16, 32, 64). Prescaler output is the selected clock source frequency divided by the PRES value. Once the PMC_MCKR has been written, the user must wait for the MCKRDY bit to be set in the PMC_SR. This can be done either by polling MCKRDY in PMC_SR or by waiting for the interrupt line to be raised if the 522 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 associated interrupt source (MCKRDY) has been enabled in PMC_IER. PMC_MCKR must not be programmed in a single write operation. The programming sequence for PMC_MCKR is as follows: If a new value for CSS field corresponds to PLL clock, Program the PRES field in PMC_MCKR. Wait for the MCKRDY bit to be set in PMC_SR. Program the CSS field in PMC_MCKR. Wait for the MCKRDY bit to be set in PMC_SR. If a new value for CSS field corresponds to main clock or slow clock, Program the CSS field in PMC_MCKR. Wait for the MCKRDY bit to be set in the PMC_SR. Program the PRES field in PMC_MCKR. Wait for the MCKRDY bit to be set in PMC_SR. If at some stage, parameters CSS or PRES are modified, the MCKRDY bit goes low to indicate that the master clock and the processor clock are not yet ready. The user must wait for MCKRDY bit to be set again before using the master and processor clocks. Note: IF PLLx clock was selected as the master clock and the user decides to modify it by writing in CKGR_PLLxR, the MCKRDY flag will go low while PLLx is unlocked. Once PLLx is locked again, LOCKx goes high and MCKRDY is set. While PLLx is unlocked, the master clock selection is automatically changed to slow clock for PLLA and main clock for PLLB. For further information, see Section 29.15.2 "Clock Switching Waveforms". Code Example: write_register(PMC_MCKR,0x00000001) wait (MCKRDY=1) write_register(PMC_MCKR,0x00000011) wait (MCKRDY=1) The master clock is main clock divided by 2. 8. Select the programmable clocks Programmable clocks are controlled via registers, PMC_SCER, PMC_SCDR and PMC_SCSR. Programmable clocks can be enabled and/or disabled via PMC_SCER and PMC_SCDR. Three programmable clocks can be used. PMC_SCSR indicates which programmable clock is enabled. By default all programmable clocks are disabled. PMC_PCKx registers are used to configure programmable clocks. The CSS field is used to select the programmable clock divider source. Several clock options are available: main clock, slow clock, master clock, PLLACK, PLLBCK. The slow clock is the default clock source. The PRES field is used to control the programmable clock prescaler. It is possible to choose between different values (1, 2, 4, 8, 16, 32, 64). Programmable clock output is prescaler input divided by PRES parameter. By default, the PRES value is cleared which means that PCKx is equal to slow clock. Once PMC_PCKx register has been configured, the corresponding programmable clock must be enabled and the user is constrained to wait for the PCKRDYx bit to be set in the PMC_SR. This can be done either by polling PCKRDYx in PMC_SR or by waiting for the interrupt line to be raised if the associated interrupt source (PCKRDYx) has been enabled in PMC_IER. All parameters in PMC_PCKx can be programmed in a single write operation. If the CSS and PRES parameters are to be modified, the corresponding programmable clock must be disabled first. The parameters can then be modified. Once this has been done, the user must re-enable the programmable clock and wait for the PCKRDYx bit to be set. 9. Enable the peripheral clocks SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 523 Once all of the previous steps have been completed, the peripheral clocks can be enabled and/or disabled via registers PMC_PCER0, PMC_PCER, PMC_PCDR0 and PMC_PCDR. 524 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.15 Clock Switching Details 29.15.1 Master Clock Switching Timings Table 29-1 and Table 29-2 give the worst case timings required for the master clock to switch from one selected clock to another one. This is in the event that the prescaler is de-activated. When the prescaler is activated, an additional time of 64 clock cycles of the newly selected clock has to be added. Table 29-1. Clock Switching Timings (Worst Case) From Main Clock SLCK PLL Clock - 4 x SLCK + 2.5 x Main Clock 0.5 x Main Clock + 4.5 x SLCK - 3 x PLL Clock + 5 x SLCK 0.5 x Main Clock + 4 x SLCK + PLLCOUNT x SLCK + 2.5 x PLLx Clock 2.5 x PLL Clock + 5 x SLCK + PLLCOUNT x SLCK 2.5 x PLL Clock + 4 x SLCK + PLLCOUNT x SLCK To Main Clock SLCK PLL Clock Notes: 1. 2. Table 29-2. 3 x PLL Clock + 4 x SLCK + 1 x Main Clock PLL designates either the PLLA or the PLLB Clock. PLLCOUNT designates either PLLACOUNT or PLLBCOUNT. Clock Switching Timings between Two PLLs (Worst Case) From PLLA Clock PLLB Clock PLLA Clock 2.5 x PLLA Clock + 4 x SLCK + PLLACOUNT x SLCK 3 x PLLA Clock + 4 x SLCK + 1.5 x PLLA Clock PLLB Clock 3 x PLLB Clock + 4 x SLCK + 1.5 x PLLB Clock 2.5 x PLLB Clock + 4 x SLCK + PLLBCOUNT x SLCK To SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 525 29.15.2 Clock Switching Waveforms Figure 29-6. Switch Master Clock from Slow Clock to PLLx Clock Slow Clock PLLx Clock LOCK MCKRDY Master Clock Write PMC_MCKR Figure 29-7. Switch Master Clock from Main Clock to Slow Clock Slow Clock Main Clock MCKRDY Master Clock Write PMC_MCKR 526 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 29-8. Change PLLx Programming Slow Clock PLLx Clock LOCKx MCKRDY Master Clock Slow Clock Write CKGR_PLLxR Figure 29-9. Programmable Clock Output Programming PLLx Clock PCKRDY PCKx Output Write PMC_PCKx Write PMC_SCER Write PMC_SCDR PLL Clock is selected PCKx is enabled PCKx is disabled SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 527 29.16 Register Write Protection To prevent any single software error from corrupting PMC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the PMC Write Protection Mode Register (PMC_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the PMC Write Protection Status Register (PMC_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading the PMC_WPSR. The following registers can be write-protected: 528 PMC System Clock Enable Register PMC System Clock Disable Register PMC Peripheral Clock Enable Register 0 PMC Peripheral Clock Disable Register 0 PMC Clock Generator Main Oscillator Register PMC Clock Generator PLLA Register PMC Clock Generator PLLB Register PMC Master Clock Register PMC USB Clock Register PMC Programmable Clock Register PMC Fast Startup Mode Register PMC Fast Startup Polarity Register PMC Peripheral Clock Enable Register 1 PMC Peripheral Clock Disable Register 1 PMC Oscillator Calibration Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17 Power Management Controller (PMC) User Interface Table 29-3. Register Mapping Offset Register Name Access Reset 0x0000 System Clock Enable Register PMC_SCER Write-only - 0x0004 System Clock Disable Register PMC_SCDR Write-only - 0x0008 System Clock Status Register PMC_SCSR Read-only 0x0000_0001 0x000C Reserved - - 0x0010 Peripheral Clock Enable Register 0 PMC_PCER0 Write-only - 0x0014 Peripheral Clock Disable Register 0 PMC_PCDR0 Write-only - 0x0018 Peripheral Clock Status Register 0 PMC_PCSR0 Read-only 0x0000_0000 0x001C Reserved - - 0x0020 Main Oscillator Register CKGR_MOR Read/Write 0x0000_0008 0x0024 Main Clock Frequency Register CKGR_MCFR Read/Write 0x0000_0000 0x0028 PLLA Register CKGR_PLLAR Read/Write 0x0000_3F00 0x002C PLLB Register CKGR_PLLBR Read/Write 0x0000_3F00 0x0030 Master Clock Register PMC_MCKR Read/Write 0x0000_0001 0x0034 Reserved - - 0x0038 USB Clock Register Read/Write 0x0000_0000 0x003C Reserved - - 0x0040 Programmable Clock 0 Register PMC_PCK0 Read/Write 0x0000_0000 0x0044 Programmable Clock 1 Register PMC_PCK1 Read/Write 0x0000_0000 0x0048 Programmable Clock 2 Register PMC_PCK2 Read/Write 0x0000_0000 - - 0x004C- 0x005C - - - PMC_USB - Reserved - 0x0060 Interrupt Enable Register PMC_IER Write-only - 0x0064 Interrupt Disable Register PMC_IDR Write-only - 0x0068 Status Register PMC_SR Read-only 0x0003_0008 0x006C Interrupt Mask Register PMC_IMR Read-only 0x0000_0000 0x0070 Fast Startup Mode Register PMC_FSMR Read/Write 0x0000_0000 0x0074 Fast Startup Polarity Register PMC_FSPR Read/Write 0x0000_0000 0x0078 Fault Output Clear Register PMC_FOCR Write-only - - - 0x007C-0x00E0 Reserved - 0x00E4 Write Protection Mode Register PMC_WPMR Read/Write 0x0000_0000 0x00E8 Write Protection Status Register PMC_WPSR Read-only 0x0000_0000 - - 0x00EC-0x00FC Reserved - 0x0100 Peripheral Clock Enable Register 1 PMC_PCER1 Write-only - 0x0104 Peripheral Clock Disable Register 1 PMC_PCDR1 Write-only - 0x0108 Peripheral Clock Status Register 1 PMC_PCSR1 Read-only 0x0000_0000 0x010C Reserved - - - SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 529 Table 29-3. Register Mapping (Continued) Offset Register Name 0x0110 Oscillator Calibration Register PMC_OCR Reserved - 0x114-0x120 0134-0x144 Reserved - Note: If an offset is not listed in the table it must be considered as "reserved". 530 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Access Reset Read/Write 0x0040_4040 - - - - 29.17.1 PMC System Clock Enable Register Name: PMC_SCER Address: 0x400E0400 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 PCK2 9 PCK1 8 PCK0 7 UDP 6 - 5 - 4 - 3 - 2 - 1 - 0 - This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * UDP: USB Device Port Clock Enable 0: No effect. 1: Enables the 48 MHz clock (UDPCK) of the USB Device Port. * PCKx: Programmable Clock x Output Enable 0: No effect. 1: Enables the corresponding Programmable Clock output. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 531 29.17.2 PMC System Clock Disable Register Name: PMC_SCDR Address: 0x400E0404 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 PCK2 9 PCK1 8 PCK0 7 UDP 6 - 5 - 4 - 3 - 2 - 1 - 0 - This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * UDP: USB Device Port Clock Disable 0: No effect. 1: Disables the 48 MHz clock (UDPCK) of the USB Device Port. * PCKx: Programmable Clock x Output Disable 0: No effect. 1: Disables the corresponding Programmable Clock output. 532 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.3 PMC System Clock Status Register Name: PMC_SCSR Address: 0x400E0408 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 PCK2 9 PCK1 8 PCK0 7 UDP 6 - 5 - 4 - 3 - 2 - 1 - 0 - * UDP: USB Device Port Clock Status 0: The 48 MHz clock (UDPCK) of the USB Device Port is disabled. 1: The 48 MHz clock (UDPCK) of the USB Device Port is enabled. * PCKx: Programmable Clock x Output Status 0: The corresponding Programmable Clock output is disabled. 1: The corresponding Programmable Clock output is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 533 29.17.4 PMC Peripheral Clock Enable Register 0 Name: PMC_PCER0 Address: 0x400E0410 Access: Write-only 31 PID31 30 PID30 29 PID29 28 PID28 27 PID27 26 PID26 25 PID25 24 PID24 23 PID23 22 PID22 21 PID21 20 PID20 19 PID19 18 PID18 17 PID17 16 PID16 15 PID15 14 PID14 13 PID13 12 PID12 11 PID11 10 PID10 9 PID9 8 PID8 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * PIDx: Peripheral Clock x Enable 0: No effect. 1: Enables the corresponding peripheral clock. Note: PIDx refers to identifiers defined in the section "Peripheral Identifiers". Other peripherals can be enabled in PMC_PCER1 (Section 29.17.23 "PMC Peripheral Clock Enable Register 1"). Note: Programming the control bits of the Peripheral ID that are not implemented has no effect on the behavior of the PMC. 534 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.5 PMC Peripheral Clock Disable Register 0 Name: PMC_PCDR0 Address: 0x400E0414 Access: Write-only 31 PID31 30 PID30 29 PID29 28 PID28 27 PID27 26 PID26 25 PID25 24 PID24 23 PID23 22 PID22 21 PID21 20 PID20 19 PID19 18 PID18 17 PID17 16 PID16 15 PID15 14 PID14 13 PID13 12 PID12 11 PID11 10 PID10 9 PID9 8 PID8 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * PIDx: Peripheral Clock x Disable 0: No effect. 1: Disables the corresponding peripheral clock. Note: PIDx refers to identifiers defined in the section "Peripheral Identifiers". Other peripherals can be disabled in PMC_PCDR1 (Section 29.17.24 "PMC Peripheral Clock Disable Register 1"). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 535 29.17.6 PMC Peripheral Clock Status Register 0 Name: PMC_PCSR0 Address: 0x400E0418 Access: Read-only 31 PID31 30 PID30 29 PID29 28 PID28 27 PID27 26 PID26 25 PID25 24 PID24 23 PID23 22 PID22 21 PID21 20 PID20 19 PID19 18 PID18 17 PID17 16 PID16 15 PID15 14 PID14 13 PID13 12 PID12 11 PID11 10 PID10 9 PID9 8 PID8 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - * PIDx: Peripheral Clock x Status 0: The corresponding peripheral clock is disabled. 1: The corresponding peripheral clock is enabled. Note: PIDx refers to identifiers defined in the section "Peripheral Identifiers". Other peripherals status can be read in PMC_PCSR1 (Section 29.17.25 "PMC Peripheral Clock Status Register 1"). 536 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.7 PMC Clock Generator Main Oscillator Register Name: CKGR_MOR Address: 0x400E0420 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 CFDEN 24 MOSCSEL 23 22 21 20 19 18 17 16 11 10 9 8 3 MOSCRCEN 2 WAITMODE 1 MOSCXTBY 0 MOSCXTEN KEY 15 14 13 12 MOSCXTST 7 - 6 5 MOSCRCF 4 This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * MOSCXTEN: Main Crystal Oscillator Enable A crystal must be connected between XIN and XOUT. 0: The main crystal oscillator is disabled. 1: The main crystal oscillator is enabled. MOSCXTBY must be cleared. When MOSCXTEN is set, the MOSCXTS flag is set once the main crystal oscillator start-up time is achieved. * MOSCXTBY: Main Crystal Oscillator Bypass 0: No effect. 1: The main crystal oscillator is bypassed. MOSCXTEN must be cleared. An external clock must be connected on XIN. When MOSCXTBY is set, the MOSCXTS flag in PMC_SR is automatically set. Clearing MOSCXTEN and MOSCXTBY bits resets the MOSCXTS flag. Note: When the main crystal oscillator bypass is disabled (MOSCXTBY = 0), the MOSCXTS flag must be read at 0 in PMC_SR before enabling the main crystal oscillator (MOSCXTEN = 1). * WAITMODE: Wait Mode Command (Write-only) 0: No effect. 1: Puts the device in Wait mode. * MOSCRCEN: Main On-Chip RC Oscillator Enable 0: The main on-chip RC oscillator is disabled. 1: The main on-chip RC oscillator is enabled. When MOSCRCEN is set, the MOSCRCS flag is set once the main on-chip RC oscillator start-up time is achieved. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 537 * MOSCRCF: Main On-Chip RC Oscillator Frequency Selection At startup, the main on-chip RC oscillator frequency is 4 MHz. Value Name Description 0x0 4_MHz The fast RC oscillator frequency is at 4 MHz (default) 0x1 8_MHz The fast RC oscillator frequency is at 8 MHz 0x2 12_MHz The fast RC oscillator frequency is at 12 MHz Note: MOSCRCF must be changed only if MOSCRCS is set in the PMC_SR. Therefore MOSCRCF and MOSCRCEN cannot be changed at the same time. * MOSCXTST: Main Crystal Oscillator Start-up Time Specifies the number of slow clock cycles multiplied by 8 for the main crystal oscillator start-up time. * KEY: Write Access Password Value Name 0x37 PASSWD Description Writing any other value in this field aborts the write operation. Always reads as 0. * MOSCSEL: Main Oscillator Selection 0: The main on-chip RC oscillator is selected. 1: The main crystal oscillator is selected. * CFDEN: Clock Failure Detector Enable 0: The clock failure detector is disabled. 1: The clock failure detector is enabled. Note: 538 1. The slow RC oscillator must be enabled when the CFDEN is enabled. 2. The clock failure detection must be enabled only when system clock MCK selects the fast RC oscillator. 3. Then the status register must be read 2 slow clock cycles after enabling. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.8 PMC Clock Generator Main Clock Frequency Register Name: CKGR_MCFR Address: 0x400E0424 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 RCMEAS 19 - 18 - 17 - 16 MAINFRDY 15 14 13 12 11 10 9 8 3 2 1 0 MAINF 7 6 5 4 MAINF This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * MAINF: Main Clock Frequency Gives the number of main clock cycles within 16 slow clock periods in order to determine the main clock frequency: fMCK = (MAINF x fSLCK) / 16 where frequency is in MHz. * MAINFRDY: Main Clock Frequency Measure Ready 0: MAINF value is not valid or the main oscillator is disabled or a measure has just been started by means of RCMEAS. 1: The main oscillator has been enabled previously and MAINF value is available. Note: To ensure that a correct value is read on the MAINF field, the MAINFRDY flag must be read at 1 then another read access must be performed on the register to get a stable value on the MAINF field. * RCMEAS: RC Oscillator Frequency Measure (write-only) 0: No effect. 1: Restarts measuring of the main RC frequency. MAINF will carry the new frequency as soon as a low to high transition occurs on the MAINFRDY flag. The measure is performed on the main frequency (i.e. not limited to RC oscillator only), but if the main clock frequency source is the fast crystal oscillator, the restart of measuring is not needed because of the well known stability of crystal oscillators. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 539 29.17.9 PMC Clock Generator PLLA Register Name: CKGR_PLLAR Address: 0x400E0428 Access: Read/Write 31 - 30 - 29 ONE 28 - 27 - 26 25 MULA 24 23 22 21 20 19 18 17 16 10 9 8 2 1 0 MULA 15 - 14 - 13 7 6 5 12 11 PLLACOUNT 4 3 DIVA Possible limitations on PLLA input frequencies and multiplier factors should be checked before using the PMC. Warning: Bit 29 must always be set to 1 when programming the CKGR_PLLAR. This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * DIVA: PLLA Front_End Divider 0: Divider output is stuck at 0 and PLLA is disabled. 1: Divider is bypassed (divide by 1) PLLA is enabled 2-255: Clock is divided by DIVA * PLLACOUNT: PLLA Counter Specifies the number of Slow Clock cycles before the LOCKA bit is set in PMC_SR after CKGR_PLLAR is written. * MULA: PLLA Multiplier 0: The PLLA is deactivated (PLLA also disabled if DIVA = 0). 7 up to 62 = The PLLA Clock frequency is the PLLA input frequency multiplied by MULA + 1. Unlisted values are forbidden. * ONE: Must Be Set to 1 Bit 29 must always be set to 1 when programming the CKGR_PLLAR. 540 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.10PMC Clock Generator PLLB Register Name: CKGR_PLLBR Address: 0x400E042C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 25 MULB 24 23 22 21 20 19 18 17 16 10 9 8 2 1 0 MULB 15 - 14 - 13 7 6 5 12 11 PLLBCOUNT 4 3 DIVB Possible limitations on PLLB input frequencies and multiplier factors should be checked before using the PMC. This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * DIVB: PLLB Front-End Divider 0: Divider output is stuck at 0 and PLLB is disabled. 1: Divider is bypassed (divide by 1) 2-255: Clock is divided by DIVB * PLLBCOUNT: PLLB Counter Specifies the number of Slow Clock cycles before the LOCKB bit is set in PMC_SR after CKGR_PLLBR is written. * MULB: PLLB Multiplier 0: The PLLB is deactivated (PLLB also disabled if DIVB = 0). 7 up to 62: The PLLB Clock frequency is the PLLB input frequency multiplied by MULB + 1. Unlisted values are forbidden. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 541 29.17.11PMC Master Clock Register Name: PMC_MCKR Address: 0x400E0430 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 PLLBDIV2 12 PLLADIV2 11 - 10 - 9 - 8 - 7 - 6 5 PRES 4 3 - 2 - 1 This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * CSS: Master Clock Source Selection Value Name Description 0 SLOW_CLK Slow Clock is selected 1 MAIN_CLK Main Clock is selected 2 PLLA_CLK PLLA Clock is selected 3 PLLB_CLK PLLBClock is selected * PRES: Processor Clock Prescaler Value Name Description 0 CLK_1 Selected clock 1 CLK_2 Selected clock divided by 2 2 CLK_4 Selected clock divided by 4 3 CLK_8 Selected clock divided by 8 4 CLK_16 Selected clock divided by 16 5 CLK_32 Selected clock divided by 32 6 CLK_64 Selected clock divided by 64 7 CLK_3 Selected clock divided by 3 * PLLADIV2: PLLA Divisor by 2 PLLADIV2 542 PLLA Clock Division 0 PLLA clock frequency is divided by 1. 1 PLLA clock frequency is divided by 2. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 0 CSS * PLLBDIV2: PLLB Divisor by 2 PLLBDIV2 PLLB Clock Division 0 PLLB clock frequency is divided by 1. 1 PLLB clock frequency is divided by 2. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 543 29.17.12PMC USB Clock Register Name: PMC_USB Address: 0x400E0438 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 10 9 8 7 - 6 - 5 - 4 - 3 - 1 - 0 USBS USBDIV 2 - This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * USBS: USB Input Clock Selection 0: USB Clock Input is PLLA. 1: USB Clock Input is PLLB * USBDIV: Divider for USB Clock USB Clock is Input clock divided by USBDIV + 1. 544 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.13PMC Programmable Clock Register Name: PMC_PCKx Address: 0x400E0440 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 5 PRES 4 3 - 2 1 CSS 0 This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * CSS: Master Clock Source Selection Value Name Description 0 SLOW_CLK Slow Clock is selected 1 MAIN_CLK Main Clock is selected 2 PLLA_CLK PLLA Clock is selected 3 PLLB_CLK PLLB Clock is selected 4 MCK Master Clock is selected * PRES: Programmable Clock Prescaler Value Name Description 0 CLK_1 Selected clock 1 CLK_2 Selected clock divided by 2 2 CLK_4 Selected clock divided by 4 3 CLK_8 Selected clock divided by 8 4 CLK_16 Selected clock divided by 16 5 CLK_32 Selected clock divided by 32 6 CLK_64 Selected clock divided by 64 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 545 29.17.14PMC Interrupt Enable Register Name: PMC_IER Address: 0x400E0460 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 CFDEV 17 MOSCRCS 16 MOSCSELS 15 - 14 - 13 - 12 - 11 - 10 PCKRDY2 9 PCKRDY1 8 PCKRDY0 7 - 6 - 5 - 4 - 3 MCKRDY 2 LOCKB 1 LOCKA 0 MOSCXTS The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Enables the corresponding interrupt. * MOSCXTS: Main Crystal Oscillator Status Interrupt Enable * LOCKA: PLLA Lock Interrupt Enable * LOCKB: PLLB Lock Interrupt Enable * MCKRDY: Master Clock Ready Interrupt Enable * PCKRDYx: Programmable Clock Ready x Interrupt Enable * MOSCSELS: Main Oscillator Selection Status Interrupt Enable * MOSCRCS: Main On-Chip RC Status Interrupt Enable * CFDEV: Clock Failure Detector Event Interrupt Enable 546 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.15PMC Interrupt Disable Register Name: PMC_IDR Address: 0x400E0464 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 CFDEV 17 MOSCRCS 16 MOSCSELS 15 - 14 - 13 - 12 - 11 - 10 PCKRDY2 9 PCKRDY1 8 PCKRDY0 7 - 6 - 5 - 4 - 3 MCKRDY 2 LOCKB 1 LOCKA 0 MOSCXTS The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Disables the corresponding interrupt. * MOSCXTS: Main Crystal Oscillator Status Interrupt Disable * LOCKA: PLLA Lock Interrupt Disable * LOCKB: PLLB Lock Interrupt Disable * MCKRDY: Master Clock Ready Interrupt Disable * PCKRDYx: Programmable Clock Ready x Interrupt Disable * MOSCSELS: Main Oscillator Selection Status Interrupt Disable * MOSCRCS: Main On-Chip RC Status Interrupt Disable * CFDEV: Clock Failure Detector Event Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 547 29.17.16PMC Status Register Name: PMC_SR Address: 0x400E0468 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 FOS 19 CFDS 18 CFDEV 17 MOSCRCS 16 MOSCSELS 15 - 14 - 13 - 12 - 11 - 10 PCKRDY2 9 PCKRDY1 8 PCKRDY0 7 OSCSELS 6 - 5 - 4 - 3 MCKRDY 2 LOCKB 1 LOCKA 0 MOSCXTS * MOSCXTS: Main Crystal Oscillator Status 0: Main crystal oscillator is not stabilized. 1: Main crystal oscillator is stabilized. * LOCKA: PLLA Lock Status 0: PLLA is not locked 1: PLLA is locked. * LOCKB: PLLB Lock Status 0: PLLB is not locked 1: PLLB is locked. * MCKRDY: Master Clock Status 0: Master Clock is not ready. 1: Master Clock is ready. * OSCSELS: Slow Clock Oscillator Selection 0: Internal slow clock RC oscillator is selected. 1: External slow clock 32 kHz oscillator is selected. * PCKRDYx: Programmable Clock Ready Status 0: Programmable Clock x is not ready. 1: Programmable Clock x is ready. 548 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * MOSCSELS: Main Oscillator Selection Status 0: Selection is in progress. 1: Selection is done. * MOSCRCS: Main On-Chip RC Oscillator Status 0: Main on-chip RC oscillator is not stabilized. 1: Main on-chip RC oscillator is stabilized. * CFDEV: Clock Failure Detector Event 0: No clock failure detection of the fast crystal oscillator clock has occurred since the last read of PMC_SR. 1: At least one clock failure detection of the fast crystal oscillator clock has occurred since the last read of PMC_SR. * CFDS: Clock Failure Detector Status 0: A clock failure of the fast crystal oscillator clock is not detected. 1: A clock failure of the fast crystal oscillator clock is detected. * FOS: Clock Failure Detector Fault Output Status 0: The fault output of the clock failure detector is inactive. 1: The fault output of the clock failure detector is active. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 549 29.17.17PMC Interrupt Mask Register Name: PMC_IMR Address: 0x400E046C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 CFDEV 17 MOSCRCS 16 MOSCSELS 15 - 14 - 13 - 12 - 11 - 10 PCKRDY2 9 PCKRDY1 8 PCKRDY0 7 - 6 - 5 - 4 - 3 MCKRDY 2 LOCKB 1 LOCKA 0 MOSCXTS The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Enables the corresponding interrupt. * MOSCXTS: Main Crystal Oscillator Status Interrupt Mask * LOCKA: PLLA Lock Interrupt Mask * LOCKB: PLLB Lock Interrupt Mask * MCKRDY: Master Clock Ready Interrupt Mask * PCKRDYx: Programmable Clock Ready x Interrupt Mask * MOSCSELS: Main Oscillator Selection Status Interrupt Mask * MOSCRCS: Main On-Chip RC Status Interrupt Mask * CFDEV: Clock Failure Detector Event Interrupt Mask 550 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.18PMC Fast Startup Mode Register Name: PMC_FSMR Address: 0x400E0470 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 21 20 LPM 19 - 18 USBAL 17 RTCAL 16 RTTAL 15 FSTT15 14 FSTT14 13 FSTT13 12 FSTT12 11 FSTT11 10 FSTT10 9 FSTT9 8 FSTT8 7 FSTT7 6 FSTT6 5 FSTT5 4 FSTT4 3 FSTT3 2 FSTT2 1 FSTT1 0 FSTT0 FLPM This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * FSTT0-FSTT15: Fast Startup Input Enable 0 to 15 0: The corresponding wake-up input has no effect on the PMC. 1: The corresponding wake-up input enables a fast restart signal to the PMC. * RTTAL: RTT Alarm Enable 0: The RTT alarm has no effect on the PMC. 1: The RTT alarm enables a fast restart signal to the PMC. * RTCAL: RTC Alarm Enable 0: The RTC alarm has no effect on the PMC. 1: The RTC alarm enables a fast restart signal to the PMC. * USBAL: USB Alarm Enable 0: The USB alarm has no effect on the PMC. 1: The USB alarm enables a fast restart signal to the PMC. * LPM: Low-power Mode 0: The WaitForInterrupt (WFI) or the WaitForEvent (WFE) instruction of the processor makes the processor enter Sleep mode. 1: The WaitForEvent (WFE) instruction of the processor makes the system to enter Wait mode. * FLPM: Flash Low-power Mode Value Name Description 0 FLASH_STANDBY Flash is in Standby Mode when system enters Wait Mode 1 FLASH_DEEP_POWERDOWN Flash is in Deep-power-down mode when system enters Wait Mode 2 FLASH_IDLE Idle mode SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 551 29.17.19PMC Fast Startup Polarity Register Name: PMC_FSPR Address: 0x400E0474 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 FSTP15 14 FSTP14 13 FSTP13 12 FSTP12 11 FSTP11 10 FSTP10 9 FSTP9 8 FSTP8 7 FSTP7 6 FSTP6 5 FSTP5 4 FSTP4 3 FSTP3 2 FSTP2 1 FSTP1 0 FSTP0 This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * FSTPx: Fast Startup Input Polarityx Defines the active polarity of the corresponding wake-up input. If the corresponding wake-up input is enabled and at the FSTP level, it enables a fast restart signal. 552 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.20PMC Fault Output Clear Register Name: PMC_FOCR Address: 0x400E0478 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 FOCLR * FOCLR: Fault Output Clear Clears the clock failure detector fault output. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 553 29.17.21PMC Write Protection Mode Register Name: PMC_WPMR Address: 0x400E04E4 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x504D43 ("PMC" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x504D43 ("PMC" in ASCII). See Section 29.16 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protection Key Value 0x504D43 554 Name Description PASSWD Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.22PMC Write Protection Status Register Name: PMC_WPSR Address: 0x400E04E8 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPVS WPVSRC 15 14 13 12 WPVSRC 7 - 6 - 5 - 4 - * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the PMC_WPSR. 1: A write protection violation has occurred since the last read of the PMC_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 555 29.17.23PMC Peripheral Clock Enable Register 1 Name: PMC_PCER1 Address: 0x400E0500 Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - - PID34 PID33 PID32 This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * PIDx: Peripheral Clock x Enable 0: No effect. 1: Enables the corresponding peripheral clock. Notes: 556 1. The values for PIDx are defined in the section "Peripheral Identifiers" in the product datasheet. 2. Programming the control bits of the Peripheral ID that are not implemented has no effect on the behavior of the PMC. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.24PMC Peripheral Clock Disable Register 1 Name: PMC_PCDR1 Address: 0x400E0504 Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - - PID34 PID33 PID32 This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * PIDx: Peripheral Clock x Disable 0: No effect. 1: Disables the corresponding peripheral clock. Note: The values for PIDx are defined in the section "Peripheral Identifiers" in the product datasheet. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 557 29.17.25PMC Peripheral Clock Status Register 1 Name: PMC_PCSR1 Address: 0x400E0508 Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - - PID34 PID33 PID32 * PIDx: Peripheral Clock x Status 0: The corresponding peripheral clock is disabled. 1: The corresponding peripheral clock is enabled. Note: The values for PIDx are defined in the section "Peripheral Identifiers" in the product datasheet. 558 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 29.17.26PMC Oscillator Calibration Register Name: PMC_OCR Address: 0x400E0510 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 SEL12 22 21 20 19 CAL12 18 17 16 15 SEL8 14 13 12 11 CAL8 10 9 8 7 SEL4 6 5 4 3 CAL4 2 1 0 This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register. * CAL4: RC Oscillator Calibration bits for 4 MHz Calibration bits applied to the RC Oscillator when SEL4 is set. * SEL4: Selection of RC Oscillator Calibration bits for 4 MHz 0: Default value stored in Flash memory. 1: Value written by user in CAL4 field of this register. * CAL8: RC Oscillator Calibration bits for 8 MHz Calibration bits applied to the RC Oscillator when SEL8 is set. * SEL8: Selection of RC Oscillator Calibration bits for 8 MHz 0: Factory-determined value stored in Flash memory. 1: Value written by user in CAL8 field of this register. * CAL12: RC Oscillator Calibration bits for 12 MHz Calibration bits applied to the RC Oscillator when SEL12 is set. * SEL12: Selection of RC Oscillator Calibration bits for 12 MHz 0: Factory-determined value stored in Flash memory. 1: Value written by user in CAL12 field of this register. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 559 30. Chip Identifier (CHIPID) 30.1 Description Chip Identifier (CHIPID) registers permit recognition of the device and its revision. These registers provide the sizes and types of the on-chip memories, as well as the set of embedded peripherals. Two CHIPID registers are embedded: Chip ID Register (CHIPID_CIDR) and Chip ID Extension Register (CHIPID_EXID). Both registers contain a hard-wired value that is read-only. The CHIPID_CIDR contains the following fields: VERSION: Identifies the revision of the silicon EPROC: Indicates the embedded ARM processor NVPTYP and NVPSIZ: Identify the type of embedded non-volatile memory and the size SRAMSIZ: Indicates the size of the embedded SRAM ARCH: Identifies the set of embedded peripherals EXT: Shows the use of the extension identifier register The CHIPID_EXID register is device-dependent and reads 0 if CHIPID_CIDR.EXT = 0. 560 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 30.2 Embedded Characteristics Chip ID Registers Table 30-1. Identification of the Device Revision, Sizes of the Embedded Memories, Set of Peripherals, Embedded Processor SAM4S Chip ID Registers Chip Name CHIPID_CIDR CHIPID_EXID SAM4SD32C (Rev A) 0x29A7_0EE0 0x0 SAM4SD32C (Rev B) 0x29A7_0EE1 0x0 SAM4SD32B (Rev A) 0x2997_0EE0 0x0 SAM4SD32B (Rev B) 0x2997_0EE1 0x0 SAM4SD16C (Rev A) 0x29A7_0CE0 0x0 SAM4SD16C (Rev B) 0x29A7_0CE1 0x0 SAM4SD16B (Rev A) 0x2997_0CE0 0x0 SAM4SD16B (Rev B) 0x2997_0CE1 0x0 SAM4SA16C (Rev A) 0x28A7_0CE0 0x0 SAM4SA16C (Rev B) 0x28A7_0CE1 0x0 SAM4SA16B (Rev A) 0x2897_0CE0 0x0 SAM4SA16B (Rev B) 0x2897_0CE1 0x0 SAM4S16B (Rev A) 0x289C_0CE0 0x0 SAM4S16B (Rev B) 0x289C_0CE1 0x0 SAM4S16C (Rev A) 0x28AC_0CE0 0x0 SAM4S16C (Rev B) 0x28AC_0CE1 0x0 SAM4S8B (Rev A) 0x289C_0AE0 0x0 SAM4S8B (Rev B) 0x289C_0AE1 0x0 SAM4S8C (Rev A) 0x28AC_0AE0 0x0 SAM4S8C (Rev B) 0x28AC_0AE1 0x0 SAM4S4C (Rev A) 0x28AB_09E0 0x0 SAM4S4C (Rev B) 0x28AB_09E1 0x0 SAM4S4B (Rev A) 0x289B_09E0 0x0 SAM4S4B (Rev B) 0x289B_09E1 0x0 SAM4S4A (Rev A) 0x288B_09E0 0x0 SAM4S4A (Rev B) 0x288B_09E1 0x0 SAM4S2C (Rev A) 0x28AB_07E0 0x0 SAM4S2C (Rev B) 0x28AB_07E1 0x0 SAM4S2B (Rev A) 0x289B_07E0 0x0 SAM4S2B (Rev B) 0x289B_07E1 0x0 SAM4S2A (Rev A) 0x288B_07E0 0x0 SAM4S2A (Rev B) 0x288B_07E1 0x0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 561 30.3 Chip Identifier (CHIPID) User Interface Table 30-2. Offset 562 Register Mapping Register Name 0x0 Chip ID Register 0x4 Chip ID Extension Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Access Reset CHIPID_CIDR Read-only - CHIPID_EXID Read-only - 30.3.1 Chip ID Register Name: CHIPID_CIDR Address: 0x400E0740 Access: Read-only 31 EXT 30 23 22 29 NVPTYP 28 21 20 27 26 19 18 ARCH 15 14 13 6 EPROC 24 17 16 9 8 1 0 SRAMSIZ 12 11 NVPSIZ2 7 25 ARCH 10 NVPSIZ 5 4 3 2 VERSION * VERSION: Version of the Device Current version of the device. * EPROC: Embedded Processor Value Name Description 0 SAM x7 Cortex-M7 1 ARM946ES ARM946ES 2 ARM7TDMI ARM7TDMI 3 CM3 Cortex-M3 4 ARM920T ARM920T 5 ARM926EJS ARM926EJS 6 CA5 Cortex-A5 7 CM4 Cortex-M4 * NVPSIZ: Nonvolatile Program Memory Size Value Name Description 0 NONE None 1 8K 8 Kbytes 2 16K 16 Kbytes 3 32K 32 Kbytes 4 - Reserved 5 64K 64 Kbytes 6 - Reserved 7 128K 128 Kbytes 8 160K 160 Kbytes 9 256K 256 Kbytes 10 512K 512 Kbytes SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 563 Value Name Description 11 - Reserved 12 1024K 1024 Kbytes 13 - Reserved 14 2048K 2048 Kbytes 15 - Reserved * NVPSIZ2: Second Nonvolatile Program Memory Size Value Name Description 0 NONE None 1 8K 8 Kbytes 2 16K 16 Kbytes 3 32K 32 Kbytes 4 - Reserved 5 64K 64 Kbytes 6 - Reserved 7 128K 128 Kbytes 8 - Reserved 9 256K 256 Kbytes 10 512K 512 Kbytes 11 - Reserved 12 1024K 1024 Kbytes 13 - Reserved 14 2048K 2048 Kbytes 15 - Reserved * SRAMSIZ: Internal SRAM Size Value 564 Name Description 0 48K 48 Kbytes 1 192K 192 Kbytes 2 384K 384 Kbytes 3 6K 6 Kbytes 4 24K 24 Kbytes 5 4K 4 Kbytes 6 80K 80 Kbytes 7 160K 160 Kbytes 8 8K 8 Kbytes 9 16K 16 Kbytes 10 32K 32 Kbytes 11 64K 64 Kbytes SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Value Name Description 12 128K 128 Kbytes 13 256K 256 Kbytes 14 96K 96 Kbytes 15 512K 512 Kbytes * ARCH: Architecture Identifier Value Name Description 0x88 SAM4SxA SAM4SxA (48-pin version) 0x89 SAM4SxB SAM4SxB (64-pin version) 0x8A SAM4SxC SAM4SxC (100-pin version) * NVPTYP: Nonvolatile Program Memory Type Value Name Description 0 ROM ROM 1 ROMLESS ROMless or on-chip Flash 2 FLASH Embedded Flash Memory ROM and Embedded Flash Memory 3 ROM_FLASH NVPSIZ is ROM size NVPSIZ2 is Flash size 4 SRAM SRAM emulating ROM * EXT: Extension Flag 0: Chip ID has a single register definition without extension. 1: An extended Chip ID exists. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 565 30.3.2 Chip ID Extension Register Name: CHIPID_EXID Address: 0x400E0744 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 EXID 23 22 21 20 EXID 15 14 13 12 EXID 7 6 5 4 EXID * EXID: Chip ID Extension This field is cleared if CHIPID_CIDR.EXT = 0. 566 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31. Parallel Input/Output Controller (PIO) 31.1 Description The Parallel Input/Output Controller (PIO) manages up to 32 fully programmable input/output lines. Each I/O line may be dedicated as a general-purpose I/O or be assigned to a function of an embedded peripheral. This ensures effective optimization of the pins of the product. Each I/O line is associated with a bit number in all of the 32-bit registers of the 32-bit wide user interface. Each I/O line of the PIO Controller features: An input change interrupt enabling level change detection on any I/O line. Additional Interrupt modes enabling rising edge, falling edge, low-level or high-level detection on any I/O line. A glitch filter providing rejection of glitches lower than one-half of peripheral clock cycle. A debouncing filter providing rejection of unwanted pulses from key or push button operations. Multi-drive capability similar to an open drain I/O line. Control of the pull-up and pull-down of the I/O line. Input visibility and output control. The PIO Controller also features a synchronous output providing up to 32 bits of data output in a single write operation. An 8-bit parallel capture mode is also available which can be used to interface a CMOS digital image sensor, an ADC, a DSP synchronous port in synchronous mode, etc. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 567 31.2 Embedded Characteristics Up to 32 Programmable I/O Lines Fully Programmable through Set/Clear Registers Multiplexing of Four Peripheral Functions per I/O Line For each I/O Line (Whether Assigned to a Peripheral or Used as General Purpose I/O) Input Change Interrupt Programmable Glitch Filter Programmable Debouncing Filter Multi-drive Option Enables Driving in Open Drain Programmable Pull-Up on Each I/O Line Pin Data Status Register, Supplies Visibility of the Level on the Pin at Any Time Additional Interrupt Modes on a Programmable Event: Rising Edge, Falling Edge, Low-Level or HighLevel 568 Lock of the Configuration by the Connected Peripheral Synchronous Output, Provides Set and Clear of Several I/O Lines in a Single Write Register Write Protection Programmable Schmitt Trigger Inputs Parallel Capture Mode Can Be Used to Interface a CMOS Digital Image Sensor, an ADC, etc. One Clock, 8-bit Parallel Data and Two Data Enable on I/O Lines Data Can be Sampled Every Other Time (For Chrominance Sampling Only) Supports Connection of One Peripheral DMA Controller (PDC) Channel Which Offers Buffer Reception Without Processor Intervention SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.3 Block Diagram Figure 31-1. Block Diagram PIODCCLK Data Status PDC PIODC[7:0] Parallel Capture Mode Events PIODCEN1 PIODCEN2 PIO Interrupt Interrupt Controller Peripheral Clock PMC PIO Controller Data, Enable Up to x peripheral IOs Embedded Peripheral PIN 0 Data, Enable PIN 1 Embedded Peripheral Up to x peripheral IOs x is an integer representing the maximum number of IOs managed by one PIO controller. Table 31-1. PIN x-1 APB Signal Description Signal Name Signal Description Signal Type PIODCCLK Parallel Capture Mode Clock Input PIODC[7:0] Parallel Capture Mode Data Input PIODCEN1 Parallel Capture Mode Data Enable 1 Input PIODCEN2 Parallel Capture Mode Data Enable 2 Input SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 569 31.4 Product Dependencies 31.4.1 Pin Multiplexing Each pin is configurable, depending on the product, as either a general-purpose I/O line only, or as an I/O line multiplexed with one or two peripheral I/Os. As the multiplexing is hardware defined and thus product-dependent, the hardware designer and programmer must carefully determine the configuration of the PIO Controllers required by their application. When an I/O line is general-purpose only, i.e., not multiplexed with any peripheral I/O, programming of the PIO Controller regarding the assignment to a peripheral has no effect and only the PIO Controller can control how the pin is driven by the product. 31.4.2 Power Management The Power Management Controller controls the peripheral clock in order to save power. Writing any of the registers of the user interface does not require the peripheral clock to be enabled. This means that the configuration of the I/O lines does not require the peripheral clock to be enabled. However, when the clock is disabled, not all of the features of the PIO Controller are available, including glitch filtering. Note that the input change interrupt, the interrupt modes on a programmable event and the read of the pin level require the clock to be validated. After a hardware reset, the peripheral clock is disabled by default. The user must configure the Power Management Controller before any access to the input line information. 31.4.3 Interrupt Sources For interrupt handling, the PIO Controllers are considered as user peripherals. This means that the PIO Controller interrupt lines are connected among the interrupt sources. Refer to the PIO Controller peripheral identifier in the Peripheral Identifiers table to identify the interrupt sources dedicated to the PIO Controllers. Using the PIO Controller requires the Interrupt Controller to be programmed first. The PIO Controller interrupt can be generated only if the peripheral clock is enabled. Table 31-2. 570 Peripheral IDs Instance ID PIOA 11 PIOB 12 PIOC 13 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.5 Functional Description The PIO Controller features up to 32 fully-programmable I/O lines. Most of the control logic associated to each I/O is represented in Figure 31-2. In this description each signal shown represents one of up to 32 possible indexes. Figure 31-2. I/O Line Control Logic PIO_OER[0] VDD PIO_OSR[0] PIO_PUER[0] PIO_ODR[0] PIO_PUSR[0] PIO_PUDR[0] 1 Peripheral A Output Enable 00 01 10 11 Peripheral B Output Enable Peripheral C Output Enable Peripheral D Output Enable 0 0 PIO_PER[0] PIO_ABCDSR1[0] PIO_PDR[0] 00 01 10 11 Peripheral B Output Peripheral C Output Peripheral D Output 1 PIO_PSR[0] PIO_ABCDSR2[0] Peripheral A Output Integrated Pull-Up Resistor PIO_MDER[0] PIO_MDSR[0] 0 PIO_MDDR[0] 0 PIO_SODR[0] 1 PIO_ODSR[0] Pad PIO_CODR[0] 1 PIO_PPDER[0] Integrated Pull-Down Resistor PIO_PPDSR[0] PIO_PPDDR[0] GND Peripheral A Input Peripheral B Input Peripheral C Input Peripheral D Input PIO_PDSR[0] PIO_ISR[0] 0 D Peripheral Clock 0 Slow Clock PIO_SCDR Clock Divider div_slck 1 Programmable Glitch or Debouncing Filter Q DFF D Q DFF EVENT DETECTOR (Up to 32 possible inputs) PIO Interrupt 1 Peripheral Clock Resynchronization Stage PIO_IER[0] PIO_IMR[0] PIO_IFER[0] PIO_IDR[0] PIO_IFSR[0] PIO_IFSCER[0] PIO_IFDR[0] PIO_IFSCSR[0] PIO_IFSCDR[0] PIO_ISR[31] PIO_IER[31] PIO_IMR[31] PIO_IDR[31] 31.5.1 Pull-up and Pull-down Resistor Control Each I/O line is designed with an embedded pull-up resistor and an embedded pull-down resistor. The pull-up resistor can be enabled or disabled by writing to the Pull-up Enable Register (PIO_PUER) or Pull-up Disable Register (PIO_PUDR), respectively. Writing to these registers results in setting or clearing the corresponding bit in the Pull-up Status Register (PIO_PUSR). Reading a one in PIO_PUSR means the pull-up is disabled and reading a zero means the pull-up is enabled. The pull-down resistor can be enabled or disabled by writing the Pull-down Enable Register (PIO_PPDER) or the Pull-down Disable Register (PIO_PPDDR), respectively. Writing in these SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 571 registers results in setting or clearing the corresponding bit in the Pull-down Status Register (PIO_PPDSR). Reading a one in PIO_PPDSR means the pull-up is disabled and reading a zero means the pull-down is enabled. Enabling the pull-down resistor while the pull-up resistor is still enabled is not possible. In this case, the write of PIO_PPDER for the relevant I/O line is discarded. Likewise, enabling the pull-up resistor while the pull-down resistor is still enabled is not possible. In this case, the write of PIO_PUER for the relevant I/O line is discarded. Control of the pull-up resistor is possible regardless of the configuration of the I/O line. After reset, depending on the I/O, pull-up or pull-down can be set. 31.5.2 I/O Line or Peripheral Function Selection When a pin is multiplexed with one or two peripheral functions, the selection is controlled with the Enable Register (PIO_PER) and the Disable Register (PIO_PDR). The Status Register (PIO_PSR) is the result of the set and clear registers and indicates whether the pin is controlled by the corresponding peripheral or by the PIO Controller. A value of zero indicates that the pin is controlled by the corresponding on-chip peripheral selected in the ABCD Select registers (PIO_ABCDSR1 and PIO_ABCDSR2). A value of one indicates the pin is controlled by the PIO Controller. If a pin is used as a general-purpose I/O line (not multiplexed with an on-chip peripheral), PIO_PER and PIO_PDR have no effect and PIO_PSR returns a one for the corresponding bit. After reset, the I/O lines are controlled by the PIO Controller, i.e., PIO_PSR resets at one. However, in some events, it is important that PIO lines are controlled by the peripheral (as in the case of memory chip select lines that must be driven inactive after reset, or for address lines that must be driven low for booting out of an external memory). Thus, the reset value of PIO_PSR is defined at the product level and depends on the multiplexing of the device. 31.5.3 Peripheral A or B or C or D Selection The PIO Controller provides multiplexing of up to four peripheral functions on a single pin. The selection is performed by writing PIO_ABCDSR1 and PIO_ABCDSR2. For each pin: The corresponding bit at level zero in PIO_ABCDSR1 and the corresponding bit at level zero in PIO_ABCDSR2 means peripheral A is selected. The corresponding bit at level one in PIO_ABCDSR1 and the corresponding bit at level zero in PIO_ABCDSR2 means peripheral B is selected. The corresponding bit at level zero in PIO_ABCDSR1 and the corresponding bit at level one in PIO_ABCDSR2 means peripheral C is selected. The corresponding bit at level one in PIO_ABCDSR1 and the corresponding bit at level one in PIO_ABCDSR2 means peripheral D is selected. Note that multiplexing of peripheral lines A, B, C and D only affects the output line. The peripheral input lines are always connected to the pin input (see Figure 31-2). Writing in PIO_ABCDSR1 and PIO_ABCDSR2 manages the multiplexing regardless of the configuration of the pin. However, assignment of a pin to a peripheral function requires a write in PIO_ABCDSR1 and PIO_ABCDSR2 in addition to a write in PIO_PDR. After reset, PIO_ABCDSR1 and PIO_ABCDSR2 are zero, thus indicating that all the PIO lines are configured on peripheral A. However, peripheral A generally does not drive the pin as the PIO Controller resets in I/O line mode. If the software selects a peripheral A, B, C or D which does not exist for a pin, no alternate functions are enabled for this pin and the selection is taken into account. The PIO Controller does not carry out checks to prevent selection of a peripheral which does not exist. 572 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.5.4 Output Control When the I/O line is assigned to a peripheral function, i.e., the corresponding bit in PIO_PSR is at zero, the drive of the I/O line is controlled by the peripheral. Peripheral A or B or C or D depending on the value in PIO_ABCDSR1 and PIO_ABCDSR2 determines whether the pin is driven or not. When the I/O line is controlled by the PIO Controller, the pin can be configured to be driven. This is done by writing the Output Enable Register (PIO_OER) and Output Disable Register (PIO_ODR). The results of these write operations are detected in the Output Status Register (PIO_OSR). When a bit in this register is at zero, the corresponding I/O line is used as an input only. When the bit is at one, the corresponding I/O line is driven by the PIO Controller. The level driven on an I/O line can be determined by writing in the Set Output Data Register (PIO_SODR) and the Clear Output Data Register (PIO_CODR). These write operations, respectively, set and clear the Output Data Status Register (PIO_ODSR), which represents the data driven on the I/O lines. Writing in PIO_OER and PIO_ODR manages PIO_OSR whether the pin is configured to be controlled by the PIO Controller or assigned to a peripheral function. This enables configuration of the I/O line prior to setting it to be managed by the PIO Controller. Similarly, writing in PIO_SODR and PIO_CODR affects PIO_ODSR. This is important as it defines the first level driven on the I/O line. 31.5.5 Synchronous Data Output Clearing one or more PIO line(s) and setting another one or more PIO line(s) synchronously cannot be done by using PIO_SODR and PIO_CODR. It requires two successive write operations into two different registers. To overcome this, the PIO Controller offers a direct control of PIO outputs by single write access to PIO_ODSR. Only bits unmasked by the Output Write Status Register (PIO_OWSR) are written. The mask bits in PIO_OWSR are set by writing to the Output Write Enable Register (PIO_OWER) and cleared by writing to the Output Write Disable Register (PIO_OWDR). After reset, the synchronous data output is disabled on all the I/O lines as PIO_OWSR resets at 0x0. 31.5.6 Multi-Drive Control (Open Drain) Each I/O can be independently programmed in open drain by using the multi-drive feature. This feature permits several drivers to be connected on the I/O line which is driven low only by each device. An external pull-up resistor (or enabling of the internal one) is generally required to guarantee a high level on the line. The multi-drive feature is controlled by the Multi-driver Enable Register (PIO_MDER) and the Multi-driver Disable Register (PIO_MDDR). The multi-drive can be selected whether the I/O line is controlled by the PIO Controller or assigned to a peripheral function. The Multi-driver Status Register (PIO_MDSR) indicates the pins that are configured to support external drivers. After reset, the multi-drive feature is disabled on all pins, i.e., PIO_MDSR resets at value 0x0. 31.5.7 Output Line Timings Figure 31-3 shows how the outputs are driven either by writing PIO_SODR or PIO_CODR, or by directly writing PIO_ODSR. This last case is valid only if the corresponding bit in PIO_OWSR is set. Figure 31-3 also shows when the feedback in the Pin Data Status Register (PIO_PDSR) is available. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 573 Figure 31-3. Output Line Timings Peripheral clock Write PIO_SODR Write PIO_ODSR at 1 APB Access Write PIO_CODR Write PIO_ODSR at 0 APB Access PIO_ODSR 2 cycles 2 cycles PIO_PDSR 31.5.8 Inputs The level on each I/O line can be read through PIO_PDSR. This register indicates the level of the I/O lines regardless of their configuration, whether uniquely as an input, or driven by the PIO Controller, or driven by a peripheral. Reading the I/O line levels requires the clock of the PIO Controller to be enabled, otherwise PIO_PDSR reads the levels present on the I/O line at the time the clock was disabled. 31.5.9 Input Glitch and Debouncing Filters Optional input glitch and debouncing filters are independently programmable on each I/O line. The glitch filter can filter a glitch with a duration of less than 1/2 peripheral clock and the debouncing filter can filter a pulse of less than 1/2 period of a programmable divided slow clock. The selection between glitch filtering or debounce filtering is done by writing in the PIO Input Filter Slow Clock Disable Register (PIO_IFSCDR) and the PIO Input Filter Slow Clock Enable Register (PIO_IFSCER). Writing PIO_IFSCDR and PIO_IFSCER, respectively, sets and clears bits in the Input Filter Slow Clock Status Register (PIO_IFSCSR). The current selection status can be checked by reading the PIO_IFSCSR. If PIO_IFSCSR[i] = 0: The glitch filter can filter a glitch with a duration of less than 1/2 master clock period. If PIO_IFSCSR[i] = 1: The debouncing filter can filter a pulse with a duration of less than 1/2 programmable divided slow clock period. For the debouncing filter, the period of the divided slow clock is defined by writing in the DIV field of the Slow Clock Divider Debouncing Register (PIO_SCDR): tdiv_slck = ((DIV + 1) x 2) x tslck When the glitch or debouncing filter is enabled, a glitch or pulse with a duration of less than 1/2 selected clock cycle (selected clock represents peripheral clock or divided slow clock depending on PIO_IFSCDR and PIO_IFSCER programming) is automatically rejected, while a pulse with a duration of one selected clock (peripheral clock or divided slow clock) cycle or more is accepted. For pulse durations between 1/2 selected clock cycle and one selected clock cycle, the pulse may or may not be taken into account, depending on the precise timing of its occurrence. Thus for a pulse to be visible, it must exceed one selected clock cycle, whereas for a glitch to be reliably filtered out, its duration must not exceed 1/2 selected clock cycle. The filters also introduce some latencies, illustrated in Figure 31-4 and Figure 31-5. 574 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The glitch filters are controlled by the Input Filter Enable Register (PIO_IFER), the Input Filter Disable Register (PIO_IFDR) and the Input Filter Status Register (PIO_IFSR). Writing PIO_IFER and PIO_IFDR respectively sets and clears bits in PIO_IFSR. This last register enables the glitch filter on the I/O lines. When the glitch and/or debouncing filter is enabled, it does not modify the behavior of the inputs on the peripherals. It acts only on the value read in PIO_PDSR and on the input change interrupt detection. The glitch and debouncing filters require that the peripheral clock is enabled. Figure 31-4. Input Glitch Filter Timing PIO_IFCSR = 0 Peripheral clcok up to 1.5 cycles Pin Level 1 cycle 1 cycle 1 cycle 1 cycle PIO_PDSR if PIO_IFSR = 0 2 cycles up to 2.5 cycles PIO_PDSR if PIO_IFSR = 1 Figure 31-5. 1 cycle up to 2 cycles Input Debouncing Filter Timing PIO_IFCSR = 1 Divided Slow Clock (div_slck) Pin Level up to 2 cycles tperipheral clock up to 2 cycles tperipheral clock PIO_PDSR if PIO_IFSR = 0 1 cycle tdiv_slck PIO_PDSR if PIO_IFSR = 1 1 cycle tdiv_slck up to 1.5 cycles tdiv_slck up to 1.5 cycles tdiv_slck up to 2 cycles tperipheral clock up to 2 cycles tperipheral clock 31.5.10 Input Edge/Level Interrupt The PIO Controller can be programmed to generate an interrupt when it detects an edge or a level on an I/O line. The Input Edge/Level interrupt is controlled by writing the Interrupt Enable Register (PIO_IER) and the Interrupt Disable Register (PIO_IDR), which enable and disable the input change interrupt respectively by setting and clearing the corresponding bit in the Interrupt Mask Register (PIO_IMR). As input change detection is possible only by comparing two successive samplings of the input of the I/O line, the peripheral clock must be enabled. The Input Change interrupt is available regardless of the configuration of the I/O line, i.e., configured as an input only, controlled by the PIO Controller or assigned to a peripheral function. By default, the interrupt can be generated at any time an edge is detected on the input. Some additional interrupt modes can be enabled/disabled by writing in the Additional Interrupt Modes Enable Register (PIO_AIMER) and Additional Interrupt Modes Disable Register (PIO_AIMDR). The current state of this selection can be read through the Additional Interrupt Modes Mask Register (PIO_AIMMR). These additional modes are: SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 575 Rising edge detection Falling edge detection Low-level detection High-level detection In order to select an additional interrupt mode: The type of event detection (edge or level) must be selected by writing in the Edge Select Register (PIO_ESR) and Level Select Register (PIO_LSR) which select, respectively, the edge and level detection. The current status of this selection is accessible through the Edge/Level Status Register (PIO_ELSR). The polarity of the event detection (rising/falling edge or high/low-level) must be selected by writing in the Falling Edge/Low-Level Select Register (PIO_FELLSR) and Rising Edge/High-Level Select Register (PIO_REHLSR) which allow to select falling or rising edge (if edge is selected in PIO_ELSR) edge or highor low-level detection (if level is selected in PIO_ELSR). The current status of this selection is accessible through the Fall/Rise - Low/High Status Register (PIO_FRLHSR). When an input edge or level is detected on an I/O line, the corresponding bit in the Interrupt Status Register (PIO_ISR) is set. If the corresponding bit in PIO_IMR is set, the PIO Controller interrupt line is asserted.The interrupt signals of the 32 channels are ORed-wired together to generate a single interrupt signal to the interrupt controller. When the software reads PIO_ISR, all the interrupts are automatically cleared. This signifies that all the interrupts that are pending when PIO_ISR is read must be handled. When an Interrupt is enabled on a "level", the interrupt is generated as long as the interrupt source is not cleared, even if some read accesses in PIO_ISR are performed. 576 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 31-6. Event Detector on Input Lines (Figure Represents Line 0) Event Detector Rising Edge Detector 1 Falling Edge Detector 0 0 PIO_REHLSR[0] 1 PIO_FRLHSR[0] Resynchronized input on line 0 Event detection on line 0 1 PIO_FELLSR[0] 0 High Level Detector 1 Low Level Detector 0 PIO_LSR[0] PIO_ELSR[0] PIO_ESR[0] PIO_AIMER[0] PIO_AIMMR[0] PIO_AIMDR[0] Edge Detector Example of interrupt generation on following lines: Rising edge on PIO line 0 Falling edge on PIO line 1 Rising edge on PIO line 2 Low-level on PIO line 3 High-level on PIO line 4 High-level on PIO line 5 Falling edge on PIO line 6 Rising edge on PIO line 7 Any edge on the other lines Table 31-3 provides the required configuration for this example. Table 31-3. Configuration for Example Interrupt Generation Configuration Description All the interrupt sources are enabled by writing 32'hFFFF_FFFF in PIO_IER. Interrupt Mode Then the additional interrupt mode is enabled for lines 0 to 7 by writing 32'h0000_00FF in PIO_AIMER. Edge or Level Detection The other lines are configured in edge detection by default, if they have not been previously configured. Otherwise, lines 0, 1, 2, 6 and 7 must be configured in edge detection by writing 32'h0000_00C7 in PIO_ESR. Lines 3, 4 and 5 are configured in level detection by writing 32'h0000_0038 in PIO_LSR. Falling/Rising Edge or Low/High-Level Detection Lines 0, 2, 4, 5 and 7 are configured in rising edge or high-level detection by writing 32'h0000_00B5 in PIO_REHLSR. The other lines are configured in falling edge or low-level detection by default if they have not been previously configured. Otherwise, lines 1, 3 and 6 must be configured in falling edge/low-level detection by writing 32'h0000_004A in PIO_FELLSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 577 Figure 31-7. Input Change Interrupt Timings When No Additional Interrupt Modes Peripheral clock Pin Level PIO_ISR Read PIO_ISR APB Access APB Access 31.5.11 I/O Lines Lock When an I/O line is controlled by a peripheral (particularly the Pulse Width Modulation Controller PWM), it can become locked by the action of this peripheral via an input of the PIO Controller. When an I/O line is locked, the write of the corresponding bit in PIO_PER, PIO_PDR, PIO_MDER, PIO_MDDR, PIO_PUDR, PIO_PUER, PIO_ABCDSR1 and PIO_ABCDSR2 is discarded in order to lock its configuration. The user can know at anytime which I/O line is locked by reading the PIO Lock Status Register (PIO_LOCKSR). Once an I/O line is locked, the only way to unlock it is to apply a hardware reset to the PIO Controller. 31.5.12 Programmable Schmitt Trigger It is possible to configure each input for the Schmitt trigger. By default the Schmitt trigger is active. Disabling the Schmitt trigger is requested when using the QTouch(R) Library. 31.5.13 Parallel Capture Mode 31.5.13.1 Overview The PIO Controller integrates an interface able to read data from a CMOS digital image sensor, a high-speed parallel ADC, a DSP synchronous port in synchronous mode, etc. For better understanding and to ease reading, the following description uses an example with a CMOS digital image sensor. 31.5.13.2 Functional Description The CMOS digital image sensor provides a sensor clock, an 8-bit data synchronous with the sensor clock and two data enables which are also synchronous with the sensor clock. Figure 31-8. PIO Controller Connection with CMOS Digital Image Sensor PIO Controller Parallel Capture Mode PDC 578 Data PIODCCLK CMOS Digital Image Sensor PCLK Status PIODC[7:0] DATA[7:0] Events PIODCEN1 VSYNC PIODCEN2 HSYNC SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 As soon as the parallel capture mode is enabled by writing a one to the PCEN bit in PIO_PCMR, the I/O lines connected to the sensor clock (PIODCCLK), the sensor data (PIODC[7:0]) and the sensor data enable signals (PIODCEN1 and PIODCEN2) are configured automatically as inputs. To know which I/O lines are associated with the sensor clock, the sensor data and the sensor data enable signals, refer to the I/O multiplexing table(s) in the section "Package and Pinout". Once enabled, the parallel capture mode samples the data at rising edge of the sensor clock and resynchronizes it with the peripheral clock domain. The size of the data which can be read in PIO_PCRHR can be programmed using the DSIZE field in PIO_PCMR. If this data size is larger than 8 bits, then the parallel capture mode samples several sensor data to form a concatenated data of size defined by DSIZE. Then this data is stored in PIO_PCRHR and the flag DRDY is set to one in PIO_PCISR. The parallel capture mode can be associated with a reception channel of the Peripheral DMA Controller (PDC). This performs reception transfer from parallel capture mode to a memory buffer without any intervention from the CPU. Transfer status signals from PDC are available in PIO_PCISR through the flags ENDRX and RXBUFF. The parallel capture mode can take into account the sensor data enable signals or not. If the bit ALWYS is set to zero in PIO_PCMR, the parallel capture mode samples the sensor data at the rising edge of the sensor clock only if both data enable signals are active (at one). If the bit ALWYS is set to one, the parallel capture mode samples the sensor data at the rising edge of the sensor clock whichever the data enable signals are. The parallel capture mode can sample the sensor data only one time out of two. This is particularly useful when the user wants only to sample the luminance Y of a CMOS digital image sensor which outputs a YUV422 data stream. If the HALFS bit is set to zero in PIO_PCMR, the parallel capture mode samples the sensor data in the conditions described above. If the HALFS bit is set to one in PIO_PCMR, the parallel capture mode samples the sensor data in the conditions described above, but only one time out of two. Depending on the FRSTS bit in PIO_PCMR, the sensor can either sample the even or odd sensor data. If sensor data are numbered in the order that they are received with an index from zero to n, if FRSTS equals zero then only data with an even index are sampled. If FRSTS equals one, then only data with an odd index are sampled. If data is ready in PIO_PCRHR and it is not read before a new data is stored in PIO_PCRHR, then an overrun error occurs. The previous data is lost and the OVRE flag in PIO_PCISR is set to one. This flag is automatically reset when PIO_PCISR is read (reset after read). The flags DRDY, OVRE, ENDRX and RXBUFF can be a source of the PIO interrupt. Figure 31-9. Parallel Capture Mode Waveforms (DSIZE = 2, ALWYS = 0, HALFS = 0) MCK PIODCLK PIODC[7:0] 0x01 0x12 0x23 0x34 0x45 0x56 0x67 0x78 0x89 PIODCEN1 PIODCEN2 DRDY (PIO_PCISR) Read of PIO_PCISR RDATA (PIO_PCRHR) 0x5645_3423 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 579 Figure 31-10. Parallel Capture Mode Waveforms (DSIZE = 2, ALWYS = 1, HALFS = 0) MCK PIODCLK PIODC[7:0] 0x01 0x12 0x23 0x34 0x45 0x56 0x67 0x78 0x89 PIODCEN1 PIODCEN2 DRDY (PIO_PCISR) Read of PIO_PCISR 0x3423_1201 RDATA (PIO_PCRHR) 0x7867_5645 Figure 31-11. Parallel Capture Mode Waveforms (DSIZE = 2, ALWYS = 0, HALFS = 1, FRSTS = 0) MCK PIODCLK PIODC[7:0] 0x01 0x12 0x23 0x34 0x45 0x56 0x67 0x78 0x89 PIODCEN1 PIODCEN2 DRDY (PIO_PCISR) Read of PIO_PCISR RDATA (PIO_PCRHR) 580 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 0x6745_2301 Figure 31-12. Parallel Capture Mode Waveforms (DSIZE = 2, ALWYS = 0, HALFS = 1, FRSTS = 1) MCK PIODCLK PIODC[7:0] 0x01 0x12 0x23 0x34 0x45 0x56 0x67 0x78 0x89 PIODCEN1 PIODCEN2 DRDY (PIO_PCISR) Read of PIO_PCISR RDATA (PIO_PCRHR) 31.5.13.3 0x7856_3412 Restrictions Configuration fields DSIZE, ALWYS, HALFS and FRSTS in PIO_PCMR can be changed ONLY if the parallel capture mode is disabled at this time (PCEN = 0 in PIO_PCMR). The frequency of peripheral clock must be strictly superior to two times the frequency of the clock of the device which generates the parallel data. 31.5.13.4 Programming Sequence Without PDC 1. Write PIO_PCIDR and PIO_PCIER in order to configure the parallel capture mode interrupt mask. 2. Write PIO_PCMR to set the fields DSIZE, ALWYS, HALFS and FRSTS in order to configure the parallel capture mode WITHOUT enabling the parallel capture mode. 3. Write PIO_PCMR to set the PCEN bit to one in order to enable the parallel capture mode WITHOUT changing the previous configuration. 4. Wait for a data ready by polling the DRDY flag in PIO_PCISR or by waiting for the corresponding interrupt. 5. Check OVRE flag in PIO_PCISR. 6. Read the data in PIO_PCRHR. 7. If new data are expected, go to step 4. 8. Write PIO_PCMR to set the PCEN bit to zero in order to disable the parallel capture mode WITHOUT changing the previous configuration. With PDC SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 581 1. Write PIO_PCIDR and PIO_PCIER in order to configure the parallel capture mode interrupt mask. 582 2. Configure PDC transfer in PDC registers. 3. Write PIO_PCMR to set the fields DSIZE, ALWYS, HALFS and FRSTS in order to configure the parallel capture mode WITHOUT enabling the parallel capture mode. 4. Write PIO_PCMR to set PCEN bit to one in order to enable the parallel capture mode WITHOUT changing the previous configuration. 5. Wait for end of transfer by waiting for the interrupt corresponding to the flag ENDRX in PIO_PCISR. 6. Check OVRE flag in PIO_PCISR. 7. If a new buffer transfer is expected, go to step 5. 8. Write PIO_PCMR to set the PCEN bit to zero in order to disable the parallel capture mode WITHOUT changing the previous configuration. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.5.14 I/O Lines Programming Example The programming example shown in Table 31-4 is used to obtain the following configuration: 4-bit output port on I/O lines 0 to 3 (should be written in a single write operation), open-drain, with pull-up resistor Four output signals on I/O lines 4 to 7 (to drive LEDs for example), driven high and low, no pull-up resistor, no pull-down resistor Four input signals on I/O lines 8 to 11 (to read push-button states for example), with pull-up resistors, glitch filters and input change interrupts Four input signals on I/O line 12 to 15 to read an external device status (polled, thus no input change interrupt), no pull-up resistor, no glitch filter I/O lines 16 to 19 assigned to peripheral A functions with pull-up resistor I/O lines 20 to 23 assigned to peripheral B functions with pull-down resistor I/O lines 24 to 27 assigned to peripheral C with input change interrupt, no pull-up resistor and no pull-down resistor I/O lines 28 to 31 assigned to peripheral D, no pull-up resistor and no pull-down resistor Table 31-4. Programming Example Register Value to be Written PIO_PER 0x0000_FFFF PIO_PDR 0xFFFF_0000 PIO_OER 0x0000_00FF PIO_ODR 0xFFFF_FF00 PIO_IFER 0x0000_0F00 PIO_IFDR 0xFFFF_F0FF PIO_SODR 0x0000_0000 PIO_CODR 0x0FFF_FFFF PIO_IER 0x0F00_0F00 PIO_IDR 0xF0FF_F0FF PIO_MDER 0x0000_000F PIO_MDDR 0xFFFF_FFF0 PIO_PUDR 0xFFF0_00F0 PIO_PUER 0x000F_FF0F PIO_PPDDR 0xFF0F_FFFF PIO_PPDER 0x00F0_0000 PIO_ABCDSR1 0xF0F0_0000 PIO_ABCDSR2 0xFF00_0000 PIO_OWER 0x0000_000F PIO_OWDR 0x0FFF_ FFF0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 583 31.5.15 Register Write Protection To prevent any single software error from corrupting PIO behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the PIO Write Protection Mode Register (PIO_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the PIO Write Protection Status Register (PIO_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading the PIO_WPSR. The following registers can be write-protected: 584 PIO Enable Register PIO Disable Register PIO Output Enable Register PIO Output Disable Register PIO Input Filter Enable Register PIO Input Filter Disable Register PIO Multi-driver Enable Register PIO Multi-driver Disable Register PIO Pull-Up Disable Register PIO Pull-Up Enable Register PIO Peripheral ABCD Select Register 1 PIO Peripheral ABCD Select Register 2 PIO Output Write Enable Register PIO Output Write Disable Register PIO Pad Pull-Down Disable Register PIO Pad Pull-Down Enable Register PIO Parallel Capture Mode Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6 Parallel Input/Output Controller (PIO) User Interface Each I/O line controlled by the PIO Controller is associated with a bit in each of the PIO Controller User Interface registers. Each register is 32-bit wide. If a parallel I/O line is not defined, writing to the corresponding bits has no effect. Undefined bits read zero. If the I/O line is not multiplexed with any peripheral, the I/O line is controlled by the PIO Controller and PIO_PSR returns one systematically. Table 31-5. Register Mapping Offset Register Name Access Reset 0x0000 PIO Enable Register PIO_PER Write-only - 0x0004 PIO Disable Register PIO_PDR Write-only - Read-only (1) - - 0x0008 PIO Status Register PIO_PSR 0x000C Reserved - 0x0010 Output Enable Register PIO_OER Write-only - 0x0014 Output Disable Register PIO_ODR Write-only - 0x0018 Output Status Register PIO_OSR Read-only 0x00000000 0x001C Reserved - - - 0x0020 Glitch Input Filter Enable Register PIO_IFER Write-only - 0x0024 Glitch Input Filter Disable Register PIO_IFDR Write-only - 0x0028 Glitch Input Filter Status Register PIO_IFSR Read-only 0x00000000 0x002C Reserved - - - 0x0030 Set Output Data Register PIO_SODR Write-only - 0x0034 Clear Output Data Register PIO_CODR Write-only 0x0038 Output Data Status Register PIO_ODSR Read-only or(2) Read/Write - 0x003C Pin Data Status Register PIO_PDSR Read-only (3) 0x0040 Interrupt Enable Register PIO_IER Write-only - 0x0044 Interrupt Disable Register PIO_IDR Write-only - 0x0048 Interrupt Mask Register PIO_IMR Read-only 0x00000000 (4) 0x004C Interrupt Status Register PIO_ISR Read-only 0x00000000 0x0050 Multi-driver Enable Register PIO_MDER Write-only - 0x0054 Multi-driver Disable Register PIO_MDDR Write-only - 0x0058 Multi-driver Status Register PIO_MDSR Read-only 0x00000000 0x005C Reserved - - - 0x0060 Pull-up Disable Register PIO_PUDR Write-only - 0x0064 Pull-up Enable Register PIO_PUER Write-only - 0x0068 Pad Pull-up Status Register PIO_PUSR Read-only (1) 0x006C Reserved - - - SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 585 Table 31-5. Register Mapping (Continued) Offset Register Name Access Reset 0x0070 Peripheral Select Register 1 PIO_ABCDSR1 Read/Write 0x00000000 0x0074 Peripheral Select Register 2 PIO_ABCDSR2 Read/Write 0x00000000 0x0078-0x007C Reserved - - - 0x0080 Input Filter Slow Clock Disable Register PIO_IFSCDR Write-only - 0x0084 Input Filter Slow Clock Enable Register PIO_IFSCER Write-only - 0x0088 Input Filter Slow Clock Status Register PIO_IFSCSR Read-only 0x00000000 0x008C Slow Clock Divider Debouncing Register PIO_SCDR Read/Write 0x00000000 0x0090 Pad Pull-down Disable Register PIO_PPDDR Write-only - 0x0094 Pad Pull-down Enable Register PIO_PPDER Write-only - Read-only (1) - - 0x0098 Pad Pull-down Status Register PIO_PPDSR 0x009C Reserved - 0x00A0 Output Write Enable PIO_OWER Write-only - 0x00A4 Output Write Disable PIO_OWDR Write-only - 0x00A8 Output Write Status Register PIO_OWSR Read-only 0x00000000 0x00AC Reserved - - - 0x00B0 Additional Interrupt Modes Enable Register PIO_AIMER Write-only - 0x00B4 Additional Interrupt Modes Disable Register PIO_AIMDR Write-only - 0x00B8 Additional Interrupt Modes Mask Register PIO_AIMMR Read-only 0x00000000 0x00BC Reserved - - - 0x00C0 Edge Select Register PIO_ESR Write-only - 0x00C4 Level Select Register PIO_LSR Write-only - 0x00C8 Edge/Level Status Register PIO_ELSR Read-only 0x00000000 0x00CC Reserved - - - 0x00D0 Falling Edge/Low-Level Select Register PIO_FELLSR Write-only - 0x00D4 Rising Edge/High-Level Select Register PIO_REHLSR Write-only - 0x00D8 Fall/Rise - Low/High Status Register PIO_FRLHSR Read-only 0x00000000 0x00DC Reserved - - - 0x00E0 Lock Status PIO_LOCKSR Read-only 0x00000000 0x00E4 Write Protection Mode Register PIO_WPMR Read/Write 0x00000000 0x00E8 Write Protection Status Register PIO_WPSR Read-only 0x00000000 0x00EC-0x00FC Reserved - - - 0x0100 Schmitt Trigger Register PIO_SCHMITT Read/Write 0x00000000 0x0104-0x010C Reserved - - - 0x0110 Reserved - - - 0x0114-0x011C Reserved - - - 0x0120-0x014C Reserved - 0x0150 Parallel Capture Mode Register PIO_PCMR 586 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 - - Read/Write 0x00000000 Table 31-5. Register Mapping (Continued) Offset Register Name Access Reset 0x0154 Parallel Capture Interrupt Enable Register PIO_PCIER Write-only - 0x0158 Parallel Capture Interrupt Disable Register PIO_PCIDR Write-only - 0x015C Parallel Capture Interrupt Mask Register PIO_PCIMR Read-only 0x00000000 0x0160 Parallel Capture Interrupt Status Register PIO_PCISR Read-only 0x00000000 0x0164 Parallel Capture Reception Holding Register PIO_PCRHR Read-only 0x00000000 0x0168-0x018C Reserved for PDC Registers - - - Notes: 1. Reset value depends on the product implementation. 2. PIO_ODSR is Read-only or Read/Write depending on PIO_OWSR I/O lines. 3. Reset value of PIO_PDSR depends on the level of the I/O lines. Reading the I/O line levels requires the clock of the PIO Controller to be enabled, otherwise PIO_PDSR reads the levels present on the I/O line at the time the clock was disabled. 4. PIO_ISR is reset at 0x0. However, the first read of the register may read a different value as input changes may have occurred. 5. If an offset is not listed in the table it must be considered as reserved. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 587 31.6.1 PIO Enable Register Name: PIO_PER Address: 0x400E0E00 (PIOA), 0x400E1000 (PIOB), 0x400E1200 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: PIO Enable 0: No effect. 1: Enables the PIO to control the corresponding pin (disables peripheral control of the pin). 588 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.2 PIO Disable Register Name: PIO_PDR Address: 0x400E0E04 (PIOA), 0x400E1004 (PIOB), 0x400E1204 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: PIO Disable 0: No effect. 1: Disables the PIO from controlling the corresponding pin (enables peripheral control of the pin). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 589 31.6.3 PIO Status Register Name: PIO_PSR Address: 0x400E0E08 (PIOA), 0x400E1008 (PIOB), 0x400E1208 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: PIO Status 0: PIO is inactive on the corresponding I/O line (peripheral is active). 1: PIO is active on the corresponding I/O line (peripheral is inactive). 590 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.4 PIO Output Enable Register Name: PIO_OER Address: 0x400E0E10 (PIOA), 0x400E1010 (PIOB), 0x400E1210 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Output Enable 0: No effect. 1: Enables the output on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 591 31.6.5 PIO Output Disable Register Name: PIO_ODR Address: 0x400E0E14 (PIOA), 0x400E1014 (PIOB), 0x400E1214 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Output Disable 0: No effect. 1: Disables the output on the I/O line. 592 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.6 PIO Output Status Register Name: PIO_OSR Address: 0x400E0E18 (PIOA), 0x400E1018 (PIOB), 0x400E1218 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Output Status 0: The I/O line is a pure input. 1: The I/O line is enabled in output. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 593 31.6.7 PIO Input Filter Enable Register Name: PIO_IFER Address: 0x400E0E20 (PIOA), 0x400E1020 (PIOB), 0x400E1220 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Input Filter Enable 0: No effect. 1: Enables the input glitch filter on the I/O line. 594 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.8 PIO Input Filter Disable Register Name: PIO_IFDR Address: 0x400E0E24 (PIOA), 0x400E1024 (PIOB), 0x400E1224 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Input Filter Disable 0: No effect. 1: Disables the input glitch filter on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 595 31.6.9 PIO Input Filter Status Register Name: PIO_IFSR Address: 0x400E0E28 (PIOA), 0x400E1028 (PIOB), 0x400E1228 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Input Filter Status 0: The input glitch filter is disabled on the I/O line. 1: The input glitch filter is enabled on the I/O line. 596 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.10 PIO Set Output Data Register Name: PIO_SODR Address: 0x400E0E30 (PIOA), 0x400E1030 (PIOB), 0x400E1230 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Set Output Data 0: No effect. 1: Sets the data to be driven on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 597 31.6.11 PIO Clear Output Data Register Name: PIO_CODR Address: 0x400E0E34 (PIOA), 0x400E1034 (PIOB), 0x400E1234 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Clear Output Data 0: No effect. 1: Clears the data to be driven on the I/O line. 598 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.12 PIO Output Data Status Register Name: PIO_ODSR Address: 0x400E0E38 (PIOA), 0x400E1038 (PIOB), 0x400E1238 (PIOC) Access: Read-only or Read/Write 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Output Data Status 0: The data to be driven on the I/O line is 0. 1: The data to be driven on the I/O line is 1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 599 31.6.13 PIO Pin Data Status Register Name: PIO_PDSR Address: 0x400E0E3C (PIOA), 0x400E103C (PIOB), 0x400E123C (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Output Data Status 0: The I/O line is at level 0. 1: The I/O line is at level 1. 600 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.14 PIO Interrupt Enable Register Name: PIO_IER Address: 0x400E0E40 (PIOA), 0x400E1040 (PIOB), 0x400E1240 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Input Change Interrupt Enable 0: No effect. 1: Enables the input change interrupt on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 601 31.6.15 PIO Interrupt Disable Register Name: PIO_IDR Address: 0x400E0E44 (PIOA), 0x400E1044 (PIOB), 0x400E1244 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Input Change Interrupt Disable 0: No effect. 1: Disables the input change interrupt on the I/O line. 602 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.16 PIO Interrupt Mask Register Name: PIO_IMR Address: 0x400E0E48 (PIOA), 0x400E1048 (PIOB), 0x400E1248 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Input Change Interrupt Mask 0: Input change interrupt is disabled on the I/O line. 1: Input change interrupt is enabled on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 603 31.6.17 PIO Interrupt Status Register Name: PIO_ISR Address: 0x400E0E4C (PIOA), 0x400E104C (PIOB), 0x400E124C (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Input Change Interrupt Status 0: No input change has been detected on the I/O line since PIO_ISR was last read or since reset. 1: At least one input change has been detected on the I/O line since PIO_ISR was last read or since reset. 604 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.18 PIO Multi-driver Enable Register Name: PIO_MDER Address: 0x400E0E50 (PIOA), 0x400E1050 (PIOB), 0x400E1250 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Multi-drive Enable 0: No effect. 1: Enables multi-drive on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 605 31.6.19 PIO Multi-driver Disable Register Name: PIO_MDDR Address: 0x400E0E54 (PIOA), 0x400E1054 (PIOB), 0x400E1254 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Multi-drive Disable 0: No effect. 1: Disables multi-drive on the I/O line. 606 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.20 PIO Multi-driver Status Register Name: PIO_MDSR Address: 0x400E0E58 (PIOA), 0x400E1058 (PIOB), 0x400E1258 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Multi-drive Status 0: The multi-drive is disabled on the I/O line. The pin is driven at high- and low-level. 1: The multi-drive is enabled on the I/O line. The pin is driven at low-level only. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 607 31.6.21 PIO Pull-Up Disable Register Name: PIO_PUDR Address: 0x400E0E60 (PIOA), 0x400E1060 (PIOB), 0x400E1260 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Pull-Up Disable 0: No effect. 1: Disables the pull-up resistor on the I/O line. 608 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.22 PIO Pull-Up Enable Register Name: PIO_PUER Address: 0x400E0E64 (PIOA), 0x400E1064 (PIOB), 0x400E1264 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Pull-Up Enable 0: No effect. 1: Enables the pull-up resistor on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 609 31.6.23 PIO Pull-Up Status Register Name: PIO_PUSR Address: 0x400E0E68 (PIOA), 0x400E1068 (PIOB), 0x400E1268 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Pull-Up Status 0: Pull-up resistor is enabled on the I/O line. 1: Pull-up resistor is disabled on the I/O line. 610 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.24 PIO Peripheral ABCD Select Register 1 Name: PIO_ABCDSR1 Access: Read/Write 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Peripheral Select If the same bit is set to 0 in PIO_ABCDSR2: 0: Assigns the I/O line to the Peripheral A function. 1: Assigns the I/O line to the Peripheral B function. If the same bit is set to 1 in PIO_ABCDSR2: 0: Assigns the I/O line to the Peripheral C function. 1: Assigns the I/O line to the Peripheral D function. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 611 31.6.25 PIO Peripheral ABCD Select Register 2 Name: PIO_ABCDSR2 Access: Read/Write 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Peripheral Select If the same bit is set to 0 in PIO_ABCDSR1: 0: Assigns the I/O line to the Peripheral A function. 1: Assigns the I/O line to the Peripheral C function. If the same bit is set to 1 in PIO_ABCDSR1: 0: Assigns the I/O line to the Peripheral B function. 1: Assigns the I/O line to the Peripheral D function. 612 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.26 PIO Input Filter Slow Clock Disable Register Name: PIO_IFSCDR Address: 0x400E0E80 (PIOA), 0x400E1080 (PIOB), 0x400E1280 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Peripheral Clock Glitch Filtering Select 0: No effect. 1: The glitch filter is able to filter glitches with a duration < tperipheral clock/2. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 613 31.6.27 PIO Input Filter Slow Clock Enable Register Name: PIO_IFSCER Address: 0x400E0E84 (PIOA), 0x400E1084 (PIOB), 0x400E1284 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Slow Clock Debouncing Filtering Select 0: No effect. 1: The debouncing filter is able to filter pulses with a duration < tdiv_slck/2. 614 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.28 PIO Input Filter Slow Clock Status Register Name: PIO_IFSCSR Address: 0x400E0E88 (PIOA), 0x400E1088 (PIOB), 0x400E1288 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Glitch or Debouncing Filter Selection Status 0: The glitch filter is able to filter glitches with a duration < tperipheral clock/2. 1: The debouncing filter is able to filter pulses with a duration < tdiv_slck/2. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 615 31.6.29 PIO Slow Clock Divider Debouncing Register Name: PIO_SCDR Address: 0x400E0E8C (PIOA), 0x400E108C (PIOB), 0x400E128C (PIOC) Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 2 1 0 - - 7 6 DIV 5 4 3 DIV * DIV: Slow Clock Divider Selection for Debouncing tdiv_slck = ((DIV + 1) x 2) x tslck 616 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.30 PIO Pad Pull-Down Disable Register Name: PIO_PPDDR Address: 0x400E0E90 (PIOA), 0x400E1090 (PIOB), 0x400E1290 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Pull-Down Disable 0: No effect. 1: Disables the pull-down resistor on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 617 31.6.31 PIO Pad Pull-Down Enable Register Name: PIO_PPDER Address: 0x400E0E94 (PIOA), 0x400E1094 (PIOB), 0x400E1294 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Pull-Down Enable 0: No effect. 1: Enables the pull-down resistor on the I/O line. 618 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.32 PIO Pad Pull-Down Status Register Name: PIO_PPDSR Address: 0x400E0E98 (PIOA), 0x400E1098 (PIOB), 0x400E1298 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Pull-Down Status 0: Pull-down resistor is enabled on the I/O line. 1: Pull-down resistor is disabled on the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 619 31.6.33 PIO Output Write Enable Register Name: PIO_OWER Address: 0x400E0EA0 (PIOA), 0x400E10A0 (PIOB), 0x400E12A0 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Output Write Enable 0: No effect. 1: Enables writing PIO_ODSR for the I/O line. 620 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.34 PIO Output Write Disable Register Name: PIO_OWDR Address: 0x400E0EA4 (PIOA), 0x400E10A4 (PIOB), 0x400E12A4 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * P0-P31: Output Write Disable 0: No effect. 1: Disables writing PIO_ODSR for the I/O line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 621 31.6.35 PIO Output Write Status Register Name: PIO_OWSR Address: 0x400E0EA8 (PIOA), 0x400E10A8 (PIOB), 0x400E12A8 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Output Write Status 0: Writing PIO_ODSR does not affect the I/O line. 1: Writing PIO_ODSR affects the I/O line. 622 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.36 PIO Additional Interrupt Modes Enable Register Name: PIO_AIMER Address: 0x400E0EB0 (PIOA), 0x400E10B0 (PIOB), 0x400E12B0 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Additional Interrupt Modes Enable 0: No effect. 1: The interrupt source is the event described in PIO_ELSR and PIO_FRLHSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 623 31.6.37 PIO Additional Interrupt Modes Disable Register Name: PIO_AIMDR Address: 0x400E0EB4 (PIOA), 0x400E10B4 (PIOB), 0x400E12B4 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Additional Interrupt Modes Disable 0: No effect. 1: The interrupt mode is set to the default interrupt mode (both-edge detection). 624 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.38 PIO Additional Interrupt Modes Mask Register Name: PIO_AIMMR Address: 0x400E0EB8 (PIOA), 0x400E10B8 (PIOB), 0x400E12B8 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: IO Line Index Selects the IO event type triggering an interrupt. 0: The interrupt source is a both-edge detection event. 1: The interrupt source is described by the registers PIO_ELSR and PIO_FRLHSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 625 31.6.39 PIO Edge Select Register Name: PIO_ESR Address: 0x400E0EC0 (PIOA), 0x400E10C0 (PIOB), 0x400E12C0 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Edge Interrupt Selection 0: No effect. 1: The interrupt source is an edge-detection event. 626 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.40 PIO Level Select Register Name: PIO_LSR Address: 0x400E0EC4 (PIOA), 0x400E10C4 (PIOB), 0x400E12C4 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Level Interrupt Selection 0: No effect. 1: The interrupt source is a level-detection event. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 627 31.6.41 PIO Edge/Level Status Register Name: PIO_ELSR Address: 0x400E0EC8 (PIOA), 0x400E10C8 (PIOB), 0x400E12C8 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Edge/Level Interrupt Source Selection 0: The interrupt source is an edge-detection event. 1: The interrupt source is a level-detection event. 628 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.42 PIO Falling Edge/Low-Level Select Register Name: PIO_FELLSR Address: 0x400E0ED0 (PIOA), 0x400E10D0 (PIOB), 0x400E12D0 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Falling Edge/Low-Level Interrupt Selection 0: No effect. 1: The interrupt source is set to a falling edge detection or low-level detection event, depending on PIO_ELSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 629 31.6.43 PIO Rising Edge/High-Level Select Register Name: PIO_REHLSR Address: 0x400E0ED4 (PIOA), 0x400E10D4 (PIOB), 0x400E12D4 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Rising Edge/High-Level Interrupt Selection 0: No effect. 1: The interrupt source is set to a rising edge detection or high-level detection event, depending on PIO_ELSR. 630 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.44 PIO Fall/Rise - Low/High Status Register Name: PIO_FRLHSR Address: 0x400E0ED8 (PIOA), 0x400E10D8 (PIOB), 0x400E12D8 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Edge/Level Interrupt Source Selection 0: The interrupt source is a falling edge detection (if PIO_ELSR = 0) or low-level detection event (if PIO_ELSR = 1). 1: The interrupt source is a rising edge detection (if PIO_ELSR = 0) or high-level detection event (if PIO_ELSR = 1). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 631 31.6.45 PIO Lock Status Register Name: PIO_LOCKSR Address: 0x400E0EE0 (PIOA), 0x400E10E0 (PIOB), 0x400E12E0 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 P31 P30 P29 P28 P27 P26 P25 P24 23 22 21 20 19 18 17 16 P23 P22 P21 P20 P19 P18 P17 P16 15 14 13 12 11 10 9 8 P15 P14 P13 P12 P11 P10 P9 P8 7 6 5 4 3 2 1 0 P7 P6 P5 P4 P3 P2 P1 P0 * P0-P31: Lock Status 0: The I/O line is not locked. 1: The I/O line is locked. 632 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.46 PIO Write Protection Mode Register Name: PIO_WPMR Address: 0x400E0EE4 (PIOA), 0x400E10E4 (PIOB), 0x400E12E4 (PIOC) Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 6 5 4 3 2 1 0 - - - - - - - WPEN * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x50494F ("PIO" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x50494F ("PIO" in ASCII). See Section 31.5.15 "Register Write Protection" for the list of registers that can be protected. * WPKEY: Write Protection Key Value Name 0x50494F PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 633 31.6.47 PIO Write Protection Status Register Name: PIO_WPSR Address: 0x400E0EE8 (PIOA), 0x400E10E8 (PIOB), 0x400E12E8 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 11 10 9 8 WPVSRC 15 14 13 12 WPVSRC 7 6 5 4 3 2 1 0 - - - - - - - WPVS * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the PIO_WPSR. 1: A write protection violation has occurred since the last read of the PIO_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. 634 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.48 PIO Schmitt Trigger Register Name: PIO_SCHMITT Address: 0x400E0F00 (PIOA), 0x400E1100 (PIOB), 0x400E1300 (PIOC) Access: Read/Write 31 30 29 28 27 26 25 24 SCHMITT31 SCHMITT30 SCHMITT29 SCHMITT28 SCHMITT27 SCHMITT26 SCHMITT25 SCHMITT24 23 22 21 20 19 18 17 16 SCHMITT23 SCHMITT22 SCHMITT21 SCHMITT20 SCHMITT19 SCHMITT18 SCHMITT17 SCHMITT16 15 14 13 12 11 10 9 8 SCHMITT15 SCHMITT14 SCHMITT13 SCHMITT12 SCHMITT11 SCHMITT10 SCHMITT9 SCHMITT8 7 6 5 4 3 2 1 0 SCHMITT7 SCHMITT6 SCHMITT5 SCHMITT4 SCHMITT3 SCHMITT2 SCHMITT1 SCHMITT0 * SCHMITTx [x=0..31]: Schmitt Trigger Control 0: Schmitt trigger is enabled. 1: Schmitt trigger is disabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 635 31.6.49 PIO Parallel Capture Mode Register Name: PIO_PCMR Address: 0x400E0F50 (PIOA), 0x400E1150 (PIOB), 0x400E1350 (PIOC) Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - FRSTS HALFS ALWYS - 7 6 5 - - 4 DSIZE 3 2 1 0 - - - PCEN This register can only be written if the WPEN bit is cleared in the PIO Write Protection Mode Register. * PCEN: Parallel Capture Mode Enable 0: The parallel capture mode is disabled. 1: The parallel capture mode is enabled. * DSIZE: Parallel Capture Mode Data Size Value Name Description 0 BYTE The reception data in the PIO_PCRHR is a byte (8-bit) 1 HALF-WORD The reception data in the PIO_PCRHR is a half-word (16-bit) 2 WORD The reception data in the PIO_PCRHR is a word (32-bit) 3 - Reserved * ALWYS: Parallel Capture Mode Always Sampling 0: The parallel capture mode samples the data when both data enables are active. 1: The parallel capture mode samples the data whatever the data enables are. * HALFS: Parallel Capture Mode Half Sampling Independently from the ALWYS bit: 0: The parallel capture mode samples all the data. 1: The parallel capture mode samples the data only every other time. * FRSTS: Parallel Capture Mode First Sample This bit is useful only if the HALFS bit is set to 1. If data are numbered in the order that they are received with an index from 0 to n: 0: Only data with an even index are sampled. 1: Only data with an odd index are sampled. 636 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.50 PIO Parallel Capture Interrupt Enable Register Name: PIO_PCIER Address: 0x400E0F54 (PIOA), 0x400E1154 (PIOB), 0x400E1354 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - RXBUFF ENDRX OVRE DRDY The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Enables the corresponding interrupt * DRDY: Parallel Capture Mode Data Ready Interrupt Enable * OVRE: Parallel Capture Mode Overrun Error Interrupt Enable * ENDRX: End of Reception Transfer Interrupt Enable * RXBUFF: Reception Buffer Full Interrupt Enable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 637 31.6.51 PIO Parallel Capture Interrupt Disable Register Name: PIO_PCIDR Address: 0x400E0F58 (PIOA), 0x400E1158 (PIOB), 0x400E1358 (PIOC) Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - RXBUFF ENDRX OVRE DRDY The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Disables the corresponding interrupt * DRDY: Parallel Capture Mode Data Ready Interrupt Disable * OVRE: Parallel Capture Mode Overrun Error Interrupt Disable * ENDRX: End of Reception Transfer Interrupt Disable * RXBUFF: Reception Buffer Full Interrupt Disable 638 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.52 PIO Parallel Capture Interrupt Mask Register Name: PIO_PCIMR Address: 0x400E0F5C (PIOA), 0x400E115C (PIOB), 0x400E135C (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - RXBUFF ENDRX OVRE DRDY The following configuration values are valid for all listed bit names of this register: 0: Corresponding interrupt is not enabled. 1: Corresponding interrupt is enabled. * DRDY: Parallel Capture Mode Data Ready Interrupt Mask * OVRE: Parallel Capture Mode Overrun Error Interrupt Mask * ENDRX: End of Reception Transfer Interrupt Mask * RXBUFF: Reception Buffer Full Interrupt Mask SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 639 31.6.53 PIO Parallel Capture Interrupt Status Register Name: PIO_PCISR Address: 0x400E0F60 (PIOA), 0x400E1160 (PIOB), 0x400E1360 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 - - - - RXBUFF ENDRX OVRE DRDY * DRDY: Parallel Capture Mode Data Ready 0: No new data is ready to be read since the last read of PIO_PCRHR. 1: A new data is ready to be read since the last read of PIO_PCRHR. The DRDY flag is automatically reset when PIO_PCRHR is read or when the parallel capture mode is disabled. * OVRE: Parallel Capture Mode Overrun Error 0: No overrun error occurred since the last read of this register. 1: At least one overrun error occurred since the last read of this register. The OVRE flag is automatically reset when this register is read or when the parallel capture mode is disabled. * ENDRX: End of Reception Transfer 0: The End of Transfer signal from the reception PDC channel is inactive. 1: The End of Transfer signal from the reception PDC channel is active. * RXBUFF: Reception Buffer Full 0: The signal Buffer Full from the reception PDC channel is inactive. 1: The signal Buffer Full from the reception PDC channel is active. 640 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 31.6.54 PIO Parallel Capture Reception Holding Register Name: PIO_PCRHR Address: 0x400E0F64 (PIOA), 0x400E1164 (PIOB), 0x400E1364 (PIOC) Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RDATA 23 22 21 20 RDATA 15 14 13 12 RDATA 7 6 5 4 RDATA * RDATA: Parallel Capture Mode Reception Data If DSIZE = 0 in PIO_PCMR, only the 8 LSBs of RDATA are useful. If DSIZE = 1 in PIO_PCMR, only the 16 LSBs of RDATA are useful. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 641 32. Synchronous Serial Controller (SSC) 32.1 Description The Synchronous Serial Controller (SSC) provides a synchronous communication link with external devices. It supports many serial synchronous communication protocols generally used in audio and telecom applications such as I2S, Short Frame Sync, Long Frame Sync, etc. The SSC contains an independent receiver and transmitter and a common clock divider. The receiver and the transmitter each interface with three signals: the TD/RD signal for data, the TK/RK signal for the clock and the TF/RF signal for the Frame Sync. The transfers can be programmed to start automatically or on different events detected on the Frame Sync signal. The SSC high-level of programmability and its two dedicated PDC channels of up to 32 bits permit a continuous high bit rate data transfer without processor intervention. Featuring connection to two PDC channels, the SSC permits interfacing with low processor overhead to the following: 642 Codecs in master or slave mode DAC through dedicated serial interface, particularly I2S Magnetic card reader SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.2 32.3 Embedded Characteristics Provides Serial Synchronous Communication Links Used in Audio and Telecom Applications Contains an Independent Receiver and Transmitter and a Common Clock Divider Interfaced with Two PDC Channels (DMA Access) to Reduce Processor Overhead Offers a Configurable Frame Sync and Data Length Receiver and Transmitter Can be Programmed to Start Automatically or on Detection of Different Events on the Frame Sync Signal Receiver and Transmitter Include a Data Signal, a Clock Signal and a Frame Synchronization Signal Block Diagram Figure 32-1. Block Diagram System Bus Peripheral Bridge PDC Bus Clock Peripheral Bus TF TK PMC TD Peripheral Clock PIO SSC Interface RF RK Interrupt Control RD SSC Interrupt 32.4 Application Block Diagram Figure 32-2. Application Block Diagram OS or RTOS Driver Power Management Interrupt Management Test Management SSC Serial AUDIO Codec Time Slot Management Frame Management Line Interface SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 643 32.5 SSC Application Examples The SSC can support several serial communication modes used in audio or high speed serial links. Some standard applications are shown in the following figures. All serial link applications supported by the SSC are not listed here. Figure 32-3. Audio Application Block Diagram Clock SCK TK Word Select WS I2S RECEIVER TF Data SD TD SSC RD Clock SCK RF Word Select WS RK MSB Data SD LSB Right Channel Left Channel Figure 32-4. Codec Application Block Diagram Serial Data Clock (SCLK) TK Frame sync (FSYNC) TF Serial Data Out CODEC TD SSC Serial Data In RD RF Serial Data Clock (SCLK) RK Frame sync (FSYNC) First Time Slot Dstart Serial Data Out Serial Data In 644 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 MSB Dend Figure 32-5. Time Slot Application Block Diagram SCLK TK FSYNC TF CODEC First Time Slot Data Out TD SSC RD Data In RF RK CODEC Second Time Slot Serial Data Clock (SCLK) Frame sync (FSYNC) First Time Slot Second Time Slot Dstart Dend Serial Data Out Serial Data in 32.6 Pin Name List Table 32-1. 32.7 I/O Lines Description Pin Name Pin Description Type RF Receiver Frame Synchro Input/Output RK Receiver Clock Input/Output RD Receiver Data Input TF Transmitter Frame Synchro Input/Output TK Transmitter Clock Input/Output TD Transmitter Data Output Product Dependencies 32.7.1 I/O Lines The pins used for interfacing the compliant external devices may be multiplexed with PIO lines. Before using the SSC receiver, the PIO controller must be configured to dedicate the SSC receiver I/O lines to the SSC peripheral mode. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 645 Before using the SSC transmitter, the PIO controller must be configured to dedicate the SSC transmitter I/O lines to the SSC peripheral mode. Table 32-2. I/O Lines Instance Signal I/O Line Peripheral SSC RD PA18 A SSC RF PA20 A SSC RK PA19 A SSC TD PA17 A SSC TF PA15 A SSC TK PA16 A 32.7.2 Power Management The SSC is not continuously clocked. The SSC interface may be clocked through the Power Management Controller (PMC), therefore the programmer must first configure the PMC to enable the SSC clock. 32.7.3 Interrupt The SSC interface has an interrupt line connected to the interrupt controller. Handling interrupts requires programming the interrupt controller before configuring the SSC. All SSC interrupts can be enabled/disabled configuring the SSC Interrupt Mask Register. Each pending and Table 32-3. Peripheral IDs Instance ID SSC 22 unmasked SSC interrupt will assert the SSC interrupt line. The SSC interrupt service routine can get the interrupt origin by reading the SSC Interrupt Status Register. 646 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.8 Functional Description This chapter contains the functional description of the following: SSC Functional Block, Clock Management, Data format, Start, Transmitter, Receiver and Frame Sync. The receiver and transmitter operate separately. However, they can work synchronously by programming the receiver to use the transmit clock and/or to start a data transfer when transmission starts. Alternatively, this can be done by programming the transmitter to use the receive clock and/or to start a data transfer when reception starts. The transmitter and the receiver can be programmed to operate with the clock signals provided on either the TK or RK pins. This allows the SSC to support many slave-mode data transfers. The maximum clock speed allowed on the TK and RK pins is the peripheral clock divided by 2. Figure 32-6. SSC Functional Block Diagram Transmitter Peripheral Clock TK Input Clock Divider Transmit Clock Controller RX clock TXEN RX Start Start Selector TF TK Frame Sync Controller TF Data Controller TD TX Start Transmit Shift Register Transmit Holding Register APB TX clock Clock Output Controller Transmit Sync Holding Register User Interface Receiver RK Input RK Frame Sync Controller RF Data Controller RD Receive Clock RX Clock Controller TX Clock RXEN TX Start Start RF Selector RC0R Interrupt Control Clock Output Controller RX Start Receive Shift Register Receive Holding Register Receive Sync Holding Register To Interrupt Controller SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 647 32.8.1 Clock Management The transmitter clock can be generated by: an external clock received on the TK I/O pad the receiver clock the internal clock divider The receiver clock can be generated by: an external clock received on the RK I/O pad the transmitter clock the internal clock divider Furthermore, the transmitter block can generate an external clock on the TK I/O pad, and the receiver block can generate an external clock on the RK I/O pad. This allows the SSC to support many Master and Slave Mode data transfers. 32.8.1.1 Clock Divider Figure 32-7. Divided Clock Block Diagram Clock Divider SSC_CMR Peripheral Clock /2 12-bit Counter Divided Clock The peripheral clock divider is determined by the 12-bit field DIV counter and comparator (so its maximal value is 4095) in the Clock Mode Register (SSC_CMR), allowing a peripheral clock division by up to 8190. The Divided Clock is provided to both the Receiver and Transmitter. When this field is programmed to 0, the Clock Divider is not used and remains inactive. When DIV is set to a value equal to or greater than 1, the Divided Clock has a frequency of peripheral clock divided by 2 times DIV. Each level of the Divided Clock has a duration of the peripheral clock multiplied by DIV. This ensures a 50% duty cycle for the Divided Clock regardless of whether the DIV value is even or odd. Figure 32-8. Divided Clock Generation Peripheral Clock Divided Clock DIV = 1 Divided Clock Frequency = fperipheral clock/2 Peripheral Clock Divided Clock DIV = 3 Divided Clock Frequency = fperipheral clock/6 648 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.8.1.2 Transmitter Clock Management The transmitter clock is generated from the receiver clock or the divider clock or an external clock scanned on the TK I/O pad. The transmitter clock is selected by the CKS field in the Transmit Clock Mode Register (SSC_TCMR). Transmit Clock can be inverted independently by the CKI bits in the SSC_TCMR. The transmitter can also drive the TK I/O pad continuously or be limited to the actual data transfer. The clock output is configured by the SSC_TCMR. The Transmit Clock Inversion (CKI) bits have no effect on the clock outputs. Programming the SSC_TCMR to select TK pin (CKS field) and at the same time Continuous Transmit Clock (CKO field) can lead to unpredictable results. Figure 32-9. Transmitter Clock Management TK (pin) MUX Tri_state Controller Clock Output Receiver Clock Divider Clock CKO CKS Data Transfer INV MUX Tri_state Controller CKI CKG Transmitter Clock SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 649 32.8.1.3 Receiver Clock Management The receiver clock is generated from the transmitter clock or the divider clock or an external clock scanned on the RK I/O pad. The Receive Clock is selected by the CKS field in SSC_RCMR (Receive Clock Mode Register). Receive Clocks can be inverted independently by the CKI bits in SSC_RCMR. The receiver can also drive the RK I/O pad continuously or be limited to the actual data transfer. The clock output is configured by the SSC_RCMR. The Receive Clock Inversion (CKI) bits have no effect on the clock outputs. Programming the SSC_RCMR to select RK pin (CKS field) and at the same time Continuous Receive Clock (CKO field) can lead to unpredictable results. Figure 32-10. Receiver Clock Management RK (pin) MUX Tri_state Controller Clock Output Transmitter Clock Divider Clock CKO CKS 32.8.1.4 Data Transfer INV MUX Tri_state Controller CKI CKG Receiver Clock Serial Clock Ratio Considerations The Transmitter and the Receiver can be programmed to operate with the clock signals provided on either the TK or RK pins. This allows the SSC to support many slave-mode data transfers. In this case, the maximum clock speed allowed on the RK pin is: Peripheral clock divided by 2 if Receiver Frame Synchro is input Peripheral clock divided by 3 if Receiver Frame Synchro is output In addition, the maximum clock speed allowed on the TK pin is: Peripheral clock divided by 6 if Transmit Frame Synchro is input Peripheral clock divided by 2 if Transmit Frame Synchro is output 32.8.2 Transmitter Operations A transmitted frame is triggered by a start event and can be followed by synchronization data before data transmission. The start event is configured by setting the SSC_TCMR. See Section 32.8.4 "Start" on page 652. The frame synchronization is configured setting the Transmit Frame Mode Register (SSC_TFMR). See Section 32.8.5 "Frame Sync" on page 654. To transmit data, the transmitter uses a shift register clocked by the transmitter clock signal and the start mode selected in the SSC_TCMR. Data is written by the application to the SSC_THR then transferred to the shift register according to the data format selected. 650 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 When both the SSC_THR and the transmit shift register are empty, the status flag TXEMPTY is set in the SSC_SR. When the Transmit Holding register is transferred in the transmit shift register, the status flag TXRDY is set in the SSC_SR and additional data can be loaded in the holding register. Figure 32-11. Transmitter Block Diagram SSC_CRTXEN SSC_SRTXEN TXEN SSC_CRTXDIS SSC_RCMR.START SSC_TCMR.START RXEN TXEN TX Start RX Start Start RF Selector RF RC0R SSC_TCMR.STTDLY SSC_TFMR.FSDEN SSC_TFMR.DATNB SSC_TFMR.DATDEF SSC_TFMR.MSBF TX Controller TX Start Start Selector TD Transmit Shift Register SSC_TFMR.FSDEN SSC_TCMR.STTDLY != 0 SSC_TFMR.DATLEN 0 SSC_THR Transmitter Clock 1 SSC_TSHR SSC_TFMR.FSLEN TX Controller counter reached STTDLY 32.8.3 Receiver Operations A received frame is triggered by a start event and can be followed by synchronization data before data transmission. The start event is configured setting the Receive Clock Mode Register (SSC_RCMR). See Section 32.8.4 "Start" on page 652. The frame synchronization is configured setting the Receive Frame Mode Register (SSC_RFMR). See Section 32.8.5 "Frame Sync" on page 654. The receiver uses a shift register clocked by the receiver clock signal and the start mode selected in the SSC_RCMR. The data is transferred from the shift register depending on the data format selected. When the receiver shift register is full, the SSC transfers this data in the holding register, the status flag RXRDY is set in the SSC_SR and the data can be read in the receiver holding register. If another transfer occurs before read of the Receive Holding Register (SSC_RHR), the status flag OVERUN is set in the SSC_SR and the receiver shift register is transferred in the SSC_RHR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 651 Figure 32-12. Receiver Block Diagram SSC_CR.RXEN SSC_SR.RXEN SSC_CR.RXDIS SSC_TCMR.START SSC_RCMR.START TXEN RX Start RF Start Selector RXEN RF RC0R Start Selector SSC_RFMR.MSBF SSC_RFMR.DATNB RX Start RX Controller RD Receive Shift Register SSC_RCMR.STTDLY != 0 load SSC_RSHR load SSC_RFMR.FSLEN SSC_RHR Receiver Clock SSC_RFMR.DATLEN RX Controller counter reached STTDLY 32.8.4 Start The transmitter and receiver can both be programmed to start their operations when an event occurs, respectively in the Transmit Start Selection (START) field of SSC_TCMR and in the Receive Start Selection (START) field of SSC_RCMR. Under the following conditions the start event is independently programmable: Continuous. In this case, the transmission starts as soon as a word is written in SSC_THR and the reception starts as soon as the Receiver is enabled. Synchronously with the transmitter/receiver On detection of a falling/rising edge on TF/RF On detection of a low level/high level on TF/RF On detection of a level change or an edge on TF/RF A start can be programmed in the same manner on either side of the Transmit/Receive Clock Register (SSC_RCMR/SSC_TCMR). Thus, the start could be on TF (Transmit) or RF (Receive). Moreover, the Receiver can start when data is detected in the bit stream with the Compare Functions. Detection on TF/RF input/output is done by the field FSOS of the Transmit/Receive Frame Mode Register (SSC_TFMR/SSC_RFMR). 652 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 32-13. Transmit Start Mode TK TF (Input) Start = Low Level on TF Start = Falling Edge on TF Start = High Level on TF Start = Rising Edge on TF Start = Level Change on TF Start = Any Edge on TF TD (Output) TD (Output) X BO STTDLY BO X B1 STTDLY BO X TD (Output) B1 STTDLY TD (Output) BO X B1 STTDLY TD (Output) TD (Output) B1 BO X B1 BO B1 STTDLY X B1 BO BO B1 STTDLY Figure 32-14. Receive Pulse/Edge Start Modes RK RF (Input) Start = Low Level on RF Start = Falling Edge on RF Start = High Level on RF Start = Rising Edge on RF Start = Level Change on RF Start = Any Edge on RF RD (Input) RD (Input) X BO STTDLY BO X B1 STTDLY RD (Input) BO X B1 STTDLY RD (Input) BO X B1 STTDLY RD (Input) RD (Input) B1 BO X B1 BO B1 STTDLY X BO B1 BO B1 STTDLY SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 653 32.8.5 Frame Sync The Transmitter and Receiver Frame Sync pins, TF and RF, can be programmed to generate different kinds of frame synchronization signals. The Frame Sync Output Selection (FSOS) field in the Receive Frame Mode Register (SSC_RFMR) and in the Transmit Frame Mode Register (SSC_TFMR) are used to select the required waveform. Programmable low or high levels during data transfer are supported. Programmable high levels before the start of data transfers or toggling are also supported. If a pulse waveform is selected, the Frame Sync Length (FSLEN) field in SSC_RFMR and SSC_TFMR programs the length of the pulse, from 1 bit time up to 256 bit times. The periodicity of the Receive and Transmit Frame Sync pulse output can be programmed through the Period Divider Selection (PERIOD) field in SSC_RCMR and SSC_TCMR. 32.8.5.1 Frame Sync Data Frame Sync Data transmits or receives a specific tag during the Frame Sync signal. During the Frame Sync signal, the Receiver can sample the RD line and store the data in the Receive Sync Holding Register and the transmitter can transfer Transmit Sync Holding Register in the shift register. The data length to be sampled/shifted out during the Frame Sync signal is programmed by the FSLEN field in SSC_RFMR/SSC_TFMR and has a maximum value of 256. Concerning the Receive Frame Sync Data operation, if the Frame Sync Length is equal to or lower than the delay between the start event and the actual data reception, the data sampling operation is performed in the Receive Sync Holding Register through the receive shift register. The Transmit Frame Sync Operation is performed by the transmitter only if the bit Frame Sync Data Enable (FSDEN) in SSC_TFMR is set. If the Frame Sync length is equal to or lower than the delay between the start event and the actual data transmission, the normal transmission has priority and the data contained in the Transmit Sync Holding Register is transferred in the Transmit Register, then shifted out. 32.8.5.2 Frame Sync Edge Detection The Frame Sync Edge detection is programmed by the FSEDGE field in SSC_RFMR/SSC_TFMR. This sets the corresponding flags RXSYN/TXSYN in the SSC Status Register (SSC_SR) on frame synchro edge detection (signals RF/TF). 32.8.6 Receive Compare Modes Figure 32-15. Receive Compare Modes RK RD (Input) CMP0 CMP1 CMP2 CMP3 Ignored B0 B1 B2 Start FSLEN 32.8.6.1 STDLY DATLEN Compare Functions The length of the comparison patterns (Compare 0, Compare 1) and thus the number of bits they are compared to is defined by FSLEN, but with a maximum value of 256 bits. Comparison is always done by comparing the last bits received with the comparison pattern. Compare 0 can be one start event of the Receiver. In this case, the receiver compares at each new sample the last bits received at the Compare 0 pattern contained in the Compare 0 Register (SSC_RC0R). When this start event is selected, the user can program the Receiver to start a new data 654 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 transfer either by writing a new Compare 0, or by receiving continuously until Compare 1 occurs. This selection is done with the STOP bit in the SSC_RCMR. 32.8.7 Data Format The data framing format of both the transmitter and the receiver are programmable through the Transmitter Frame Mode Register (SSC_TFMR) and the Receiver Frame Mode Register (SSC_RFMR). In either case, the user can independently select the following parameters: Event that starts the data transfer (START) Delay in number of bit periods between the start event and the first data bit (STTDLY) Length of the data (DATLEN) Number of data to be transferred for each start event (DATNB) Length of synchronization transferred for each start event (FSLEN) Bit sense: most or lowest significant bit first (MSBF) Additionally, the transmitter can be used to transfer synchronization and select the level driven on the TD pin while not in data transfer operation. This is done respectively by the Frame Sync Data Enable (FSDEN) and by the Data Default Value (DATDEF) bits in SSC_TFMR. Table 32-4. Data Frame Registers Transmitter Receiver Field Length Comment SSC_TFMR SSC_RFMR DATLEN Up to 32 Size of word SSC_TFMR SSC_RFMR DATNB Up to 16 Number of words transmitted in frame SSC_TFMR SSC_RFMR MSBF - Most significant bit first SSC_TFMR SSC_RFMR FSLEN Up to 256 Size of Synchro data register SSC_TFMR - DATDE F 0 or 1 Data default value ended SSC_TFMR - FSDEN - Enable send SSC_TSHR SSC_TCMR SSC_RCMR PERIOD Up to 512 Frame size SSC_TCMR SSC_RCMR STTDLY Up to 255 Size of transmit start delay SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 655 Figure 32-16. Transmit and Receive Frame Format in Edge/Pulse Start Modes Start Start PERIOD (1) TF/RF FSLEN TD (If FSDEN = 1) TD (If FSDEN = 0) RD Sync Data Default From SSC_TSHR From DATDEF Data Data Default From SSC_THR From SSC_THR From DATDEF Default Ignored Sync Data Data Data From SSC_THR From DATDEF Data To SSC_RHR To SSC_RHR DATLEN DATLEN STTDLY Default From DATDEF From SSC_THR Data To SSC_RSHR Sync Data Ignored Sync Data DATNB Note: 1. Example of input on falling edge of TF/RF. In the example illustrated in Figure 32-17 "Transmit Frame Format in Continuous Mode (STTDLY = 0)", the SSC_THR is loaded twice. The FSDEN value has no effect on the transmission. SyncData cannot be output in continuous mode. Figure 32-17. Transmit Frame Format in Continuous Mode (STTDLY = 0) Start Data TD Default Data From SSC_THR From SSC_THR DATLEN DATLEN Start: 1. TXEMPTY set to 1 2. Write into the SSC_THR Figure 32-18. Receive Frame Format in Continuous Mode (STTDLY = 0) Start = Enable Receiver RD 656 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Data Data To SSC_RHR To SSC_RHR DATLEN DATLEN 32.8.8 Loop Mode The receiver can be programmed to receive transmissions from the transmitter. This is done by setting the Loop Mode (LOOP) bit in the SSC_RFMR. In this case, RD is connected to TD, RF is connected to TF and RK is connected to TK. 32.8.9 Interrupt Most bits in the SSC_SR have a corresponding bit in interrupt management registers. The SSC can be programmed to generate an interrupt when it detects an event. The interrupt is controlled by writing the Interrupt Enable Register (SSC_IER) and Interrupt Disable Register (SSC_IDR). These registers enable and disable, respectively, the corresponding interrupt by setting and clearing the corresponding bit in the Interrupt Mask Register (SSC_IMR), which controls the generation of interrupts by asserting the SSC interrupt line connected to the interrupt controller. Figure 32-19. Interrupt Block Diagram SSC_IMR SSC_IER PDC SSC_IDR Set Clear TXBUFE ENDTX Transmitter TXRDY TXEMPTY TXSYNC Interrupt Control RXBUFF ENDRX SSC Interrupt Receiver RXRDY OVRUN RXSYNC SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 657 32.8.10 Register Write Protection To prevent any single software error from corrupting AIC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the SSC Write Protection Mode Register (SSC_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the SSC Write Protection Status Register (SSC_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading the SSC_WPSR. The following registers can be write-protected: 658 SSC Clock Mode Register SSC Receive Clock Mode Register SSC Receive Frame Mode Register SSC Transmit Clock Mode Register SSC Transmit Frame Mode Register SSC Receive Compare 0 Register SSC Receive Compare 1 Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.9 Synchronous Serial Controller (SSC) User Interface Table 32-5. Offset Register Mapping Register 0x0 Control Register 0x4 Clock Mode Register 0x8-0xC Reserved Name Access Reset SSC_CR Write-only - SSC_CMR Read/Write 0x0 - - - 0x10 Receive Clock Mode Register SSC_RCMR Read/Write 0x0 0x14 Receive Frame Mode Register SSC_RFMR Read/Write 0x0 0x18 Transmit Clock Mode Register SSC_TCMR Read/Write 0x0 0x1C Transmit Frame Mode Register SSC_TFMR Read/Write 0x0 0x20 Receive Holding Register SSC_RHR Read-only 0x0 0x24 Transmit Holding Register SSC_THR Write-only - - - - 0x28-0x2C Reserved 0x30 Receive Sync. Holding Register SSC_RSHR Read-only 0x0 0x34 Transmit Sync. Holding Register SSC_TSHR Read/Write 0x0 0x38 Receive Compare 0 Register SSC_RC0R Read/Write 0x0 0x3C Receive Compare 1 Register SSC_RC1R Read/Write 0x0 0x40 Status Register SSC_SR Read-only 0x000000CC 0x44 Interrupt Enable Register SSC_IER Write-only - 0x48 Interrupt Disable Register SSC_IDR Write-only - 0x4C Interrupt Mask Register SSC_IMR Read-only 0x0 - - - 0x50-0xE0 Reserved 0xE4 Write Protection Mode Register SSC_WPMR Read/Write 0x0 0xE8 Write Protection Status Register SSC_WPSR Read-only 0x0 Reserved - - - Reserved for PDC registers - - - 0xEC-0xFC 0x100-0x128 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 659 32.9.1 SSC Control Register Name: SSC_CR Address: 0x40004000 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 SWRST 14 - 13 - 12 - 11 - 10 - 9 TXDIS 8 TXEN 7 - 6 - 5 - 4 - 3 - 2 - 1 RXDIS 0 RXEN * RXEN: Receive Enable 0: No effect. 1: Enables Receive if RXDIS is not set. * RXDIS: Receive Disable 0: No effect. 1: Disables Receive. If a character is currently being received, disables at end of current character reception. * TXEN: Transmit Enable 0: No effect. 1: Enables Transmit if TXDIS is not set. * TXDIS: Transmit Disable 0: No effect. 1: Disables Transmit. If a character is currently being transmitted, disables at end of current character transmission. * SWRST: Software Reset 0: No effect. 1: Performs a software reset. Has priority on any other bit in SSC_CR. 660 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.9.2 SSC Clock Mode Register Name: SSC_CMR Address: 0x40004004 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 10 9 8 7 6 5 4 1 0 DIV 3 2 DIV This register can only be written if the WPEN bit is cleared in the SSC Write Protection Mode Register. * DIV: Clock Divider 0: The Clock Divider is not active. Any other value: The divided clock equals the peripheral clock divided by 2 times DIV. The maximum bit rate is fperipheral clock/2. The minimum bit rate is fperipheral clock/2 x 4095 = fperipheral clock/8190. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 661 32.9.3 SSC Receive Clock Mode Register Name: SSC_RCMR Address: 0x40004010 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 10 9 8 PERIOD 23 22 21 20 STTDLY 15 - 7 14 - 13 - 12 STOP 11 6 5 CKI 4 3 CKO CKG START 2 1 0 CKS This register can only be written if the WPEN bit is cleared in the SSC Write Protection Mode Register. * CKS: Receive Clock Selection Value Name Description 0 MCK Divided Clock 1 TK TK Clock signal 2 RK RK pin * CKO: Receive Clock Output Mode Selection Value Name Description 0 NONE None, RK pin is an input 1 CONTINUOUS Continuous Receive Clock, RK pin is an output 2 TRANSFER Receive Clock only during data transfers, RK pin is an output * CKI: Receive Clock Inversion 0: The data inputs (Data and Frame Sync signals) are sampled on Receive Clock falling edge. The Frame Sync signal output is shifted out on Receive Clock rising edge. 1: The data inputs (Data and Frame Sync signals) are sampled on Receive Clock rising edge. The Frame Sync signal output is shifted out on Receive Clock falling edge. CKI affects only the Receive Clock and not the output clock signal. 662 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * CKG: Receive Clock Gating Selection Value Name Description 0 CONTINUOUS None 1 EN_RF_LOW Receive Clock enabled only if RF Low 2 EN_RF_HIGH Receive Clock enabled only if RF High * START: Receive Start Selection Value Name Description 0 CONTINUOUS Continuous, as soon as the receiver is enabled, and immediately after the end of transfer of the previous data. 1 TRANSMIT Transmit start 2 RF_LOW Detection of a low level on RF signal 3 RF_HIGH Detection of a high level on RF signal 4 RF_FALLING Detection of a falling edge on RF signal 5 RF_RISING Detection of a rising edge on RF signal 6 RF_LEVEL Detection of any level change on RF signal 7 RF_EDGE Detection of any edge on RF signal 8 CMP_0 Compare 0 * STOP: Receive Stop Selection 0: After completion of a data transfer when starting with a Compare 0, the receiver stops the data transfer and waits for a new compare 0. 1: After starting a receive with a Compare 0, the receiver operates in a continuous mode until a Compare 1 is detected. * STTDLY: Receive Start Delay If STTDLY is not 0, a delay of STTDLY clock cycles is inserted between the start event and the actual start of reception. When the Receiver is programmed to start synchronously with the Transmitter, the delay is also applied. Note: It is very important that STTDLY be set carefully. If STTDLY must be set, it should be done in relation to TAG (Receive Sync Data) reception. * PERIOD: Receive Period Divider Selection This field selects the divider to apply to the selected Receive Clock in order to generate a new Frame Sync Signal. If 0, no PERIOD signal is generated. If not 0, a PERIOD signal is generated each 2 x (PERIOD + 1) Receive Clock. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 663 32.9.4 SSC Receive Frame Mode Register Name: SSC_RFMR Address: 0x40004014 Access: Read/Write 31 30 29 28 27 - 26 - 25 - 24 FSEDGE 21 FSOS 20 19 18 17 16 9 8 1 0 FSLEN_EXT 23 - 22 15 - 14 - 13 - 12 - 11 7 MSBF 6 - 5 LOOP 4 3 FSLEN 10 DATNB 2 DATLEN This register can only be written if the WPEN bit is cleared in the SSC Write Protection Mode Register. * DATLEN: Data Length 0: Forbidden value (1-bit data length not supported). Any other value: The bit stream contains DATLEN + 1 data bits. Moreover, it defines the transfer size performed by the PDC assigned to the Receiver. If DATLEN is lower or equal to 7, data transfers are in bytes. If DATLEN is between 8 and 15 (included), half-words are transferred, and for any other value, 32-bit words are transferred. * LOOP: Loop Mode 0: Normal operating mode. 1: RD is driven by TD, RF is driven by TF and TK drives RK. * MSBF: Most Significant Bit First 0: The lowest significant bit of the data register is sampled first in the bit stream. 1: The most significant bit of the data register is sampled first in the bit stream. * DATNB: Data Number per Frame This field defines the number of data words to be received after each transfer start, which is equal to (DATNB + 1). * FSLEN: Receive Frame Sync Length This field defines the number of bits sampled and stored in the Receive Sync Data Register. When this mode is selected by the START field in the Receive Clock Mode Register, it also determines the length of the sampled data to be compared to the Compare 0 or Compare 1 register. This field is used with FSLEN_EXT to determine the pulse length of the Receive Frame Sync signal. Pulse length is equal to FSLEN + (FSLEN_EXT x 16) + 1 Receive Clock periods. 664 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * FSOS: Receive Frame Sync Output Selection Value Name Description 0 NONE None, RF pin is an input 1 NEGATIVE Negative Pulse, RF pin is an output 2 POSITIVE Positive Pulse, RF pin is an output 3 LOW Driven Low during data transfer, RF pin is an output 4 HIGH Driven High during data transfer, RF pin is an output 5 TOGGLING Toggling at each start of data transfer, RF pin is an output * FSEDGE: Frame Sync Edge Detection Determines which edge on Frame Sync will generate the interrupt RXSYN in the SSC Status Register. Value Name Description 0 POSITIVE Positive Edge Detection 1 NEGATIVE Negative Edge Detection * FSLEN_EXT: FSLEN Field Extension Extends FSLEN field. For details, refer to FSLEN bit description on page 664. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 665 32.9.5 SSC Transmit Clock Mode Register Name: SSC_TCMR Address: 0x40004018 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 10 9 8 PERIOD 23 22 21 20 STTDLY 15 - 7 14 - 13 - 12 - 11 6 5 CKI 4 3 CKO CKG START 2 1 0 CKS This register can only be written if the WPEN bit is cleared in the SSC Write Protection Mode Register. * CKS: Transmit Clock Selection Value Name Description 0 MCK Divided Clock 1 RK RK Clock signal 2 TK TK pin * CKO: Transmit Clock Output Mode Selection Value Name Description 0 NONE None, TK pin is an input 1 CONTINUOUS Continuous Transmit Clock, TK pin is an output 2 TRANSFER Transmit Clock only during data transfers, TK pin is an output * CKI: Transmit Clock Inversion 0: The data outputs (Data and Frame Sync signals) are shifted out on Transmit Clock falling edge. The Frame sync signal input is sampled on Transmit clock rising edge. 1: The data outputs (Data and Frame Sync signals) are shifted out on Transmit Clock rising edge. The Frame sync signal input is sampled on Transmit clock falling edge. CKI affects only the Transmit Clock and not the output clock signal. * CKG: Transmit Clock Gating Selection Value 666 Name Description 0 CONTINUOUS None 1 EN_TF_LOW Transmit Clock enabled only if TF Low 2 EN_TF_HIGH Transmit Clock enabled only if TF High SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * START: Transmit Start Selection Value Name Description 0 CONTINUOUS Continuous, as soon as a word is written in the SSC_THR (if Transmit is enabled), and immediately after the end of transfer of the previous data 1 RECEIVE Receive start 2 TF_LOW Detection of a low level on TF signal 3 TF_HIGH Detection of a high level on TF signal 4 TF_FALLING Detection of a falling edge on TF signal 5 TF_RISING Detection of a rising edge on TF signal 6 TF_LEVEL Detection of any level change on TF signal 7 TF_EDGE Detection of any edge on TF signal * STTDLY: Transmit Start Delay If STTDLY is not 0, a delay of STTDLY clock cycles is inserted between the start event and the actual start of transmission of data. When the Transmitter is programmed to start synchronously with the Receiver, the delay is also applied. Note: Note: STTDLY must be set carefully. If STTDLY is too short in respect to TAG (Transmit Sync Data) emission, data is emitted instead of the end of TAG. * PERIOD: Transmit Period Divider Selection This field selects the divider to apply to the selected Transmit Clock to generate a new Frame Sync Signal. If 0, no period signal is generated. If not 0, a period signal is generated at each 2 x (PERIOD + 1) Transmit Clock. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 667 32.9.6 SSC Transmit Frame Mode Register Name: SSC_TFMR Address: 0x4000401C Access: Read/Write 31 30 29 28 27 - 26 - 25 - 24 FSEDGE 21 FSOS 20 19 18 17 16 9 8 1 0 FSLEN_EXT 23 FSDEN 22 15 - 14 - 13 - 12 - 11 7 MSBF 6 - 5 DATDEF 4 3 FSLEN 10 DATNB 2 DATLEN This register can only be written if the WPEN bit is cleared in the SSC Write Protection Mode Register. * DATLEN: Data Length 0: Forbidden value (1-bit data length not supported). Any other value: The bit stream contains DATLEN + 1 data bits. Moreover, it defines the transfer size performed by the PDC assigned to the Transmit. If DATLEN is lower or equal to 7, data transfers are bytes, if DATLEN is between 8 and 15 (included), half-words are transferred, and for any other value, 32-bit words are transferred. * DATDEF: Data Default Value This bit defines the level driven on the TD pin while out of transmission. Note that if the pin is defined as multi-drive by the PIO Controller, the pin is enabled only if the SCC TD output is 1. * MSBF: Most Significant Bit First 0: The lowest significant bit of the data register is shifted out first in the bit stream. 1: The most significant bit of the data register is shifted out first in the bit stream. * DATNB: Data Number per Frame This field defines the number of data words to be transferred after each transfer start, which is equal to (DATNB + 1). * FSLEN: Transmit Frame Sync Length This field defines the length of the Transmit Frame Sync signal and the number of bits shifted out from the Transmit Sync Data Register if FSDEN is 1. This field is used with FSLEN_EXT to determine the pulse length of the Transmit Frame Sync signal. Pulse length is equal to FSLEN + (FSLEN_EXT x 16) + 1 Transmit Clock period. 668 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * FSOS: Transmit Frame Sync Output Selection Value Name Description 0 NONE None, TF pin is an input 1 NEGATIVE Negative Pulse, TF pin is an output 2 POSITIVE Positive Pulse, TF pin is an output 3 LOW Driven Low during data transfer 4 HIGH Driven High during data transfer 5 TOGGLING Toggling at each start of data transfer * FSDEN: Frame Sync Data Enable 0: The TD line is driven with the default value during the Transmit Frame Sync signal. 1: SSC_TSHR value is shifted out during the transmission of the Transmit Frame Sync signal. * FSEDGE: Frame Sync Edge Detection Determines which edge on frame sync will generate the interrupt TXSYN (Status Register). Value Name Description 0 POSITIVE Positive Edge Detection 1 NEGATIVE Negative Edge Detection * FSLEN_EXT: FSLEN Field Extension Extends FSLEN field. For details, refer to FSLEN bit description on page 668. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 669 32.9.7 SSC Receive Holding Register Name: SSC_RHR Address: 0x40004020 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RDAT 23 22 21 20 RDAT 15 14 13 12 RDAT 7 6 5 4 RDAT * RDAT: Receive Data Right aligned regardless of the number of data bits defined by DATLEN in SSC_RFMR. 670 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.9.8 SSC Transmit Holding Register Name: SSC_THR Address: 0x40004024 Access: Write-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 TDAT 23 22 21 20 TDAT 15 14 13 12 TDAT 7 6 5 4 TDAT * TDAT: Transmit Data Right aligned regardless of the number of data bits defined by DATLEN in SSC_TFMR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 671 32.9.9 SSC Receive Synchronization Holding Register Name: SSC_RSHR Address: 0x40004030 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 RSDAT 7 6 5 4 RSDAT * RSDAT: Receive Synchronization Data 672 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.9.10 SSC Transmit Synchronization Holding Register Name: SSC_TSHR Address: 0x40004034 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 TSDAT 7 6 5 4 TSDAT * TSDAT: Transmit Synchronization Data SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 673 32.9.11 SSC Receive Compare 0 Register Name: SSC_RC0R Address: 0x40004038 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 CP0 7 6 5 4 CP0 This register can only be written if the WPEN bit is cleared in the SSC Write Protection Mode Register. * CP0: Receive Compare Data 0 674 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 32.9.12 SSC Receive Compare 1 Register Name: SSC_RC1R Address: 0x4000403C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 CP1 7 6 5 4 CP1 This register can only be written if the WPEN bit is cleared in the SSC Write Protection Mode Register. * CP1: Receive Compare Data 1 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 675 32.9.13 SSC Status Register Name: SSC_SR Address: 0x40004040 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 RXEN 16 TXEN 15 - 14 - 13 - 12 - 11 RXSYN 10 TXSYN 9 CP1 8 CP0 7 RXBUFF 6 ENDRX 5 OVRUN 4 RXRDY 3 TXBUFE 2 ENDTX 1 TXEMPTY 0 TXRDY * TXRDY: Transmit Ready 0: Data has been loaded in SSC_THR and is waiting to be loaded in the transmit shift register (TSR). 1: SSC_THR is empty. * TXEMPTY: Transmit Empty 0: Data remains in SSC_THR or is currently transmitted from TSR. 1: Last data written in SSC_THR has been loaded in TSR and last data loaded in TSR has been transmitted. * ENDTX: End of Transmission 0: The register SSC_TCR has not reached 0 since the last write in SSC_TCR or SSC_TNCR. 1: The register SSC_TCR has reached 0 since the last write in SSC_TCR or SSC_TNCR. * TXBUFE: Transmit Buffer Empty 0: SSC_TCR or SSC_TNCR have a value other than 0. 1: Both SSC_TCR and SSC_TNCR have a value of 0. * RXRDY: Receive Ready 0: SSC_RHR is empty. 1: Data has been received and loaded in SSC_RHR. * OVRUN: Receive Overrun 0: No data has been loaded in SSC_RHR while previous data has not been read since the last read of the Status Register. 1: Data has been loaded in SSC_RHR while previous data has not yet been read since the last read of the Status Register. * ENDRX: End of Reception 0: Data is written on the Receive Counter Register or Receive Next Counter Register. 1: End of PDC transfer when Receive Counter Register has arrived at zero. 676 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * RXBUFF: Receive Buffer Full 0: SSC_RCR or SSC_RNCR have a value other than 0. 1: Both SSC_RCR and SSC_RNCR have a value of 0. * CP0: Compare 0 0: A compare 0 has not occurred since the last read of the Status Register. 1: A compare 0 has occurred since the last read of the Status Register. * CP1: Compare 1 0: A compare 1 has not occurred since the last read of the Status Register. 1: A compare 1 has occurred since the last read of the Status Register. * TXSYN: Transmit Sync 0: A Tx Sync has not occurred since the last read of the Status Register. 1: A Tx Sync has occurred since the last read of the Status Register. * RXSYN: Receive Sync 0: An Rx Sync has not occurred since the last read of the Status Register. 1: An Rx Sync has occurred since the last read of the Status Register. * TXEN: Transmit Enable 0: Transmit is disabled. 1: Transmit is enabled. * RXEN: Receive Enable 0: Receive is disabled. 1: Receive is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 677 32.9.14 SSC Interrupt Enable Register Name: SSC_IER Address: 0x40004044 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 RXSYN 10 TXSYN 9 CP1 8 CP0 7 RXBUFF 6 ENDRX 5 OVRUN 4 RXRDY 3 TXBUFE 2 ENDTX 1 TXEMPTY 0 TXRDY * TXRDY: Transmit Ready Interrupt Enable 0: No effect. 1: Enables the Transmit Ready Interrupt. * TXEMPTY: Transmit Empty Interrupt Enable 0: No effect. 1: Enables the Transmit Empty Interrupt. * ENDTX: End of Transmission Interrupt Enable 0: No effect. 1: Enables the End of Transmission Interrupt. * TXBUFE: Transmit Buffer Empty Interrupt Enable 0: No effect. 1: Enables the Transmit Buffer Empty Interrupt * RXRDY: Receive Ready Interrupt Enable 0: No effect. 1: Enables the Receive Ready Interrupt. * OVRUN: Receive Overrun Interrupt Enable 0: No effect. 1: Enables the Receive Overrun Interrupt. * ENDRX: End of Reception Interrupt Enable 0: No effect. 1: Enables the End of Reception Interrupt. 678 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * RXBUFF: Receive Buffer Full Interrupt Enable 0: No effect. 1: Enables the Receive Buffer Full Interrupt. * CP0: Compare 0 Interrupt Enable 0: No effect. 1: Enables the Compare 0 Interrupt. * CP1: Compare 1 Interrupt Enable 0: No effect. 1: Enables the Compare 1 Interrupt. * TXSYN: Tx Sync Interrupt Enable 0: No effect. 1: Enables the Tx Sync Interrupt. * RXSYN: Rx Sync Interrupt Enable 0: No effect. 1: Enables the Rx Sync Interrupt. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 679 32.9.15 SSC Interrupt Disable Register Name: SSC_IDR Address: 0x40004048 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 RXSYN 10 TXSYN 9 CP1 8 CP0 7 RXBUFF 6 ENDRX 5 OVRUN 4 RXRDY 3 TXBUFE 2 ENDTX 1 TXEMPTY 0 TXRDY * TXRDY: Transmit Ready Interrupt Disable 0: No effect. 1: Disables the Transmit Ready Interrupt. * TXEMPTY: Transmit Empty Interrupt Disable 0: No effect. 1: Disables the Transmit Empty Interrupt. * ENDTX: End of Transmission Interrupt Disable 0: No effect. 1: Disables the End of Transmission Interrupt. * TXBUFE: Transmit Buffer Empty Interrupt Disable 0: No effect. 1: Disables the Transmit Buffer Empty Interrupt. * RXRDY: Receive Ready Interrupt Disable 0: No effect. 1: Disables the Receive Ready Interrupt. * OVRUN: Receive Overrun Interrupt Disable 0: No effect. 1: Disables the Receive Overrun Interrupt. * ENDRX: End of Reception Interrupt Disable 0: No effect. 1: Disables the End of Reception Interrupt. 680 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * RXBUFF: Receive Buffer Full Interrupt Disable 0: No effect. 1: Disables the Receive Buffer Full Interrupt. * CP0: Compare 0 Interrupt Disable 0: No effect. 1: Disables the Compare 0 Interrupt. * CP1: Compare 1 Interrupt Disable 0: No effect. 1: Disables the Compare 1 Interrupt. * TXSYN: Tx Sync Interrupt Enable 0: No effect. 1: Disables the Tx Sync Interrupt. * RXSYN: Rx Sync Interrupt Enable 0: No effect. 1: Disables the Rx Sync Interrupt. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 681 32.9.16 SSC Interrupt Mask Register Name: SSC_IMR Address: 0x4000404C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 RXSYN 10 TXSYN 9 CP1 8 CP0 7 RXBUFF 6 ENDRX 5 OVRUN 4 RXRDY 3 TXBUFE 2 ENDTX 1 TXEMPTY 0 TXRDY * TXRDY: Transmit Ready Interrupt Mask 0: The Transmit Ready Interrupt is disabled. 1: The Transmit Ready Interrupt is enabled. * TXEMPTY: Transmit Empty Interrupt Mask 0: The Transmit Empty Interrupt is disabled. 1: The Transmit Empty Interrupt is enabled. * ENDTX: End of Transmission Interrupt Mask 0: The End of Transmission Interrupt is disabled. 1: The End of Transmission Interrupt is enabled. * TXBUFE: Transmit Buffer Empty Interrupt Mask 0: The Transmit Buffer Empty Interrupt is disabled. 1: The Transmit Buffer Empty Interrupt is enabled. * RXRDY: Receive Ready Interrupt Mask 0: The Receive Ready Interrupt is disabled. 1: The Receive Ready Interrupt is enabled. * OVRUN: Receive Overrun Interrupt Mask 0: The Receive Overrun Interrupt is disabled. 1: The Receive Overrun Interrupt is enabled. * ENDRX: End of Reception Interrupt Mask 0: The End of Reception Interrupt is disabled. 1: The End of Reception Interrupt is enabled. 682 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * RXBUFF: Receive Buffer Full Interrupt Mask 0: The Receive Buffer Full Interrupt is disabled. 1: The Receive Buffer Full Interrupt is enabled. * CP0: Compare 0 Interrupt Mask 0: The Compare 0 Interrupt is disabled. 1: The Compare 0 Interrupt is enabled. * CP1: Compare 1 Interrupt Mask 0: The Compare 1 Interrupt is disabled. 1: The Compare 1 Interrupt is enabled. * TXSYN: Tx Sync Interrupt Mask 0: The Tx Sync Interrupt is disabled. 1: The Tx Sync Interrupt is enabled. * RXSYN: Rx Sync Interrupt Mask 0: The Rx Sync Interrupt is disabled. 1: The Rx Sync Interrupt is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 683 32.9.17 SSC Write Protection Mode Register Name: SSC_WPMR Address: 0x400040E4 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x535343 ("SSC" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x535343 ("SSC" in ASCII). See Section 32.8.10 "Register Write Protection" for the list of registers that can be protected. * WPKEY: Write Protection Key Value 0x535343 684 Name PASSWD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. 32.9.18 SSC Write Protection Status Register Name: SSC_WPSR Address: 0x400040E8 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPVS WPVSRC 15 14 13 12 WPVSRC 7 - 6 - 5 - 4 - * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the SSC_WPSR. 1: A write protection violation has occurred since the last read of the SSC_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protect Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 685 33. Serial Peripheral Interface (SPI) 33.1 Description The Serial Peripheral Interface (SPI) circuit is a synchronous serial data link that provides communication with external devices in Master or Slave mode. It also enables communication between processors if an external processor is connected to the system. The Serial Peripheral Interface is essentially a Shift register that serially transmits data bits to other SPIs. During a data transfer, one SPI system acts as the "master"' which controls the data flow, while the other devices act as "slaves'' which have data shifted into and out by the master. Different CPUs can take turn being masters (multiple master protocol, contrary to single master protocol where one CPU is always the master while all of the others are always slaves). One master can simultaneously shift data into multiple slaves. However, only one slave can drive its output to write data back to the master at any given time. A slave device is selected when the master asserts its NSS signal. If multiple slave devices exist, the master generates a separate slave select signal for each slave (NPCS). The SPI system consists of two data lines and two control lines: 686 Master Out Slave In (MOSI)--This data line supplies the output data from the master shifted into the input(s) of the slave(s). Master In Slave Out (MISO)--This data line supplies the output data from a slave to the input of the master. There may be no more than one slave transmitting data during any particular transfer. Serial Clock (SPCK)--This control line is driven by the master and regulates the flow of the data bits. The master can transmit data at a variety of baud rates; there is one SPCK pulse for each bit that is transmitted. Slave Select (NSS)--This control line allows slaves to be turned on and off by hardware. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.2 Embedded Characteristics Master or Slave Serial Peripheral Bus Interface 8-bit to 16-bit programmable data length per chip select Programmable phase and polarity per chip select Programmable transfer delay between consecutive transfers and delay before SPI clock per chip select Programmable delay between chip selects Selectable mode fault detection Master Mode can drive SPCK up to Peripheral Clock Master Mode Bit Rate can be Independent of the Processor/Peripheral Clock Slave mode operates on SPCK, asynchronously with core and bus clock Four chip selects with external decoder support allow communication with up to 15 peripherals Communication with Serial External Devices Supported Serial memories, such as DataFlash and 3-wire EEPROMs Serial peripherals, such as ADCs, DACs, LCD controllers, CAN controllers and sensors External coprocessors Connection to PDC Channel Capabilities, Optimizing Data Transfers One channel for the receiver One channel for the transmitter Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 687 33.3 Block Diagram Figure 33-1. Block Diagram AHB Matrix PDC Peripheral bridge Trigger events Bus clock PMC 33.4 Peripheral clock SPI Application Block Diagram Figure 33-2. Application Block Diagram: Single Master/Multiple Slave Implementation SPI Master SPCK SPCK MISO MISO MOSI MOSI NPCS0 NSS Slave 0 SPCK NPCS1 NPCS2 NPCS3 NC MISO Slave 1 MOSI NSS SPCK MISO Slave 2 MOSI NSS 688 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.5 Signal Description Table 33-1. Signal Description Type 33.6 Pin Name Pin Description Master Slave MISO Master In Slave Out Input Output MOSI Master Out Slave In Output Input SPCK Serial Clock Output Input NPCS1-NPCS3 Peripheral Chip Selects Output Unused NPCS0/NSS Peripheral Chip Select/Slave Select Output Input Product Dependencies 33.6.1 I/O Lines The pins used for interfacing the compliant external devices can be multiplexed with PIO lines. The programmer must first program the PIO controllers to assign the SPI pins to their peripheral functions. Table 33-2. I/O Lines Instance Signal I/O Line Peripheral SPI MISO PA12 A SPI MOSI PA13 A SPI NPCS0 PA11 A SPI NPCS1 PA9 B SPI NPCS1 PA31 A SPI NPCS1 PB14 A SPI NPCS1 PC4 B SPI NPCS2 PA10 B SPI NPCS2 PA30 B SPI NPCS2 PB2 B SPI NPCS3 PA3 B SPI NPCS3 PA5 B SPI NPCS3 PA22 B SPI SPCK PA14 A 33.6.2 Power Management The SPI can be clocked through the Power Management Controller (PMC), thus the programmer must first configure the PMC to enable the SPI clock. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 689 33.6.3 Interrupt The SPI interface has an interrupt line connected to the interrupt controller. Handling the SPI interrupt requires programming the interrupt controller before configuring the SPI. Table 33-3. Peripheral IDs Instance ID SPI 21 33.6.4 Peripheral DMA Controller (PDC) The SPI interface can be used in conjunction with the PDC in order to reduce processor overhead. For a full description of the PDC, refer to the corresponding section in the full datasheet. 690 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.7 Functional Description 33.7.1 Modes of Operation The SPI operates in Master mode or in Slave mode. The SPI operates in Master mode by writing a 1 to the MSTR bit in the SPI Mode Register (SPI_MR): Pins NPCS0 to NPCS3 are all configured as outputs The SPCK pin is driven The MISO line is wired on the receiver input The MOSI line is driven as an output by the transmitter. The SPI operates in Slave mode if the MSTR bit in the SPI_MR is written to 0: The MISO line is driven by the transmitter output The MOSI line is wired on the receiver input The SPCK pin is driven by the transmitter to synchronize the receiver. The NPCS0 pin becomes an input, and is used as a slave select signal (NSS) NPCS1 to NPCS3 are not driven and can be used for other purposes. The data transfers are identically programmable for both modes of operations. The baud rate generator is activated only in Master mode. 33.7.2 Data Transfer Four combinations of polarity and phase are available for data transfers. The clock polarity is programmed with the CPOL bit in the SPI Chip Select register (SPI_CSR). The clock phase is programmed with the NCPHA bit. These two parameters determine the edges of the clock signal on which data is driven and sampled. Each of the two parameters has two possible states, resulting in four possible combinations that are incompatible with one another. Consequently, a master/slave pair must use the same parameter pair values to communicate. If multiple slaves are connected and require different configurations, the master must reconfigure itself each time it needs to communicate with a different slave. Table 33-4 shows the four modes and corresponding parameter settings. Table 33-4. SPI Bus Protocol Mode SPI Mode CPOL NCPHA Shift SPCK Edge Capture SPCK Edge SPCK Inactive Level 0 0 1 Falling Rising Low 1 0 0 Rising Falling Low 2 1 1 Rising Falling High 3 1 0 Falling Rising High Figure 33-3 and Figure 33-4 show examples of data transfers. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 691 Figure 33-3. SPI Transfer Format (NCPHA = 1, 8 bits per transfer) 1 SPCK cycle (for reference) 2 3 4 6 5 7 8 SPCK (CPOL = 0) SPCK (CPOL = 1) MOSI (from master) MSB MISO (from slave) MSB 6 5 4 3 2 1 LSB 6 5 4 3 2 1 LSB * NSS (to slave) * Not defined. Figure 33-4. SPI Transfer Format (NCPHA = 0, 8 bits per transfer) 1 SPCK cycle (for reference) 2 3 4 5 8 7 6 SPCK (CPOL = 0) SPCK (CPOL = 1) MOSI (from master) MISO (from slave) * MSB 6 5 4 3 2 1 MSB 6 5 4 3 2 1 NSS (to slave) * Not defined. 692 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 LSB LSB 33.7.3 Master Mode Operations When configured in Master mode, the SPI operates on the clock generated by the internal programmable baud rate generator. It fully controls the data transfers to and from the slave(s) connected to the SPI bus. The SPI drives the chip select line to the slave and the serial clock signal (SPCK). The SPI features two holding registers, the Transmit Data Register (SPI_TDR) and the Receive Data Register (SPI_RDR), and a single shift register. The holding registers maintain the data flow at a constant rate. After enabling the SPI, a data transfer starts when the processor writes to the SPI_TDR. The written data is immediately transferred in the Shift register and the transfer on the SPI bus starts. While the data in the Shift register is shifted on the MOSI line, the MISO line is sampled and shifted in the Shift register. Data cannot be loaded in the SPI_RDR without transmitting data. If there is no data to transmit, dummy data can be used (SPI_TDR filled with ones). When the SPI_MR.WDRBT bit is set, new data cannot be transmitted if the SPI_RDR has not been read. If Receiving mode is not required, for example when communicating with a slave receiver only (such as an LCD), the receive status flags in the SPI Status register (SPI_SR) can be discarded. Before writing the SPI_TDR, the PCS field in the SPI_MR must be set in order to select a slave. If new data is written in the SPI_TDR during the transfer, it is kept in the SPI_TDR until the current transfer is completed. Then, the received data is transferred from the Shift register to the SPI_RDR, the data in the SPI_TDR is loaded in the Shift register and a new transfer starts. As soon as the SPI_TDR is written, the Transmit Data Register Empty (TDRE) flag in the SPI_SR is cleared. When the data written in the SPI_TDR is loaded into the Shift register, the TDRE flag in the SPI_SR is set. The TDRE bit is used to trigger the Transmit PDC channel. See Figure 33-5. The end of transfer is indicated by the TXEMPTY flag in the SPI_SR. If a transfer delay (DLYBCT) is greater than 0 for the last transfer, TXEMPTY is set after the completion of this delay. The peripheral clock can be switched off at this time. Note: Figure 33-5. When the SPI is enabled, the TDRE and TXEMPTY flags are set. TDRE and TXEMPTY flag behavior Write SPI_CR.SPIEN =1 TDRE Write SPI_TDR Write SPI_TDR automatic set TDR loaded in shifter Write SPI_TDR automatic set TDR loaded in shifter automatic set TDR loaded in shifter TXEMPTY Transfer Transfer DLYBCT Transfer DLYBCT DLYBCT The transfer of received data from the Shift register to the SPI_RDR is indicated by the Receive Data Register Full (RDRF) bit in the SPI_SR. When the received data is read, the RDRF bit is cleared. If the SPI_RDR has not been read before new data is received, the Overrun Error (OVRES) bit in the SPI_SR is set. As long as this flag is set, data is loaded in the SPI_RDR. The user has to read the SPI_SR to clear the OVRES bit. Figure 33-6, shows a block diagram of the SPI when operating in Master mode. Figure 33-7 on page 695 shows a flow chart describing how transfers are handled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 693 33.7.3.1 Master Mode Block Diagram Figure 33-6. Master Mode Block Diagram SPI_CSRx SCBR Baud Rate Generator Peripheral clock SPCK SPI Clock SPI_CSRx BITS NCPHA CPOL LSB MISO SPI_RDR RDRF OVRES RD MSB Shift Register MOSI SPI_TDR TDRE TD SPI_CSRx SPI_RDR CSAAT PCS PS NPCSx PCSDEC SPI_MR PCS 0 Current Peripheral SPI_TDR NPCS0 PCS 1 MSTR MODF NPCS0 MODFDIS 694 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.7.3.2 Master Mode Flow Diagram Figure 33-7. Master Mode Flow Diagram SPI Enable TDRE/TXEMPTY are set TDRE ? (SW check) 0 1 Write SPI_TDR ? - NPCS defines the current Chip Select - CSAAT, DLYBS, DLYBCT refer to the fields of the Chip Select Register corresponding to the Current Chip Select - `x <= y' must be interpreted as `x is loaded with y' where x,y represent either register fields or SPI pins - HW = hardware, SW = software no yes TDRE/TXEMPTY are cleared CSAAT ? (HW check) 1 PS ? (HW check) 0 1 PS ? (HW check) 1 0 Fixed peripheral Variable peripheral NPCS <= SPI_TDR(PCS) Fixed peripheral 0 Variable peripheral SPI_TDR(PCS) = NPCS ? (HW check) yes SPI_MR(PCS) = NPCS ? (HW check) no NPCS <= SPI_MR(PCS) no NPCS deasserted NPCS deasserted Delay DLYBCS Delay DLYBCS NPCS <= SPI_TDR(PCS) NPCS <= SPI_MR(PCS), SPI_TDR(PCS) Delay DLYBS Shifter <= SPI_TDR(TD) TDRE is set Data Transfer (SPI bus driven) From this step, SPI_TDR can be rewritten for the next transfer SPI_RDR(RD) <= Shifter RDRF is set if read is required Read SPI_RDR(RD) Delay DLYBCT TDRE ? (HW check) 0 (i.e. a new write to SPI_TDR occured while data transfer or delay DLYBCT) 1 TXEMPTY is set 1 CSAAT ? (HW check) 0 NPCS deasserted Delay DLYBCS SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 695 Figure 33-8 shows the behavior of Transmit Data Register Empty (TDRE), Receive Data Register (RDRF) and Transmission Register Empty (TXEMPTY) status flags within the SPI_SR during an 8-bit data transfer in Fixed mode without the PDC involved. Figure 33-8. Status Register Flags Behavior 1 2 3 4 6 5 7 8 SPCK NPCS0 MOSI (from master) MSB 6 5 4 3 2 1 LSB TDRE RDR read Write in SPI_TDR RDRF MISO (from slave) MSB 6 5 4 3 2 1 LSB TXEMPTY shift register empty 696 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 33-9 shows the behavior of Transmission Register Empty (TXEMPTY), End of RX buffer (ENDRX), End of TX buffer (ENDTX), RX Buffer Full (RXBUFF) and TX Buffer Empty (TXBUFE) status flags within the SPI_SR during an 8-bit data transfer in Fixed mode with the PDC involved. The PDC is programmed to transfer and receive three units of data. The next pointer and counter are not used. The RDRF and TDRE are not shown because these flags are managed by the PDC when using the PDC. Figure 33-9. PDC Status Register Flags Behavior 1 3 2 SPCK NPCS0 MOSI MSB (from master) MISO MSB (from slave) 6 5 4 3 2 1 LSB MSB 6 5 4 3 2 1 LSB MSB 6 5 4 3 2 1 LSB 6 5 4 3 2 1 LSB MSB 6 5 4 3 2 1 LSB MSB 6 5 4 3 2 1 LSB TDRE (not required if PDC is used) PDC loads first byte PDC loads 2nd byte (double buffer effect) PDC loads last byte ENDTX ENDRX TXBUFE RXBUFF TXEMPTY 33.7.3.3 Clock Generation The SPI Baud rate clock is generated by dividing the peripheral clock by a value between 1 and 255. If the SCBR field in the SPI_CSR is programmed to 1, the operating baud rate is peripheral clock (see the electrical characteristics section for the SPCK maximum frequency). Triggering a transfer while SCBR is at 0 can lead to unpredictable results. At reset, SCBR is 0 and the user has to program it to a valid value before performing the first transfer. The divisor can be defined independently for each chip select, as it has to be programmed in the SCBR field. This allows the SPI to automatically adapt the baud rate for each interfaced peripheral without reprogramming. 33.7.3.4 Transfer Delays Figure 33-10 shows a chip select transfer change and consecutive transfers on the same chip select. Three delays can be programmed to modify the transfer waveforms: Delay between the chip selects--programmable only once for all chip selects by writing the DLYBCS field in the SPI_MR. The SPI slave device deactivation delay is managed through DLYBCS. If there is only one SPI slave device connected to the master, the DLYBCS field does not need to be configured. If several slave devices are connected to a master, DLYBCS must be configured depending on the highest deactivation delay. Refer to the SPI slave device electrical characteristics. Delay before SPCK--independently programmable for each chip select by writing the DLYBS field. The SPI slave device activation delay is managed through DLYBS. Refer to the SPI slave device electrical characteristics to define DLYBS. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 697 Delay between consecutive transfers--independently programmable for each chip select by writing the DLYBCT field. The time required by the SPI slave device to process received data is managed through DLYBCT. This time depends on the SPI slave system activity. These delays allow the SPI to be adapted to the interfaced peripherals and their speed and bus release time. Figure 33-10. Programmable Delays Chip Select 1 Chip Select 2 SPCK DLYBCS 33.7.3.5 DLYBS DLYBCT DLYBCT Peripheral Selection The serial peripherals are selected through the assertion of the NPCS0 to NPCS3 signals. By default, all NPCS signals are high before and after each transfer. Fixed Peripheral Select Mode: SPI exchanges data with only one peripheral. Fixed peripheral select mode is enabled by writing the PS bit to zero in the SPI_MR. In this case, the current peripheral is defined by the PCS field in the SPI_MR and the PCS field in the SPI_TDR has no effect. Variable Peripheral Select Mode: Data can be exchanged with more than one peripheral without having to reprogram the NPCS field in the SPI_MR. Variable peripheral select mode is enabled by setting the PS bit to 1 in the SPI_MR. The PCS field in the SPI_TDR is used to select the current peripheral. This means that the peripheral selection can be defined for each new data. The value to write in the SPI_TDR has the following format: [xxxxxxx(7-bit) + LASTXFER(1-bit)(1)+ xxxx(4-bit) + PCS (4-bit) + DATA (8 to 16-bit)] with PCS equals the chip select to assert, as defined in Section 33.8.4 "SPI Transmit Data Register" and LASTXFER bit at 0 or 1 depending on the CSAAT bit. Note: 1. Optional CSAAT, LASTXFER and CSNAAT bits are discussed in Section 33.7.3.9 "Peripheral Deselection with PDC". If LASTXFER is used, the command must be issued after writing the last character. Instead of LASTXFER, the user can use the SPIDIS command. After the end of the PDC transfer, it is necessary to wait for the TXEMPTY flag and then write SPIDIS into the SPI Control Register (SPI_CR). This does not change the configuration register values). The NPCS is disabled after the last character transfer. Then, another PDC transfer can be started if the SPIEN has previously been written in the SPI_CR. 33.7.3.6 SPI Peripheral DMA Controller (PDC) In both Fixed and Variable peripheral select modes, the Peripheral DMA Controller (PDC) can be used to reduce processor overhead. The fixed peripheral selection allows buffer transfers with a single peripheral. Using the PDC is an optimal means, as the size of the data transfer between the memory and the SPI is either 8 bits or 16 bits. However, if the peripheral selection is modified, the SPI_MR must be reprogrammed. 698 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The variable peripheral selection allows buffer transfers with multiple peripherals without reprogramming the SPI_MR. Data written in the SPI_TDR is 32 bits wide and defines the real data to be transmitted and the destination peripheral. Using the PDC in this mode requires 32-bit wide buffers, with the data in the LSBs and the PCS and LASTXFER fields in the MSBs. However, the SPI still controls the number of bits (8 to16) to be transferred through MISO and MOSI lines with the chip select configuration registers (SPI_CSRx). This is not the optimal means in terms of memory size for the buffers, but it provides a very effective means to exchange data with several peripherals without any intervention of the processor. Transfer Size Depending on the data size to transmit, from 8 to 16 bits, the PDC manages automatically the type of pointer size it has to point to. The PDC performs the following transfer, depending on the mode and number of bits per data. 33.7.3.7 Fixed mode: 8-bit data: 1-Byte transfer, PDC pointer address = address + 1 byte, PDC counter = counter - 1 9-bit to 16-bit data: 2-Byte transfer. n-bit data transfer with don't care data (MSB) filled with 0's, PDC pointer address = address + 2 bytes, PDC counter = counter - 1 Variable mode: In Variable mode, PDC pointer address = address +4 bytes and PDC counter = counter - 1 for 8 to 16bit transfer size. When using the PDC, the TDRE and RDRF flags are handled by the PDC. The user's application does not have to check these bits. Only End of RX Buffer (ENDRX), End of TX Buffer (ENDTX), Buffer Full (RXBUFF), TX Buffer Empty (TXBUFE) are significant. For further details about the Peripheral DMA Controller and user interface, refer to the PDC section of the product datasheet. Peripheral Chip Select Decoding The user can program the SPI to operate with up to 15 slave peripherals by decoding the four chip select lines, NPCS0 to NPCS3 with an external decoder/demultiplexer (refer to Figure 33-11). This can be enabled by writing a 1 to the PCSDEC bit in the SPI_MR. When operating without decoding, the SPI makes sure that in any case only one chip select line is activated, i.e., one NPCS line driven low at a time. If two bits are defined low in a PCS field, only the lowest numbered chip select is driven low. When operating with decoding, the SPI directly outputs the value defined by the PCS field on the NPCS lines of either SPI_MR or SPI_TDR (depending on PS). As the SPI sets a default value of 0xF on the chip select lines (i.e., all chip select lines at 1) when not processing any transfer, only 15 peripherals can be decoded. The SPI has four Chip Select registers. As a result, when external decoding is activated, each NPCS chip select defines the characteristics of up to four peripherals. As an example, SPI_CRS0 defines the characteristics of the externally decoded peripherals 0 to 3, corresponding to the PCS values 0x0 to 0x3. Consequently, the user has to make sure to connect compatible peripherals on the decoded chip select lines 0 to 3, 4 to 7, 8 to 11 and 12 to 14. Figure 33-11 shows this type of implementation. If the CSAAT bit is used, with or without the PDC, the Mode Fault detection for NPCS0 line must be disabled. This is not required for all other chip select lines since mode fault detection is only on NPCS0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 699 Figure 33-11. Chip Select Decoding Application Block Diagram: Single Master/Multiple Slave Implementation SPCK MISO MOSI SPCK MISO MOSI SPCK MISO MOSI SPCK MISO MOSI Slave 0 Slave 1 Slave 14 NSS NSS SPI Master NSS NPCS0 NPCS1 NPCS2 NPCS3 Decoded chip select lines External 1-of-n Decoder/Demultiplexer 33.7.3.8 Peripheral Deselection without PDC During a transfer of more than one unit of data on a Chip Select without the PDC, the SPI_TDR is loaded by the processor, the TDRE flag rises as soon as the content of the SPI_TDR is transferred into the internal Shift register. When this flag is detected high, the SPI_TDR can be reloaded. If this reload by the processor occurs before the end of the current transfer and if the next transfer is performed on the same chip select as the current transfer, the Chip Select is not de-asserted between the two transfers. But depending on the application software handling the SPI status register flags (by interrupt or polling method) or servicing other interrupts or other tasks, the processor may not reload the SPI_TDR in time to keep the chip select active (low). A null DLYBCT value (delay between consecutive transfers) in the SPI_CSR, gives even less time for the processor to reload the SPI_TDR. With some SPI slave peripherals, if the chip select line must remain active (low) during a full set of transfers, communication errors can occur. To facilitate interfacing with such devices, the Chip Select registers [CSR0...CSR3] can be programmed with the Chip Select Active After Transfer (CSAAT) bit to 1. This allows the chip select lines to remain in their current state (low = active) until a transfer to another chip select is required. Even if the SPI_TDR is not reloaded, the chip select remains active. To de-assert the chip select line at the end of the transfer, the Last Transfer (LASTXFER) bit in SPI_CR must be set after writing the last data to transmit into SPI_TDR. 33.7.3.9 Peripheral Deselection with PDC PDC provides faster reloads of the SPI_TDR compared to software. However, depending on the system activity, it is not guaranteed that the SPI_TDR is written with the next data before the end of the current transfer. Consequently, data can be lost by the de-assertion of the NPCS line for SPI slave peripherals requiring the chip select line to remain active between two transfers. The only way to guarantee a safe transfer in this case is the use of the CSAAT and LASTXFER bits. When the CSAAT bit is configured to 0, the NPCS does not rise in all cases between two transfers on the same peripheral. During a transfer on a Chip Select, the TDRE flag rises as soon as the content of the SPI_TDR is transferred into the internal shift register. When this flag is detected, the SPI_TDR can be reloaded. If this reload occurs before the end of the current transfer and if the next transfer is performed on the same chip select as the current transfer, the Chip Select is not de-asserted between the two transfers. This can lead to difficulties to interface with some serial peripherals requiring the chip select to be de-asserted after each transfer. To facilitate 700 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 interfacing with such devices, the SPI_CSR can be programmed with the Chip Select Not Active After Transfer (CSNAAT) bit to 1. This allows the chip select lines to be de-asserted systematically during a time "DLYBCS" (the value of the CSNAAT bit is processed only if the CSAAT bit is configured to 0 for the same chip select). Figure 33-12 shows different peripheral deselection cases and the effect of the CSAAT and CSNAAT bits. Figure 33-12. Peripheral Deselection CSAAT = 0 and CSNAAT = 0 TDRE NPCS[0..n] CSAAT = 1 and CSNAAT= 0 / 1 DLYBCT DLYBCT A A A A DLYBCS A DLYBCS PCS = A PCS = A Write SPI_TDR TDRE NPCS[0..n] DLYBCT DLYBCT A A A A DLYBCS A DLYBCS PCS=A PCS = A Write SPI_TDR TDRE NPCS[0..n] DLYBCT DLYBCT A B A B DLYBCS DLYBCS PCS = B PCS = B Write SPI_TDR CSAAT = 0 and CSNAAT = 0 CSAAT = 0 and CSNAAT = 1 DLYBCT DLYBCT TDRE NPCS[0..n] A A A A DLYBCS PCS = A PCS = A Write SPI_TDR 33.7.3.10 Mode Fault Detection The SPI has the capability to operate in multi-master environment. Consequently, the NPCS0/NSS line must be monitored. If one of the masters on the SPI bus is currently transmitting, the NPCS0/NSS line is low and the SPI must not transmit any data. A mode fault is detected when the SPI is programmed in Master mode and a low level SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 701 is driven by an external master on the NPCS0/NSS signal. In multi-master environment, NPCS0, MOSI, MISO and SPCK pins must be configured in open drain (through the PIO controller). When a mode fault is detected, the SPI_SR.MODF bit is set until SPI_SR is read and the SPI is automatically disabled until it is re-enabled by writing a 1 to the SPI_CR.SPIEN bit. By default, the mode fault detection is enabled. The user can disable it by setting the SPI_MR.MODFDIS bit. 33.7.4 SPI Slave Mode When operating in Slave mode, the SPI processes data bits on the clock provided on the SPI clock pin (SPCK). The SPI waits until NSS goes active before receiving the serial clock from an external master. When NSS falls, the clock is validated and the data is loaded in the SPI_RDR depending on the BITS field configured in the SPI_CSR0. These bits are processed following a phase and a polarity defined respectively by the NCPHA and CPOL bits in the SPI_CSR0. Note that BITS, CPOL and NCPHA of the other Chip Select registers have no effect when the SPI is programmed in Slave mode. The bits are shifted out on the MISO line and sampled on the MOSI line. Note: For more information on the BITS field, see also the note below the SPI_CSRx register bitmap (Section 33.8.9 "SPI Chip Select Register"). When all bits are processed, the received data is transferred in the SPI_RDR and the RDRF bit rises. If the SPI_RDR has not been read before new data is received, the Overrun Error Status (OVRES) bit in the SPI_SR is set. As long as this flag is set, data is loaded in the SPI_RDR. The user must read SPI_SR to clear the OVRES bit. When a transfer starts, the data shifted out is the data present in the Shift register. If no data has been written in the SPI_TDR, the last data received is transferred. If no data has been received since the last reset, all bits are transmitted low, as the Shift register resets to 0. When a first data is written in the SPI_TDR, it is transferred immediately in the Shift register and the TDRE flag rises. If new data is written, it remains in the SPI_TDR until a transfer occurs, i.e., NSS falls and there is a valid clock on the SPCK pin. When the transfer occurs, the last data written in the SPI_TDR is transferred in the Shift register and the TDRE flag rises. This enables frequent updates of critical variables with single transfers. Then, new data is loaded in the Shift register from the SPI_TDR. If no character is ready to be transmitted, i.e., no character has been written in the SPI_TDR since the last load from the SPI_TDR to the Shift register, the SPI_TDR is retransmitted. In this case the Underrun Error Status Flag (UNDES) is set in the SPI_SR. Figure 33-13 shows a block diagram of the SPI when operating in Slave mode. Figure 33-13. Slave Mode Functional Block Diagram SPCK NSS SPI Clock SPIEN SPIENS SPIDIS SPI_CSR0 BITS NCPHA CPOL MOSI LSB SPI_RDR RDRF OVRES RD MSB Shift Register MISO SPI_TDR TD 702 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 TDRE 33.7.5 Register Write Protection To prevent any single software error from corrupting SPI behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the SPI Write Protection Mode Register (SPI_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the SPI Write Protection Status Register (SPI_WPSR) is set and the WPVSRC field indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading SPI_WPSR. The following registers can be write-protected: SPI Mode Register SPI Chip Select Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 703 33.8 Serial Peripheral Interface (SPI) User Interface Table 33-5. Register Mapping Offset Register Name Access Reset 0x00 Control Register SPI_CR Write-only - 0x04 Mode Register SPI_MR Read/Write 0x0 0x08 Receive Data Register SPI_RDR Read-only 0x0 0x0C Transmit Data Register SPI_TDR Write-only - 0x10 Status Register SPI_SR Read-only 0x000000F0 0x14 Interrupt Enable Register SPI_IER Write-only - 0x18 Interrupt Disable Register SPI_IDR Write-only - 0x1C Interrupt Mask Register SPI_IMR Read-only 0x0 Reserved - - - 0x30 Chip Select Register 0 SPI_CSR0 Read/Write 0x0 0x34 Chip Select Register 1 SPI_CSR1 Read/Write 0x0 0x38 Chip Select Register 2 SPI_CSR2 Read/Write 0x0 0x3C Chip Select Register 3 SPI_CSR3 Read/Write 0x0 Reserved - - - 0xE4 Write Protection Mode Register SPI_WPMR Read/Write 0x0 0xE8 Write Protection Status Register SPI_WPSR Read-only 0x0 0xEC-0xF8 Reserved - - - 0xFC Reserved - - - Reserved for PDC Registers - - - 0x20-0x2C 0x40-0xE0 0x100-0x124 704 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.8.1 SPI Control Register Name: SPI_CR Address: 0x40008000 Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - LASTXFER 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 SWRST - - - - - SPIDIS SPIEN * SPIEN: SPI Enable 0: No effect. 1: Enables the SPI to transfer and receive data. * SPIDIS: SPI Disable 0: No effect. 1: Disables the SPI. All pins are set in Input mode after completion of the transmission in progress, if any. If a transfer is in progress when SPIDIS is set, the SPI completes the transmission of the shifter register and does not start any new transfer, even if the SPI_THR is loaded. Note: If both SPIEN and SPIDIS are equal to one when the SPI_CR is written, the SPI is disabled. * SWRST: SPI Software Reset 0: No effect. 1: Reset the SPI. A software-triggered hardware reset of the SPI interface is performed. The SPI is in Slave mode after software reset. PDC channels are not affected by software reset. * LASTXFER: Last Transfer 0: No effect. 1: The current NPCS is de-asserted after the character written in TD has been transferred. When SPI_CSRx.CSAAT is set, the communication with the current serial peripheral can be closed by raising the corresponding NPCS line as soon as TD transfer is completed. Refer to Section 33.7.3.5 "Peripheral Selection" for more details. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 705 33.8.2 SPI Mode Register Name: SPI_MR Address: 0x40008004 Access: Read/Write 31 30 29 28 27 26 19 18 25 24 17 16 DLYBCS 23 22 21 20 - - - - 15 14 13 12 11 10 9 8 - - - - - - - - PCS 7 6 5 4 3 2 1 0 LLB - WDRBT MODFDIS - PCSDEC PS MSTR This register can only be written if the WPEN bit is cleared in the SPI Write Protection Mode Register. * MSTR: Master/Slave Mode 0: SPI is in Slave mode 1: SPI is in Master mode * PS: Peripheral Select 0: Fixed Peripheral Select 1: Variable Peripheral Select * PCSDEC: Chip Select Decode 0: The chip selects are directly connected to a peripheral device. 1: The four NPCS chip select lines are connected to a 4-bit to 16-bit decoder. When PCSDEC = 1, up to 15 Chip Select signals can be generated with the four NPCS lines using an external 4-bit to 16bit decoder. The Chip Select registers define the characteristics of the 15 chip selects, with the following rules: SPI_CSR0 defines peripheral chip select signals 0 to 3. SPI_CSR1 defines peripheral chip select signals 4 to 7. SPI_CSR2 defines peripheral chip select signals 8 to 11. SPI_CSR3 defines peripheral chip select signals 12 to 14. * MODFDIS: Mode Fault Detection 0: Mode fault detection enabled 1: Mode fault detection disabled * WDRBT: Wait Data Read Before Transfer 0: No Effect. In Master mode, a transfer can be initiated regardless of the SPI_RDR state. 1: In Master mode, a transfer can start only if the SPI_RDR is empty, i.e., does not contain any unread data. This mode prevents overrun error in reception. 706 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * LLB: Local Loopback Enable 0: Local loopback path disabled. 1: Local loopback path enabled. LLB controls the local loopback on the data shift register for testing in Master mode only (MISO is internally connected on MOSI). * PCS: Peripheral Chip Select This field is only used if fixed peripheral select is active (PS = 0). If SPI_MR.PCSDEC = 0: PCS = xxx0 NPCS[3:0] = 1110 PCS = xx01 NPCS[3:0] = 1101 PCS = x011 NPCS[3:0] = 1011 PCS = 0111 NPCS[3:0] = 0111 PCS = 1111 forbidden (no peripheral is selected) (x = don't care) If SPI_MR.PCSDEC = 1: NPCS[3:0] output signals = PCS. * DLYBCS: Delay Between Chip Selects This field defines the delay between the inactivation and the activation of NPCS. The DLYBCS time guarantees non-overlapping chip selects and solves bus contentions in case of peripherals having long data float times. If DLYBCS is lower than 6, six peripheral clock periods are inserted by default. Otherwise, the following equation determines the delay: DLYBCS Delay Between Chip Selects = --------------------------------f peripheral clock SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 707 33.8.3 SPI Receive Data Register Name: SPI_RDR Address: 0x40008008 Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - 15 14 13 12 PCS 11 10 9 8 3 2 1 0 RD 7 6 5 4 RD * RD: Receive Data Data received by the SPI Interface is stored in this register in a right-justified format. Unused bits are read as zero. * PCS: Peripheral Chip Select In Master mode only, these bits indicate the value on the NPCS pins at the end of a transfer. Otherwise, these bits are read as zero. Note: When using Variable peripheral select mode (PS = 1 in SPI_MR), it is mandatory to set the SPI_MR.WDRBT bit to 1 if the PCS field must be processed in SPI_RDR. 708 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.8.4 SPI Transmit Data Register Name: SPI_TDR Address: 0x4000800C Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - LASTXFER 23 22 21 20 19 18 17 16 - - - - 15 14 13 12 PCS 11 10 9 8 3 2 1 0 TD 7 6 5 4 TD * TD: Transmit Data Data to be transmitted by the SPI Interface is stored in this register. Information to be transmitted must be written to the transmit data register in a right-justified format. * PCS: Peripheral Chip Select This field is only used if variable peripheral select is active (PS = 1). If SPI_MR.PCSDEC = 0: PCS = xxx0 NPCS[3:0] = 1110 PCS = xx01 NPCS[3:0] = 1101 PCS = x011 NPCS[3:0] = 1011 PCS = 0111 NPCS[3:0] = 0111 PCS = 1111 forbidden (no peripheral is selected) (x = don't care) If SPI_MR.PCSDEC = 1: NPCS[3:0] output signals = PCS. * LASTXFER: Last Transfer 0: No effect 1: The current NPCS is de-asserted after the transfer of the character written in TD. When SPI_CSRx.CSAAT is set, the communication with the current serial peripheral can be closed by raising the corresponding NPCS line as soon as TD transfer is completed. This field is only used if variable peripheral select is active (SPI_MR.PS = 1). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 709 33.8.5 SPI Status Register Name: SPI_SR Address: 0x40008010 Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - SPIENS 15 14 13 12 11 10 9 8 - - - - - UNDES TXEMPTY NSSR 7 6 5 4 3 2 1 0 TXBUFE RXBUFF ENDTX ENDRX OVRES MODF TDRE RDRF * RDRF: Receive Data Register Full (cleared by reading SPI_RDR) 0: No data has been received since the last read of SPI_RDR. 1: Data has been received and the received data has been transferred from the shift register to SPI_RDR since the last read of SPI_RDR. * TDRE: Transmit Data Register Empty (cleared by writing SPI_TDR) 0: Data has been written to SPI_TDR and not yet transferred to the shift register. 1: The last data written in the SPI_TDR has been transferred to the shift register. TDRE equals zero when the SPI is disabled or at reset. The SPI enable command sets this bit to 1. * MODF: Mode Fault Error (cleared on read) 0: No mode fault has been detected since the last read of SPI_SR. 1: A mode fault occurred since the last read of SPI_SR. * OVRES: Overrun Error Status (cleared on read) 0: No overrun has been detected since the last read of SPI_SR. 1: An overrun has occurred since the last read of SPI_SR. An overrun occurs when SPI_RDR is loaded at least twice from the shift register since the last read of the SPI_RDR. * ENDRX: End of RX Buffer (cleared by writing SPI_RCR or SPI_RNCR) 0: The Receive Counter register has not reached 0 since the last write in SPI_RCR(1) or SPI_RNCR(1). 1: The Receive Counter register has reached 0 since the last write in SPI_RCR(1) or SPI_RNCR(1). * ENDTX: End of TX Buffer (cleared by writing SPI_TCR or SPI_TNCR) 0: The Transmit Counter register has not reached 0 since the last write in SPI_TCR(1) or SPI_TNCR(1). 1: The Transmit Counter register has reached 0 since the last write in SPI_TCR(1) or SPI_TNCR(1). * RXBUFF: RX Buffer Full (cleared by writing SPI_RCR or SPI_RNCR) 0: SPI_RCR(1) or SPI_RNCR(1) has a value other than 0. 1: Both SPI_RCR(1) and SPI_RNCR(1) have a value of 0. 710 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * TXBUFE: TX Buffer Empty (cleared by writing SPI_TCR or SPI_TNCR) 0: SPI_TCR(1) or SPI_TNCR(1) has a value other than 0. 1: Both SPI_TCR(1) and SPI_TNCR(1) have a value of 0. * NSSR: NSS Rising (cleared on read) 0: No rising edge detected on NSS pin since the last read of SPI_SR. 1: A rising edge occurred on NSS pin since the last read of SPI_SR. * TXEMPTY: Transmission Registers Empty (cleared by writing SPI_TDR) 0: As soon as data is written in SPI_TDR. 1: SPI_TDR and internal shift register are empty. If a transfer delay has been defined, TXEMPTY is set after the end of this delay. * UNDES: Underrun Error Status (Slave mode only) (cleared on read) 0: No underrun has been detected since the last read of SPI_SR. 1: A transfer starts whereas no data has been loaded in SPI_TDR. * SPIENS: SPI Enable Status 0: SPI is disabled. 1: SPI is enabled. Note: 1. SPI_RCR, SPI_RNCR, SPI_TCR, SPI_TNCR are PDC registers. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 711 33.8.6 SPI Interrupt Enable Register Name: SPI_IER Address: 0x40008014 Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - UNDES TXEMPTY NSSR 7 6 5 4 3 2 1 0 TXBUFE RXBUFF ENDTX ENDRX OVRES MODF TDRE RDRF The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Enables the corresponding interrupt. * RDRF: Receive Data Register Full Interrupt Enable * TDRE: SPI Transmit Data Register Empty Interrupt Enable * MODF: Mode Fault Error Interrupt Enable * OVRES: Overrun Error Interrupt Enable * ENDRX: End of Receive Buffer Interrupt Enable * ENDTX: End of Transmit Buffer Interrupt Enable * RXBUFF: Receive Buffer Full Interrupt Enable * TXBUFE: Transmit Buffer Empty Interrupt Enable * NSSR: NSS Rising Interrupt Enable * TXEMPTY: Transmission Registers Empty Enable * UNDES: Underrun Error Interrupt Enable 712 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.8.7 SPI Interrupt Disable Register Name: SPI_IDR Address: 0x40008018 Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - UNDES TXEMPTY NSSR 7 6 5 4 3 2 1 0 TXBUFE RXBUFF ENDTX ENDRX OVRES MODF TDRE RDRF The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Disables the corresponding interrupt. * RDRF: Receive Data Register Full Interrupt Disable * TDRE: SPI Transmit Data Register Empty Interrupt Disable * MODF: Mode Fault Error Interrupt Disable * OVRES: Overrun Error Interrupt Disable * ENDRX: End of Receive Buffer Interrupt Disable * ENDTX: End of Transmit Buffer Interrupt Disable * RXBUFF: Receive Buffer Full Interrupt Disable * TXBUFE: Transmit Buffer Empty Interrupt Disable * NSSR: NSS Rising Interrupt Disable * TXEMPTY: Transmission Registers Empty Disable * UNDES: Underrun Error Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 713 33.8.8 SPI Interrupt Mask Register Name: SPI_IMR Address: 0x4000801C Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - UNDES TXEMPTY NSSR 7 6 5 4 3 2 1 0 TXBUFE RXBUFF ENDTX ENDRX OVRES MODF TDRE RDRF The following configuration values are valid for all listed bit names of this register: 0: The corresponding interrupt is not enabled. 1: The corresponding interrupt is enabled. * RDRF: Receive Data Register Full Interrupt Mask * TDRE: SPI Transmit Data Register Empty Interrupt Mask * MODF: Mode Fault Error Interrupt Mask * OVRES: Overrun Error Interrupt Mask * ENDRX: End of Receive Buffer Interrupt Mask * ENDTX: End of Transmit Buffer Interrupt Mask * RXBUFF: Receive Buffer Full Interrupt Mask * TXBUFE: Transmit Buffer Empty Interrupt Mask * NSSR: NSS Rising Interrupt Mask * TXEMPTY: Transmission Registers Empty Mask * UNDES: Underrun Error Interrupt Mask 714 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.8.9 SPI Chip Select Register Name: SPI_CSRx[x=0..3] Address: 0x40008030 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 DLYBCT 23 22 21 20 DLYBS 15 14 13 12 SCBR 7 6 5 4 BITS 3 2 1 0 CSAAT CSNAAT NCPHA CPOL This register can only be written if the WPEN bit is cleared in the SPI Write Protection Mode Register. Note: SPI_CSRx registers must be written even if the user wants to use the default reset values. The BITS field is not updated with the translated value unless the register is written. * CPOL: Clock Polarity 0: The inactive state value of SPCK is logic level zero. 1: The inactive state value of SPCK is logic level one. CPOL is used to determine the inactive state value of the serial clock (SPCK). It is used with NCPHA to produce the required clock/data relationship between master and slave devices. * NCPHA: Clock Phase 0: Data is changed on the leading edge of SPCK and captured on the following edge of SPCK. 1: Data is captured on the leading edge of SPCK and changed on the following edge of SPCK. NCPHA determines which edge of SPCK causes data to change and which edge causes data to be captured. NCPHA is used with CPOL to produce the required clock/data relationship between master and slave devices. * CSNAAT: Chip Select Not Active After Transfer (Ignored if CSAAT = 1) 0: The Peripheral Chip Select does not rise between two transfers if the SPI_TDR is reloaded before the end of the first transfer and if the two transfers occur on the same Chip Select. 1: The Peripheral Chip Select rises systematically after each transfer performed on the same slave. It remains inactive after the end of transfer for a minimal duration of: DLYBCS --------------------------------(If field DLYBCS is lower than 6, a minimum of six periods is introduced.) f peripheral clock * CSAAT: Chip Select Active After Transfer 0: The Peripheral Chip Select Line rises as soon as the last transfer is achieved. 1: The Peripheral Chip Select does not rise after the last transfer is achieved. It remains active until a new transfer is requested on a different chip select. * BITS: Bits Per Transfer (See the note below the register bitmap.) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 715 The BITS field determines the number of data bits transferred. Reserved values should not be used. Value Name Description 0 8_BIT 8 bits for transfer 1 9_BIT 9 bits for transfer 2 10_BIT 10 bits for transfer 3 11_BIT 11 bits for transfer 4 12_BIT 12 bits for transfer 5 13_BIT 13 bits for transfer 6 14_BIT 14 bits for transfer 7 15_BIT 15 bits for transfer 8 16_BIT 16 bits for transfer 9 - Reserved 10 - Reserved 11 - Reserved 12 - Reserved 13 - Reserved 14 - Reserved 15 - Reserved * SCBR: Serial Clock Bit Rate In Master mode, the SPI Interface uses a modulus counter to derive the SPCK bit rate from the peripheral clock. The bit rate is selected by writing a value from1 to 255 in the SCBR field. The following equation determines the SPCK bit rate: SCBR = fperipheral clock / SPCK Bit Rate Programming the SCBR field to 0 is forbidden. Triggering a transfer while SCBR is at 0 can lead to unpredictable results. If BRSRCCLK = 1 in SPI_MR, SCBR must be programmed with a value greater than 1. At reset, SCBR is 0 and the user has to program it at a valid value before performing the first transfer. Note: If one of the SCBR fields in SPI_CSRx is set to 1, the other SCBR fields in SPI_CSRx must be set to 1 as well, if they are used to process transfers. If they are not used to transfer data, they can be set at any value. * DLYBS: Delay Before SPCK This field defines the delay from NPCS falling edge (activation) to the first valid SPCK transition. When DLYBS = 0, the delay is half the SPCK clock period. Otherwise, the following equation determines the delay: DLYBS = Delay Before SPCK x fperipheral clock * DLYBCT: Delay Between Consecutive Transfers This field defines the delay between two consecutive transfers with the same peripheral without removing the chip select. The delay is always inserted after each transfer and before removing the chip select if needed. When DLYBCT = 0, no delay between consecutive transfers is inserted and the clock keeps its duty cycle over the character transfers. Otherwise, the following equation determines the delay: DLYBCT = Delay Between Consecutive Transfers x fperipheral clock / 32 716 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 33.8.10 SPI Write Protection Mode Register Name: SPI_WPMR Address: 0x400080E4 Access: Read/Write. 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 6 5 4 3 2 1 0 - - - - - - - WPEN * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x535049 ("SPI" in ASCII) 1: Enables the write protection if WPKEY corresponds to 0x535049 ("SPI" in ASCII) See Section 33.7.5 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protection Key Value 0x535049 Name PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 717 33.8.11 SPI Write Protection Status Register Name: SPI_WPSR Address: 0x400080E8 Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 WPVSRC 7 6 5 4 3 2 1 0 - - - - - - - WPVS * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of SPI_WPSR. 1: A write protection violation has occurred since the last read of SPI_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. 718 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 34. Two-wire Interface (TWI) 34.1 Description The Atmel Two-wire Interface (TWI) interconnects components on a unique two-wire bus, made up of one clock line and one data line with speeds of up to 400 Kbits per second, based on a byte-oriented transfer format. It can be used with any Atmel Two-wire Interface bus Serial EEPROM and IC compatible device such as a Real Time Clock (RTC), Dot Matrix/Graphic LCD Controllers and temperature sensor. The TWI is programmable as a master or a slave with sequential or single-byte access. Multiple master capability is supported. A configurable baud rate generator permits the output data rate to be adapted to a wide range of core clock frequencies. Table 34-1 lists the compatibility level of the Atmel Two-wire Interface in Master mode and a full I2C compatible device. Atmel TWI Compatibility with I2C Standard Table 34-1. I2C Standard Atmel TWI Standard Mode Speed (100 kHz) Supported Fast Mode Speed (400 kHz) Supported 7- or 10-bit Slave Addressing Supported (1) START byte Not Supported Repeated Start (Sr) Condition Supported ACK and NACK Management Supported Slope Control and Input Filtering (Fast mode) Not Supported Clock Stretching/Synchronization Supported Multi Master Capability Supported Note: 34.2 1. START + b000000001 + Ack + Sr Embedded Characteristics Compatible with Atmel Two-wire Interface Serial Memory and IC Compatible Devices(1) One, Two or Three Bytes for Slave Address Sequential Read/Write Operations Master, Multi-master and Slave Mode Operation Bit Rate: Up to 400 Kbit/s General Call Supported in Slave Mode SMBus Quick Command Supported in Master Mode Connection to Peripheral DMA Controller (PDC) Channel Capabilities Optimizes Data Transfers Note: One Channel for the Receiver, One Channel for the Transmitter 1. See Table 34-1 for details on compatibility with IC Standard. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 719 34.3 List of Abbreviations Table 34-2. 34.4 Abbreviations Abbreviation Description TWI Two-wire Interface A Acknowledge NA Non Acknowledge P Stop S Start Sr Repeated Start SADR Slave Address ADR Any address except SADR R Read W Write Block Diagram Figure 34-1. Block Diagram Bus clock Peripheral Bridge TWCK PIO PMC Peripheral clock TWD Two-wire Interface TWI Interrupt 34.5 I/O Lines Description Table 34-3. 720 Interrupt Controller I/O Lines Description Name Description TWD Two-wire Serial Data (drives external serial data line - SDA) Input/Output TWCK Two-wire Serial Clock (drives external serial clock line - SCL) Input/Output SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Type 34.6 Product Dependencies 34.6.1 I/O Lines Both TWD and TWCK are bidirectional lines, connected to a positive supply voltage via a current source or pull-up resistor. When the bus is free, both lines are high. The output stages of devices connected to the bus must have an open-drain or open-collector to perform the wired-AND function. TWD and TWCK pins may be multiplexed with PIO lines. To enable the TWI, the user must program the PIO Controller to dedicate TWD and TWCK as peripheral lines. The user must not program TWD and TWCK as open-drain. This is already done by the hardware. Table 34-4. I/O Lines Instance Signal I/O Line Peripheral TWI0 TWCK0 PA4 A TWI0 TWD0 PA3 A TWI1 TWCK1 PB5 A TWI1 TWD1 PB4 A 34.6.2 Power Management The TWI may be clocked through the Power Management Controller (PMC), thus the user must first configure the PMC to enable the TWI clock. 34.6.3 Interrupt Sources The TWI has an interrupt line connected to the Interrupt Controller. In order to handle interrupts, the Interrupt Controller must be programmed before configuring the TWI. Table 34-5. 34.7 Peripheral IDs Instance ID TWI0 19 TWI1 20 Functional Description 34.7.1 Transfer Format The data put on the TWD line must be 8 bits long. Data is transferred MSB first; each byte must be followed by an acknowledgement. The number of bytes per transfer is unlimited (see Figure 34-3). Each transfer begins with a START condition and terminates with a STOP condition (see Figure 34-2). A high-to-low transition on the TWD line while TWCK is high defines the START condition. A low-to-high transition on the TWD line while TWCK is high defines the STOP condition. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 721 Figure 34-2. START and STOP Conditions TWD TWCK Start Figure 34-3. Stop Transfer Format TWD TWCK Start Address R/W Ack 34.7.2 Modes of Operation The TWI has different modes of operations: Master transmitter mode Master receiver mode Multi-master transmitter mode Multi-master receiver mode Slave transmitter mode Slave receiver mode These modes are described in the following sections. 722 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Data Ack Data Ack Stop 34.7.3 Master Mode 34.7.3.1 Definition The master is the device that starts a transfer, generates a clock and stops it. 34.7.3.2 Application Block Diagram Figure 34-4. Master Mode Typical Application Block Diagram VDD Rp* Rp* Host with TWI TWD TWCK SDA SCL Atmel TWI Serial EEPROM Slave 1 IC RTC IC LCD Controller IC Temperature Sensor Slave 2 Slave 3 Slave 4 * Rp: Pull-up value as given by the IC Standard 34.7.3.3 Programming Master Mode The following fields must be programmed before entering Master mode: 1. TWI_MMR.DADR (+ IADRSZ + IADR if a 10-bit device is addressed): The device address is used to access slave devices in Read or Write mode. 2. TWI_CWGR.CKDIV + CHDIV + CLDIV: Clock waveform. 3. TWI_CR.SVDIS: Disables the Slave mode 4. TWI_CR.MSEN: Enables the Master mode Note: 34.7.3.4 If the TWI is already in Master mode, the device address (DADR) can be configured without disabling the Master mode. Master Transmitter Mode After the master initiates a START condition when writing into the Transmit Holding register (TWI_THR), it sends a 7-bit slave address, configured in the Master Mode register (DADR in TWI_MMR), to notify the slave device. The bit following the slave address indicates the transfer direction--0 in this case (MREAD = 0 in TWI_MMR). The TWI transfers require the slave to acknowledge each received byte. During the acknowledge clock pulse (9th pulse), the master releases the data line (HIGH), enabling the slave to pull it down in order to generate the acknowledge. If the slave does not acknowledge the byte, then the Not Acknowledge flag (NACK) is set in the TWI Status Register (TWI_SR) of the master and a STOP condition is sent. The NACK flag must be cleared by reading the TWI Status Register (TWI_SR) before the next write into the TWI Transmit Holding Register(TWI_THR). As with the other status bits, an interrupt can be generated if enabled in the Interrupt Enable register (TWI_IER). If the slave acknowledges the byte, the data written in the TWI_THR is then shifted in the internal shifter and transferred. When an acknowledge is detected, the TXRDY bit is set until a new write in the TWI_THR. TXRDY is used as Transmit Ready for the PDC transmit channel. While no new data is written in the TWI_THR, the serial clock line (SCL) is tied low. When new data is written in the TWI_THR, the TWCK/SCL is released and the data is sent. Setting the STOP bit in TWI_CR generates a STOP condition. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 723 After a master write transfer, the SCL is stretched (tied low) as long as no new data is written in the TWI_THR or until a STOP command is performed. See Figure 34-5, Figure 34-6, and Figure 34-7. Figure 34-5. Master Write with One Data Byte STOP Command sent (write in TWI_CR) S TWD DADR W A DATA A P TXCOMP TXRDY Write THR (DATA) Figure 34-6. Master Write with Multiple Data Bytes STOP command performed (by writing in the TWI_CR) TWD S DADR W A DATA n A DATA n+1 A DATA n+2 TWCK TXCOMP TXRDY Write THR (Data n) Write THR (Data n+1) 724 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Write THR (Data n+2) Last data sent A P Figure 34-7. Master Write with One Byte Internal Address and Multiple Data Bytes STOP command performed (by writing in the TWI_CR) TWD S DADR W A IADR A DATA n A DATA n+1 A DATA n+2 A P TWCK TXCOMP TXRDY Write THR (Data n) Write THR (Data n+1) 34.7.3.5 Write THR (Data n+2) Last data sent Master Receiver Mode The read sequence begins by setting the START bit. After the START condition has been sent, the master sends a 7-bit slave address to notify the slave device. The bit following the slave address indicates the transfer direction--1 in this case (MREAD = 1 in TWI_MMR). During the acknowledge clock pulse (9th pulse), the master releases the data line (HIGH), enabling the slave to pull it down in order to generate the acknowledge. The master polls the data line during this clock pulse and sets the NACK bit in the TWI_SR if the slave does not acknowledge the byte. If an acknowledge is received, the master is then ready to receive data from the slave. After data has been received, the master sends an acknowledge condition to notify the slave that the data has been received except for the last data. See Figure 34-8. When the RXRDY bit is set in the TWI_SR, a character has been received in the Receive Holding Register (TWI_RHR). The RXRDY bit is reset when reading the TWI_RHR. RXRDY is used as Receive Ready for the PDC receive channel. When a single data byte read is performed, with or without internal address (IADR), the START and STOP bits must be set at the same time. See Figure 34-8. When a multiple data byte read is performed, with or without internal address (IADR), the STOP bit must be set after the next-to-last data received. See Figure 34-9. For internal address usage, see Section 34.7.3.6. Figure 34-8. Master Read with One Data Byte TWD S DADR R A DATA NA P TXCOMP Write START & STOP Bit RXRDY Read RHR SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 725 Figure 34-9. Master Read with Multiple Data Bytes TWD S DADR R A DATA n A DATA (n+1) A DATA (n+m)-1 A DATA (n+m) NA P TXCOMP Write START Bit RXRDY Read RHR DATA n Read RHR DATA (n+1) Read RHR DATA (n+m)-1 Read RHR DATA (n+m) Write STOP Bit after next-to-last data read 34.7.3.6 Internal Address The TWI can perform transfers with 7-bit slave address devices and 10-bit slave address devices. 7-bit Slave Addressing When addressing 7-bit slave devices, the internal address bytes are used to perform random address (read or write) accesses to reach one or more data bytes, e.g. within a memory page location in a serial memory. When performing read operations with an internal address, the TWI performs a write operation to set the internal address into the slave device, and then switch to Master receiver mode. Note that the second START condition (after sending the IADR) is sometimes called "repeated start" (Sr) in I2C fully-compatible devices. See Figure 34-11. See Figure 34-10 and Figure 34-12 for master write operation with internal address. The three internal address bytes are configurable through the Master Mode register (TWI_MMR). If the slave device supports only a 7-bit address, i.e., no internal address, IADRSZ must be set to 0. Table 34-6 shows the abbreviations used in Figure 34-10 and Figure 34-11. Table 34-6. 726 Abbreviations Abbreviation Definition S Start Sr Repeated Start P Stop W Write R Read A Acknowledge NA Not Acknowledge DADR Device Address IADR Internal Address SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 34-10. Master Write with One, Two or Three Bytes Internal Address and One Data Byte Three bytes internal address S TWD DADR W A IADR(23:16) A IADR(15:8) A IADR(7:0) A W A IADR(15:8) A IADR(7:0) A DATA A W A IADR(7:0) A DATA A DATA A P Two bytes internal address S TWD DADR P One byte internal address S TWD DADR P Figure 34-11. Master Read with One, Two or Three Bytes Internal Address and One Data Byte Three bytes internal address S TWD DADR W A IADR(23:16) A A IADR(15:8) IADR(7:0) Sr A DADR R A DATA NA P Two bytes internal address S TWD DADR W A IADR(15:8) A IADR(7:0) A Sr W A IADR(7:0) A Sr R A DADR R A DATA NA P One byte internal address TWD S DADR DADR DATA NA P 10-bit Slave Addressing For a slave address higher than seven bits, the user must configure the address size (IADRSZ) and set the other slave address bits in the Internal Address register (TWI_IADR). The two remaining internal address bytes, IADR[15:8] and IADR[23:16] can be used the same way as in 7-bit slave addressing. Example: Address a 10-bit device (10-bit device address is b1 b2 b3 b4 b5 b6 b7 b8 b9 b10) 1. Program IADRSZ = 1, 2. Program DADR with 1 1 1 1 0 b1 b2 (b1 is the MSB of the 10-bit address, b2, etc.) 3. Program TWI_IADR with b3 b4 b5 b6 b7 b8 b9 b10 (b10 is the LSB of the 10-bit address) Figure 34-12 below shows a byte write to an Atmel AT24LC512 EEPROM. This demonstrates the use of internal addresses to access the device. Figure 34-12. Internal Address Usage S T A R T Device Address W R I T E FIRST WORD ADDRESS SECOND WORD ADDRESS S T O P DATA 0 M S B 34.7.3.7 LR A S / C BW K M S B A C K LA SC BK A C K Using the Peripheral DMA Controller (PDC) The use of the PDC significantly reduces the CPU load. To ensure correct implementation, proceed as follows. Data Transmit with the PDC 1. Initialize the transmit PDC (memory pointers, transfer size - 1). 2. Configure the master (DADR, CKDIV, MREAD = 0, etc.) 3. Start the transfer by setting the PDC TXTEN bit. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 727 4. Wait for the PDC ENDTX Flag either by using the polling method or ENDTX interrupt. 5. Disable the PDC by setting the PDC TXTDIS bit. 6. Wait for the TXRDY flag in TWI_SR. 7. Set the STOP bit in TWI_CR. 8. Write the last character in TWI_THR. 9. (Only if peripheral clock must be disabled) Wait for the TXCOMP flag to be raised in TWI_SR. Data Receive with the PDC The PDC transfer size must be defined with the buffer size minus 2. The two remaining characters must be managed without PDC to ensure that the exact number of bytes are received regardless of system bus latency conditions encountered during the end of buffer transfer period. In Slave mode, the number of characters to receive must be known in order to configure the PDC. 1. Initialize the receive PDC (memory pointers, transfer size - 2). 2. Configure the master (DADR, CKDIV, MREAD = 1, etc.) 3. Set the PDC RXTEN bit. 4. (Master Only) Write the START bit in the TWI_CR to start the transfer. 5. Wait for the PDC ENDRX Flag either by using polling method or ENDRX interrupt. 6. Disable the PDC by setting the PDC RXTDIS bit. 7. Wait for the RXRDY flag in TWI_SR. 8. Set the STOP bit in TWI_CR. 9. Read the penultimate character in TWI_RHR. 10. Wait for the RXRDY flag in TWI_SR. 11. Read the last character in TWI_RHR. 12. (Only if peripheral clock must be disabled) Wait for the TXCOMP flag to be raised in TWI_SR. 34.7.3.8 SMBus Quick Command (Master Mode Only) The TWI can perform a quick command: 1. Configure the Master mode (DADR, CKDIV, etc.). 2. Write the MREAD bit in the TWI_MMR at the value of the one-bit command to be sent. 3. Start the transfer by setting the QUICK bit in the TWI_CR. Figure 34-13. SMBus Quick Command TWD S DADR R/W A P TXCOMP TXRDY Write QUICK command in TWI_CR 34.7.3.9 Read/Write Flowcharts The flowcharts in the following figures provide examples of read and write operations. A polling or interrupt method can be used to check the status bits. The interrupt method requires that the Interrupt Enable Register (TWI_IER) be configured first. 728 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 34-14. TWI Write Operation with Single Data Byte without Internal Address BEGIN Set TWI clock (CLDIV, CHDIV, CKDIV) in TWI_CWGR (Needed only once) Set the Control register: - Master enable TWI_CR = MSEN + SVDIS Set the Master Mode register: - Device slave address (DADR) - Transfer direction bit Write ==> bit MREAD = 0 Load Transmit register TWI_THR = Data to send Write STOP Command TWI_CR = STOP Read Status register No TXRDY = 1? Yes Read Status register No TXCOMP = 1? Yes Transfer finished SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 729 Figure 34-15. TWI Write Operation with Single Data Byte and Internal Address BEGIN Set TWI clock (CLDIV, CHDIV, CKDIV) in TWI_CWGR (Needed only once) Set the Control register: - Master enable TWI_CR = MSEN + SVDIS Set the Master Mode register: - Device slave address (DADR) - Internal address size (IADRSZ) - Transfer direction bit Write ==> bit MREAD = 0 Set the internal address TWI_IADR = address Load transmit register TWI_THR = Data to send Write STOP command TWI_CR = STOP Read Status register No TXRDY = 1? Yes Read Status register TXCOMP = 1? No Yes Transfer finished 730 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 34-16. TWI Write Operation with Multiple Data Bytes with or without Internal Address BEGIN Set TWI clock (CLDIV, CHDIV, CKDIV) in TWI_CWGR (Needed only once) Set the Control register: - Master enable TWI_CR = MSEN + SVDIS Set the Master Mode register: - Device slave address - Internal address size (if IADR used) - Transfer direction bit Write ==> bit MREAD = 0 No Internal address size = 0? Set the internal address TWI_IADR = address Yes Load Transmit register TWI_THR = Data to send Read Status register TWI_THR = data to send No TXRDY = 1? Yes Data to send? Yes No Write STOP Command TWI_CR = STOP Read Status register No TXCOMP = 1? Yes END SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 731 Figure 34-17. TWI Read Operation with Single Data Byte without Internal Address BEGIN Set TWI clock (CLDIV, CHDIV, CKDIV) in TWI_CWGR (Needed only once) Set the Control register: - Master enable TWI_CR = MSEN + SVDIS Set the Master Mode register: - Device slave address - Transfer direction bit Read ==> bit MREAD = 1 Start the transfer TWI_CR = START | STOP Read status register RXRDY = 1? No Yes Read Receive Holding Register Read Status register No TXCOMP = 1? Yes END 732 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 34-18. TWI Read Operation with Single Data Byte and Internal Address BEGIN Set TWI clock (CLDIV, CHDIV, CKDIV) in TWI_CWGR (Needed only once) Set the Control register: - Master enable TWI_CR = MSEN + SVDIS Set the Master Mode register: - Device slave address - Internal address size (IADRSZ) - Transfer direction bit Read ==> bit MREAD = 1 Set the internal address TWI_IADR = address Start the transfer TWI_CR = START | STOP Read Status register No RXRDY = 1? Yes Read Receive Holding register Read Status register No TXCOMP = 1? Yes END SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 733 Figure 34-19. TWI Read Operation with Multiple Data Bytes with or without Internal Address BEGIN Set TWI clock (CLDIV, CHDIV, CKDIV) in TWI_CWGR (Needed only once) Set the Control register: - Master enable TWI_CR = MSEN + SVDIS Set the Master Mode register: - Device slave address - Internal address size (if IADR used) - Transfer direction bit Read ==> bit MREAD = 1 No Internal address size = 0? Set the internal address TWI_IADR = address Yes Start the transfer TWI_CR = START Read Status register RXRDY = 1? No Yes Read Receive Holding register (TWI_RHR) No Last data to read but one? Yes Stop the transfer TWI_CR = STOP Read Status register No RXRDY = 1? Yes Read Receive Holding register (TWI_RHR) Read status register TXCOMP = 1? Yes END 734 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 No 34.7.4 Multi-master Mode 34.7.4.1 Definition In Multi-master mode, more than one master may handle the bus at the same time without data corruption by using arbitration. Arbitration starts as soon as two or more masters place information on the bus at the same time, and stops (arbitration is lost) for the master that intends to send a logical one while the other master sends a logical zero. As soon as a master lose arbitration, it stops sending data and listens to the bus in order to detect a stop. When the stop is detected, the master may put its data on the bus by performing arbitration. Arbitration is illustrated in Figure 34-21. 34.7.4.2 Two Multi-master Modes Two Multi-master modes may be distinguished: 1. TWI is considered as a master only and will never be addressed. 2. Note: TWI may be either a master or a slave and may be addressed. Arbitration is supported in both Multi-master modes. TWI as Master Only In this mode, TWI is considered as a Master only (MSEN is always one) and must be driven like a Master with the ARBLST (Arbitration Lost) flag in addition. If arbitration is lost (ARBLST = 1), the user must reinitiate the data transfer. If the user starts a transfer (ex.: DADR + START + W + Write in THR) and if the bus is busy, the TWI automatically waits for a STOP condition on the bus to initiate the transfer (see Figure 34-20). Note: The state of the bus (busy or free) is not shown in the user interface. TWI as Master or Slave The automatic reversal from Master to Slave is not supported in case of a lost arbitration. Then, in the case where TWI may be either a Master or a Slave, the user must manage the pseudo Multi-master mode described in the steps below. 1. Program TWI in Slave mode (SADR + MSDIS + SVEN) and perform a slave access (if TWI is addressed). 2. If the TWI has to be set in Master mode, wait until the TXCOMP flag is at 1. 3. Program the Master mode (DADR + SVDIS + MSEN) and start the transfer (ex: START + Write in THR). 4. As soon as the Master mode is enabled, the TWI scans the bus in order to detect if it is busy or free. When the bus is considered free, TWI initiates the transfer. 5. As soon as the transfer is initiated and until a STOP condition is sent, the arbitration becomes relevant and the user must monitor the ARBLST flag. 6. If the arbitration is lost (ARBLST is set to 1), the user must program the TWI in Slave mode in case the Master that won the arbitration is required to access the TWI. 7. If the TWI has to be set in Slave mode, wait until TXCOMP flag is at 1 and then program the Slave mode. Note: If the arbitration is lost and the TWI is addressed, the TWI will not acknowledge even if it is programmed in Slave mode as soon as ARBLST is set to 1. Then the Master must repeat SADR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 735 Figure 34-20. Programmer Sends Data While the Bus is Busy TWCK START sent by the TWI STOP sent by the master DATA sent by a master TWD DATA sent by the TWI Bus is busy Bus is free Transfer is kept TWI DATA transfer A transfer is programmed (DADR + W + START + Write THR) Bus is considered as free Transfer is initiated Figure 34-21. Arbitration Cases TWCK TWD TWCK Data from a Master S 1 0 0 1 1 Data from TWI S 1 0 TWD S 1 0 0 1 P Arbitration is lost TWI stops sending data Data from the master 1 1 P Arbitration is lost S 1 0 1 S 1 0 0 1 1 S 1 0 0 1 1 The master stops sending data Data from the TWI ARBLST Bus is busy Transfer is kept TWI DATA transfer A transfer is programmed (DADR + W + START + Write THR) Bus is free Transfer is stopped Transfer is programmed again (DADR + W + START + Write THR) Bus is considered as free Transfer is initiated The flowchart shown in Figure 34-22 gives an example of read and write operations in Multi-master mode. 736 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 34-22. Multi-master Flowchart START Programm the SLAVE mode: SADR + MSDIS + SVEN Read Status Register SVACC = 1 ? Yes GACC = 1 ? No No No SVREAD = 1 ? No EOSACC = 1 ? TXRDY= 1 ? Yes Yes Yes No Write in TWI_THR TXCOMP = 1 ? No RXRDY= 1 ? Yes No No Yes Read TWI_RHR Need to perform a master access ? GENERAL CALL TREATMENT Yes Decoding of the programming sequence No Prog seq OK ? Change SADR Program the Master mode DADR + SVDIS + MSEN + CLK + R / W Read Status Register Yes No ARBLST = 1 ? Yes Yes MREAD = 1 ? RXRDY= 0 ? No TXRDY= 0 ? No Read TWI_RHR Yes Yes No Data to read? Data to send ? No Yes Write in TWI_THR No Stop transfer Read Status Register Yes TXCOMP = 0 ? No 34.7.5 Slave Mode 34.7.5.1 Definition Slave mode is defined as a mode where the device receives the clock and the address from another device called the master. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 737 In this mode, the device never initiates and never completes the transmission (START, REPEATED START and STOP conditions are always provided by the master). 34.7.5.2 Application Block Diagram Figure 34-23. Slave Mode Typical Application Block Diagram VDD Master R R Host with TWI TWD SDA TWCK SCL 34.7.5.3 Host with TWI Host with TWI LCD Controller Slave 1 Slave 2 Slave 3 Programming Slave Mode The following fields must be programmed before entering Slave mode: 1. TWI_SMR.SADR: The slave device address is used in order to be accessed by master devices in Read or Write mode. 2. TWI_CR.MSDIS: Disables the Master mode. 3. TWI_CR.SVEN: Enables the Slave mode. As the device receives the clock, values written in TWI_CWGR are ignored. 34.7.5.4 Receiving Data After a START or REPEATED START condition is detected and if the address sent by the Master matches with the Slave address programmed in the SADR (Slave Address) field, SVACC (Slave Access) flag is set and SVREAD (Slave Read) indicates the direction of the transfer. SVACC remains high until a STOP condition or a repeated START is detected. When such a condition is detected, the EOSACC (End Of Slave Access) flag is set. Read Sequence In the case of a read sequence (SVREAD is high), TWI transfers data written in the TWI_THR (TWI Transmit Holding Register) until a STOP condition or a REPEATED_START + an address different from SADR is detected. Note that at the end of the read sequence TXCOMP (Transmission Complete) flag is set and SVACC reset. As soon as data is written in the TWI_THR, the TXRDY (Transmit Holding Register Ready) flag is reset, and it is set when the internal shifter is empty and the sent data acknowledged or not. If the data is not acknowledged, the NACK flag is set. Note that a STOP or a REPEATED START always follows a NACK. See Figure 34-24. Write Sequence In the case of a write sequence (SVREAD is low), the RXRDY (Receive Holding Register Ready) flag is set as soon as a character has been received in the TWI_RHR (TWI Receive Holding Register). RXRDY is reset when reading the TWI_RHR. TWI continues receiving data until a STOP condition or a REPEATED_START + an address different from SADR is detected. Note that at the end of the write sequence TXCOMP flag is set and SVACC reset. 738 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 See Figure 34-25. Clock Synchronization Sequence If TWI_RHR is not read in time, the TWI performs a clock synchronization. Clock synchronization information is given by the bit SCLWS (Clock Wait State). See Figure 34-28. Clock Stretching Sequence If TWI_THR is not written in time, the TWI performs a clock stretching. Clock stretching information is given by the bit SCLWS (Clock Wait State). See Figure 34-27. General Call In the case where a GENERAL CALL is performed, the GACC (General Call Access) flag is set. After GACC is set, the user must interpret the meaning of the GENERAL CALL and decode the new address programming sequence. See Figure 34-26. 34.7.5.5 Data Transfer Read Operation The Read mode is defined as a data requirement from the master. After a START or a REPEATED START condition is detected, the decoding of the address starts. If the slave address (SADR) is decoded, SVACC is set and SVREAD indicates the direction of the transfer. Until a STOP or REPEATED START condition is detected, TWI continues sending data loaded in the TWI_THR. If a STOP condition or a REPEATED START + an address different from SADR is detected, SVACC is reset. Figure 34-24 describes the write operation. Figure 34-24. Read Access Ordered by a Master SADR matches, TWI answers with an ACK SADR does not match, TWI answers with a NACK TWD S ADR R NA DATA NA P/S/Sr SADR R A DATA A ACK/NACK from the Master A DATA NA S/Sr TXRDY NACK Read RHR Write THR SVACC SVREAD SVREAD has to be taken into account only while SVACC is active EOSACC Notes: 1. When SVACC is low, the state of SVREAD becomes irrelevant. 2. TXRDY is reset when data has been transmitted from TWI_THR to the internal shifter and set when this data has been acknowledged or non acknowledged. Write Operation The Write mode is defined as a data transmission from the master. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 739 After a START or a REPEATED START, the decoding of the address starts. If the slave address is decoded, SVACC is set and SVREAD indicates the direction of the transfer (SVREAD is low in this case). Until a STOP or REPEATED START condition is detected, TWI stores the received data in the TWI_RHR. If a STOP condition or a REPEATED START + an address different from SADR is detected, SVACC is reset. Figure 34-25 describes the write operation. Figure 34-25. Write Access Ordered by a Master SADR does not match, TWI answers with a NACK TWD S ADR W NA DATA NA SADR matches, TWI answers with an ACK P/S/Sr SADR W A DATA Read RHR A A DATA NA S/Sr RXRDY SVACC SVREAD has to be taken into account only while SVACC is active SVREAD EOSACC Notes: 1. When SVACC is low, the state of SVREAD becomes irrelevant. 2. RXRDY is set when data has been transmitted from the internal shifter to the TWI_RHR and reset when this data is read. General Call The general call is performed in order to change the address of the slave. If a GENERAL CALL is detected, GACC is set. After the detection of GENERAL CALL, it is up to the programmer to decode the commands which come afterwards. In case of a WRITE command, the programmer has to decode the programming sequence and program a new SADR if the programming sequence matches. Figure 34-26 describes the GENERAL CALL access. Figure 34-26. Master Performs a General Call 0000000 + W TXD S GENERAL CALL RESET command = 00000110X WRITE command = 00000100X A Reset or write DADD A DATA1 A DATA2 A New SADR A P New SADR Programming sequence GACC Reset after read SVACC Note: 740 This method allows the user to create a personal programming sequence by choosing the programming bytes and the number of them. The programming sequence has to be provided to the master. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Clock Synchronization/Stretching In both Read and Write modes, it may occur that TWI_THR/TWI_RHR buffer is not filled /emptied before transmission/reception of a new character. In this case, to avoid sending/receiving undesired data, a clock stretching/synchronization mechanism is implemented. Clock Stretching in Read Mode The clock is tied low during the acknowledge phase if the internal shifter is empty and if a STOP or REPEATED START condition was not detected. It is tied low until the internal shifter is loaded. Figure 34-27 describes clock stretching in Read mode. Figure 34-27. Clock Stretching in Read Mode TWI_THR S SADR R DATA1 1 DATA0 A DATA0 A DATA1 DATA2 A XXXXXXX DATA2 NA S 2 TWCK Write THR CLOCK is tied low by the TWI as long as THR is empty SCLWS TXRDY SVACC SVREAD As soon as a START is detected TXCOMP TWI_THR is transmitted to the shift register Notes: Ack or Nack from the master 1 The data is memorized in TWI_THR until a new value is written 2 The clock is stretched after the ACK, the state of TWD is undefined during clock stretching 1. TXRDY is reset when data has been written in the TWI_THR to the internal shifter and set when this data has been acknowledged or non acknowledged. 2. At the end of the read sequence, TXCOMP is set after a STOP or after a REPEATED_START + an address different from SADR. 3. SCLWS is automatically set when the clock stretching mechanism is started. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 741 Clock Synchronization in Write Mode The clock is tied low outside of the acknowledge phase if the internal shifter and the TWI_RHR is full. If a STOP or REPEATED_START condition was not detected, it is tied low until TWI_RHR is read. Figure 34-28 describes the clock synchronization in Write mode. Figure 34-28. Clock Synchronization in Write Mode TWCK CLOCK is tied low by the TWI as long as RHR is full TWD S SADR W A DATA0 TWI_RHR A DATA1 A DATA0 is not read in the RHR DATA2 DATA1 NA S ADR DATA2 SCLWS TWCK is stretched on the last bit of DATA1 RXRDY Rd DATA0 Rd DATA1 Rd DATA2 SVACC SVREAD TXCOMP Notes: 742 As soon as a START is detected 1. At the end of the read sequence, TXCOMP is set after a STOP or after a REPEATED_START + an address different from SADR. 2. SCLWS is automatically set when the clock synchronization mechanism is started and automatically reset when the mechanism is finished. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Reversal After a Repeated Start Reversal of Read to Write The master initiates the communication by a read command and finishes it by a write command. Figure 34-29 describes the repeated start + reversal from Read to Write mode. Figure 34-29. Repeated Start + Reversal from Read to Write Mode TWI_THR TWD DATA0 S SADR R A DATA0 DATA1 A DATA1 NA Sr SADR W A DATA2 TWI_RHR A DATA3 DATA2 A P DATA3 SVACC SVREAD TXRDY RXRDY EOSACC Cleared after read As soon as a START is detected TXCOMP Note: 1. TXCOMP is only set at the end of the transmission because after the repeated start, SADR is detected again. Reversal of Write to Read The master initiates the communication by a write command and finishes it by a read command. Figure 34-30 describes the repeated start + reversal from Write to Read mode. Figure 34-30. Repeated Start + Reversal from Write to Read Mode DATA2 TWI_THR TWD S SADR W A DATA0 A TWI_RHR DATA1 DATA0 A Sr SADR R A DATA3 DATA2 A DATA3 NA P DATA1 SVACC SVREAD TXRDY RXRDY EOSACC TXCOMP Notes: 34.7.5.6 Read TWI_RHR Cleared after read As soon as a START is detected 1. In this case, if TWI_THR has not been written at the end of the read command, the clock is automatically stretched before the ACK. 2. TXCOMP is only set at the end of the transmission because after the repeated start, SADR is detected again. Using the Peripheral DMA Controller (PDC) in Slave Mode The use of the PDC significantly reduces the CPU load. Data Transmit with the PDC in Slave Mode The following procedure shows an example of data transmission with PDC. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 743 1. Initialize the transmit PDC (memory pointers, transfer size). 2. Start the transfer by setting the PDC TXTEN bit. 3. Wait for the PDC ENDTX flag by using either the polling method or the ENDTX interrupt. 4. Disable the PDC by setting the PDC TXTDIS bit. 5. (Only if peripheral clock must be disabled) Wait for the TXCOMP flag to be raised in TWI_SR. Data Receive with the PDC in Slave Mode The following procedure shows an example of data transmission with PDC where the number of characters to be received is known. 1. Initialize the receive PDC (memory pointers, transfer size). 34.7.5.7 2. Set the PDC RXTEN bit. 3. Wait for the PDC ENDRX flag by using either the polling method or the ENDRX interrupt. 4. Disable the PDC by setting the PDC RXTDIS bit. 5. (Only if peripheral clock must be disabled) Wait for the TXCOMP flag to be raised in TWI_SR. Read Write Flowcharts The flowchart shown in Figure 34-31 gives an example of read and write operations in Slave mode. A polling or interrupt method can be used to check the status bits. The interrupt method requires that the Interrupt Enable Register (TWI_IER) be configured first. 744 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 34-31. Read Write Flowchart in Slave Mode Set the SLAVE mode: SADR + MSDIS + SVEN Read Status Register SVACC = 1 ? No No EOSACC = 1 ? GACC = 1 ? No SVREAD = 1 ? TXRDY= 1 ? No No Write in TWI_THR No TXCOMP = 1 ? No RXRDY= 1 ? END Read TWI_RHR GENERAL CALL TREATMENT Decoding of the programming sequence No Prog seq OK ? Change SADR SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 745 34.8 Two-wire Interface (TWI) User Interface Table 34-7. Register Mapping Offset Register Name Access Reset 0x00 Control Register TWI_CR Write-only - 0x04 Master Mode Register TWI_MMR Read/Write 0x00000000 0x08 Slave Mode Register TWI_SMR Read/Write 0x00000000 0x0C Internal Address Register TWI_IADR Read/Write 0x00000000 0x10 Clock Waveform Generator Register TWI_CWGR Read/Write 0x00000000 0x14-0x1C Reserved - - - 0x20 Status Register TWI_SR Read-only 0x0000F009 0x24 Interrupt Enable Register TWI_IER Write-only - 0x28 Interrupt Disable Register TWI_IDR Write-only - 0x2C Interrupt Mask Register TWI_IMR Read-only 0x00000000 0x30 Receive Holding Register TWI_RHR Read-only 0x00000000 0x34 Transmit Holding Register TWI_THR Write-only - 0xEC-0xFC Reserved - - - 0x100-0x128 Reserved for PDC registers - - - Note: All unlisted offset values are considered as "reserved". 746 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 34.8.1 TWI Control Register Name: TWI_CR Address: 0x40018000 (0), 0x4001C000 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 SWRST 6 QUICK 5 SVDIS 4 SVEN 3 MSDIS 2 MSEN 1 STOP 0 START * START: Send a START Condition 0: No effect. 1: A frame beginning with a START bit is transmitted according to the features defined in the TWI Master Mode Register (TWI_MMR). This action is necessary for the TWI to read data from a slave. When configured in Master mode with a write operation, a frame is sent as soon as the user writes a character in the Transmit Holding Register (TWI_THR). * STOP: Send a STOP Condition 0: No effect. 1: STOP condition is sent just after completing the current byte transmission in Master read mode. - In single data byte master read, the START and STOP must both be set. - In multiple data bytes master read, the STOP must be set after the last data received but one. - In Master read mode, if a NACK bit is received, the STOP is automatically performed. - In master data write operation, a STOP condition is sent when transmission of the current data has ended. * MSEN: TWI Master Mode Enabled 0: No effect. 1: Enables the Master mode (MSDIS must be written to 0). Note: Switching from Slave to Master mode is only permitted when TXCOMP = 1. * MSDIS: TWI Master Mode Disabled 0: No effect. 1: The Master mode is disabled, all pending data is transmitted. The shifter and holding characters (if it contains data) are transmitted in case of write operation. In read operation, the character being transferred must be completely received before disabling. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 747 * SVEN: TWI Slave Mode Enabled 0: No effect. 1: Enables the Slave mode (SVDIS must be written to 0) Note: Switching from master to Slave mode is only permitted when TXCOMP = 1. * SVDIS: TWI Slave Mode Disabled 0: No effect. 1: The Slave mode is disabled. The shifter and holding characters (if it contains data) are transmitted in case of read operation. In write operation, the character being transferred must be completely received before disabling. * QUICK: SMBus Quick Command 0: No effect. 1: If Master mode is enabled, a SMBus Quick Command is sent. * SWRST: Software Reset 0: No effect. 1: Equivalent to a system reset. 748 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 34.8.2 TWI Master Mode Register Name: TWI_MMR Address: 0x40018004 (0), 0x4001C004 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 21 20 19 DADR 18 17 16 15 - 14 - 13 - 12 MREAD 11 - 10 - 9 7 - 6 - 5 - 4 - 3 - 2 - 1 - 8 IADRSZ 0 - * IADRSZ: Internal Device Address Size Value Name Description 0 NONE No internal device address 1 1_BYTE One-byte internal device address 2 2_BYTE Two-byte internal device address 3 3_BYTE Three-byte internal device address * MREAD: Master Read Direction 0: Master write direction. 1: Master read direction. * DADR: Device Address The device address is used to access slave devices in Read or Write mode. These bits are only used in Master mode. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 749 34.8.3 TWI Slave Mode Register Name: TWI_SMR Address: 0x40018008 (0), 0x4001C008 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 21 20 19 SADR 18 17 16 15 - 14 - 13 - 12 - 11 - 10 - 9 8 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - * SADR: Slave Address The slave device address is used in Slave mode in order to be accessed by master devices in Read or Write mode. SADR must be programmed before enabling the Slave mode or after a general call. Writes at other times have no effect. 750 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 34.8.4 TWI Internal Address Register Name: TWI_IADR Address: 0x4001800C (0), 0x4001C00C (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 2 1 0 IADR 15 14 13 12 IADR 7 6 5 4 IADR * IADR: Internal Address 0, 1, 2 or 3 bytes depending on IADRSZ. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 751 34.8.5 TWI Clock Waveform Generator Register Name: TWI_CWGR Address: 0x40018010 (0), 0x4001C010 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 17 CKDIV 16 15 14 13 12 11 10 9 8 3 2 1 0 CHDIV 7 6 5 4 CLDIV TWI_CWGR is only used in Master mode. * CLDIV: Clock Low Divider The TWCK low period is defined as follows: tlow = ((CLDIV x 2CKDIV) + 4 x tperipheral clock * CHDIV: Clock High Divider The TWCK high period is defined as follows: thigh = ((CHDIV x 2CKDIV) + 4 x tperipheral clock * CKDIV: Clock Divider The TWCK is used to increase both SCL high and low periods. 752 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 34.8.6 TWI Status Register Name: TWI_SR Address: 0x40018020 (0), 0x4001C020 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 TXBUFE 14 RXBUFF 13 ENDTX 12 ENDRX 11 EOSACC 10 SCLWS 9 ARBLST 8 NACK 7 - 6 OVRE 5 GACC 4 SVACC 3 SVREAD 2 TXRDY 1 RXRDY 0 TXCOMP * TXCOMP: Transmission Completed (cleared by writing TWI_THR) TXCOMP used in Master mode: 0: During the length of the current frame. 1: When both holding register and internal shifter are empty and STOP condition has been sent. TXCOMP behavior in Master mode can be seen in Figure 34-7 and in Figure 34-9. TXCOMP used in Slave mode: 0: As soon as a START is detected. 1: After a STOP or a REPEATED START + an address different from SADR is detected. TXCOMP behavior in Slave mode can be seen in Figure 34-27, Figure 34-28, Figure 34-29 and Figure 34-30. * RXRDY: Receive Holding Register Ready (cleared by reading TWI_RHR) 0: No character has been received since the last TWI_RHR read operation. 1: A byte has been received in the TWI_RHR since the last read. RXRDY behavior in Master mode can be seen in Figure 34-9. RXRDY behavior in Slave mode can be seen in Figure 34-25, Figure 34-28, Figure 34-29 and Figure 34-30. * TXRDY: Transmit Holding Register Ready (cleared by writing TWI_THR) TXRDY used in Master mode: 0: The transmit holding register has not been transferred into internal shifter. Set to 0 when writing into TWI_THR. 1: As soon as a data byte is transferred from TWI_THR to internal shifter or if a NACK error is detected, TXRDY is set at the same time as TXCOMP and NACK. TXRDY is also set when MSEN is set (enable TWI). TXRDY behavior in Master mode can be seen in Figure 34.7.3.4. TXRDY used in Slave mode: 0: As soon as data is written in the TWI_THR, until this data has been transmitted and acknowledged (ACK or NACK). 1: It indicates that the TWI_THR is empty and that data has been transmitted and acknowledged. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 753 If TXRDY is high and if a NACK has been detected, the transmission will be stopped. Thus when TRDY = NACK = 1, the programmer must not fill TWI_THR to avoid losing it. TXRDY behavior in Slave mode can be seen in Figure 34-24, Figure 34-27, Figure 34-29 and Figure 34-30. * SVREAD: Slave Read This bit is only used in Slave mode. When SVACC is low (no Slave access has been detected) SVREAD is irrelevant. 0: Indicates that a write access is performed by a Master. 1: Indicates that a read access is performed by a Master. SVREAD behavior can be seen in Figure 34-24, Figure 34-25, Figure 34-29 and Figure 34-30. * SVACC: Slave Access This bit is only used in Slave mode. 0: TWI is not addressed. SVACC is automatically cleared after a NACK or a STOP condition is detected. 1: Indicates that the address decoding sequence has matched (A Master has sent SADR). SVACC remains high until a NACK or a STOP condition is detected. SVACC behavior can be seen in Figure 34-24, Figure 34-25, Figure 34-29 and Figure 34-30. * GACC: General Call Access (cleared on read) This bit is only used in Slave mode. 0: No General Call has been detected. 1: A General Call has been detected. After the detection of General Call, if need be, the programmer may acknowledge this access and decode the following bytes and respond according to the value of the bytes. GACC behavior can be seen in Figure 34-26. * OVRE: Overrun Error (cleared on read) This bit is only used in Master mode. 0: TWI_RHR has not been loaded while RXRDY was set 1: TWI_RHR has been loaded while RXRDY was set. Reset by read in TWI_SR when TXCOMP is set. * NACK: Not Acknowledged (cleared on read) NACK used in Master mode: 0: Each data byte has been correctly received by the far-end side TWI slave component. 1: A data byte or an address byte has not been acknowledged by the slave component. Set at the same time as TXCOMP. NACK used in Slave Read mode: 0: Each data byte has been correctly received by the Master. 1: In Read mode, a data byte has not been acknowledged by the Master. When NACK is set, the programmer must not fill TWI_THR even if TXRDY is set, because that means that the Master will stop the data transfer or reinitiate it. Note that in Slave write mode all data are acknowledged by the TWI. 754 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * ARBLST: Arbitration Lost (cleared on read) This bit is only used in Master mode. 0: Arbitration won. 1: Arbitration lost. Another master of the TWI bus has won the multi-master arbitration. TXCOMP is set at the same time. * SCLWS: Clock Wait State This bit is only used in Slave mode. 0: The clock is not stretched. 1: The clock is stretched. TWI_THR / TWI_RHR buffer is not filled / emptied before transmission / reception of a new character. SCLWS behavior can be seen in Figure 34-27 and Figure 34-28. * EOSACC: End Of Slave Access (cleared on read) This bit is only used in Slave mode. 0: A slave access is being performed. 1: The Slave access is finished. End Of Slave Access is automatically set as soon as SVACC is reset. EOSACC behavior can be seen in Figure 34-29 and Figure 34-30. * ENDRX: End of RX buffer (cleared by writing TWI_RCR or TWI_RNCR) 0: The Receive Counter Register has not reached 0 since the last write in TWI_RCR or TWI_RNCR. 1: The Receive Counter Register has reached 0 since the last write in TWI_RCR or TWI_RNCR. * ENDTX: End of TX buffer (cleared by writing TWI_TCR or TWI_TNCR) 0: The Transmit Counter Register has not reached 0 since the last write in TWI_TCR or TWI_TNCR. 1: The Transmit Counter Register has reached 0 since the last write in TWI_TCR or TWI_TNCR. * RXBUFF: RX Buffer Full (cleared by writing TWI_RCR or TWI_RNCR) 0: TWI_RCR or TWI_RNCR have a value other than 0. 1: Both TWI_RCR and TWI_RNCR have a value of 0. * TXBUFE: TX Buffer Empty (cleared by writing TWI_TCR or TWI_TNCR) 0: TWI_TCR or TWI_TNCR have a value other than 0. 1: Both TWI_TCR and TWI_TNCR have a value of 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 755 34.8.7 TWI Interrupt Enable Register Name: TWI_IER Address: 0x40018024 (0), 0x4001C024 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 TXBUFE 14 RXBUFF 13 ENDTX 12 ENDRX 11 EOSACC 10 SCL_WS 9 ARBLST 8 NACK 7 - 6 OVRE 5 GACC 4 SVACC 3 - 2 TXRDY 1 RXRDY 0 TXCOMP The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Enables the corresponding interrupt. * TXCOMP: Transmission Completed Interrupt Enable * RXRDY: Receive Holding Register Ready Interrupt Enable * TXRDY: Transmit Holding Register Ready Interrupt Enable * SVACC: Slave Access Interrupt Enable * GACC: General Call Access Interrupt Enable * OVRE: Overrun Error Interrupt Enable * NACK: Not Acknowledge Interrupt Enable * ARBLST: Arbitration Lost Interrupt Enable * SCL_WS: Clock Wait State Interrupt Enable * EOSACC: End Of Slave Access Interrupt Enable * ENDRX: End of Receive Buffer Interrupt Enable * ENDTX: End of Transmit Buffer Interrupt Enable * RXBUFF: Receive Buffer Full Interrupt Enable * TXBUFE: Transmit Buffer Empty Interrupt Enable 756 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 34.8.8 TWI Interrupt Disable Register Name: TWI_IDR Address: 0x40018028 (0), 0x4001C028 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 TXBUFE 14 RXBUFF 13 ENDTX 12 ENDRX 11 EOSACC 10 SCL_WS 9 ARBLST 8 NACK 7 - 6 OVRE 5 GACC 4 SVACC 3 - 2 TXRDY 1 RXRDY 0 TXCOMP The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Disables the corresponding interrupt. * TXCOMP: Transmission Completed Interrupt Disable * RXRDY: Receive Holding Register Ready Interrupt Disable * TXRDY: Transmit Holding Register Ready Interrupt Disable * SVACC: Slave Access Interrupt Disable * GACC: General Call Access Interrupt Disable * OVRE: Overrun Error Interrupt Disable * NACK: Not Acknowledge Interrupt Disable * ARBLST: Arbitration Lost Interrupt Disable * SCL_WS: Clock Wait State Interrupt Disable * EOSACC: End Of Slave Access Interrupt Disable * ENDRX: End of Receive Buffer Interrupt Disable * ENDTX: End of Transmit Buffer Interrupt Disable * RXBUFF: Receive Buffer Full Interrupt Disable * TXBUFE: Transmit Buffer Empty Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 757 34.8.9 TWI Interrupt Mask Register Name: TWI_IMR Address: 0x4001802C (0), 0x4001C02C (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 TXBUFE 14 RXBUFF 13 ENDTX 12 ENDRX 11 EOSACC 10 SCL_WS 9 ARBLST 8 NACK 7 - 6 OVRE 5 GACC 4 SVACC 3 - 2 TXRDY 1 RXRDY 0 TXCOMP The following configuration values are valid for all listed bit names of this register: 0: The corresponding interrupt is disabled. 1: The corresponding interrupt is enabled. * TXCOMP: Transmission Completed Interrupt Mask * RXRDY: Receive Holding Register Ready Interrupt Mask * TXRDY: Transmit Holding Register Ready Interrupt Mask * SVACC: Slave Access Interrupt Mask * GACC: General Call Access Interrupt Mask * OVRE: Overrun Error Interrupt Mask * NACK: Not Acknowledge Interrupt Mask * ARBLST: Arbitration Lost Interrupt Mask * SCL_WS: Clock Wait State Interrupt Mask * EOSACC: End Of Slave Access Interrupt Mask * ENDRX: End of Receive Buffer Interrupt Mask * ENDTX: End of Transmit Buffer Interrupt Mask * RXBUFF: Receive Buffer Full Interrupt Mask * TXBUFE: Transmit Buffer Empty Interrupt Mask 758 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 34.8.10 TWI Receive Holding Register Name: TWI_RHR Address: 0x40018030 (0), 0x4001C030 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 6 5 4 3 2 1 0 RXDATA * RXDATA: Master or Slave Receive Holding Data SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 759 34.8.11 TWI Transmit Holding Register Name: TWI_THR Address: 0x40018034 (0), 0x4001C034 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 6 5 4 3 2 1 0 TXDATA * TXDATA: Master or Slave Transmit Holding Data 760 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 35. Universal Asynchronous Receiver Transmitter (UART) 35.1 Description The Universal Asynchronous Receiver Transmitter (UART) features a two-pin UART that can be used for communication and trace purposes and offers an ideal medium for in-situ programming solutions. Moreover, the association with a peripheral DMA controller (PDC) permits packet handling for these tasks with processor time reduced to a minimum. 35.2 Embedded Characteristics 35.3 Two-pin UART Independent Receiver and Transmitter with a Common Programmable Baud Rate Generator Even, Odd, Mark or Space Parity Generation Parity, Framing and Overrun Error Detection Automatic Echo, Local Loopback and Remote Loopback Channel Modes Interrupt Generation Support for Two PDC Channels with Connection to Receiver and Transmitter Block Diagram Figure 35-1. UART Block Diagram UART UTXD Peripheral DMA Controller Transmit Parallel Input/ Output Baud Rate Generator Receive bus clock URXD Bridge APB Interrupt Control PMC Table 35-1. uart_irq peripheral clock UART Pin Description Pin Name Description Type URXD UART Receive Data Input UTXD UART Transmit Data Output SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 761 35.4 Product Dependencies 35.4.1 I/O Lines The UART pins are multiplexed with PIO lines. The user must first configure the corresponding PIO Controller to enable I/O line operations of the UART. Table 35-2. I/O Lines Instance Signal I/O Line Peripheral UART0 URXD0 PA9 A UART0 UTXD0 PA10 A UART1 URXD1 PB2 A UART1 UTXD1 PB3 A 35.4.2 Power Management The UART clock can be controlled through the Power Management Controller (PMC). In this case, the user must first configure the PMC to enable the UART clock. Usually, the peripheral identifier used for this purpose is 1. 35.4.3 Interrupt Sources The UART interrupt line is connected to one of the interrupt sources of the Interrupt Controller. Interrupt handling requires programming of the Interrupt Controller before configuring the UART. Table 35-3. 35.5 Peripheral IDs Instance ID UART0 8 UART1 9 Functional Description The UART operates in Asynchronous mode only and supports only 8-bit character handling (with parity). It has no clock pin. The UART is made up of a receiver and a transmitter that operate independently, and a common baud rate generator. Receiver timeout and transmitter time guard are not implemented. However, all the implemented features are compatible with those of a standard USART. 35.5.1 Baud Rate Generator The baud rate generator provides the bit period clock named baud rate clock to both the receiver and the transmitter. The baud rate clock is the peripheral clock divided by 16 times the clock divisor (CD) value written in the Baud Rate Generator register (UART_BRGR). If UART_BRGR is set to 0, the baud rate clock is disabled and the UART remains inactive. The maximum allowable baud rate is peripheral clock divided by 16. The minimum allowable baud rate is peripheral clock divided by (16 x 65536). 762 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 35-2. Baud Rate Generator CD CD 16-bit Counter peripheral clock OUT >1 Divide by 16 1 0 Baud Rate Clock 0 Receiver Sampling Clock 35.5.2 Receiver 35.5.2.1 Receiver Reset, Enable and Disable After device reset, the UART receiver is disabled and must be enabled before being used. The receiver can be enabled by writing the Control Register (UART_CR) with the bit RXEN at 1. At this command, the receiver starts looking for a start bit. The programmer can disable the receiver by writing UART_CR with the bit RXDIS at 1. If the receiver is waiting for a start bit, it is immediately stopped. However, if the receiver has already detected a start bit and is receiving the data, it waits for the stop bit before actually stopping its operation. The receiver can be put in reset state by writing UART_CR with the bit RSTRX at 1. In this case, the receiver immediately stops its current operations and is disabled, whatever its current state. If RSTRX is applied when data is being processed, this data is lost. 35.5.2.2 Start Detection and Data Sampling The UART only supports asynchronous operations, and this affects only its receiver. The UART receiver detects the start of a received character by sampling the URXD signal until it detects a valid start bit. A low level (space) on URXD is interpreted as a valid start bit if it is detected for more than seven cycles of the sampling clock, which is 16 times the baud rate. Hence, a space that is longer than 7/16 of the bit period is detected as a valid start bit. A space which is 7/16 of a bit period or shorter is ignored and the receiver continues to wait for a valid start bit. When a valid start bit has been detected, the receiver samples the URXD at the theoretical midpoint of each bit. It is assumed that each bit lasts 16 cycles of the sampling clock (1-bit period) so the bit sampling point is eight cycles (0.5-bit period) after the start of the bit. The first sampling point is therefore 24 cycles (1.5-bit periods) after detecting the falling edge of the start bit. Each subsequent bit is sampled 16 cycles (1-bit period) after the previous one. Figure 35-3. Start Bit Detection URXD S D0 D1 D2 D3 D4 D5 D6 D7 P stop S D0 D1 D2 D3 D4 D5 D6 D7 P stop RXRDY OVRE RSTSTA SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 763 Figure 35-4. Character Reception Example: 8-bit, parity enabled 1 stop 0.5 bit period 1 bit period URXD Sampling 35.5.2.3 D0 D1 True Start Detection D2 D3 D4 D5 D6 Stop Bit D7 Parity Bit Receiver Ready When a complete character is received, it is transferred to the Receive Holding Register (UART_RHR) and the RXRDY status bit in the Status Register (UART_SR) is set. The bit RXRDY is automatically cleared when UART_RHR is read. Figure 35-5. Receiver Ready S URXD D0 D1 D2 D3 D4 D5 D6 D7 S P D0 D1 D2 D3 D4 D5 D6 D7 P RXRDY Read UART_RHR 35.5.2.4 Receiver Overrun The OVRE status bit in UART_SR is set if UART_RHR has not been read by the software (or the PDC) since the last transfer, the RXRDY bit is still set and a new character is received. OVRE is cleared when the software writes a 1 to the bit RSTSTA (Reset Status) in UART_CR. Figure 35-6. URXD Receiver Overrun S D0 D1 D2 D3 D4 D5 D6 D7 P stop S D0 D1 D2 D3 D4 D5 D6 D7 P stop RXRDY OVRE RSTSTA 35.5.2.5 Parity Error Each time a character is received, the receiver calculates the parity of the received data bits, in accordance with the field PAR in the Mode Register (UART_MR). It then compares the result with the received parity bit. If different, the parity error bit PARE in UART_SR is set at the same time RXRDY is set. The parity bit is cleared when UART_CR is written with the bit RSTSTA (Reset Status) at 1. If a new character is received before the reset status command is written, the PARE bit remains at 1. 764 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 35-7. Parity Error S URXD D0 D1 D2 D3 D4 D5 D6 D7 P stop RXRDY PARE Wrong Parity Bit 35.5.2.6 RSTSTA Receiver Framing Error When a start bit is detected, it generates a character reception when all the data bits have been sampled. The stop bit is also sampled and when it is detected at 0, the FRAME (Framing Error) bit in UART_SR is set at the same time the RXRDY bit is set. The FRAME bit remains high until the Control Register (UART_CR) is written with the bit RSTSTA at 1. Figure 35-8. Receiver Framing Error URXD S D0 D1 D2 D3 D4 D5 D6 D7 P stop RXRDY FRAME Stop Bit Detected at 0 RSTSTA 35.5.3 Transmitter 35.5.3.1 Transmitter Reset, Enable and Disable After device reset, the UART transmitter is disabled and must be enabled before being used. The transmitter is enabled by writing UART_CR with the bit TXEN at 1. From this command, the transmitter waits for a character to be written in the Transmit Holding Register (UART_THR) before actually starting the transmission. The programmer can disable the transmitter by writing UART_CR with the bit TXDIS at 1. If the transmitter is not operating, it is immediately stopped. However, if a character is being processed into the internal shift register and/or a character has been written in the UART_THR, the characters are completed before the transmitter is actually stopped. The programmer can also put the transmitter in its reset state by writing the UART_CR with the bit RSTTX at 1. This immediately stops the transmitter, whether or not it is processing characters. 35.5.3.2 Transmit Format The UART transmitter drives the pin UTXD at the baud rate clock speed. The line is driven depending on the format defined in UART_MR and the data stored in the internal shift register. One start bit at level 0, then the 8 data bits, from the lowest to the highest bit, one optional parity bit and one stop bit at 1 are consecutively shifted out as shown in the following figure. The field PARE in UART_MR defines whether or not a parity bit is shifted out. When a parity bit is enabled, it can be selected between an odd parity, an even parity, or a fixed space or mark bit. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 765 Figure 35-9. Character Transmission Example: Parity enabled Baud Rate Clock UTXD Start Bit 35.5.3.3 D0 D1 D2 D3 D4 D5 D6 D7 Parity Bit Stop Bit Transmitter Control When the transmitter is enabled, the bit TXRDY (Transmitter Ready) is set in UART_SR. The transmission starts when the programmer writes in the UART_THR, and after the written character is transferred from UART_THR to the internal shift register. The TXRDY bit remains high until a second character is written in UART_THR. As soon as the first character is completed, the last character written in UART_THR is transferred into the internal shift register and TXRDY rises again, showing that the holding register is empty. When both the internal shift register and UART_THR are empty, i.e., all the characters written in UART_THR have been processed, the TXEMPTY bit rises after the last stop bit has been completed. Figure 35-10. Transmitter Control UART_THR Data 0 Data 1 Shift Register UTXD Data 0 S Data 0 Data 1 P stop S Data 1 P stop TXRDY TXEMPTY Write Data 0 in UART_THR Write Data 1 in UART_THR 35.5.4 Peripheral DMA Controller (PDC) Both the receiver and the transmitter of the UART are connected to a PDC. The PDC channels are programmed via registers that are mapped within the UART user interface from the offset 0x100. The status bits are reported in UART_SR and generate an interrupt. The RXRDY bit triggers the PDC channel data transfer of the receiver. This results in a read of the data in UART_RHR. The TXRDY bit triggers the PDC channel data transfer of the transmitter. This results in a write of data in UART_THR. 35.5.5 Test Modes The UART supports three test modes. These modes of operation are programmed by using the CHMODE field in UART_MR. The Automatic echo mode allows a bit-by-bit retransmission. When a bit is received on the URXD line, it is sent to the UTXD line. The transmitter operates normally, but has no effect on the UTXD line. 766 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The Local loopback mode allows the transmitted characters to be received. UTXD and URXD pins are not used and the output of the transmitter is internally connected to the input of the receiver. The URXD pin level has no effect and the UTXD line is held high, as in idle state. The Remote loopback mode directly connects the URXD pin to the UTXD line. The transmitter and the receiver are disabled and have no effect. This mode allows a bit-by-bit retransmission. Figure 35-11. Test Modes Automatic Echo RXD Receiver Transmitter Disabled TXD Local Loopback Disabled Receiver RXD VDD Disabled Transmitter Remote Loopback TXD VDD Disabled RXD Receiver Disabled Transmitter TXD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 767 35.6 Universal Asynchronous Receiver Transmitter (UART) User Interface Table 35-4. Register Mapping Access Reset UART_CR Write-only - Mode Register UART_MR Read/Write 0x0 0x0008 Interrupt Enable Register UART_IER Write-only - 0x000C Interrupt Disable Register UART_IDR Write-only - 0x0010 Interrupt Mask Register UART_IMR Read-only 0x0 0x0014 Status Register UART_SR Read-only - 0x0018 Receive Holding Register UART_RHR Read-only 0x0 0x001C Transmit Holding Register UART_THR Write-only - 0x0020 Baud Rate Generator Register UART_BRGR Read/Write 0x0 0x0024 Reserved - - - 0x0028-0x003C Reserved - - - 0x0040-0x00E8 Reserved - - - 0x00EC-0x00FC Reserved - - - 0x0100-0x0128 Reserved for PDC registers - - - 768 Offset Register Name 0x0000 Control Register 0x0004 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 35.6.1 UART Control Register Name: UART_CR Address: 0x400E0600 (0), 0x400E0800 (1) Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - RSTSTA 7 6 5 4 3 2 1 0 TXDIS TXEN RXDIS RXEN RSTTX RSTRX - - * RSTRX: Reset Receiver 0: No effect. 1: The receiver logic is reset and disabled. If a character is being received, the reception is aborted. * RSTTX: Reset Transmitter 0: No effect. 1: The transmitter logic is reset and disabled. If a character is being transmitted, the transmission is aborted. * RXEN: Receiver Enable 0: No effect. 1: The receiver is enabled if RXDIS is 0. * RXDIS: Receiver Disable 0: No effect. 1: The receiver is disabled. If a character is being processed and RSTRX is not set, the character is completed before the receiver is stopped. * TXEN: Transmitter Enable 0: No effect. 1: The transmitter is enabled if TXDIS is 0. * TXDIS: Transmitter Disable 0: No effect. 1: The transmitter is disabled. If a character is being processed and a character has been written in the UART_THR and RSTTX is not set, both characters are completed before the transmitter is stopped. * RSTSTA: Reset Status 0: No effect. 1: Resets the status bits PARE, FRAME and OVRE in the UART_SR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 769 35.6.2 UART Mode Register Name: UART_MR Address: 0x400E0604 (0), 0x400E0804 (1) Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - CHMODE 7 6 5 4 3 2 1 0 - - - - - - - - * PAR: Parity Type Value Name Description 0 EVEN Even Parity 1 ODD Odd Parity 2 SPACE Space: parity forced to 0 3 MARK Mark: parity forced to 1 4 NO No parity * CHMODE: Channel Mode Value 770 - PAR Name Description 0 NORMAL Normal mode 1 AUTOMATIC Automatic echo 2 LOCAL_LOOPBACK Local loopback 3 REMOTE_LOOPBACK Remote loopback SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 35.6.3 UART Interrupt Enable Register Name: UART_IER Address: 0x400E0608 (0), 0x400E0808 (1) Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - RXBUFF TXBUFE - TXEMPTY - 7 6 5 4 3 2 1 0 PARE FRAME OVRE ENDTX ENDRX - TXRDY RXRDY The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Enables the corresponding interrupt. * RXRDY: Enable RXRDY Interrupt * TXRDY: Enable TXRDY Interrupt * ENDRX: Enable End of Receive Transfer Interrupt * ENDTX: Enable End of Transmit Interrupt * OVRE: Enable Overrun Error Interrupt * FRAME: Enable Framing Error Interrupt * PARE: Enable Parity Error Interrupt * TXEMPTY: Enable TXEMPTY Interrupt * TXBUFE: Enable Buffer Empty Interrupt * RXBUFF: Enable Buffer Full Interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 771 35.6.4 UART Interrupt Disable Register Name: UART_IDR Address: 0x400E060C (0), 0x400E080C (1) Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - RXBUFF TXBUFE - TXEMPTY - 7 6 5 4 3 2 1 0 PARE FRAME OVRE ENDTX ENDRX - TXRDY RXRDY The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Disables the corresponding interrupt. * RXRDY: Disable RXRDY Interrupt * TXRDY: Disable TXRDY Interrupt * ENDRX: Disable End of Receive Transfer Interrupt * ENDTX: Disable End of Transmit Interrupt * OVRE: Disable Overrun Error Interrupt * FRAME: Disable Framing Error Interrupt * PARE: Disable Parity Error Interrupt * TXEMPTY: Disable TXEMPTY Interrupt * TXBUFE: Disable Buffer Empty Interrupt * RXBUFF: Disable Buffer Full Interrupt 772 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 35.6.5 UART Interrupt Mask Register Name: UART_IMR Address: 0x400E0610 (0), 0x400E0810 (1) Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - RXBUFF TXBUFE - TXEMPTY - 7 6 5 4 3 2 1 0 PARE FRAME OVRE ENDTX ENDRX - TXRDY RXRDY The following configuration values are valid for all listed bit names of this register: 0: The corresponding interrupt is disabled. 1: The corresponding interrupt is enabled. * RXRDY: Mask RXRDY Interrupt * TXRDY: Disable TXRDY Interrupt * ENDRX: Mask End of Receive Transfer Interrupt * ENDTX: Mask End of Transmit Interrupt * OVRE: Mask Overrun Error Interrupt * FRAME: Mask Framing Error Interrupt * PARE: Mask Parity Error Interrupt * TXEMPTY: Mask TXEMPTY Interrupt * TXBUFE: Mask TXBUFE Interrupt * RXBUFF: Mask RXBUFF Interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 773 35.6.6 UART Status Register Name: UART_SR Address: 0x400E0614 (0), 0x400E0814 (1) Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - RXBUFF TXBUFE - TXEMPTY - 7 6 5 4 3 2 1 0 PARE FRAME OVRE ENDTX ENDRX - TXRDY RXRDY * RXRDY: Receiver Ready 0: No character has been received since the last read of the UART_RHR, or the receiver is disabled. 1: At least one complete character has been received, transferred to UART_RHR and not yet read. * TXRDY: Transmitter Ready 0: A character has been written to UART_THR and not yet transferred to the internal shift register, or the transmitter is disabled. 1: There is no character written to UART_THR not yet transferred to the internal shift register. * ENDRX: End of Receiver Transfer 0: The end of transfer signal from the receiver PDC channel is inactive. 1: The end of transfer signal from the receiver PDC channel is active. * ENDTX: End of Transmitter Transfer 0: The end of transfer signal from the transmitter PDC channel is inactive. 1: The end of transfer signal from the transmitter PDC channel is active. * OVRE: Overrun Error 0: No overrun error has occurred since the last RSTSTA. 1: At least one overrun error has occurred since the last RSTSTA. * FRAME: Framing Error 0: No framing error has occurred since the last RSTSTA. 1: At least one framing error has occurred since the last RSTSTA. * PARE: Parity Error 0: No parity error has occurred since the last RSTSTA. 1: At least one parity error has occurred since the last RSTSTA. * TXEMPTY: Transmitter Empty 0: There are characters in UART_THR, or characters being processed by the transmitter, or the transmitter is disabled. 1: There are no characters in UART_THR and there are no characters being processed by the transmitter. 774 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * TXBUFE: Transmission Buffer Empty 0: The buffer empty signal from the transmitter PDC channel is inactive. 1: The buffer empty signal from the transmitter PDC channel is active. * RXBUFF: Receive Buffer Full 0: The buffer full signal from the receiver PDC channel is inactive. 1: The buffer full signal from the receiver PDC channel is active. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 775 35.6.7 UART Receiver Holding Register Name: UART_RHR Address: 0x400E0618 (0), 0x400E0818 (1) Access: Read-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 RXCHR * RXCHR: Received Character Last received character if RXRDY is set. 776 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 35.6.8 UART Transmit Holding Register Name: UART_THR Address: 0x400E061C (0), 0x400E081C (1) Access: Write-only 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 - - - - - - - - 7 6 5 4 3 2 1 0 TXCHR * TXCHR: Character to be Transmitted Next character to be transmitted after the current character if TXRDY is not set. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 777 35.6.9 UART Baud Rate Generator Register Name: UART_BRGR Address: 0x400E0620 (0), 0x400E0820 (1) Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 22 21 20 19 18 17 16 - - - - - - - - 15 14 13 12 11 10 9 8 3 2 1 0 CD 7 6 5 4 CD * CD: Clock Divisor 0: Baud rate clock is disabled 1 to 65,535: f peripheral clock CD = ---------------------------------16 x Baud Rate 778 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36. Universal Synchronous Asynchronous Receiver Transceiver (USART) 36.1 Description The Universal Synchronous Asynchronous Receiver Transceiver (USART) provides one full duplex universal synchronous asynchronous serial link. Data frame format is widely programmable (data length, parity, number of stop bits) to support a maximum of standards. The receiver implements parity error, framing error and overrun error detection. The receiver time-out enables handling variable-length frames and the transmitter timeguard facilitates communications with slow remote devices. Multidrop communications are also supported through address bit handling in reception and transmission. The USART features three test modes: Remote loopback, Local loopback and Automatic echo. The USART supports specific operating modes providing interfaces on RS485, and SPI buses, with ISO7816 T = 0 or T = 1 smart card slots, infrared transceivers and connection to modem ports. The hardware handshaking feature enables an out-of-band flow control by automatic management of the pins RTS and CTS. The USART supports the connection to the Peripheral DMA Controller, which enables data transfers to the transmitter and from the receiver. The PDC provides chained buffer management without any intervention of the processor. 36.2 Embedded Characteristics Programmable Baud Rate Generator 5- to 9-bit Full-duplex Synchronous or Asynchronous Serial Communications 1, 1.5 or 2 Stop Bits in Asynchronous Mode or 1 or 2 Stop Bits in Synchronous Mode Parity Generation and Error Detection Framing Error Detection, Overrun Error Detection Digital Filter on Receive Line MSB- or LSB-first Optional Break Generation and Detection By 8 or by 16 Over-sampling Receiver Frequency Optional Hardware Handshaking RTS-CTS Optional Modem Signal Management DTR-DSR-DCD-RI Receiver Time-out and Transmitter Timeguard Optional Multidrop Mode with Address Generation and Detection RS485 with Driver Control Signal ISO7816, T = 0 or T = 1 Protocols for Interfacing with Smart Cards NACK Handling, Error Counter with Repetition and Iteration Limit IrDA Modulation and Demodulation Communication at up to 115.2 kbit/s SPI Mode Master or Slave Serial Clock Programmable Phase and Polarity SPI Serial Clock (SCK) Frequency up to fperipheral clock/6 Test Modes Remote Loopback, Local Loopback, Automatic Echo Supports Connection of: Two Peripheral DMA Controller Channels (PDC) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 779 780 Offers Buffer Transfer without Processor Intervention Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.3 Block Diagram Figure 36-1. USART Block Diagram Interrupt Controller USART Interrupt PIO Controller USART RXD Receiver Channel RTS (Peripheral) DMA Controller TXD Channel Transmitter CTS DTR Modem Signals Control Bus clock DSR DCD Bridge APB Peripheral clock PMC 36.4 RI User Interface SCK Baud Rate Generator Peripheral clock/DIV I/O Lines Description Table 36-1. I/O Line Description Name Description Type Active Level SCK Serial Clock I/O -- I/O -- Input -- Ring Indicator Input Low DSR Data Set Ready Input Low DCD Data Carrier Detect Input Low DTR Data Terminal Ready Output Low Input Low Output Low Transmit Serial Data TXD or Master Out Slave In (MOSI) in SPI master mode or Master In Slave Out (MISO) in SPI slave mode Receive Serial Data RXD or Master In Slave Out (MISO) in SPI master mode or Master Out Slave In (MOSI) in SPI slave mode RI CTS RTS Clear to Send or Slave Select (NSS) in SPI slave mode Request to Send or Slave Select (NSS) in SPI master mode SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 781 36.5 Product Dependencies 36.5.1 I/O Lines The pins used for interfacing the USART may be multiplexed with the PIO lines. The programmer must first program the PIO controller to assign the desired USART pins to their peripheral function. If I/O lines of the USART are not used by the application, they can be used for other purposes by the PIO Controller. To prevent the TXD line from falling when the USART is disabled, the use of an internal pull up is mandatory. If the hardware handshaking feature or Modem mode is used, the internal pull up on TXD must also be enabled. All the pins of the modems may or may not be implemented on the USART. Only USART1 fully equipped with all the modem signals. On USARTs not equipped with the corresponding pin, the associated control bits and statuses have no effect on the behavior of the USART. Table 36-2. I/O Lines Instance Signal I/O Line Peripheral USART0 CTS0 PA8 A USART0 RTS0 PA7 A USART0 RXD0 PA5 A USART0 SCK0 PA2 B USART0 TXD0 PA6 A USART1 CTS1 PA25 A USART1 DCD1 PA26 A USART1 DSR1 PA28 A USART1 DTR1 PA27 A USART1 RI1 PA29 A USART1 RTS1 PA24 A USART1 RXD1 PA21 A USART1 SCK1 PA23 A USART1 TXD1 PA22 A 36.5.2 Power Management The USART is not continuously clocked. The programmer must first enable the USART clock in the Power Management Controller (PMC) before using the USART. However, if the application does not require USART operations, the USART clock can be stopped when not needed and be restarted later. In this case, the USART will resume its operations where it left off. 36.5.3 Interrupt Sources The USART interrupt line is connected on one of the internal sources of the Interrupt Controller. Using the USART interrupt requires the Interrupt Controller to be programmed first. Table 36-3. 782 Peripheral IDs Instance ID USART0 14 USART1 15 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.6 Functional Description 36.6.1 Baud Rate Generator The baud rate generator provides the bit period clock, also named the baud rate clock, to both the receiver and the transmitter. The baud rate generator clock source is selected by configuring the USCLKS field in the USART Mode Register (US_MR) to one of the following: The peripheral clock A division of the peripheral clock, where the divider is product-dependent, but generally set to 8 The external clock, available on the SCK pin The baud rate generator is based upon a 16-bit divider, which is programmed with the CD field of the Baud Rate Generator register (US_BRGR). If a 0 is written to CD, the baud rate generator does not generate any clock. If a 1 is written to CD, the divider is bypassed and becomes inactive. If the external SCK clock is selected, the duration of the low and high levels of the signal provided on the SCK pin must be longer than a peripheral clock period. The frequency of the signal provided on SCK must be at least 3 times lower than the frequency provided on the peripheral clock in USART mode (field USART_MODE differs from 0xE or 0xF), or 6 times lower in SPI mode (field USART_MODE equals 0xE or 0xF). Figure 36-2. Baud Rate Generator USCLKS Peripheral clock Peripheral clock/DIV Reserved SCK CD SCK (CLKO = 1) CD 0 1 2 16-bit Counter FIDI >1 3 1 (CLKO = 0) 0 0 0 SYNC OVER Sampling Divider 0 Baud Rate Clock 1 1 SYNC USCLKS = 3 36.6.1.1 Sampling Clock Baud Rate in Asynchronous Mode If the USART is programmed to operate in Asynchronous mode, the selected clock is first divided by CD, which is field programmed in the US_BRGR. The resulting clock is provided to the receiver as a sampling clock and then divided by 16 or 8, depending on how the OVER bit in the US_MR is programmed. If OVER is set, the receiver sampling is eight times higher than the baud rate clock. If OVER is cleared, the sampling is performed at 16 times the baud rate clock. The baud rate is calculated as per the following formula: SelectedClock Baudrate = -------------------------------------------( 8 ( 2 - Over )CD ) This gives a maximum baud rate of peripheral clock divided by 8, assuming that the peripheral clock is the highest possible clock and that the OVER bit is set. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 783 Baud Rate Calculation Example Table 36-4 shows calculations of CD to obtain a baud rate at 38,400 bit/s for different source clock frequencies. This table also shows the actual resulting baud rate and the error. Table 36-4. Baud Rate Example (OVER = 0) Source Clock (MHz) Expected Baud Rate (bit/s) Calculation Result CD Actual Baud Rate (bit/s) Error 3,686,400 38,400 6.00 6 38,400.00 0.00% 4,915,200 38,400 8.00 8 38,400.00 0.00% 5,000,000 38,400 8.14 8 39,062.50 1.70% 7,372,800 38,400 12.00 12 38,400.00 0.00% 8,000,000 38,400 13.02 13 38,461.54 0.16% 12,000,000 38,400 19.53 20 37,500.00 2.40% 12,288,000 38,400 20.00 20 38,400.00 0.00% 14,318,180 38,400 23.30 23 38,908.10 1.31% 14,745,600 38,400 24.00 24 38,400.00 0.00% 18,432,000 38,400 30.00 30 38,400.00 0.00% 24,000,000 38,400 39.06 39 38,461.54 0.16% 24,576,000 38,400 40.00 40 38,400.00 0.00% 25,000,000 38,400 40.69 40 38,109.76 0.76% 32,000,000 38,400 52.08 52 38,461.54 0.16% 32,768,000 38,400 53.33 53 38,641.51 0.63% 33,000,000 38,400 53.71 54 38,194.44 0.54% 40,000,000 38,400 65.10 65 38,461.54 0.16% 50,000,000 38,400 81.38 81 38,580.25 0.47% The baud rate is calculated with the following formula: BaudRate = f peripheral clock CD x 16 The baud rate error is calculated with the following formula. It is not recommended to work with an error higher than 5%. ExpectedBaudRate Error = 1 - --------------------------------------------------- ActualBaudRate 36.6.1.2 Fractional Baud Rate in Asynchronous Mode The baud rate generator is subject to the following limitation: the output frequency changes only by integer multiples of the reference frequency. An approach to this problem is to integrate a fractional N clock generator that has a high resolution. The generator architecture is modified to obtain baud rate changes by a fraction of the reference source clock. This fractional part is programmed with the FP field in the US_BRGR. If FP is not 0, the 784 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 fractional part is activated. The resolution is one eighth of the clock divider. This feature is only available when using USART normal mode. The fractional baud rate is calculated using the following formula: SelectedClock Baudrate = --------------------------------------------------------------- 8 ( 2 - Over ) CD + FP ------- 8 The modified architecture is presented in the following Figure 36-3. Figure 36-3. Fractional Baud Rate Generator FP USCLKS CD Modulus Control FP MCK MCK/DIV Reserved SCK (CLKO = 1) CD 0 1 2 3 16-bit Counter Glitch-free Logic 1 SCK (CLKO = 0) 0 FIDI >1 0 0 SYNC OVER Sampling Divider 0 Baud Rate Clock 1 1 SYNC USCLKS = 3 36.6.1.3 Sampling Clock Baud Rate in Synchronous Mode or SPI Mode If the USART is programmed to operate in Synchronous mode, the selected clock is simply divided by the field CD in the US_BRGR. SelectedClock BaudRate = -------------------------------------CD In Synchronous mode, if the external clock is selected (USCLKS = 3), the clock is provided directly by the signal on the USART SCK pin. No division is active. The value written in US_BRGR has no effect. The external clock frequency must be at least 3 times lower than the system clock. In Synchronous mode master (USCLKS = 0 or 1, CLKO set to 1), the receive part limits the SCK maximum frequency tofperipheral clock/3 in USART mode, or fperipheral clock/6 in SPI mode. When either the external clock SCK or the internal clock divided (peripheral clock/DIV) is selected, the value programmed in CD must be even if the user has to ensure a 50:50 mark/space ratio on the SCK pin. When the peripheral clock is selected, the baud rate generator ensures a 50:50 duty cycle on the SCK pin, even if the value programmed in CD is odd. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 785 36.6.1.4 Baud Rate in ISO 7816 Mode The ISO7816 specification defines the bit rate with the following formula: Di B = ------ x f Fi where: B is the bit rate Di is the bit-rate adjustment factor Fi is the clock frequency division factor f is the ISO7816 clock frequency (Hz) Di is a binary value encoded on a 4-bit field, named DI, as represented in Table 36-5. Table 36-5. Binary and Decimal Values for Di DI field 0001 0010 0011 0100 0101 0110 1000 1001 1 2 4 8 16 32 12 20 Di (decimal) Fi is a binary value encoded on a 4-bit field, named FI, as represented in Table 36-6. Table 36-6. Binary and Decimal Values for Fi FI field 0000 0001 0010 0011 0100 0101 0110 1001 1010 1011 1100 1101 Fi (decimal) 372 372 558 744 1116 1488 1860 512 768 1024 1536 2048 Table 36-7 shows the resulting Fi/Di ratio, which is the ratio between the ISO7816 clock and the baud rate clock. Table 36-7. Possible Values for the Fi/Di Ratio Fi/Di 372 558 744 1116 1488 1806 512 768 1024 1536 2048 1 372 558 744 1116 1488 1860 512 768 1024 1536 2048 2 186 279 372 558 744 930 256 384 512 768 1024 4 93 139.5 186 279 372 465 128 192 256 384 512 8 46.5 69.75 93 139.5 186 232.5 64 96 128 192 256 16 23.25 34.87 46.5 69.75 93 116.2 32 48 64 96 128 32 11.62 17.43 23.25 34.87 46.5 58.13 16 24 32 48 64 12 31 46.5 62 93 124 155 42.66 64 85.33 128 170.6 20 18.6 27.9 37.2 55.8 74.4 93 25.6 38.4 51.2 76.8 102.4 If the USART is configured in ISO7816 mode, the clock selected by the USCLKS field in US_MR is first divided by the value programmed in the field CD in the US_BRGR. The resulting clock can be provided to the SCK pin to feed the smart card clock inputs. This means that the CLKO bit can be set in US_MR. This clock is then divided by the value programmed in the FI_DI_RATIO field in the FI_DI_Ratio register (US_FIDI). This is performed by the Sampling Divider, which performs a division by up to 2047 in ISO7816 mode. The non-integer values of the Fi/Di Ratio are not supported and the user must program the FI_DI_RATIO field to a value as close as possible to the expected value. The FI_DI_RATIO field resets to the value 0x174 (372 in decimal) and is the most common divider between the ISO7816 clock and the bit rate (Fi = 372, Di = 1). Figure 36-4 shows the relation between the Elementary Time Unit, corresponding to a bit time, and the ISO 7816 clock. 786 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 36-4. Elementary Time Unit (ETU) FI_DI_RATIO ISO7816 Clock Cycles ISO7816 Clock on SCK ISO7816 I/O Line on TXD 1 ETU 36.6.2 Receiver and Transmitter Control After reset, the receiver is disabled. The user must enable the receiver by setting the RXEN bit in the Control register (US_CR). However, the receiver registers can be programmed before the receiver clock is enabled. After reset, the transmitter is disabled. The user must enable it by setting the TXEN bit in the US_CR. However, the transmitter registers can be programmed before being enabled. The receiver and the transmitter can be enabled together or independently. At any time, the software can perform a reset on the receiver or the transmitter of the USART by setting the corresponding bit, RSTRX and RSTTX respectively, in the US_CR. The software resets clear the status flag and reset internal state machines but the user interface configuration registers hold the value configured prior to software reset. Regardless of what the receiver or the transmitter is performing, the communication is immediately stopped. The user can also independently disable the receiver or the transmitter by setting RXDIS and TXDIS respectively in the US_CR. If the receiver is disabled during a character reception, the USART waits until the end of reception of the current character, then the reception is stopped. If the transmitter is disabled while it is operating, the USART waits the end of transmission of both the current character and character being stored in the Transmit Holding register (US_THR). If a timeguard is programmed, it is handled normally. 36.6.3 Synchronous and Asynchronous Modes 36.6.3.1 Transmitter Operations The transmitter performs the same in both Synchronous and Asynchronous operating modes (SYNC = 0 or SYNC = 1). One start bit, up to 9 data bits, one optional parity bit and up to two stop bits are successively shifted out on the TXD pin at each falling edge of the programmed serial clock. The number of data bits is selected by the CHRL field and the MODE 9 bit in US_MR. Nine bits are selected by setting the MODE 9 bit regardless of the CHRL field. The parity bit is set according to the PAR field in US_MR. The even, odd, space, marked or none parity bit can be configured. The MSBF field in the US_MR configures which data bit is sent first. If written to 1, the most significant bit is sent first. If written to 0, the less significant bit is sent first. The number of stop bits is selected by the NBSTOP field in the US_MR. The 1.5 stop bit is supported in Asynchronous mode only. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 787 Figure 36-5. Character Transmit Example: 8-bit, Parity Enabled One Stop Baud Rate Clock TXD D0 Start Bit D1 D2 D3 D4 D5 D6 D7 Parity Bit Stop Bit The characters are sent by writing in the Transmit Holding register (US_THR). The transmitter reports two status bits in the Channel Status register (US_CSR): TXRDY (Transmitter Ready), which indicates that US_THR is empty and TXEMPTY, which indicates that all the characters written in US_THR have been processed. When the current character processing is completed, the last character written in US_THR is transferred into the Shift register of the transmitter and US_THR becomes empty, thus TXRDY rises. Both TXRDY and TXEMPTY bits are low when the transmitter is disabled. Writing a character in US_THR while TXRDY is low has no effect and the written character is lost. Figure 36-6. Transmitter Status Baud Rate Clock TXD Start D0 Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Start D0 Bit Bit Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Bit Bit Write US_THR TXRDY TXEMPTY 36.6.3.2 Manchester Encoder When the Manchester encoder is in use, characters transmitted through the USART are encoded based on biphase Manchester II format. To enable this mode, set the MAN bit in the US_MR to 1. Depending on polarity configuration, a logic level (zero or one), is transmitted as a coded signal one-to-zero or zero-to-one. Thus, a transition always occurs at the midpoint of each bit time. It consumes more bandwidth than the original NRZ signal (2x) but the receiver has more error control since the expected input must show a change at the center of a bit cell. An example of Manchester encoded sequence is: the byte 0xB1 or 10110001 encodes to 10 01 10 10 01 01 01 10, assuming the default polarity of the encoder. Figure 36-7 illustrates this coding scheme. Figure 36-7. NRZ to Manchester Encoding NRZ encoded data 1 0 1 1 0 0 0 1 Manchester encoded Txd data The Manchester encoded character can also be encapsulated by adding both a configurable preamble and a start frame delimiter pattern. Depending on the configuration, the preamble is a training sequence, composed of a 788 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 predefined pattern with a programmable length from 1 to 15 bit times. If the preamble length is set to 0, the preamble waveform is not generated prior to any character. The preamble pattern is chosen among the following sequences: ALL_ONE, ALL_ZERO, ONE_ZERO or ZERO_ONE, writing the field TX_PP in the US_MAN register, the field TX_PL is used to configure the preamble length. Figure 36-8 illustrates and defines the valid patterns. To improve flexibility, the encoding scheme can be configured using the TX_MPOL field in the US_MAN register. If the TX_MPOL field is set to zero (default), a logic zero is encoded with a zero-to-one transition and a logic one is encoded with a one-to-zero transition. If the TX_MPOL field is set to 1, a logic one is encoded with a one-to-zero transition and a logic zero is encoded with a zero-to-one transition. Figure 36-8. Preamble Patterns, Default Polarity Assumed Manchester encoded data Txd SFD DATA SFD DATA SFD DATA SFD DATA 8-bit width "ALL_ONE" Preamble Manchester encoded data Txd 8-bit width "ALL_ZERO" Preamble Manchester encoded data Txd 8-bit width "ZERO_ONE" Preamble Manchester encoded data Txd 8-bit width "ONE_ZERO" Preamble A start frame delimiter is to be configured using the ONEBIT bit in the US_MR. It consists of a user-defined pattern that indicates the beginning of a valid data. Figure 36-9 illustrates these patterns. If the start frame delimiter, also known as the start bit, is one bit, (ONEBIT = 1), a logic zero is Manchester encoded and indicates that a new character is being sent serially on the line. If the start frame delimiter is a synchronization pattern also referred to as sync (ONE BIT to 0), a sequence of three bit times is sent serially on the line to indicate the start of a new character. The sync waveform is in itself an invalid Manchester waveform as the transition occurs at the middle of the second bit time. Two distinct sync patterns are used: the command sync and the data sync. The command sync has a logic one level for one and a half bit times, then a transition to logic zero for the second one and a half bit times. If the MODSYNC bit in the US_MR is set to 1, the next character is a command. If it is set to 0, the next character is a data. When direct memory access is used, the MODSYNC field can be immediately updated with a modified character located in memory. To enable this mode, VAR_SYNC bit in US_MR must be set to 1. In this case, the MODSYNC bit in the US_MR is bypassed and the sync configuration is held in the TXSYNH in the US_THR. The USART character format is modified and includes sync information. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 789 Figure 36-9. Start Frame Delimiter Preamble Length is set to 0 SFD Manchester encoded data DATA Txd One bit start frame delimiter SFD Manchester encoded data DATA Txd SFD Manchester encoded data Command Sync start frame delimiter DATA Txd Data Sync start frame delimiter Drift Compensation Drift compensation is available only in 16X oversampling mode. An hardware recovery system allows a larger clock drift. To enable the hardware system, the bit in the USART_MAN register must be set. If the RXD edge is one 16X clock cycle from the expected edge, this is considered as normal jitter and no corrective actions is taken. If the RXD event is between 4 and 2 clock cycles before the expected edge, then the current period is shortened by one clock cycle. If the RXD event is between 2 and 3 clock cycles after the expected edge, then the current period is lengthened by one clock cycle. These intervals are considered to be drift and so corrective actions are automatically taken. Figure 36-10. Bit Resynchronization Oversampling 16x Clock RXD Sampling point Expected edge Synchro. Error 36.6.3.3 Synchro. Jump Tolerance Sync Jump Synchro. Error Asynchronous Receiver If the USART is programmed in Asynchronous operating mode (SYNC = 0), the receiver oversamples the RXD input line. The oversampling is either 16 or 8 times the baud rate clock, depending on the OVER bit in the US_MR. The receiver samples the RXD line. If the line is sampled during one half of a bit time to 0, a start bit is detected and data, parity and stop bits are successively sampled on the bit rate clock. If the oversampling is 16 (OVER = 0), a start is detected at the eighth sample to 0. Data bits, parity bit and stop bit are assumed to have a duration corresponding to 16 oversampling clock cycles. If the oversampling is 8 (OVER = 1), a start bit is detected at the fourth sample to 0. Data bits, parity bit and stop bit are assumed to have a duration corresponding to 8 oversampling clock cycles. 790 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The number of data bits, first bit sent and Parity mode are selected by the same fields and bits as the transmitter, i.e., respectively CHRL, MODE9, MSBF and PAR. For the synchronization mechanism only, the number of stop bits has no effect on the receiver as it considers only one stop bit, regardless of the field NBSTOP, so that resynchronization between the receiver and the transmitter can occur. Moreover, as soon as the stop bit is sampled, the receiver starts looking for a new start bit so that resynchronization can also be accomplished when the transmitter is operating with one stop bit. Figure 36-11 and Figure 36-12 illustrate start detection and character reception when USART operates in Asynchronous mode. Figure 36-11. Asynchronous Start Detection Baud Rate Clock Sampling Clock (x16) RXD Sampling 1 2 3 4 5 6 7 8 1 2 3 4 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 D0 Sampling Start Detection RXD Sampling 1 2 3 4 5 6 7 0 1 Start Rejection Figure 36-12. Asynchronous Character Reception Example: 8-bit, Parity Enabled Baud Rate Clock RXD Start Detection 16 16 16 16 16 16 16 16 16 16 samples samples samples samples samples samples samples samples samples samples D0 36.6.3.4 D1 D2 D3 D4 D5 D6 D7 Parity Bit Stop Bit Manchester Decoder When the MAN bit in the US_MR is set to 1, the Manchester decoder is enabled. The decoder performs both preamble and start frame delimiter detection. One input line is dedicated to Manchester encoded input data. An optional preamble sequence can be defined, its length is user-defined and totally independent of the emitter side. Use RX_PL in US_MAN register to configure the length of the preamble sequence. If the length is set to 0, no preamble is detected and the function is disabled. In addition, the polarity of the input stream is programmable with RX_MPOL bit in US_MAN register. Depending on the desired application the preamble pattern matching is to be defined via the RX_PP field in US_MAN. See Figure 36-8 for available preamble patterns. Unlike preamble, the start frame delimiter is shared between Manchester Encoder and Decoder. So, if ONEBIT field is set to 1, only a zero encoded Manchester can be detected as a valid start frame delimiter. If ONEBIT is set SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 791 to 0, only a sync pattern is detected as a valid start frame delimiter. Decoder operates by detecting transition on incoming stream. If RXD is sampled during one quarter of a bit time to zero, a start bit is detected. See Figure 3613. The sample pulse rejection mechanism applies. Figure 36-13. Asynchronous Start Bit Detection Sampling Clock (16 x) Manchester encoded data Txd Start Detection 1 2 3 4 The receiver is activated and starts preamble and frame delimiter detection, sampling the data at one quarter and then three quarters. If a valid preamble pattern or start frame delimiter is detected, the receiver continues decoding with the same synchronization. If the stream does not match a valid pattern or a valid start frame delimiter, the receiver resynchronizes on the next valid edge.The minimum time threshold to estimate the bit value is three quarters of a bit time. If a valid preamble (if used) followed with a valid start frame delimiter is detected, the incoming stream is decoded into NRZ data and passed to USART for processing. Figure 36-14 illustrates Manchester pattern mismatch. When incoming data stream is passed to the USART, the receiver is also able to detect Manchester code violation. A code violation is a lack of transition in the middle of a bit cell. In this case, MANE flag in the US_CSR is raised. It is cleared by writing a 1 to the RSTSTA in the US_CR. See Figure 36-15 for an example of Manchester error detection during data phase. Figure 36-14. Preamble Pattern Mismatch Preamble Mismatch Manchester coding error Manchester encoded data Preamble Mismatch invalid pattern SFD Txd DATA Preamble Length is set to 8 Figure 36-15. Manchester Error Flag Preamble Length is set to 4 Elementary character bit time SFD Manchester encoded data Txd Entering USART character area sampling points Preamble subpacket and Start Frame Delimiter were successfully decoded 792 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Manchester Coding Error detected When the start frame delimiter is a sync pattern (ONEBIT field to 0), both command and data delimiter are supported. If a valid sync is detected, the received character is written as RXCHR field in the US_RHR and the RXSYNH is updated. RXCHR is set to 1 when the received character is a command, and it is set to 0 if the received character is a data. This mechanism alleviates and simplifies the direct memory access as the character contains its own sync field in the same register. As the decoder is setup to be used in Unipolar mode, the first bit of the frame has to be a zero-to-one transition. 36.6.3.5 Radio Interface: Manchester Encoded USART Application This section describes low data rate RF transmission systems and their integration with a Manchester encoded USART. These systems are based on transmitter and receiver ICs that support ASK and FSK modulation schemes. The goal is to perform full duplex radio transmission of characters using two different frequency carriers. See the configuration in Figure 36-16. Figure 36-16. Manchester Encoded Characters RF Transmission Fup frequency Carrier ASK/FSK Upstream Receiver Upstream Emitter LNA VCO RF filter Demod Serial Configuration Interface control Fdown frequency Carrier bi-dir line Manchester decoder USART Receiver Manchester encoder USART Emitter ASK/FSK downstream transmitter Downstream Receiver PA RF filter Mod VCO control The USART peripheral is configured as a Manchester encoder/decoder. Looking at the downstream communication channel, Manchester encoded characters are serially sent to the RF emitter. This may also include a user defined preamble and a start frame delimiter. Mostly, preamble is used in the RF receiver to distinguish between a valid data from a transmitter and signals due to noise. The Manchester stream is then modulated. See Figure 36-17 for an example of ASK modulation scheme. When a logic one is sent to the ASK modulator, the power amplifier, referred to as PA, is enabled and transmits an RF signal at downstream frequency. When a logic zero is transmitted, the RF signal is turned off. If the FSK modulator is activated, two different frequencies are used to transmit data. When a logic 1 is sent, the modulator outputs an RF signal at frequency F0 and switches to F1 if the data sent is a 0. See Figure 36-18. From the receiver side, another carrier frequency is used. The RF receiver performs a bit check operation examining demodulated data stream. If a valid pattern is detected, the receiver switches to Receiving mode. The demodulated stream is sent to the Manchester decoder. Because of bit checking inside RF IC, the data transferred to the microcontroller is reduced by a user-defined number of bits. The Manchester preamble length is to be defined in accordance with the RF IC configuration. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 793 Figure 36-17. ASK Modulator Output 1 0 0 1 0 0 1 NRZ stream Manchester encoded data default polarity unipolar output Txd ASK Modulator Output Uptstream Frequency F0 Figure 36-18. FSK Modulator Output 1 NRZ stream Manchester encoded data default polarity unipolar output Txd FSK Modulator Output Uptstream Frequencies [F0, F0+offset] 36.6.3.6 Synchronous Receiver In Synchronous mode (SYNC = 1), the receiver samples the RXD signal on each rising edge of the baud rate clock. If a low level is detected, it is considered as a start. All data bits, the parity bit and the stop bits are sampled and the receiver waits for the next start bit. Synchronous mode operations provide a high-speed transfer capability. Configuration fields and bits are the same as in Asynchronous mode. Figure 36-19 illustrates a character reception in Synchronous mode. Figure 36-19. Synchronous Mode Character Reception Example: 8-bit, Parity Enabled 1 Stop Baud Rate Clock RXD Sampling Start D0 D1 D2 D3 D4 D5 D6 D7 Stop Bit Parity Bit 36.6.3.7 Receiver Operations When a character reception is completed, it is transferred to the Receive Holding register (US_RHR) and the RXRDY bit in US_CSR rises. If a character is completed while the RXRDY is set, the OVRE (Overrun Error) bit is set. The last character is transferred into US_RHR and overwrites the previous one. The OVRE bit is cleared by writing a 1 to the RSTSTA (Reset Status) bit in the US_CR. 794 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 36-20. Receiver Status Baud Rate Clock RXD Start D0 Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Start D0 Bit Bit Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Bit Bit RSTSTA = 1 Write US_CR Read US_RHR RXRDY OVRE 36.6.3.8 Parity The USART supports five Parity modes that are selected by writing to the PAR field in the US_MR. The PAR field also enables the Multidrop mode, see Section 36.6.3.9 "Multidrop Mode". Even and odd parity bit generation and error detection are supported. If even parity is selected, the parity generator of the transmitter drives the parity bit to 0 if a number of 1s in the character data bit is even, and to 1 if the number of 1s is odd. Accordingly, the receiver parity checker counts the number of received 1s and reports a parity error if the sampled parity bit does not correspond. If odd parity is selected, the parity generator of the transmitter drives the parity bit to 1 if a number of 1s in the character data bit is even, and to 0 if the number of 1s is odd. Accordingly, the receiver parity checker counts the number of received 1s and reports a parity error if the sampled parity bit does not correspond. If the mark parity is used, the parity generator of the transmitter drives the parity bit to 1 for all characters. The receiver parity checker reports an error if the parity bit is sampled to 0. If the space parity is used, the parity generator of the transmitter drives the parity bit to 0 for all characters. The receiver parity checker reports an error if the parity bit is sampled to 1. If parity is disabled, the transmitter does not generate any parity bit and the receiver does not report any parity error. Table 36-8 shows an example of the parity bit for the character 0x41 (character ASCII "A") depending on the configuration of the USART. Because there are two bits set to 1 in the character value, the parity bit is set to 1 when the parity is odd, or configured to 0 when the parity is even. Table 36-8. Parity Bit Examples Character Hexadecimal Binary Parity Bit Parity Mode A 0x41 0100 0001 1 Odd A 0x41 0100 0001 0 Even A 0x41 0100 0001 1 Mark A 0x41 0100 0001 0 Space A 0x41 0100 0001 None None When the receiver detects a parity error, it sets the PARE (Parity Error) bit in the US_CSR. The PARE bit can be cleared by writing a 1 to the RSTSTA bit the US_CR. Figure 36-21 illustrates the parity bit status setting and clearing. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 795 Figure 36-21. Parity Error Baud Rate Clock RXD Start D0 Bit D1 D2 D3 D4 D5 D6 D7 Bad Stop Parity Bit Bit RSTSTA = 1 Write US_CR PARE Parity Error Detect Time Flags Report Time RXRDY 36.6.3.9 Multidrop Mode If the value 0x6 or 0x07 is written to the PAR field in the US_MR, the USART runs in Multidrop mode. This mode differentiates the data characters and the address characters. Data is transmitted with the parity bit at 0 and addresses are transmitted with the parity bit at 1. If the USART is configured in Multidrop mode, the receiver sets the PARE parity error bit when the parity bit is high and the transmitter is able to send a character with the parity bit high when a 1 is written to the SENTA bit in the US_CR. To handle parity error, the PARE bit is cleared when a 1 is written to the RSTSTA bit in the US_CR. The transmitter sends an address byte (parity bit set) when SENDA is written to in the US_CR. In this case, the next byte written to the US_THR is transmitted as an address. Any character written in the US_THR without having written the command SENDA is transmitted normally with the parity at 0. 36.6.3.10 Transmitter Timeguard The timeguard feature enables the USART interface with slow remote devices. The timeguard function enables the transmitter to insert an idle state on the TXD line between two characters. This idle state actually acts as a long stop bit. The duration of the idle state is programmed in the TG field of the Transmitter Timeguard register (US_TTGR). When this field is written to zero no timeguard is generated. Otherwise, the transmitter holds a high level on TXD after each transmitted byte during the number of bit periods programmed in TG in addition to the number of stop bits. As illustrated in Figure 36-22, the behavior of TXRDY and TXEMPTY status bits is modified by the programming of a timeguard. TXRDY rises only when the start bit of the next character is sent, and thus remains to 0 during the timeguard transmission if a character has been written in US_THR. TXEMPTY remains low until the timeguard transmission is completed as the timeguard is part of the current character being transmitted. 796 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 36-22. Timeguard Operations TG = 4 TG = 4 Baud Rate Clock TXD Start D0 Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Bit Bit Start D0 Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Bit Bit Write US_THR TXRDY TXEMPTY Table 36-9 indicates the maximum length of a timeguard period that the transmitter can handle in relation to the function of the baud rate. Table 36-9. 36.6.3.11 Maximum Timeguard Length Depending on Baud Rate Baud Rate (bit/s) Bit Time (s) Timeguard (ms) 1,200 833 212.50 9,600 104 26.56 14,400 69.4 17.71 19,200 52.1 13.28 28,800 34.7 8.85 38,400 26 6.63 56,000 17.9 4.55 57,600 17.4 4.43 115,200 8.7 2.21 Receiver Time-out The Receiver Time-out provides support in handling variable-length frames. This feature detects an idle condition on the RXD line. When a time-out is detected, the bit TIMEOUT in the US_CSR rises and can generate an interrupt, thus indicating to the driver an end of frame. The time-out delay period (during which the receiver waits for a new character) is programmed in the TO field of the Receiver Time-out register (US_RTOR). If the TO field is written to 0, the Receiver Time-out is disabled and no time-out is detected. The TIMEOUT bit in the US_CSR remains at 0. Otherwise, the receiver loads a 16-bit counter with the value programmed in TO. This counter is decremented at each bit period and reloaded each time a new character is received. If the counter reaches 0, the TIMEOUT bit in US_CSR rises. Then, the user can either: Stop the counter clock until a new character is received. This is performed by writing a 1 to the STTTO (Start Time-out) bit in the US_CR. In this case, the idle state on RXD before a new character is received will not provide a time-out. This prevents having to handle an interrupt before a character is received and allows waiting for the next idle state on RXD after a frame is received. Obtain an interrupt while no character is received. This is performed by writing a 1 to the RETTO (Reload and Start Time-out) bit in the US_CR. If RETTO is performed, the counter starts counting down immediately from the value TO. This enables generation of a periodic interrupt so that a user time-out can be handled, for example when no key is pressed on a keyboard. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 797 If STTTO is performed, the counter clock is stopped until a first character is received. The idle state on RXD before the start of the frame does not provide a time-out. This prevents having to obtain a periodic interrupt and enables a wait of the end of frame when the idle state on RXD is detected. If RETTO is performed, the counter starts counting down immediately from the value TO. This enables generation of a periodic interrupt so that a user time-out can be handled, for example when no key is pressed on a keyboard. Figure 36-23 shows the block diagram of the Receiver Time-out feature. Figure 36-23. Receiver Time-out Block Diagram TO Baud Rate Clock 1 D Clock Q 16-bit Time-out Counter 16-bit Value = STTTO Character Received RETTO Load Clear TIMEOUT 0 Table 36-10 gives the maximum time-out period for some standard baud rates. Table 36-10. 36.6.3.12 Maximum Time-out Period Baud Rate (bit/s) Bit Time (s) Time-out (ms) 600 1,667 109,225 1,200 833 54,613 2,400 417 27,306 4,800 208 13,653 9,600 104 6,827 14,400 69 4,551 19,200 52 3,413 28,800 35 2,276 38,400 26 1,704 56,000 18 1,170 57,600 17 1,138 200,000 5 328 Framing Error The receiver is capable of detecting framing errors. A framing error happens when the stop bit of a received character is detected at level 0. This can occur if the receiver and the transmitter are fully desynchronized. A framing error is reported on the FRAME bit of US_CSR. The FRAME bit is asserted in the middle of the stop bit as soon as the framing error is detected. It is cleared by writing a 1 to the RSTSTA bit in the US_CR. 798 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 36-24. Framing Error Status Baud Rate Clock RXD Start D0 Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Bit Bit RSTSTA = 1 Write US_CR FRAME RXRDY 36.6.3.13 Transmit Break The user can request the transmitter to generate a break condition on the TXD line. A break condition drives the TXD line low during at least one complete character. It appears the same as a 0x00 character sent with the parity and the stop bits at 0. However, the transmitter holds the TXD line at least during one character until the user requests the break condition to be removed. A break is transmitted by writing a 1 to the STTBRK bit in the US_CR. This can be performed at any time, either while the transmitter is empty (no character in either the Shift register or in US_THR) or when a character is being transmitted. If a break is requested while a character is being shifted out, the character is first completed before the TXD line is held low. Once STTBRK command is requested further STTBRK commands are ignored until the end of the break is completed. The break condition is removed by writing a 1 to the STPBRK bit in the US_CR. If the STPBRK is requested before the end of the minimum break duration (one character, including start, data, parity and stop bits), the transmitter ensures that the break condition completes. The transmitter considers the break as though it is a character, i.e., the STTBRK and STPBRK commands are processed only if the TXRDY bit in US_CSR is to 1 and the start of the break condition clears the TXRDY and TXEMPTY bits as if a character is processed. Writing US_CR with both STTBRK and STPBRK bits to 1 can lead to an unpredictable result. All STPBRK commands requested without a previous STTBRK command are ignored. A byte written into the Transmit Holding register while a break is pending, but not started, is ignored. After the break condition, the transmitter returns the TXD line to 1 for a minimum of 12 bit times. Thus, the transmitter ensures that the remote receiver detects correctly the end of break and the start of the next character. If the timeguard is programmed with a value higher than 12, the TXD line is held high for the timeguard period. After holding the TXD line for this period, the transmitter resumes normal operations. Figure 36-25 illustrates the effect of both the Start Break (STTBRK) and Stop Break (STPBRK) commands on the TXD line. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 799 Figure 36-25. Break Transmission Baud Rate Clock TXD Start D0 Bit D1 D2 D3 D4 D5 D6 D7 Parity Stop Bit Bit STTBRK = 1 Break Transmission End of Break STPBRK = 1 Write US_CR TXRDY TXEMPTY 36.6.3.14 Receive Break The receiver detects a break condition when all data, parity and stop bits are low. This corresponds to detecting a framing error with data to 0x00, but FRAME remains low. When the low stop bit is detected, the receiver asserts the RXBRK bit in US_CSR. This bit may be cleared by writing a 1 to the RSTSTA bit in the US_CR. An end of receive break is detected by a high level for at least 2/16 of a bit period in Asynchronous operating mode or one sample at high level in Synchronous operating mode. The end of break detection also asserts the RXBRK bit. 36.6.3.15 Hardware Handshaking The USART features a hardware handshaking out-of-band flow control. The RTS and CTS pins are used to connect with the remote device, as shown in Figure 36-26. Figure 36-26. Connection with a Remote Device for Hardware Handshaking USART Remote Device TXD RXD RXD TXD CTS RTS RTS CTS Setting the USART to operate with hardware handshaking is performed by writing the USART_MODE field in US_MR to the value 0x2. The USART behavior when hardware handshaking is enabled is the same as the behavior in standard Synchronous or Asynchronous mode, except that the receiver drives the RTS pin as described below and the level on the CTS pin modifies the behavior of the transmitter as described below. Using this mode requires using the PDC channel for reception. The transmitter can handle hardware handshaking in any case. Figure 36-27 shows how the receiver operates if hardware handshaking is enabled. The RTS pin is driven high if the receiver is disabled or if the status RXBUFF (Receive Buffer Full) coming from the PDC channel is high. Normally, the remote device does not start transmitting while its CTS pin (driven by RTS) is high. As soon as the receiver is enabled, the RTS falls, indicating to the remote device that it can start transmitting. Defining a new buffer in the PDC clears the status bit RXBUFF and, as a result, asserts the pin RTS low. 800 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 36-27. Receiver Behavior when Operating with Hardware Handshaking RXD RXEN = 1 RXDIS = 1 Write US_CR RTS RXBUFF Figure 36-28 shows how the transmitter operates if hardware handshaking is enabled. The CTS pin disables the transmitter. If a character is being processed, the transmitter is disabled only after the completion of the current character and transmission of the next character happens as soon as the pin CTS falls. Figure 36-28. Transmitter Behavior when Operating with Hardware Handshaking CTS TXD 36.6.4 ISO7816 Mode The USART features an ISO7816-compatible operating mode. This mode permits interfacing with smart cards and Security Access Modules (SAM) communicating through an ISO7816 link. Both T = 0 and T = 1 protocols defined by the ISO7816 specification are supported. Setting the USART in ISO7816 mode is performed by writing the USART_MODE field in US_MR to the value 0x4 for protocol T = 0 and to the value 0x5 for protocol T = 1. 36.6.4.1 ISO7816 Mode Overview The ISO7816 is a half duplex communication on only one bidirectional line. The baud rate is determined by a division of the clock provided to the remote device (see Section 36-2 "Baud Rate Generator"). The USART connects to a smart card as shown in Figure 36-29. The TXD line becomes bidirectional and the baud rate generator feeds the ISO7816 clock on the SCK pin. As the TXD pin becomes bidirectional, its output remains driven by the output of the transmitter but only when the transmitter is active while its input is directed to the input of the receiver. The USART is considered as the master of the communication as it generates the clock. Figure 36-29. Connection of a Smart Card to the USART USART SCK TXD CLK I/O Smart Card When operating in ISO7816, either in T = 0 or T = 1 modes, the character format is fixed. The configuration is 8 data bits, even parity and 1 or 2 stop bits, regardless of the values programmed in the CHRL, MODE9, PAR and CHMODE fields. MSBF can be used to transmit LSB or MSB first. Parity Bit (PAR) can be used to transmit in normal or inverse mode. Refer to Section 36.7.3 "USART Mode Register" and "PAR: Parity Type" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 801 The USART cannot operate concurrently in both Receiver and Transmitter modes as the communication is unidirectional at a time. It has to be configured according to the required mode by enabling or disabling either the receiver or the transmitter as desired. Enabling both the receiver and the transmitter at the same time in ISO7816 mode may lead to unpredictable results. The ISO7816 specification defines an inverse transmission format. Data bits of the character must be transmitted on the I/O line at their negative value. 36.6.4.2 Protocol T = 0 In T = 0 protocol, a character is made up of one start bit, eight data bits, one parity bit and one guard time, which lasts two bit times. The transmitter shifts out the bits and does not drive the I/O line during the guard time. If no parity error is detected, the I/O line remains at 1 during the guard time and the transmitter can continue with the transmission of the next character, as shown in Figure 36-30. If a parity error is detected by the receiver, it drives the I/O line to 0 during the guard time, as shown in Figure 3631. This error bit is also named NACK, for Non Acknowledge. In this case, the character lasts 1 bit time more, as the guard time length is the same and is added to the error bit time which lasts 1 bit time. When the USART is the receiver and it detects an error, it does not load the erroneous character in the Receive Holding register (US_RHR). It appropriately sets the PARE bit in the Status register (US_SR) so that the software can handle the error. Figure 36-30. T = 0 Protocol without Parity Error Baud Rate Clock RXD Start Bit D0 D1 D2 D3 D4 D5 D6 D7 Parity Guard Guard Next Bit Time 1 Time 2 Start Bit Figure 36-31. T = 0 Protocol with Parity Error Baud Rate Clock Error I/O Start Bit D0 D1 D2 D3 D4 D5 D6 D7 Parity Guard Bit Time 1 Guard Start Time 2 Bit D0 D1 Repetition Receive Error Counter The USART receiver also records the total number of errors. This can be read in the Number of Error (US_NER) register. The NB_ERRORS field can record up to 255 errors. Reading US_NER automatically clears the NB_ERRORS field. Receive NACK Inhibit The USART can also be configured to inhibit an error. This can be achieved by setting the INACK bit in US_MR. If INACK is to 1, no error signal is driven on the I/O line even if a parity bit is detected. Moreover, if INACK is set, the erroneous received character is stored in the Receive Holding register, as if no error occurred and the RXRDY bit does rise. 802 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Transmit Character Repetition When the USART is transmitting a character and gets a NACK, it can automatically repeat the character before moving on to the next one. Repetition is enabled by writing the MAX_ITERATION field in the US_MR at a value higher than 0. Each character can be transmitted up to eight times; the first transmission plus seven repetitions. If MAX_ITERATION does not equal zero, the USART repeats the character as many times as the value loaded in MAX_ITERATION. When the USART repetition number reaches MAX_ITERATION and the last repeated character is not acknowledged, the ITER bit is set in US_CSR. If the repetition of the character is acknowledged by the receiver, the repetitions are stopped and the iteration counter is cleared. The ITER bit in US_CSR can be cleared by writing a 1 to the RSTIT bit in the US_CR. Disable Successive Receive NACK The receiver can limit the number of successive NACKs sent back to the remote transmitter. This is programmed by setting the bit DSNACK in the US_MR. The maximum number of NACKs transmitted is programmed in the MAX_ITERATION field. As soon as MAX_ITERATION is reached, no error signal is driven on the I/O line and the ITER bit in the US_CSR is set. 36.6.4.3 Protocol T = 1 When operating in ISO7816 protocol T = 1, the transmission is similar to an asynchronous format with only one stop bit. The parity is generated when transmitting and checked when receiving. Parity error detection sets the PARE bit in the US_CSR. 36.6.5 IrDA Mode The USART features an IrDA mode supplying half-duplex point-to-point wireless communication. It embeds the modulator and demodulator which allows a glueless connection to the infrared transceivers, as shown in Figure 36-32. The modulator and demodulator are compliant with the IrDA specification version 1.1 and support data transfer speeds ranging from 2.4 kbit/s to 115.2 kbit/s. The IrDA mode is enabled by setting the USART_MODE field in US_MR to the value 0x8. The IrDA Filter register (US_IF) is used to configure the demodulator filter. The USART transmitter and receiver operate in a normal Asynchronous mode and all parameters are accessible. Note that the modulator and the demodulator are activated. Figure 36-32. Connection to IrDA Transceivers USART IrDA Transceivers Receiver Demodulator Transmitter Modulator RXD RX TX TXD The receiver and the transmitter must be enabled or disabled depending on the direction of the transmission to be managed. To receive IrDA signals, the following needs to be done: Disable TX and Enable RX Configure the TXD pin as PIO and set it as an output to 0 (to avoid LED emission). Disable the internal pullup (better for power consumption). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 803 36.6.5.1 Receive data IrDA Modulation For baud rates up to and including 115.2 kbit/s, the RZI modulation scheme is used. "0" is represented by a light pulse of 3/16th of a bit time. Some examples of signal pulse duration are shown in Table 36-11. Table 36-11. IrDA Pulse Duration Baud Rate Pulse Duration (3/16) 2.4 kbit/s 78.13 s 9.6 kbit/s 19.53 s 19.2 kbit/s 9.77 s 38.4 kbit/s 4.88 s 57.6 kbit/s 3.26 s 115.2 kbit/s 1.63 s Figure 36-33 shows an example of character transmission. Figure 36-33. IrDA Modulation Start Bit Transmitter Output 0 Stop Bit Data Bits 0 1 1 0 0 1 1 0 1 TXD Bit Period 36.6.5.2 3/16 Bit Period IrDA Baud Rate Table 36-12 gives some examples of CD values, baud rate error and pulse duration. Note that the requirement on the maximum acceptable error of 1.87% must be met. Table 36-12. IrDA Baud Rate Error Peripheral Clock 804 Baud Rate (bit/s) CD Baud Rate Error Pulse Time (s) 3,686,400 115,200 2 0.00% 1.63 20,000,000 115,200 11 1.38% 1.63 32,768,000 115,200 18 1.25% 1.63 40,000,000 115,200 22 1.38% 1.63 3,686,400 57,600 4 0.00% 3.26 20,000,000 57,600 22 1.38% 3.26 32,768,000 57,600 36 1.25% 3.26 40,000,000 57,600 43 0.93% 3.26 3,686,400 38,400 6 0.00% 4.88 20,000,000 38,400 33 1.38% 4.88 32,768,000 38,400 53 0.63% 4.88 40,000,000 38,400 65 0.16% 4.88 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 36-12. IrDA Baud Rate Error (Continued) Peripheral Clock 36.6.5.3 Baud Rate (bit/s) CD Baud Rate Error Pulse Time (s) 3,686,400 19,200 12 0.00% 9.77 20,000,000 19,200 65 0.16% 9.77 32,768,000 19,200 107 0.31% 9.77 40,000,000 19,200 130 0.16% 9.77 3,686,400 9,600 24 0.00% 19.53 20,000,000 9,600 130 0.16% 19.53 32,768,000 9,600 213 0.16% 19.53 40,000,000 9,600 260 0.16% 19.53 3,686,400 2,400 96 0.00% 78.13 20,000,000 2,400 521 0.03% 78.13 32,768,000 2,400 853 0.04% 78.13 IrDA Demodulator The demodulator is based on the IrDA Receive filter comprised of an 8-bit down counter which is loaded with the value programmed in US_IF. When a falling edge is detected on the RXD pin, the Filter Counter starts counting down at the peripheral clock speed. If a rising edge is detected on the RXD pin, the counter stops and is reloaded with US_IF. If no rising edge is detected when the counter reaches 0, the input of the receiver is driven low during one bit time. Figure 36-34 illustrates the operations of the IrDA demodulator. Figure 36-34. IrDA Demodulator Operations MCK RXD Counter Value 6 Receiver Input 5 4 3 Pulse Rejected 2 6 6 5 4 3 2 1 0 Pulse Accepted The programmed value in the US_IF register must always meet the following criteria: tperipheral clock x (IRDA_FILTER + 3) < 1.41 s As the IrDA mode uses the same logic as the ISO7816, note that the FI_DI_RATIO field in US_FIDI must be set to a value higher than 0 in order to make sure IrDA communications operate correctly. 36.6.6 RS485 Mode The USART features the RS485 mode to enable line driver control. While operating in RS485 mode, the USART behaves as though in Asynchronous or Synchronous mode and configuration of all the parameters is possible. The difference is that the RTS pin is driven high when the transmitter is operating. The behavior of the RTS pin is controlled by the TXEMPTY bit. A typical connection of the USART to an RS485 bus is shown in Figure 36-35. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 805 Figure 36-35. Typical Connection to a RS485 Bus USART RXD Differential Bus TXD RTS The USART is set in RS485 mode by writing the value 0x1 to the USART_MODE field in US_MR. The RTS pin is at a level inverse to the TXEMPTY bit. Significantly, the RTS pin remains high when a timeguard is programmed so that the line can remain driven after the last character completion. Figure 36-36 gives an example of the RTS waveform during a character transmission when the timeguard is enabled. Figure 36-36. Example of RTS Drive with Timeguard TG = 4 1 Baud Rate Clock TXD Start D0 Bit RTS Write US_THR TXRDY TXEMPTY 806 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 D1 D2 D3 D4 D5 D6 D7 Parity Stop Bit Bit 36.6.7 Modem Mode The USART features Modem mode, which enables control of the signals: DTR (Data Terminal Ready), DSR (Data Set Ready), RTS (Request to Send), CTS (Clear to Send), DCD (Data Carrier Detect) and RI (Ring Indicator). While operating in Modem mode, the USART behaves as a DTE (Data Terminal Equipment) as it drives DTR and RTS and can detect level change on DSR, DCD, CTS and RI. Setting the USART in Modem mode is performed by writing the USART_MODE field in US_MR to the value 0x3. While operating in Modem mode, the USART behaves as though in Asynchronous mode and all the parameter configurations are available. Table 36-13 gives the correspondence of the USART signals with modem connection standards. Table 36-13. Circuit References USART Pin V24 CCITT Direction TXD 2 103 From terminal to modem RTS 4 105 From terminal to modem DTR 20 108.2 From terminal to modem RXD 3 104 From modem to terminal CTS 5 106 From terminal to modem DSR 6 107 From terminal to modem DCD 8 109 From terminal to modem RI 22 125 From terminal to modem The control of the DTR output pin is performed by writing a 1 to the DTRDIS and DTREN bits respectively in US_CR. The disable command forces the corresponding pin to its inactive level, i.e., high. The enable command forces the corresponding pin to its active level, i.e., low. The RTS output pin is automatically controlled in this mode. The level changes are detected on the RI, DSR, DCD and CTS pins. If an input change is detected, the RIIC, DSRIC, DCDIC and CTSIC bits in US_CSR are set respectively and can trigger an interrupt. The status is automatically cleared when US_CSR is read. Furthermore, the CTS automatically disables the transmitter when it is detected at its inactive state. If a character is being transmitted when the CTS rises, the character transmission is completed before the transmitter is actually disabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 807 36.6.8 SPI Mode The Serial Peripheral Interface (SPI) mode is a synchronous serial data link that provides communication with external devices in Master or Slave mode. It also enables communication between processors if an external processor is connected to the system. The Serial Peripheral Interface is essentially a shift register that serially transmits data bits to other SPIs. During a data transfer, one SPI system acts as the "master" which controls the data flow, while the other devices act as "slaves'' which have data shifted into and out by the master. Different CPUs can take turns being masters and one master may simultaneously shift data into multiple slaves. (Multiple master protocol is the opposite of single master protocol, where one CPU is always the master while all of the others are always slaves.) However, only one slave may drive its output to write data back to the master at any given time. A slave device is selected when its NSS signal is asserted by the master. The USART in SPI Master mode can address only one SPI slave because it can generate only one NSS signal. The SPI system consists of two data lines and two control lines: Master Out Slave In (MOSI): This data line supplies the output data from the master shifted into the input of the slave. Master In Slave Out (MISO): This data line supplies the output data from a slave to the input of the master. Serial Clock (SCK): This control line is driven by the master and regulates the flow of the data bits. The master may transmit data at a variety of baud rates. The SCK line cycles once for each bit that is transmitted. Slave Select (NSS): This control line allows the master to select or deselect the slave. 36.6.8.1 Modes of Operation The USART can operate in SPI Master mode or in SPI Slave mode. Operation in SPI Master mode is programmed by writing 0xE to the USART_MODE field in US_MR. In this case the SPI lines must be connected as described below: The MOSI line is driven by the output pin TXD The MISO line drives the input pin RXD The SCK line is driven by the output pin SCK The NSS line is driven by the output pin RTS Operation in SPI Slave mode is programmed by writing to 0xF the USART_MODE field in US_MR. In this case the SPI lines must be connected as described below: The MOSI line drives the input pin RXD The MISO line is driven by the output pin TXD The SCK line drives the input pin SCK The NSS line drives the input pin CTS In order to avoid unpredictable behavior, any change of the SPI mode must be followed by a software reset of the transmitter and of the receiver (except the initial configuration after a hardware reset). (See Section 36.6.8.4). 36.6.8.2 Baud Rate In SPI mode, the baud rate generator operates in the same way as in USART Synchronous mode. See Section 36.6.1.3 "Baud Rate in Synchronous Mode or SPI Mode". However, there are some restrictions: In SPI Master mode: 808 The external clock SCK must not be selected (USCLKS 0x3), and the bit CLKO must be set to 1 in the US_MR, in order to generate correctly the serial clock on the SCK pin. To obtain correct behavior of the receiver and the transmitter, the value programmed in CD must be superior or equal to 6. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 If the divided peripheral clock is selected, the value programmed in CD must be even to ensure a 50:50 mark/space ratio on the SCK pin, this value can be odd if the peripheral clock is selected. In SPI Slave mode: 36.6.8.3 The external clock (SCK) selection is forced regardless of the value of the USCLKS field in the US_MR. Likewise, the value written in US_BRGR has no effect, because the clock is provided directly by the signal on the USART SCK pin. To obtain correct behavior of the receiver and the transmitter, the external clock (SCK) frequency must be at least 6 times lower than the system clock. Data Transfer Up to nine data bits are successively shifted out on the TXD pin at each rising or falling edge (depending of CPOL and CPHA) of the programmed serial clock. There is no Start bit, no Parity bit and no Stop bit. The number of data bits is selected by the CHRL field and the MODE 9 bit in the US_MR. The nine bits are selected by setting the MODE 9 bit regardless of the CHRL field. The MSB data bit is always sent first in SPI mode (Master or Slave). Four combinations of polarity and phase are available for data transfers. The clock polarity is programmed with the CPOL bit in the US_MR. The clock phase is programmed with the CPHA bit. These two parameters determine the edges of the clock signal upon which data is driven and sampled. Each of the two parameters has two possible states, resulting in four possible combinations that are incompatible with one another. Thus, a master/slave pair must use the same parameter pair values to communicate. If multiple slaves are used and fixed in different configurations, the master must reconfigure itself each time it needs to communicate with a different slave. Table 36-14. SPI Bus Protocol Mode SPI Bus Protocol Mode CPOL CPHA 0 0 1 1 0 0 2 1 1 3 1 0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 809 Figure 36-37. SPI Transfer Format (CPHA = 1, 8 bits per transfer) SCK cycle (for reference) 1 2 3 4 6 5 7 8 SCK (CPOL = 0) SCK (CPOL = 1) MOSI SPI Master ->TXD SPI Slave -> RXD MISO SPI Master -> RXD SPI Slave -> TXD MSB MSB 6 5 4 3 2 1 LSB 6 5 4 3 2 1 LSB 7 8 NSS SPI Master -> RTS SPI Slave -> CTS Figure 36-38. SPI Transfer Format (CPHA = 0, 8 bits per transfer) SCK cycle (for reference) 1 2 3 4 5 6 SCK (CPOL = 0) SCK (CPOL = 1) MOSI SPI Master -> TXD SPI Slave -> RXD MSB 6 5 4 3 2 1 LSB MISO SPI Master -> RXD SPI Slave -> TXD MSB 6 5 4 3 2 1 LSB NSS SPI Master -> RTS SPI Slave -> CTS 36.6.8.4 Receiver and Transmitter Control See Section 36.6.2 "Receiver and Transmitter Control" 36.6.8.5 Character Transmission The characters are sent by writing in the Transmit Holding register (US_THR). An additional condition for transmitting a character can be added when the USART is configured in SPI Master mode. In the USART Mode Register (SPI_MODE) (USART_MR), the value configured on the bit WRDBT can prevent any character 810 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 transmission (even if US_THR has been written) while the receiver side is not ready (character not read). When WRDBT equals 0, the character is transmitted whatever the receiver status. If WRDBT is set to 1, the transmitter waits for the Receive Holding register (US_RHR) to be read before transmitting the character (RXRDY flag cleared), thus preventing any overflow (character loss) on the receiver side. The transmitter reports two status bits in US_CSR: TXRDY (Transmitter Ready), which indicates that US_THR is empty and TXEMPTY, which indicates that all the characters written in US_THR have been processed. When the current character processing is completed, the last character written in US_THR is transferred into the Shift register of the transmitter and US_THR becomes empty, thus TXRDY rises. Both TXRDY and TXEMPTY bits are low when the transmitter is disabled. Writing a character in US_THR while TXRDY is low has no effect and the written character is lost. If the USART is in SPI Slave mode and if a character must be sent while the US_THR is empty, the UNRE (Underrun Error) bit is set. The TXD transmission line stays at high level during all this time. The UNRE bit is cleared by writing a 1 to the RSTSTA (Reset Status) bit in US_CR. In SPI Master mode, the slave select line (NSS) is asserted at low level one tbit (tbit being the nominal time required to transmit a bit) before the transmission of the MSB bit and released at high level one tbit after the transmission of the LSB bit. So, the slave select line (NSS) is always released between each character transmission and a minimum delay of three tbit always inserted. However, in order to address slave devices supporting the CSAAT mode (Chip Select Active After Transfer), the slave select line (NSS) can be forced at low level by writing a 1 to the RTSEN bit in the US_CR. The slave select line (NSS) can be released at high level only by writing a 1 to the RTSDIS bit in the US_CR (for example, when all data have been transferred to the slave device). In SPI Slave mode, the transmitter does not require a falling edge of the slave select line (NSS) to initiate a character transmission but only a low level. However, this low level must be present on the slave select line (NSS) at least one tbit before the first serial clock cycle corresponding to the MSB bit. 36.6.8.6 Character Reception When a character reception is completed, it is transferred to the Receive Holding register (US_RHR) and the RXRDY bit in the Status register (US_CSR) rises. If a character is completed while RXRDY is set, the OVRE (Overrun Error) bit is set. The last character is transferred into US_RHR and overwrites the previous one. The OVRE bit is cleared by writing a 1 to the RSTSTA (Reset Status) bit in the US_CR. To ensure correct behavior of the receiver in SPI Slave mode, the master device sending the frame must ensure a minimum delay of one tbit between each character transmission. The receiver does not require a falling edge of the slave select line (NSS) to initiate a character reception but only a low level. However, this low level must be present on the slave select line (NSS) at least one tbit before the first serial clock cycle corresponding to the MSB bit. 36.6.8.7 Receiver Timeout Because the receiver baud rate clock is active only during data transfers in SPI mode, a receiver timeout is impossible in this mode, whatever the time-out value is (field TO) in the US_RTOR. 36.6.9 Test Modes The USART can be programmed to operate in three different test modes. The internal loopback capability allows on-board diagnostics. In Loopback mode, the USART interface pins are disconnected or not and reconfigured for loopback internally or externally. 36.6.9.1 Normal Mode Normal mode connects the RXD pin on the receiver input and the transmitter output on the TXD pin. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 811 Figure 36-39. Normal Mode Configuration RXD Receiver TXD Transmitter 36.6.9.2 Automatic Echo Mode Automatic echo mode allows bit-by-bit retransmission. When a bit is received on the RXD pin, it is sent to the TXD pin, as shown in Figure 36-40. Programming the transmitter has no effect on the TXD pin. The RXD pin is still connected to the receiver input, thus the receiver remains active. Figure 36-40. Automatic Echo Mode Configuration RXD Receiver TXD Transmitter 36.6.9.3 Local Loopback Mode Local loopback mode connects the output of the transmitter directly to the input of the receiver, as shown in Figure 36-41. The TXD and RXD pins are not used. The RXD pin has no effect on the receiver and the TXD pin is continuously driven high, as in idle state. Figure 36-41. Local Loopback Mode Configuration RXD Receiver 1 Transmitter 36.6.9.4 TXD Remote Loopback Mode Remote loopback mode directly connects the RXD pin to the TXD pin, as shown in Figure 36-42. The transmitter and the receiver are disabled and have no effect. This mode allows bit-by-bit retransmission. Figure 36-42. Remote Loopback Mode Configuration Receiver 1 RXD TXD Transmitter 812 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.6.10 Register Write Protection To prevent any single software error from corrupting USART behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the USART Write Protection Mode Register (US_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the USART Write Protection Status Register (US_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading the US_WPSR. The following registers can be write-protected: USART Mode Register USART Baud Rate Generator Register USART Receiver Time-out Register USART Transmitter Timeguard Register USART FI DI RATIO Register USART IrDA Filter Register USART Manchester Configuration Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 813 36.7 Universal Synchronous Asynchronous Receiver Transmitter (USART) User Interface Table 36-15. Register Mapping Offset Register Name Access Reset 0x0000 Control Register US_CR Write-only - 0x0004 Mode Register US_MR Read/Write 0x0 0x0008 Interrupt Enable Register US_IER Write-only - 0x000C Interrupt Disable Register US_IDR Write-only - 0x0010 Interrupt Mask Register US_IMR Read-only 0x0 0x0014 Channel Status Register US_CSR Read-only 0x0 0x0018 Receive Holding Register US_RHR Read-only 0x0 0x001C Transmit Holding Register US_THR Write-only - 0x0020 Baud Rate Generator Register US_BRGR Read/Write 0x0 0x0024 Receiver Time-out Register US_RTOR Read/Write 0x0 0x0028 Transmitter Timeguard Register US_TTGR Read/Write 0x0 Reserved - - - 0x0040 FI DI Ratio Register US_FIDI Read/Write 0x174 0x0044 Number of Errors Register US_NER Read-only 0x0 0x0048 Reserved - - - 0x004C IrDA Filter Register US_IF Read/Write 0x0 0x0050 Manchester Configuration Register US_MAN Read/Write 0x30011004 0x0054-0x005C Reserved - - - 0x0060-0x00E0 Reserved - - - 0x00E4 Write Protection Mode Register US_WPMR Read/Write 0x0 0x00E8 Write Protection Status Register US_WPSR Read-only 0x0 0x00EC-0x00FC Reserved - - - 0x0100-0x0128 Reserved for PDC Registers - - - 0x002C-0x003C 814 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.1 USART Control Register Name: US_CR Address: 0x40024000 (0), 0x40028000 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 RTSDIS 18 RTSEN 17 DTRDIS 16 DTREN 15 RETTO 14 RSTNACK 13 RSTIT 12 SENDA 11 STTTO 10 STPBRK 9 STTBRK 8 RSTSTA 7 TXDIS 6 TXEN 5 RXDIS 4 RXEN 3 RSTTX 2 RSTRX 1 - 0 - For SPI control, see Section 36.7.2 "USART Control Register (SPI_MODE)". * RSTRX: Reset Receiver 0: No effect. 1: Resets the receiver. * RSTTX: Reset Transmitter 0: No effect. 1: Resets the transmitter. * RXEN: Receiver Enable 0: No effect. 1: Enables the receiver, if RXDIS is 0. * RXDIS: Receiver Disable 0: No effect. 1: Disables the receiver. * TXEN: Transmitter Enable 0: No effect. 1: Enables the transmitter if TXDIS is 0. * TXDIS: Transmitter Disable 0: No effect. 1: Disables the transmitter. * RSTSTA: Reset Status Bits 0: No effect. 1: Resets the status bits PARE, FRAME, OVRE, MANERR and RXBRK in US_CSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 815 * STTBRK: Start Break 0: No effect. 1: Starts transmission of a break after the characters present in US_THR and the Transmit Shift Register have been transmitted. No effect if a break is already being transmitted. * STPBRK: Stop Break 0: No effect. 1: Stops transmission of the break after a minimum of one character length and transmits a high level during 12-bit periods. No effect if no break is being transmitted. * STTTO: Clear TIMEOUT Flag and Start Time-out After Next Character Received 0: No effect. 1: Starts waiting for a character before enabling the time-out counter. Immediately disables a time-out period in progress. Resets the status bit TIMEOUT in US_CSR. * SENDA: Send Address 0: No effect. 1: In Multidrop mode only, the next character written to the US_THR is sent with the address bit set. * RSTIT: Reset Iterations 0: No effect. 1: Resets ITER in US_CSR. No effect if the ISO7816 is not enabled. * RSTNACK: Reset Non Acknowledge 0: No effect 1: Resets NACK in US_CSR. * RETTO: Start Time-out Immediately 0: No effect 1: Immediately restarts time-out period. * DTREN: Data Terminal Ready Enable 0: No effect. 1: Drives the pin DTR to 0. * DTRDIS: Data Terminal Ready Disable 0: No effect. 1: Drives the pin DTR to 1. * RTSEN: Request to Send Pin Control 0: No effect. 1: Drives RTS pin to 0 if US_MR.USART_MODE field = 0. * RTSDIS: Request to Send Pin Control 0: No effect. 1: Drives RTS pin to 1 if US_MR.USART_MODE field = 0. 816 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.2 USART Control Register (SPI_MODE) Name: US_CR (SPI_MODE) Address: 0x40024000 (0), 0x40028000 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 RCS 18 FCS 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 RSTSTA 7 TXDIS 6 TXEN 5 RXDIS 4 RXEN 3 RSTTX 2 RSTRX 1 - 0 - This configuration is relevant only if USART_MODE = 0xE or 0xF in the USART Mode Register. * RSTRX: Reset Receiver 0: No effect. 1: Resets the receiver. * RSTTX: Reset Transmitter 0: No effect. 1: Resets the transmitter. * RXEN: Receiver Enable 0: No effect. 1: Enables the receiver, if RXDIS is 0. * RXDIS: Receiver Disable 0: No effect. 1: Disables the receiver. * TXEN: Transmitter Enable 0: No effect. 1: Enables the transmitter if TXDIS is 0. * TXDIS: Transmitter Disable 0: No effect. 1: Disables the transmitter. * RSTSTA: Reset Status Bits 0: No effect. 1: Resets the status bits OVRE, UNRE in US_CSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 817 * FCS: Force SPI Chip Select Applicable if USART operates in SPI master mode (USART_MODE = 0xE): 0: No effect. 1: Forces the Slave Select Line NSS (RTS pin) to 0, even if USART is not transmitting, in order to address SPI slave devices supporting the CSAAT mode (Chip Select Active After Transfer). * RCS: Release SPI Chip Select Applicable if USART operates in SPI master mode (USART_MODE = 0xE): 0: No effect. 1: Releases the Slave Select Line NSS (RTS pin). 818 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.3 USART Mode Register Name: US_MR Address: 0x40024004 (0), 0x40028004 (1) Access: Read/Write 31 ONEBIT 30 MODSYNC 29 MAN 28 FILTER 27 - 26 25 MAX_ITERATION 24 23 INVDATA 22 VAR_SYNC 21 DSNACK 20 INACK 19 OVER 18 CLKO 17 MODE9 16 MSBF 15 14 13 12 11 10 PAR 9 8 SYNC 4 3 2 1 0 CHMODE 7 NBSTOP 6 5 CHRL USCLKS USART_MODE This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. For SPI configuration, see Section 36.7.4 "USART Mode Register (SPI_MODE)". * USART_MODE: USART Mode of Operation Value Name Description 0x0 NORMAL Normal mode 0x1 RS485 0x2 HW_HANDSHAKING 0x3 MODEM 0x4 IS07816_T_0 IS07816 Protocol: T = 0 0x6 IS07816_T_1 IS07816 Protocol: T = 1 0x8 IRDA 0xE SPI_MASTER SPI master 0xF SPI_SLAVE SPI Slave RS485 Hardware Handshaking Modem IrDA The PDC transfers are supported in all USART modes of operation. * USCLKS: Clock Selection Value Name Description 0 MCK Peripheral clock is selected 1 DIV Peripheral clock divided (DIV=8) is selected 2 -- 3 SCK Reserved Serial clock (SCK) is selected SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 819 * CHRL: Character Length Value Name Description 0 5_BIT Character length is 5 bits 1 6_BIT Character length is 6 bits 2 7_BIT Character length is 7 bits 3 8_BIT Character length is 8 bits * SYNC: Synchronous Mode Select 0: USART operates in Asynchronous mode. 1: USART operates in Synchronous mode. * PAR: Parity Type Value Name Description 0 EVEN Even parity 1 ODD Odd parity 2 SPACE Parity forced to 0 (Space) 3 MARK Parity forced to 1 (Mark) 4 NO 6 MULTIDROP No parity Multidrop mode * NBSTOP: Number of Stop Bits Value Name Description 0 1_BIT 1 stop bit 1 1_5_BIT 2 2_BIT 1.5 stop bit (SYNC = 0) or reserved (SYNC = 1) 2 stop bits * CHMODE: Channel Mode Value Name Description 0 NORMAL Normal mode 1 AUTOMATIC 2 LOCAL_LOOPBACK 3 REMOTE_LOOPBACK * MSBF: Bit Order 0: Least significant bit is sent/received first. 1: Most significant bit is sent/received first. * MODE9: 9-bit Character Length 0: CHRL defines character length 1: 9-bit character length 820 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Automatic Echo. Receiver input is connected to the TXD pin. Local Loopback. Transmitter output is connected to the Receiver Input. Remote Loopback. RXD pin is internally connected to the TXD pin. * CLKO: Clock Output Select 0: The USART does not drive the SCK pin. 1: The USART drives the SCK pin if USCLKS does not select the external clock SCK. * OVER: Oversampling Mode 0: 16 x Oversampling 1: 8 x Oversampling * INACK: Inhibit Non Acknowledge 0: The NACK is generated. 1: The NACK is not generated. * DSNACK: Disable Successive NACK 0: NACK is sent on the ISO line as soon as a parity error occurs in the received character (unless INACK is set). 1: Successive parity errors are counted up to the value specified in the MAX_ITERATION field. These parity errors generate a NACK on the ISO line. As soon as this value is reached, no additional NACK is sent on the ISO line. The flag ITER is asserted. Note: MAX_ITERATION field must be set to 0 if DSNACK is cleared. * INVDATA: Inverted Data 0: The data field transmitted on TXD line is the same as the one written in US_THR or the content read in US_RHR is the same as RXD line. Normal mode of operation. 1: The data field transmitted on TXD line is inverted (voltage polarity only) compared to the value written on US_THR or the content read in US_RHR is inverted compared to what is received on RXD line (or ISO7816 IO line). Inverted mode of operation, useful for contactless card application. To be used with configuration bit MSBF. * VAR_SYNC: Variable Synchronization of Command/Data Sync Start Frame Delimiter 0: User defined configuration of command or data sync field depending on MODSYNC value. 1: The sync field is updated when a character is written into US_THR. * MAX_ITERATION: Maximum Number of Automatic Iteration 0-7: Defines the maximum number of iterations in mode ISO7816, protocol T = 0. * FILTER: Receive Line Filter 0: The USART does not filter the receive line. 1: The USART filters the receive line using a three-sample filter (1/16-bit clock) (2 over 3 majority). * MAN: Manchester Encoder/Decoder Enable 0: Manchester encoder/decoder are disabled. 1: Manchester encoder/decoder are enabled. * MODSYNC: Manchester Synchronization Mode 0:The Manchester start bit is a 0 to 1 transition 1: The Manchester start bit is a 1 to 0 transition. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 821 * ONEBIT: Start Frame Delimiter Selector 0: Start frame delimiter is COMMAND or DATA SYNC. 1: Start frame delimiter is one bit. 822 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.4 USART Mode Register (SPI_MODE) Name: US_MR (SPI_MODE) Address: 0x40024004 (0), 0x40028004 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 WRDBT 19 - 18 CLKO 17 - 16 CPOL 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 CPHA 6 5 4 3 2 1 0 7 CHRL USCLKS USART_MODE This configuration is relevant only if USART_MODE = 0xE or 0xF in the USART Mode Register. This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. * USART_MODE: USART Mode of Operation Value Name Description 0xE SPI_MASTER SPI master 0xF SPI_SLAVE SPI Slave * USCLKS: Clock Selection Value Name Description 0 MCK Peripheral clock is selected 1 DIV Peripheral clock divided (DIV=8) is selected 3 SCK Serial Clock SLK is selected * CHRL: Character Length Value Name Description 3 8_BIT Character length is 8 bits * CPHA: SPI Clock Phase - Applicable if USART operates in SPI mode (USART_MODE = 0xE or 0xF): 0: Data is changed on the leading edge of SPCK and captured on the following edge of SPCK. 1: Data is captured on the leading edge of SPCK and changed on the following edge of SPCK. CPHA determines which edge of SPCK causes data to change and which edge causes data to be captured. CPHA is used with CPOL to produce the required clock/data relationship between master and slave devices. * CPOL: SPI Clock Polarity Applicable if USART operates in SPI mode (slave or master, USART_MODE = 0xE or 0xF): 0: The inactive state value of SPCK is logic level zero. 1: The inactive state value of SPCK is logic level one. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 823 CPOL is used to determine the inactive state value of the serial clock (SPCK). It is used with CPHA to produce the required clock/data relationship between master and slave devices. * CLKO: Clock Output Select 0: The USART does not drive the SCK pin. 1: The USART drives the SCK pin if USCLKS does not select the external clock SCK. * WRDBT: Wait Read Data Before Transfer 0: The character transmission starts as soon as a character is written into US_THR (assuming TXRDY was set). 1: The character transmission starts when a character is written and only if RXRDY flag is cleared (Receive Holding Register has been read). 824 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.5 USART Interrupt Enable Register Name: US_IER Address: 0x40024008 (0), 0x40028008 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 MANE 23 - 22 - 21 - 20 - 19 CTSIC 18 DCDIC 17 DSRIC 16 RIIC 15 - 14 - 13 NACK 12 RXBUFF 11 TXBUFE 10 ITER 9 TXEMPTY 8 TIMEOUT 7 PARE 6 FRAME 5 OVRE 4 ENDTX 3 ENDRX 2 RXBRK 1 TXRDY 0 RXRDY For SPI specific configuration, see Section 36.7.6 "USART Interrupt Enable Register (SPI_MODE)". The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Enables the corresponding interrupt. * RXRDY: RXRDY Interrupt Enable * TXRDY: TXRDY Interrupt Enable * RXBRK: Receiver Break Interrupt Enable * ENDRX: End of Receive Buffer Interrupt Enable (available in all USART modes of operation) * ENDTX: End of Transmit Buffer Interrupt Enable (available in all USART modes of operation) * OVRE: Overrun Error Interrupt Enable * FRAME: Framing Error Interrupt Enable * PARE: Parity Error Interrupt Enable * TIMEOUT: Time-out Interrupt Enable * TXEMPTY: TXEMPTY Interrupt Enable * ITER: Max number of Repetitions Reached Interrupt Enable * TXBUFE: Transmit Buffer Empty Interrupt Enable (available in all USART modes of operation) * RXBUFF: Receive Buffer Full Interrupt Enable (available in all USART modes of operation) * NACK: Non Acknowledge Interrupt Enable * RIIC: Ring Indicator Input Change Enable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 825 * DSRIC: Data Set Ready Input Change Enable * DCDIC: Data Carrier Detect Input Change Interrupt Enable * CTSIC: Clear to Send Input Change Interrupt Enable * MANE: Manchester Error Interrupt Enable 826 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.6 USART Interrupt Enable Register (SPI_MODE) Name: US_IER (SPI_MODE) Address: 0x40024008 (0), 0x40028008 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 RXBUFF 11 TXBUFE 10 UNRE 9 TXEMPTY 8 - 7 - 6 - 5 OVRE 4 ENDTX 3 ENDRX 2 - 1 TXRDY 0 RXRDY This configuration is relevant only if USART_MODE = 0xE or 0xF in the USART Mode Register. The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Enables the corresponding interrupt. * RXRDY: RXRDY Interrupt Enable * TXRDY: TXRDY Interrupt Enable * ENDRX: End of Receive Buffer Interrupt Enable * ENDTX: End of Transmit Buffer Interrupt Enable * OVRE: Overrun Error Interrupt Enable * TXEMPTY: TXEMPTY Interrupt Enable * UNRE: SPI Underrun Error Interrupt Enable * TXBUFE: Transmit Buffer Empty Interrupt Enable * RXBUFF: Receive Buffer Full Interrupt Enable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 827 36.7.7 USART Interrupt Disable Register Name: US_IDR Address: 0x4002400C (0), 0x4002800C (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 MANE 23 - 22 - 21 - 20 - 19 CTSIC 18 DCDIC 17 DSRIC 16 RIIC 15 - 14 - 13 NACK 12 RXBUFF 11 TXBUFE 10 ITER 9 TXEMPTY 8 TIMEOUT 7 PARE 6 FRAME 5 OVRE 4 ENDTX 3 ENDRX 2 RXBRK 1 TXRDY 0 RXRDY For SPI specific configuration, see Section 36.7.8 "USART Interrupt Disable Register (SPI_MODE)". The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Disables the corresponding interrupt. * RXRDY: RXRDY Interrupt Disable * TXRDY: TXRDY Interrupt Disable * RXBRK: Receiver Break Interrupt Disable * ENDRX: End of Receive Buffer Transfer Interrupt Disable (available in all USART modes of operation) * ENDTX: End of Transmit Buffer Interrupt Disable (available in all USART modes of operation) * OVRE: Overrun Error Interrupt Enable * FRAME: Framing Error Interrupt Disable * PARE: Parity Error Interrupt Disable * TIMEOUT: Time-out Interrupt Disable * TXEMPTY: TXEMPTY Interrupt Disable * ITER: Max Number of Repetitions Reached Interrupt Disable * TXBUFE: Transmit Buffer Empty Interrupt Disable (available in all USART modes of operation) * RXBUFF: Receive Buffer Full Interrupt Disable (available in all USART modes of operation) * NACK: Non Acknowledge Interrupt Disable * RIIC: Ring Indicator Input Change Disable 828 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * DSRIC: Data Set Ready Input Change Disable * DCDIC: Data Carrier Detect Input Change Interrupt Disable * CTSIC: Clear to Send Input Change Interrupt Disable * MANE: Manchester Error Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 829 36.7.8 USART Interrupt Disable Register (SPI_MODE) Name: US_IDR (SPI_MODE) Address: 0x4002400C (0), 0x4002800C (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 RXBUFF 11 TXBUFE 10 UNRE 9 TXEMPTY 8 - 7 - 6 - 5 OVRE 4 ENDTX 3 ENDRX 2 - 1 TXRDY 0 RXRDY This configuration is relevant only if USART_MODE = 0xE or 0xF in the USART Mode Register. The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Disables the corresponding interrupt. * RXRDY: RXRDY Interrupt Disable * TXRDY: TXRDY Interrupt Disable * ENDRX: End of Receive Buffer Transfer Interrupt Disable * ENDTX: End of Transmit Buffer Interrupt Disable * OVRE: Overrun Error Interrupt Disable * TXEMPTY: TXEMPTY Interrupt Disable * UNRE: SPI Underrun Error Interrupt Disable * TXBUFE: Transmit Buffer Empty Interrupt Disable * RXBUFF: Receive Buffer Full Interrupt Disable 830 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.9 USART Interrupt Mask Register Name: US_IMR Address: 0x40024010 (0), 0x40028010 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 MANE 23 - 22 - 21 - 20 - 19 CTSIC 18 DCDIC 17 DSRIC 16 RIIC 15 - 14 - 13 NACK 12 RXBUFF 11 TXBUFE 10 ITER 9 TXEMPTY 8 TIMEOUT 7 PARE 6 FRAME 5 OVRE 4 ENDTX 3 ENDRX 2 RXBRK 1 TXRDY 0 RXRDY For SPI specific configuration, see Section 36.7.10 "USART Interrupt Mask Register (SPI_MODE)". The following configuration values are valid for all listed bit names of this register: 0: The corresponding interrupt is not enabled. 1: The corresponding interrupt is enabled. * RXRDY: RXRDY Interrupt Mask * TXRDY: TXRDY Interrupt Mask * RXBRK: Receiver Break Interrupt Mask * ENDRX: End of Receive Buffer Interrupt Mask (available in all USART modes of operation) * ENDTX: End of Transmit Buffer Interrupt Mask (available in all USART modes of operation) * OVRE: Overrun Error Interrupt Mask * FRAME: Framing Error Interrupt Mask * PARE: Parity Error Interrupt Mask * TIMEOUT: Time-out Interrupt Mask * TXEMPTY: TXEMPTY Interrupt Mask * ITER: Max Number of Repetitions Reached Interrupt Mask * TXBUFE: Transmit Buffer Empty Interrupt Mask (available in all USART modes of operation) * RXBUFF: Receive Buffer Full Interrupt Mask (available in all USART modes of operation) * NACK: Non Acknowledge Interrupt Mask * RIIC: Ring Indicator Input Change Mask SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 831 * DSRIC: Data Set Ready Input Change Mask * DCDIC: Data Carrier Detect Input Change Interrupt Mask * CTSIC: Clear to Send Input Change Interrupt Mask * MANE: Manchester Error Interrupt Mask 832 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.10 USART Interrupt Mask Register (SPI_MODE) Name: US_IMR (SPI_MODE) Address: 0x40024010 (0), 0x40028010 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 RXBUFF 11 TXBUFE 10 UNRE 9 TXEMPTY 8 - 7 - 6 - 5 OVRE 4 ENDTX 3 ENDRX 2 - 1 TXRDY 0 RXRDY This configuration is relevant only if USART_MODE = 0xE or 0xF in the USART Mode Register. The following configuration values are valid for all listed bit names of this register: 0: The corresponding interrupt is not enabled. 1: The corresponding interrupt is enabled. * RXRDY: RXRDY Interrupt Mask * TXRDY: TXRDY Interrupt Mask * ENDRX: End of Receive Buffer Interrupt Mask * ENDTX: End of Transmit Buffer Interrupt Mask * OVRE: Overrun Error Interrupt Mask * TXEMPTY: TXEMPTY Interrupt Mask * UNRE: SPI Underrun Error Interrupt Mask * TXBUFE: Transmit Buffer Empty Interrupt Mask * RXBUFF: Receive Buffer Full Interrupt Mask SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 833 36.7.11 USART Channel Status Register Name: US_CSR Address: 0x40024014 (0), 0x40028014 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 MANERR 23 CTS 22 DCD 21 DSR 20 RI 19 CTSIC 18 DCDIC 17 DSRIC 16 RIIC 15 - 14 - 13 NACK 12 RXBUFF 11 TXBUFE 10 ITER 9 TXEMPTY 8 TIMEOUT 7 PARE 6 FRAME 5 OVRE 4 ENDTX 3 ENDRX 2 RXBRK 1 TXRDY 0 RXRDY For SPI specific configuration, see Section 36.7.12 "USART Channel Status Register (SPI_MODE)". * RXRDY: Receiver Ready (cleared by reading US_RHR) 0: No complete character has been received since the last read of US_RHR or the receiver is disabled. If characters were being received when the receiver was disabled, RXRDY changes to 1 when the receiver is enabled. 1: At least one complete character has been received and US_RHR has not yet been read. * TXRDY: Transmitter Ready (cleared by writing US_THR) 0: A character is in the US_THR waiting to be transferred to the Transmit Shift Register, or an STTBRK command has been requested, or the transmitter is disabled. As soon as the trTable 36-15 "Register Mapping"ansmitter is enabled, TXRDY becomes 1. 1: There is no character in the US_THR. * RXBRK: Break Received/End of Break (cleared by writing a one to bit US_CR.RSTSTA) 0: No break received or end of break detected since the last RSTSTA. 1: Break received or end of break detected since the last RSTSTA. * ENDRX: End of RX Buffer (cleared by writing US_RCR or US_RNCR) 0: The Receive Counter Register has not reached 0 since the last write in US_RCR or US_RNCR(1). 1: The Receive Counter Register has reached 0 since the last write in US_RCR or US_RNCR(1). * ENDTX: End of TX Buffer (cleared by writing US_TCR or US_TNCR) 0: The Transmit Counter Register has not reached 0 since the last write in US_TCR or US_TNCR(1). 1: The Transmit Counter Register has reached 0 since the last write in US_TCR or US_TNCR(1). * OVRE: Overrun Error (cleared by writing a one to bit US_CR.RSTSTA) 0: No overrun error has occurred since the last RSTSTA. 1: At least one overrun error has occurred since the last RSTSTA. 834 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * FRAME: Framing Error (cleared by writing a one to bit US_CR.RSTSTA) 0: No stop bit has been detected low since the last RSTSTA. 1: At least one stop bit has been detected low since the last RSTSTA. * PARE: Parity Error (cleared by writing a one to bit US_CR.RSTSTA) 0: No parity error has been detected since the last RSTSTA. 1: At least one parity error has been detected since the last RSTSTA. * TIMEOUT: Receiver Time-out (cleared by writing a one to bit US_CR.STTTO) 0: There has not been a time-out since the last Start Time-out command (STTTO in US_CR) or the Time-out Register is 0. 1: There has been a time-out since the last Start Time-out command (STTTO in US_CR). * TXEMPTY: Transmitter Empty (cleared by writing US_THR) 0: There are characters in either US_THR or the Transmit Shift Register, or the transmitter is disabled. 1: There are no characters in US_THR, nor in the Transmit Shift Register. * ITER: Max Number of Repetitions Reached (cleared by writing a one to bit US_CR.RSTIT) 0: Maximum number of repetitions has not been reached since the last RSTIT. 1: Maximum number of repetitions has been reached since the last RSTIT. * TXBUFE: TX Buffer Empty (cleared by writing US_TCR or US_TNCR) 0: US_TCR or US_TNCR have a value other than 0(1). 1: Both US_TCR and US_TNCR have a value of 0(1). * RXBUFF: RX Buffer Full (cleared by writing US_RCR or US_RNCR) 0: US_RCR or US_RNCR have a value other than 0(1). 1: Both US_RCR and US_RNCR have a value of 0(1). Note: 1. US_RCR, US_RNCR, US_TCR and US_TNCR are PDC registers. * NACK: Non Acknowledge Interrupt (cleared by writing a one to bit US_CR.RSTNACK) 0: Non acknowledge has not been detected since the last RSTNACK. 1: At least one non acknowledge has been detected since the last RSTNACK. * RIIC: Ring Indicator Input Change Flag (cleared on read) 0: No input change has been detected on the RI pin since the last read of US_CSR. 1: At least one input change has been detected on the RI pin since the last read of US_CSR. * DSRIC: Data Set Ready Input Change Flag (cleared on read) 0: No input change has been detected on the DSR pin since the last read of US_CSR. 1: At least one input change has been detected on the DSR pin since the last read of US_CSR. * DCDIC: Data Carrier Detect Input Change Flag (cleared on read) 0: No input change has been detected on the DCD pin since the last read of US_CSR. 1: At least one input change has been detected on the DCD pin since the last read of US_CSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 835 * CTSIC: Clear to Send Input Change Flag (cleared on read) 0: No input change has been detected on the CTS pin since the last read of US_CSR. 1: At least one input change has been detected on the CTS pin since the last read of US_CSR. * RI: Image of RI Input 0: RI input is driven low. 1: RI input is driven high. * DSR: Image of DSR Input 0: DSR input is driven low. 1: DSR input is driven high. * DCD: Image of DCD Input 0: DCD input is driven low. 1: DCD input is driven high. * CTS: Image of CTS Input 0: CTS input is driven low. 1: CTS input is driven high. * MANERR: Manchester Error (cleared by writing a one to the bit US_CR.RSTSTA) 0: No Manchester error has been detected since the last RSTSTA. 1: At least one Manchester error has been detected since the last RSTSTA. 836 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.12 USART Channel Status Register (SPI_MODE) Name: US_CSR (SPI_MODE) Address: 0x40024014 (0), 0x40028014 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 RXBUFF 11 TXBUFE 10 UNRE 9 TXEMPTY 8 - 7 - 6 - 5 OVRE 4 ENDTX 3 ENDRX 2 - 1 TXRDY 0 RXRDY This configuration is relevant only if USART_MODE = 0xE or 0xF in the USART Mode Register. * RXRDY: Receiver Ready (cleared by reading US_RHR) 0: No complete character has been received since the last read of US_RHR or the receiver is disabled. If characters were being received when the receiver was disabled, RXRDY changes to 1 when the receiver is enabled. 1: At least one complete character has been received and US_RHR has not yet been read. * TXRDY: Transmitter Ready (cleared by writing US_THR) 0: A character is in the US_THR waiting to be transferred to the Transmit Shift Register or the transmitter is disabled. As soon as the transmitter is enabled, TXRDY becomes 1. 1: There is no character in the US_THR. * ENDRX: End of RX Buffer (cleared by writing US_RCR or US_RNCR) 0: The Receive Counter Register has not reached 0 since the last write in US_RCR or US_RNCR(1). 1: The Receive Counter Register has reached 0 since the last write in US_RCR or US_RNCR(1). * ENDTX: End of TX Buffer (cleared by writing US_TCR or US_TNCR) 0: The Transmit Counter Register has not reached 0 since the last write in US_TCR or US_TNCR(1). 1: The Transmit Counter Register has reached 0 since the last write in US_TCR or US_TNCR(1). * OVRE: Overrun Error (cleared by writing a one to bit US_CR.RSTSTA) 0: No overrun error has occurred since the last RSTSTA. 1: At least one overrun error has occurred since the last RSTSTA. * TXEMPTY: Transmitter Empty (cleared by writing US_THR) 0: There are characters in either US_THR or the Transmit Shift Register, or the transmitter is disabled. 1: There are no characters in US_THR, nor in the Transmit Shift Register. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 837 * UNRE: Underrun Error (cleared by writing a one to bit US_CR.RSTSTA) 0: No SPI underrun error has occurred since the last RSTSTA. 1: At least one SPI underrun error has occurred since the last RSTSTA. * TXBUFE: TX Buffer Empty (cleared by writing US_TCR or US_TNCR) 0: US_TCR or US_TNCR have a value other than 0(1). 1: Both US_TCR and US_TNCR have a value of 0(1). * RXBUFF: RX Buffer Full (cleared by writing US_RCR or US_RNCR) 0: US_RCR or US_RNCR have a value other than 0(1). 1: Both US_RCR and US_RNCR have a value of 0(1). Note: 838 1. US_RCR, US_RNCR, US_TCR and US_TNCR are PDC registers. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.13 USART Receive Holding Register Name: US_RHR Address: 0x40024018 (0), 0x40028018 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 RXSYNH 14 - 13 - 12 - 11 - 10 - 9 - 8 RXCHR 7 6 5 4 3 2 1 0 RXCHR * RXCHR: Received Character Last character received if RXRDY is set. * RXSYNH: Received Sync 0: Last character received is a data. 1: Last character received is a command. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 839 36.7.14 USART Transmit Holding Register Name: US_THR Address: 0x4002401C (0), 0x4002801C (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 TXSYNH 14 - 13 - 12 - 11 - 10 - 9 - 8 TXCHR 7 6 5 4 3 2 1 0 TXCHR * TXCHR: Character to be Transmitted Next character to be transmitted after the current character if TXRDY is not set. * TXSYNH: Sync Field to be Transmitted 0: The next character sent is encoded as a data. Start frame delimiter is DATA SYNC. 1: The next character sent is encoded as a command. Start frame delimiter is COMMAND SYNC. 840 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.15 USART Baud Rate Generator Register Name: US_BRGR Address: 0x40024020 (0), 0x40028020 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 17 FP 16 15 14 13 12 11 10 9 8 3 2 1 0 CD 7 6 5 4 CD This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. * CD: Clock Divider USART_MODE ISO7816 SYNC = 0 CD OVER = 0 OVER = 1 0 1 to 65535 SYNC = 1 or USART_MODE = SPI (Master or Slave) USART_MODE = ISO7816 Baud Rate Clock Disabled CD = Selected Clock / (16 x Baud Rate) CD = Selected Clock / (8 x Baud Rate) CD = Selected Clock / Baud Rate CD = Selected Clock / (FI_DI_RATIO x Baud Rate) * FP: Fractional Part 0: Fractional divider is disabled. 1-7: Baud rate resolution, defined by FP x 1/8. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 841 36.7.16 USART Receiver Time-out Register Name: US_RTOR Address: 0x40024024 (0), 0x40028024 (1) Access: Read/Write 31 30 29 28 27 26 25 24 - - - - - - - - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 2 1 0 TO 7 6 5 4 TO This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. * TO: Time-out Value 0: The receiver time-out is disabled. 1-65535: The receiver time-out is enabled and TO is Time-out Delay / Bit Period. 842 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.17 USART Transmitter Timeguard Register Name: US_TTGR Address: 0x40024028 (0), 0x40028028 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 6 5 4 3 2 1 0 TG This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. * TG: Timeguard Value 0: The transmitter timeguard is disabled. 1-255: The transmitter timeguard is enabled and TG is Timeguard Delay / Bit Period. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 843 36.7.18 USART FI DI RATIO Register Name: US_FIDI Address: 0x40024040 (0), 0x40028040 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 9 FI_DI_RATIO 8 7 6 5 4 3 2 1 0 FI_DI_RATIO This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. * FI_DI_RATIO: FI Over DI Ratio Value 0: If ISO7816 mode is selected, the baud rate generator generates no signal. 1-2: Do not use. 3-2047: If ISO7816 mode is selected, the baud rate is the clock provided on SCK divided by FI_DI_RATIO. 844 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.19 USART Number of Errors Register Name: US_NER Address: 0x40024044 (0), 0x40028044 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 6 5 4 3 2 1 0 NB_ERRORS This register is relevant only if USART_MODE = 0x4 or 0x6 in the USART Mode Register. * NB_ERRORS: Number of Errors Total number of errors that occurred during an ISO7816 transfer. This register automatically clears when read. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 845 36.7.20 USART IrDA Filter Register Name: US_IF Address: 0x4002404C (0), 0x4002804C (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 6 5 4 3 2 1 0 IRDA_FILTER This register is relevant only if USART_MODE = 0x8 in the USART Mode Register. This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. * IRDA_FILTER: IrDA Filter The IRDA_FILTER value must be defined to meet the following criteria: tperipheral clock x (IRDA_FILTER + 3) < 1.41 s 846 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.21 USART Manchester Configuration Register Name: US_MAN Address: 0x40024050 (0), 0x40028050 (1) Access: Read/Write 31 - 30 DRIFT 29 ONE 28 RX_MPOL 27 - 26 - 25 23 - 22 - 21 - 20 - 19 18 17 15 - 14 - 13 - 12 TX_MPOL 11 - 10 - 9 7 - 6 - 5 - 4 - 3 2 1 24 RX_PP 16 RX_PL 8 TX_PP 0 TX_PL This register can only be written if the WPEN bit is cleared in the USART Write Protection Mode Register. * TX_PL: Transmitter Preamble Length 0: The transmitter preamble pattern generation is disabled 1-15: The preamble length is TX_PL x Bit Period * TX_PP: Transmitter Preamble Pattern The following values assume that TX_MPOL field is not set: Value Name Description 0 ALL_ONE The preamble is composed of `1's 1 ALL_ZERO The preamble is composed of `0's 2 ZERO_ONE The preamble is composed of `01's 3 ONE_ZERO The preamble is composed of `10's * TX_MPOL: Transmitter Manchester Polarity 0: Logic zero is coded as a zero-to-one transition, Logic one is coded as a one-to-zero transition. 1: Logic zero is coded as a one-to-zero transition, Logic one is coded as a zero-to-one transition. * RX_PL: Receiver Preamble Length 0: The receiver preamble pattern detection is disabled 1-15: The detected preamble length is RX_PL x Bit Period SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 847 * RX_PP: Receiver Preamble Pattern detected The following values assume that RX_MPOL field is not set: Value Name Description 00 ALL_ONE The preamble is composed of `1's 01 ALL_ZERO The preamble is composed of `0's 10 ZERO_ONE The preamble is composed of `01's 11 ONE_ZERO The preamble is composed of `10's * RX_MPOL: Receiver Manchester Polarity 0: Logic zero is coded as a zero-to-one transition, Logic one is coded as a one-to-zero transition. 1: Logic zero is coded as a one-to-zero transition, Logic one is coded as a zero-to-one transition. * ONE: Must Be Set to 1 Bit 29 must always be set to 1 when programming the US_MAN register. * DRIFT: Drift Compensation 0: The USART cannot recover from an important clock drift 1: The USART can recover from clock drift. The 16X clock mode must be enabled. 848 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 36.7.22 USART Write Protection Mode Register Name: US_WPMR Address: 0x400240E4 (0), 0x400280E4 (1) Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x555341 ("USA" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x555341 ("USA" in ASCII). See Section 36.6.10 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protection Key Value Name 0x555341 PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 849 36.7.23 USART Write Protection Status Register Name: US_WPSR Address: 0x400240E8 (0), 0x400280E8 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPVS WPVSRC 15 14 13 12 WPVSRC 7 - 6 - 5 - 4 - * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the US_WPSR. 1: A write protection violation has occurred since the last read of the US_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. 850 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37. Timer Counter (TC) 37.1 Description A Timer Counter (TC) module includes three identical TC channels. The number of implemented TC modules is device-specific. Each TC channel can be independently programmed to perform a wide range of functions including frequency measurement, event counting, interval measurement, pulse generation, delay timing and pulse width modulation. Each channel has three external clock inputs, five internal clock inputs and two multi-purpose input/output signals which can be configured by the user. Each channel drives an internal interrupt signal which can be programmed to generate processor interrupts. The TC embeds a quadrature decoder (QDEC) connected in front of the timers and driven by TIOA0, TIOB0 and TIOB1 inputs. When enabled, the QDEC performs the input lines filtering, decoding of quadrature signals and connects to the timers/counters in order to read the position and speed of the motor through the user interface. The TC block has two global registers which act upon all TC channels: 37.2 Block Control Register (TC_BCR)--allows channels to be started simultaneously with the same instruction Block Mode Register (TC_BMR)--defines the external clock inputs for each channel, allowing them to be chained Embedded Characteristics Total number of TC channels: 6 TC channel size: 16-bit Wide range of functions including: Frequency measurement Event counting Interval measurement Pulse generation Delay timing Pulse Width Modulation Up/down capabilities Quadrature decoder 2-bit gray up/down count for stepper motor Each channel is user-configurable and contains: Three external clock inputs Five Internal clock inputs Two multi-purpose input/output signals acting as trigger event Internal interrupt signal Compare event fault generation for PWM Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 851 37.3 Block Diagram Table 37-1. Timer Counter Clock Assignment Name Definition TIMER_CLOCK1 MCK/2 TIMER_CLOCK2 MCK/8 TIMER_CLOCK3 MCK/32 TIMER_CLOCK4 MCK/128 TIMER_CLOCK5 SLCK Note: Figure 37-1. 1. When SLCK is selected for Peripheral Clock (CSS = 0 in PMC Master Clock Register), SLCK input is equivalent to Peripheral Clock. Timer Counter Block Diagram Parallel I/O Controller TIMER_CLOCK1 TCLK0 TIMER_CLOCK2 TIOA1 TIOA2 TIMER_CLOCK3 TCLK1 TIMER_CLOCK4 XC0 Timer/Counter Channel 0 XC1 TIOA TIOA0 TIOB0 TIOA0 TIOB TCLK2 TIOB0 XC2 TIMER_CLOCK5 TC0XC0S SYNC TCLK0 TCLK1 TCLK2 INT0 TCLK0 TCLK1 XC0 TIOA0 XC1 TIOA2 XC2 Timer/Counter Channel 1 TIOA TIOA1 TIOB1 TIOA1 TIOB TCLK2 TIOB1 SYNC TC1XC1S TCLK0 XC0 TCLK1 XC1 Timer/Counter Channel 2 INT1 TIOA TIOA2 TIOB2 TIOA2 TIOB TCLK2 XC2 TIOB2 TIOA0 TIOA1 SYNC TC2XC2S INT2 FAULT Timer Counter PWM Note: The QDEC connections are detailed in Figure 37-15. 852 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Interrupt Controller Table 37-2. Signal Description Block/Channel Signal Name Description XC0, XC1, XC2 Channel Signal External Clock Inputs TIOA Capture Mode: Timer Counter Input Waveform Mode: Timer Counter Output TIOB Capture Mode: Timer Counter Input Waveform Mode: Timer Counter Input/Output INT Interrupt Signal Output (internal signal) SYNC 37.4 Synchronization Input Signal (from configuration register) Pin List Table 37-3. Pin List Pin Name Description Type TCLK0-TCLK2 External Clock Input Input TIOA0-TIOA2 I/O Line A I/O TIOB0-TIOB2 I/O Line B I/O 37.5 Product Dependencies 37.5.1 I/O Lines The pins used for interfacing the compliant external devices may be multiplexed with PIO lines. The programmer must first program the PIO controllers to assign the TC pins to their peripheral functions. Table 37-4. I/O Lines Instance Signal I/O Line Peripheral TC0 TCLK0 PA4 B TC0 TCLK1 PA28 B TC0 TCLK2 PA29 B TC0 TIOA0 PA0 B TC0 TIOA1 PA15 B TC0 TIOA2 PA26 B TC0 TIOB0 PA1 B TC0 TIOB1 PA16 B TC0 TIOB2 PA27 B TC1 TCLK3 PC25 B TC1 TCLK4 PC28 B TC1 TCLK5 PC31 B TC1 TIOA3 PC23 B TC1 TIOA4 PC26 B TC1 TIOA5 PC29 B SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 853 Table 37-4. I/O Lines TC1 TIOB3 PC24 B TC1 TIOB4 PC27 B TC1 TIOB5 PC30 B 37.5.2 Power Management The TC is clocked through the Power Management Controller (PMC), thus the programmer must first configure the PMC to enable the Timer Counter clock of each channel. 37.5.3 Interrupt Sources The TC has an interrupt line per channel connected to the interrupt controller. Handling the TC interrupt requires programming the interrupt controller before configuring the TC. Table 37-5. Peripheral IDs Instance ID TC0 23 TC1 24 37.5.4 Fault Output The TC has the FAULT output internally connected to the fault input of PWM. Refer to Section 37.6.16 "Fault Mode" and to the implementation of the Pulse Width Modulation (PWM) in this product. 37.6 Functional Description 37.6.1 Description All channels of the Timer Counter are independent and identical in operation except when the QDEC is enabled. The registers for channel programming are listed in Table 37-6 "Register Mapping". 37.6.2 16-bit Counter Each 16-bit channel is organized around a 16-bit counter. The value of the counter is incremented at each positive edge of the selected clock. When the counter has reached the value 216-1 and passes to zero, an overflow occurs and the COVFS bit in the TC Status Register (TC_SR) is set. The current value of the counter is accessible in real time by reading the TC Counter Value Register (TC_CV). The counter can be reset by a trigger. In this case, the counter value passes to zero on the next valid edge of the selected clock. 37.6.3 Clock Selection At block level, input clock signals of each channel can either be connected to the external inputs TCLK0, TCLK1 or TCLK2, or be connected to the internal I/O signals TIOA0, TIOA1 or TIOA2 for chaining by programming the TC Block Mode Register (TC_BMR). See Figure 37-2. Each channel can independently select an internal or external clock source for its counter: External clock signals(1): XC0, XC1 or XC2 Internal clock signals: MCK/2, MCK/8, MCK/32, MCK/128, SLCK This selection is made by the TCCLKS bits in the TC Channel Mode Register (TC_CMR). 854 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The selected clock can be inverted with the CLKI bit in the TC_CMR. This allows counting on the opposite edges of the clock. The burst function allows the clock to be validated when an external signal is high. The BURST parameter in the TC_CMR defines this signal (none, XC0, XC1, XC2). See Figure 37-3. Note: 1. Figure 37-2. In all cases, if an external clock is used, the duration of each of its levels must be longer than the peripheral clock period. The external clock frequency must be at least 2.5 times lower than the peripheral clock. Clock Chaining Selection TC0XC0S Timer/Counter Channel 0 TCLK0 TIOA1 XC0 TIOA2 TIOA0 XC1 = TCLK1 TIOB0 XC2 = TCLK2 SYNC TC1XC1S Timer/Counter Channel 1 TCLK1 TIOA1 XC0 = TCLK0 TIOA0 XC1 TIOA2 XC2 = TCLK2 TIOB1 SYNC Timer/Counter Channel 2 TC2XC2S XC0 = TCLK0 TCLK2 TIOA2 XC1 = TCLK1 TIOA0 XC2 TIOB2 TIOA1 SYNC SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 855 Figure 37-3. Clock Selection TCCLKS CLKI TIMER_CLOCK1 Synchronous Edge Detection TIMER_CLOCK2 TIMER_CLOCK3 Selected Clock TIMER_CLOCK4 TIMER_CLOCK5 XC0 XC1 XC2 Peripheral Clock BURST 1 37.6.4 Clock Control The clock of each counter can be controlled in two different ways: it can be enabled/disabled and started/stopped. See Figure 37-4. 856 The clock can be enabled or disabled by the user with the CLKEN and the CLKDIS commands in the TC Channel Control Register (TC_CCR). In Capture mode it can be disabled by an RB load event if LDBDIS is set to 1 in the TC_CMR. In Waveform mode, it can be disabled by an RC Compare event if CPCDIS is set to 1 in TC_CMR. When disabled, the start or the stop actions have no effect: only a CLKEN command in the TC_CCR can re-enable the clock. When the clock is enabled, the CLKSTA bit is set in the TC_SR. The clock can also be started or stopped: a trigger (software, synchro, external or compare) always starts the clock. The clock can be stopped by an RB load event in Capture mode (LDBSTOP = 1 in TC_CMR) or an RC compare event in Waveform mode (CPCSTOP = 1 in TC_CMR). The start and the stop commands are effective only if the clock is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 37-4. Clock Control Selected Clock Trigger CLKSTA Q Q S CLKEN CLKDIS S R R Counter Clock Stop Event Disable Event 37.6.5 Operating Modes Each channel can operate independently in two different modes: Capture mode provides measurement on signals. Waveform mode provides wave generation. The TC operating mode is programmed with the WAVE bit in the TC_CMR. In Capture mode, TIOA and TIOB are configured as inputs. In Waveform mode, TIOA is always configured to be an output and TIOB is an output if it is not selected to be the external trigger. 37.6.6 Trigger A trigger resets the counter and starts the counter clock. Three types of triggers are common to both modes, and a fourth external trigger is available to each mode. Regardless of the trigger used, it will be taken into account at the following active edge of the selected clock. This means that the counter value can be read differently from zero just after a trigger, especially when a low frequency signal is selected as the clock. The following triggers are common to both modes: Software Trigger: Each channel has a software trigger, available by setting SWTRG in TC_CCR. SYNC: Each channel has a synchronization signal SYNC. When asserted, this signal has the same effect as a software trigger. The SYNC signals of all channels are asserted simultaneously by writing TC_BCR (Block Control) with SYNC set. Compare RC Trigger: RC is implemented in each channel and can provide a trigger when the counter value matches the RC value if CPCTRG is set in the TC_CMR. The channel can also be configured to have an external trigger. In Capture mode, the external trigger signal can be selected between TIOA and TIOB. In Waveform mode, an external event can be programmed on one of the following signals: TIOB, XC0, XC1 or XC2. This external event can then be programmed to perform a trigger by setting bit ENETRG in the TC_CMR. If an external trigger is used, the duration of the pulses must be longer than the peripheral clock period in order to be detected. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 857 37.6.7 Capture Mode Capture mode is entered by clearing the WAVE bit in the TC_CMR. Capture mode allows the TC channel to perform measurements such as pulse timing, frequency, period, duty cycle and phase on TIOA and TIOB signals which are considered as inputs. Figure 37-5 shows the configuration of the TC channel when programmed in Capture mode. 37.6.8 Capture Registers A and B Registers A and B (RA and RB) are used as capture registers. They can be loaded with the counter value when a programmable event occurs on the signal TIOA. The LDRA field in the TC_CMR defines the TIOA selected edge for the loading of register A, and the LDRB field defines the TIOA selected edge for the loading of Register B. RA is loaded only if it has not been loaded since the last trigger or if RB has been loaded since the last loading of RA. RB is loaded only if RA has been loaded since the last trigger or the last loading of RB. Loading RA or RB before the read of the last value loaded sets the Overrun Error Flag (LOVRS bit) in the TC_SR. In this case, the old value is overwritten. 37.6.9 Trigger Conditions In addition to the SYNC signal, the software trigger and the RC compare trigger, an external trigger can be defined. The ABETRG bit in the TC_CMR selects TIOA or TIOB input signal as an external trigger . The External Trigger Edge Selection parameter (ETRGEDG field in TC_CMR) defines the edge (rising, falling, or both) detected to generate an external trigger. If ETRGEDG = 0 (none), the external trigger is disabled. 858 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 MTIOA MTIOB 1 ABETRG CLKI If RA is not loaded or RB is Loaded Edge Detector ETRGEDG SWTRG Timer/Counter Channel BURST Peripheral Clock Synchronous Edge Detection S R OVF LDRB Edge Detector Edge Detector Capture Register A LDBSTOP R S CLKEN LDRA If RA is Loaded CPCTRG Counter RESET Trig CLK Q Q CLKSTA LDBDIS Capture Register B CLKDIS TC1_SR TIOA TIOB SYNC XC2 XC1 XC0 TIMER_CLOCK5 TIMER_CLOCK4 TIMER_CLOCK3 TIMER_CLOCK2 TIMER_CLOCK1 TCCLKS Compare RC = Register C COVFS LDRBS INT Figure 37-5. Capture Mode LOVRS CPCS ETRGS LDRAS TC1_IMR Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SAM4S Series [DATASHEET] 859 37.6.10 Waveform Mode Waveform mode is entered by setting the TC_CMRx.WAVE bit. In Waveform mode, the TC channel generates one or two PWM signals with the same frequency and independently programmable duty cycles, or generates different types of one-shot or repetitive pulses. In this mode, TIOA is configured as an output and TIOB is defined as an output if it is not used as an external event (EEVT parameter in TC_CMR). Figure 37-6 shows the configuration of the TC channel when programmed in Waveform operating mode. 37.6.11 Waveform Selection Depending on the WAVSEL parameter in TC_CMR, the behavior of TC_CV varies. With any selection, TC_RA, TC_RB and TC_RC can all be used as compare registers. RA Compare is used to control the TIOA output, RB Compare is used to control the TIOB output (if correctly configured) and RC Compare is used to control TIOA and/or TIOB outputs. 860 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1 EEVT BURST ENETRG CLKI Timer/Counter Channel Edge Detector EEVTEDG SWTRG Peripheral Clock Synchronous Edge Detection Trig CLK R S OVF WAVSEL RESET Counter WAVSEL Q Compare RA = Register A Q CLKSTA Compare RC = Compare RB = CPCSTOP CPCDIS Register C CLKDIS Register B R S CLKEN CPAS INT BSWTRG BEEVT BCPB BCPC ASWTRG AEEVT ACPA ACPC Output Controller TIOB SYNC XC2 XC1 XC0 TIMER_CLOCK5 TIMER_CLOCK4 TIMER_CLOCK3 TIMER_CLOCK2 TIMER_CLOCK1 TCCLKS TIOB MTIOB TIOA MTIOA Figure 37-6. Waveform Mode Output Controller CPCS CPBS COVFS TC1_SR ETRGS TC1_IMR Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SAM4S Series [DATASHEET] 861 37.6.11.1 WAVSEL = 00 When WAVSEL = 00, the value of TC_CV is incremented from 0 to 216-1. Once 216-1 has been reached, the value of TC_CV is reset. Incrementation of TC_CV starts again and the cycle continues. See Figure 37-7. An external event trigger or a software trigger can reset the value of TC_CV. It is important to note that the trigger may occur at any time. See Figure 37-8. RC Compare cannot be programmed to generate a trigger in this configuration. At the same time, RC Compare can stop the counter clock (CPCSTOP = 1 in TC_CMR) and/or disable the counter clock (CPCDIS = 1 in TC_CMR). Figure 37-7. WAVSEL = 00 without Trigger Counter Value Counter cleared by compare match with 0xFFFF 0xFFFF RC RB RA Time Waveform Examples TIOB TIOA Figure 37-8. WAVSEL = 00 with Trigger Counter Value Counter cleared by compare match with 0xFFFF 0xFFFF RC Counter cleared by trigger RB RA Waveform Examples TIOB TIOA 862 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Time 37.6.11.2 WAVSEL = 10 When WAVSEL = 10, the value of TC_CV is incremented from 0 to the value of RC, then automatically reset on a RC Compare. Once the value of TC_CV has been reset, it is then incremented and so on. See Figure 37-9. It is important to note that TC_CV can be reset at any time by an external event or a software trigger if both are programmed correctly. See Figure 37-10. In addition, RC Compare can stop the counter clock (CPCSTOP = 1 in TC_CMR) and/or disable the counter clock (CPCDIS = 1 in TC_CMR). Figure 37-9. WAVSEL = 10 without Trigger Counter Value 2n-1 (n = counter size) Counter cleared by compare match with RC RC RB RA Time Waveform Examples TIOB TIOA Figure 37-10. WAVSEL = 10 with Trigger Counter Value 2n-1 (n = counter size) Counter cleared by compare match with RC Counter cleared by trigger RC RB RA Waveform Examples Time TIOB TIOA SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 863 37.6.11.3 WAVSEL = 01 When WAVSEL = 01, the value of TC_CV is incremented from 0 to 216-1 . Once 216-1 is reached, the value of TC_CV is decremented to 0, then re-incremented to 216-1 and so on. See Figure 37-11. A trigger such as an external event or a software trigger can modify TC_CV at any time. If a trigger occurs while TC_CV is incrementing, TC_CV then decrements. If a trigger is received while TC_CV is decrementing, TC_CV then increments. See Figure 37-12. RC Compare cannot be programmed to generate a trigger in this configuration. At the same time, RC Compare can stop the counter clock (CPCSTOP = 1) and/or disable the counter clock (CPCDIS = 1). Figure 37-11. WAVSEL = 01 without Trigger Counter Value Counter decremented by compare match with 0xFFFF 0xFFFF RC RB RA Time Waveform Examples TIOB TIOA Figure 37-12. WAVSEL = 01 with Trigger Counter Value Counter decremented by compare match with 0xFFFF 0xFFFF Counter decremented by trigger RC RB Counter incremented by trigger RA Waveform Examples TIOB TIOA 864 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Time 37.6.11.4 WAVSEL = 11 When WAVSEL = 11, the value of TC_CV is incremented from 0 to RC. Once RC is reached, the value of TC_CV is decremented to 0, then re-incremented to RC and so on. See Figure 37-13. A trigger such as an external event or a software trigger can modify TC_CV at any time. If a trigger occurs while TC_CV is incrementing, TC_CV then decrements. If a trigger is received while TC_CV is decrementing, TC_CV then increments. See Figure 37-14. RC Compare can stop the counter clock (CPCSTOP = 1) and/or disable the counter clock (CPCDIS = 1). Figure 37-13. WAVSEL = 11 without Trigger Counter Value 2n-1 (n = counter size) Counter decremented by compare match with RC RC RB RA Time Waveform Examples TIOB TIOA Figure 37-14. WAVSEL = 11 with Trigger Counter Value 2n-1 (n = counter size) RC RB Counter decremented by compare match with RC Counter decremented by trigger Counter incremented by trigger RA Waveform Examples Time TIOB TIOA SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 865 37.6.12 External Event/Trigger Conditions An external event can be programmed to be detected on one of the clock sources (XC0, XC1, XC2) or TIOB. The external event selected can then be used as a trigger. The EEVT parameter in TC_CMR selects the external trigger. The EEVTEDG parameter defines the trigger edge for each of the possible external triggers (rising, falling or both). If EEVTEDG is cleared (none), no external event is defined. If TIOB is defined as an external event signal (EEVT = 0), TIOB is no longer used as an output and the compare register B is not used to generate waveforms and subsequently no IRQs. In this case the TC channel can only generate a waveform on TIOA. When an external event is defined, it can be used as a trigger by setting bit ENETRG in the TC_CMR. As in Capture mode, the SYNC signal and the software trigger are also available as triggers. RC Compare can also be used as a trigger depending on the parameter WAVSEL. 866 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.6.13 Output Controller The output controller defines the output level changes on TIOA and TIOB following an event. TIOB control is used only if TIOB is defined as output (not as an external event). The following events control TIOA and TIOB: software trigger, external event and RC compare. RA compare controls TIOA and RB compare controls TIOB. Each of these events can be programmed to set, clear or toggle the output as defined in the corresponding parameter in TC_CMR. 37.6.14 Quadrature Decoder 37.6.14.1 Description The quadrature decoder (QDEC) is driven by TIOA0, TIOB0, TIOB1 input pins and drives the timer/counter of channel 0 and 1. Channel 2 can be used as a time base in case of speed measurement requirements (refer to Figure 37-15). When writing a 0 to bit QDEN of the TC_BMR, the QDEC is bypassed and the IO pins are directly routed to the timer counter function. See TIOA0 and TIOB0 are to be driven by the two dedicated quadrature signals from a rotary sensor mounted on the shaft of the off-chip motor. A third signal from the rotary sensor can be processed through pin TIOB1 and is typically dedicated to be driven by an index signal if it is provided by the sensor. This signal is not required to decode the quadrature signals PHA, PHB. Field TCCLKS of TC_CMRx must be configured to select XC0 input (i.e., 0x101). Field TC0XC0S has no effect as soon as the QDEC is enabled. Either speed or position/revolution can be measured. Position channel 0 accumulates the edges of PHA, PHB input signals giving a high accuracy on motor position whereas channel 1 accumulates the index pulses of the sensor, therefore the number of rotations. Concatenation of both values provides a high level of precision on motion system position. In Speed mode, position cannot be measured but revolution can be measured. Inputs from the rotary sensor can be filtered prior to down-stream processing. Accommodation of input polarity, phase definition and other factors are configurable. Interruptions can be generated on different events. A compare function (using TC_RC) is available on channel 0 (speed/position) or channel 1 (rotation) and can generate an interrupt by means of the CPCS flag in the TC_SRx. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 867 Figure 37-15. Predefined Connection of the Quadrature Decoder with Timer Counters Reset pulse SPEEDEN Quadrature Decoder 1 1 (Filter + Edge Detect + QD) TIOA Timer/Counter Channel 0 TIOA0 QDEN PHEdges 1 TIOB 1 XC0 TIOB0 TIOA0 PHA TIOB0 PHB TIOB1 IDX XC0 Speed/Position QDEN Index 1 TIOB TIOB1 1 XC0 Timer/Counter Channel 1 XC0 Rotation Direction Timer/Counter Channel 2 Speed Time Base 37.6.14.2 Input Pre-processing Input pre-processing consists of capabilities to take into account rotary sensor factors such as polarities and phase definition followed by configurable digital filtering. Each input can be negated and swapping PHA, PHB is also configurable. The MAXFILT field in the TC_BMR is used to configure a minimum duration for which the pulse is stated as valid. When the filter is active, pulses with a duration lower than MAXFILT +1 x tperipheral clock ns are not passed to downstream logic. 868 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 37-16. Input Stage Input Pre-Processing MAXFILT SWAP 1 PHA Filter TIOA0 MAXFILT > 0 1 PHedge Direction and Edge Detection INVA 1 PHB Filter TIOB0 1 DIR 1 IDX INVB 1 1 IDX Filter TIOB1 IDXPHB INVIDX Input filtering can efficiently remove spurious pulses that might be generated by the presence of particulate contamination on the optical or magnetic disk of the rotary sensor. Spurious pulses can also occur in environments with high levels of electro-magnetic interference. Or, simply if vibration occurs even when rotation is fully stopped and the shaft of the motor is in such a position that the beginning of one of the reflective or magnetic bars on the rotary sensor disk is aligned with the light or magnetic (Hall) receiver cell of the rotary sensor. Any vibration can make the PHA, PHB signals toggle for a short duration. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 869 Figure 37-17. Filtering Examples MAXFILT = 2 Peripheral Clock particulate contamination PHA,B Filter Out Optical/Magnetic disk strips PHA PHB motor shaft stopped in such a position that rotary sensor cell is aligned with an edge of the disk rotation stop PHA PHB Edge area due to system vibration PHB Resulting PHA, PHB electrical waveforms PHA stop mechanical shock on system PHB vibration PHA, PHB electrical waveforms after filtering PHA PHB 870 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.6.14.3 Direction Status and Change Detection After filtering, the quadrature signals are analyzed to extract the rotation direction and edges of the two quadrature signals detected in order to be counted by timer/counter logic downstream. The direction status can be directly read at anytime in the TC_QISR. The polarity of the direction flag status depends on the configuration written in TC_BMR. INVA, INVB, INVIDX, SWAP modify the polarity of DIR flag. Any change in rotation direction is reported in the TC_QISR and can generate an interrupt. The direction change condition is reported as soon as two consecutive edges on a phase signal have sampled the same value on the other phase signal and there is an edge on the other signal. The two consecutive edges of one phase signal sampling the same value on other phase signal is not sufficient to declare a direction change, for the reason that particulate contamination may mask one or more reflective bars on the optical or magnetic disk of the sensor. Refer to Figure 37-18 for waveforms. Figure 37-18. Rotation Change Detection Direction Change under normal conditions PHA change condition Report Time PHB DIR DIRCHG No direction change due to particulate contamination masking a reflective bar missing pulse PHA same phase PHB DIR spurious change condition (if detected in a simple way) DIRCHG The direction change detection is disabled when QDTRANS is set in the TC_BMR. In this case, the DIR flag report must not be used. A quadrature error is also reported by the QDEC via the QERR flag in the TC_QISR. This error is reported if the time difference between two edges on PHA, PHB is lower than a predefined value. This predefined value is SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 871 configurable and corresponds to (MAXFILT + 1) x tperipheral clock ns. After being filtered there is no reason to have two edges closer than (MAXFILT + 1) x tperipheral clock ns under normal mode of operation. Figure 37-19. Quadrature Error Detection MAXFILT = 2 Peripheral Clock Abnormally formatted optical disk strips (theoretical view) PHA PHB strip edge inaccurary due to disk etching/printing process PHA PHB resulting PHA, PHB electrical waveforms PHA Even with an abnorrmaly formatted disk, there is no occurence of PHA, PHB switching at the same time. PHB duration < MAXFILT QERR MAXFILT must be tuned according to several factors such as the peripheral clock frequency, type of rotary sensor and rotation speed to be achieved. 37.6.14.4 Position and Rotation Measurement When the POSEN bit is set in the TC_BMR, the motor axis position is processed on channel 0 (by means of the PHA, PHB edge detections) and the number of motor revolutions are recorded on channel 1 if the IDX signal is provided on the TIOB1 input. The position measurement can be read in the TC_CV0 register and the rotation measurement can be read in the TC_CV1 register. Channel 0 and 1 must be configured in Capture mode (TC_CMR0.WAVE = 0). `Rising edge' must be selected as the External Trigger Edge (TC_CMR.ETRGEDG = 0x01) and `TIOA' must be selected as the External Trigger (TC_CMR.ABETRG = 0x1). In parallel, the number of edges are accumulated on timer/counter channel 0 and can be read on the TC_CV0 register. Therefore, the accurate position can be read on both TC_CV registers and concatenated to form a 32-bit word. The timer/counter channel 0 is cleared for each increment of IDX count value. 872 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Depending on the quadrature signals, the direction is decoded and allows to count up or down in timer/counter channels 0 and 1. The direction status is reported on TC_QISR. 37.6.14.5 Speed Measurement When SPEEDEN is set in the TC_BMR, the speed measure is enabled on channel 0. A time base must be defined on channel 2 by writing the TC_RC2 period register. Channel 2 must be configured in Waveform mode (WAVE bit set) in TC_CMR2. The WAVSEL field must be defined with 0x10 to clear the counter by comparison and matching with TC_RC value. Field ACPC must be defined at 0x11 to toggle TIOA output. This time base is automatically fed back to TIOA of channel 0 when QDEN and SPEEDEN are set. Channel 0 must be configured in Capture mode (WAVE = 0 in TC_CMR0). The ABETRG bit of TC_CMR0 must be configured at 1 to select TIOA as a trigger for this channel. EDGTRG must be set to 0x01, to clear the counter on a rising edge of the TIOA signal and field LDRA must be set accordingly to 0x01, to load TC_RA0 at the same time as the counter is cleared (LDRB must be set to 0x01). As a consequence, at the end of each time base period the differentiation required for the speed calculation is performed. The process must be started by configuring bits CLKEN and SWTRG in the TC_CCR. The speed can be read on field RA in TC_RA0. Channel 1 can still be used to count the number of revolutions of the motor. 37.6.15 2-bit Gray Up/Down Counter for Stepper Motor Each channel can be independently configured to generate a 2-bit gray count waveform on corresponding TIOA, TIOB outputs by means of the GCEN bit in TC_SMMRx. Up or Down count can be defined by writing bit DOWN in TC_SMMRx. It is mandatory to configure the channel in Waveform mode in the TC_CMR. The period of the counters can be programmed in TC_RCx. Figure 37-20. 2-bit Gray Up/Down Counter WAVEx = GCENx =1 TIOAx TC_RCx TIOBx DOWNx 37.6.16 Fault Mode At any time, the TC_RCx registers can be used to perform a comparison on the respective current channel counter value (TC_CVx) with the value of TC_RCx register. The CPCSx flags can be set accordingly and an interrupt can be generated. This interrupt is processed but requires an unpredictable amount of time to be achieve the required action. It is possible to trigger the FAULT output of the TIMER1 with CPCS from TC_SR0 and/or CPCS from TC_SR1. Each source can be independently enabled/disabled in the TC_FMR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 873 This can be useful to detect an overflow on speed and/or position when QDEC is processed and to act immediately by using the FAULT output. Figure 37-21. Fault Output Generation AND TC_SR0 flag CPCS OR TC_FMR / ENCF0 AND FAULT (to PWM input) TC_SR1 flag CPCS TC_FMR / ENCF1 37.6.17 Register Write Protection To prevent any single software error from corrupting TC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the TC Write Protection Mode Register (TC_WPMR). The Timer Counter clock of the first channel must be enabled to access TC_WPMR. The following registers can be write-protected: 874 TC Block Mode Register TC Channel Mode Register: Capture Mode TC Channel Mode Register: Waveform Mode TC Fault Mode Register TC Stepper Motor Mode Register TC Register A TC Register B TC Register C SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7 Timer Counter (TC) User Interface Table 37-6. Register Mapping Offset(1) Register Name Access Reset 0x00 + channel * 0x40 + 0x00 Channel Control Register TC_CCR Write-only - 0x00 + channel * 0x40 + 0x04 Channel Mode Register TC_CMR Read/Write 0 0x00 + channel * 0x40 + 0x08 Stepper Motor Mode Register TC_SMMR Read/Write 0 0x00 + channel * 0x40 + 0x0C Reserved - - - 0x00 + channel * 0x40 + 0x10 Counter Value TC_CV 0x00 + channel * 0x40 + 0x14 Register A TC_RA Read-only Read/Write 0 (2) 0 (2) 0 0x00 + channel * 0x40 + 0x18 Register B TC_RB 0x00 + channel * 0x40 + 0x1C Register C TC_RC Read/Write 0 0x00 + channel * 0x40 + 0x20 Status Register TC_SR Read-only 0 0x00 + channel * 0x40 + 0x24 Interrupt Enable Register TC_IER Write-only - 0x00 + channel * 0x40 + 0x28 Interrupt Disable Register TC_IDR Write-only - 0x00 + channel * 0x40 + 0x2C Interrupt Mask Register TC_IMR Read-only 0 0xC0 Block Control Register TC_BCR Write-only - 0xC4 Block Mode Register TC_BMR Read/Write 0 0xC8 QDEC Interrupt Enable Register TC_QIER Write-only - 0xCC QDEC Interrupt Disable Register TC_QIDR Write-only - 0xD0 QDEC Interrupt Mask Register TC_QIMR Read-only 0 0xD4 QDEC Interrupt Status Register TC_QISR Read-only 0 0xD8 Fault Mode Register TC_FMR Read/Write 0 0xE4 Write Protection Mode Register TC_WPMR Read/Write 0 Reserved - - - 0xE8-0xFC Notes: Read/Write 1. Channel index ranges from 0 to 2. 2. Read-only if TC_CMRx.WAVE = 0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 875 37.7.1 TC Channel Control Register Name: TC_CCRx [x=0..2] Address: 0x40010000 (0)[0], 0x40010040 (0)[1], 0x40010080 (0)[2], 0x40014000 (1)[0], 0x40014040 (1)[1], 0x40014080 (1)[2] Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 SWTRG 1 CLKDIS 0 CLKEN * CLKEN: Counter Clock Enable Command 0: No effect. 1: Enables the clock if CLKDIS is not 1. * CLKDIS: Counter Clock Disable Command 0: No effect. 1: Disables the clock. * SWTRG: Software Trigger Command 0: No effect. 1: A software trigger is performed: the counter is reset and the clock is started. 876 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.2 TC Channel Mode Register: Capture Mode Name: TC_CMRx [x=0..2] (CAPTURE_MODE) Address: 0x40010004 (0)[0], 0x40010044 (0)[1], 0x40010084 (0)[2], 0x40014004 (1)[0], 0x40014044 (1)[1], 0x40014084 (1)[2] Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 18 17 24 - 23 - 22 - 21 - 20 - 19 15 WAVE 14 CPCTRG 13 - 12 - 11 - 10 ABETRG 9 7 LDBDIS 6 LDBSTOP 5 4 3 CLKI 2 1 TCCLKS 16 LDRB BURST LDRA 8 ETRGEDG 0 This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * TCCLKS: Clock Selection Value Name Description 0 TIMER_CLOCK1 Clock selected: internal MCK/2 clock signal (from PMC) 1 TIMER_CLOCK2 Clock selected: internal MCK/8 clock signal (from PMC) 2 TIMER_CLOCK3 Clock selected: internal MCK/32 clock signal (from PMC) 3 TIMER_CLOCK4 Clock selected: internal MCK/128 clock signal (from PMC) 4 TIMER_CLOCK5 Clock selected: internal SLCK clock signal (from PMC) 5 XC0 Clock selected: XC0 6 XC1 Clock selected: XC1 7 XC2 Clock selected: XC2 * CLKI: Clock Invert 0: Counter is incremented on rising edge of the clock. 1: Counter is incremented on falling edge of the clock. * BURST: Burst Signal Selection Value Name Description 0 NONE The clock is not gated by an external signal. 1 XC0 XC0 is ANDed with the selected clock. 2 XC1 XC1 is ANDed with the selected clock. 3 XC2 XC2 is ANDed with the selected clock. * LDBSTOP: Counter Clock Stopped with RB Loading 0: Counter clock is not stopped when RB loading occurs. 1: Counter clock is stopped when RB loading occurs. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 877 * LDBDIS: Counter Clock Disable with RB Loading 0: Counter clock is not disabled when RB loading occurs. 1: Counter clock is disabled when RB loading occurs. * ETRGEDG: External Trigger Edge Selection Value Name Description 0 NONE The clock is not gated by an external signal. 1 RISING Rising edge 2 FALLING Falling edge 3 EDGE Each edge * ABETRG: TIOA or TIOB External Trigger Selection 0: TIOB is used as an external trigger. 1: TIOA is used as an external trigger. * CPCTRG: RC Compare Trigger Enable 0: RC Compare has no effect on the counter and its clock. 1: RC Compare resets the counter and starts the counter clock. * WAVE: Waveform Mode 0: Capture mode is enabled. 1: Capture mode is disabled (Waveform mode is enabled). * LDRA: RA Loading Edge Selection Value Name Description 0 NONE None 1 RISING Rising edge of TIOA 2 FALLING Falling edge of TIOA 3 EDGE Each edge of TIOA * LDRB: RB Loading Edge Selection 878 Value Name Description 0 NONE None 1 RISING Rising edge of TIOA 2 FALLING Falling edge of TIOA 3 EDGE Each edge of TIOA SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.3 TC Channel Mode Register: Waveform Mode Name: TC_CMRx [x=0..2] (WAVEFORM_MODE) Address: 0x40010004 (0)[0], 0x40010044 (0)[1], 0x40010084 (0)[2], 0x40014004 (1)[0], 0x40014044 (1)[1], 0x40014084 (1)[2] Access: Read/Write 31 30 29 BSWTRG 23 28 27 BEEVT 22 21 ASWTRG 20 14 13 7 CPCDIS 6 CPCSTOP WAVSEL 25 24 BCPB 19 AEEVT 15 WAVE 26 BCPC 18 17 16 ACPC 12 ENETRG 11 4 3 CLKI 5 BURST ACPA 10 9 EEVT 8 EEVTEDG 2 1 TCCLKS 0 This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * TCCLKS: Clock Selection Value Name Description 0 TIMER_CLOCK1 Clock selected: internal MCK/2 clock signal (from PMC) 1 TIMER_CLOCK2 Clock selected: internal MCK/8 clock signal (from PMC) 2 TIMER_CLOCK3 Clock selected: internal MCK/32 clock signal (from PMC) 3 TIMER_CLOCK4 Clock selected: internal MCK/128 clock signal (from PMC) 4 TIMER_CLOCK5 Clock selected: internal SLCK clock signal (from PMC) 5 XC0 Clock selected: XC0 6 XC1 Clock selected: XC1 7 XC2 Clock selected: XC2 * CLKI: Clock Invert 0: Counter is incremented on rising edge of the clock. 1: Counter is incremented on falling edge of the clock. * BURST: Burst Signal Selection Value Name Description 0 NONE The clock is not gated by an external signal. 1 XC0 XC0 is ANDed with the selected clock. 2 XC1 XC1 is ANDed with the selected clock. 3 XC2 XC2 is ANDed with the selected clock. * CPCSTOP: Counter Clock Stopped with RC Compare 0: Counter clock is not stopped when counter reaches RC. 1: Counter clock is stopped when counter reaches RC. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 879 * CPCDIS: Counter Clock Disable with RC Compare 0: Counter clock is not disabled when counter reaches RC. 1: Counter clock is disabled when counter reaches RC. * EEVTEDG: External Event Edge Selection Value Name Description 0 NONE None 1 RISING Rising edge 2 FALLING Falling edge 3 EDGE Each edge * EEVT: External Event Selection Signal selected as external event. Value Note: Name Description 0 TIOB (1) TIOB Direction TIOB Input 1 XC0 XC0 Output 2 XC1 XC1 Output 3 XC2 XC2 Output 1. If TIOB is chosen as the external event signal, it is configured as an input and no longer generates waveforms and subsequently no IRQs. * ENETRG: External Event Trigger Enable 0: The external event has no effect on the counter and its clock. 1: The external event resets the counter and starts the counter clock. Note: Whatever the value programmed in ENETRG, the selected external event only controls the TIOA output and TIOB if not used as input (trigger event input or other input used). * WAVSEL: Waveform Selection Value Name Description 0 UP UP mode without automatic trigger on RC Compare 1 UPDOWN UPDOWN mode without automatic trigger on RC Compare 2 UP_RC UP mode with automatic trigger on RC Compare 3 UPDOWN_RC UPDOWN mode with automatic trigger on RC Compare * WAVE: Waveform Mode 0: Waveform mode is disabled (Capture mode is enabled). 1: Waveform mode is enabled. * ACPA: RA Compare Effect on TIOA 880 Value Name Description 0 NONE None SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle * ACPC: RC Compare Effect on TIOA Value Name Description 0 NONE None 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle * AEEVT: External Event Effect on TIOA Value Name Description 0 NONE None 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle * ASWTRG: Software Trigger Effect on TIOA Value Name Description 0 NONE None 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle * BCPB: RB Compare Effect on TIOB Value Name Description 0 NONE None 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle * BCPC: RC Compare Effect on TIOB Value Name Description 0 NONE None 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 881 * BEEVT: External Event Effect on TIOB Value Name Description 0 NONE None 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle * BSWTRG: Software Trigger Effect on TIOB 882 Value Name Description 0 NONE None 1 SET Set 2 CLEAR Clear 3 TOGGLE Toggle SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.4 TC Stepper Motor Mode Register Name: TC_SMMRx [x=0..2] Address: 0x40010008 (0)[0], 0x40010048 (0)[1], 0x40010088 (0)[2], 0x40014008 (1)[0], 0x40014048 (1)[1], 0x40014088 (1)[2] Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 DOWN 0 GCEN This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * GCEN: Gray Count Enable 0: TIOAx [x=0..2] and TIOBx [x=0..2] are driven by internal counter of channel x. 1: TIOAx [x=0..2] and TIOBx [x=0..2] are driven by a 2-bit gray counter. * DOWN: Down Count 0: Up counter. 1: Down counter. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 883 37.7.5 TC Counter Value Register Name: TC_CVx [x=0..2] Address: 0x40010010 (0)[0], 0x40010050 (0)[1], 0x40010090 (0)[2], 0x40014010 (1)[0], 0x40014050 (1)[1], 0x40014090 (1)[2] Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 CV 23 22 21 20 CV 15 14 13 12 CV 7 6 5 4 CV * CV: Counter Value CV contains the counter value in real time. IMPORTANT: For 16-bit channels, CV field size is limited to register bits 15:0. 884 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.6 TC Register A Name: TC_RAx [x=0..2] Address: 0x40010014 (0)[0], 0x40010054 (0)[1], 0x40010094 (0)[2], 0x40014014 (1)[0], 0x40014054 (1)[1], 0x40014094 (1)[2] Access: Read-only if TC_CMRx.WAVE = 0, Read/Write if TC_CMRx.WAVE = 1 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RA 23 22 21 20 RA 15 14 13 12 RA 7 6 5 4 RA This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * RA: Register A RA contains the Register A value in real time. IMPORTANT: For 16-bit channels, RA field size is limited to register bits 15:0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 885 37.7.7 TC Register B Name: TC_RBx [x=0..2] Address: 0x40010018 (0)[0], 0x40010058 (0)[1], 0x40010098 (0)[2], 0x40014018 (1)[0], 0x40014058 (1)[1], 0x40014098 (1)[2] Access: Read-only if TC_CMRx.WAVE = 0, Read/Write if TC_CMRx.WAVE = 1 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RB 23 22 21 20 RB 15 14 13 12 RB 7 6 5 4 RB This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * RB: Register B RB contains the Register B value in real time. IMPORTANT: For 16-bit channels, RB field size is limited to register bits 15:0. 886 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.8 TC Register C Name: TC_RCx [x=0..2] Address: 0x4001001C (0)[0], 0x4001005C (0)[1], 0x4001009C (0)[2], 0x4001401C (1)[0], 0x4001405C (1)[1], 0x4001409C (1)[2] Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RC 23 22 21 20 RC 15 14 13 12 RC 7 6 5 4 RC This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * RC: Register C RC contains the Register C value in real time. IMPORTANT: For 16-bit channels, RC field size is limited to register bits 15:0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 887 37.7.9 TC Status Register Name: TC_SRx [x=0..2] Address: 0x40010020 (0)[0], 0x40010060 (0)[1], 0x400100A0 (0)[2], 0x40014020 (1)[0], 0x40014060 (1)[1], 0x400140A0 (1)[2] Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 MTIOB 17 MTIOA 16 CLKSTA 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 ETRGS 6 LDRBS 5 LDRAS 4 CPCS 3 CPBS 2 CPAS 1 LOVRS 0 COVFS * COVFS: Counter Overflow Status (cleared on read) 0: No counter overflow has occurred since the last read of the Status Register. 1: A counter overflow has occurred since the last read of the Status Register. * LOVRS: Load Overrun Status (cleared on read) 0: Load overrun has not occurred since the last read of the Status Register or TC_CMRx.WAVE = 1. 1: RA or RB have been loaded at least twice without any read of the corresponding register since the last read of the Status Register, if TC_CMRx.WAVE = 0. * CPAS: RA Compare Status (cleared on read) 0: RA Compare has not occurred since the last read of the Status Register or TC_CMRx.WAVE = 0. 1: RA Compare has occurred since the last read of the Status Register, if TC_CMRx.WAVE = 1. * CPBS: RB Compare Status (cleared on read) 0: RB Compare has not occurred since the last read of the Status Register or TC_CMRx.WAVE = 0. 1: RB Compare has occurred since the last read of the Status Register, if TC_CMRx.WAVE = 1. * CPCS: RC Compare Status (cleared on read) 0: RC Compare has not occurred since the last read of the Status Register. 1: RC Compare has occurred since the last read of the Status Register. * LDRAS: RA Loading Status (cleared on read) 0: RA Load has not occurred since the last read of the Status Register or TC_CMRx.WAVE = 1. 1: RA Load has occurred since the last read of the Status Register, if TC_CMRx.WAVE = 0. * LDRBS: RB Loading Status (cleared on read) 0: RB Load has not occurred since the last read of the Status Register or TC_CMRx.WAVE = 1. 1: RB Load has occurred since the last read of the Status Register, if TC_CMRx.WAVE = 0. 888 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * ETRGS: External Trigger Status (cleared on read) 0: External trigger has not occurred since the last read of the Status Register. 1: External trigger has occurred since the last read of the Status Register. * CLKSTA: Clock Enabling Status 0: Clock is disabled. 1: Clock is enabled. * MTIOA: TIOA Mirror 0: TIOA is low. If TC_CMRx.WAVE = 0, this means that TIOA pin is low. If TC_CMRx.WAVE = 1, this means that TIOA is driven low. 1: TIOA is high. If TC_CMRx.WAVE = 0, this means that TIOA pin is high. If TC_CMRx.WAVE = 1, this means that TIOA is driven high. * MTIOB: TIOB Mirror 0: TIOB is low. If TC_CMRx.WAVE = 0, this means that TIOB pin is low. If TC_CMRx.WAVE = 1, this means that TIOB is driven low. 1: TIOB is high. If TC_CMRx.WAVE = 0, this means that TIOB pin is high. If TC_CMRx.WAVE = 1, this means that TIOB is driven high. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 889 37.7.10 TC Interrupt Enable Register Name: TC_IERx [x=0..2] Address: 0x40010024 (0)[0], 0x40010064 (0)[1], 0x400100A4 (0)[2], 0x40014024 (1)[0], 0x40014064 (1)[1], 0x400140A4 (1)[2] Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 ETRGS 6 LDRBS 5 LDRAS 4 CPCS 3 CPBS 2 CPAS 1 LOVRS 0 COVFS * COVFS: Counter Overflow 0: No effect. 1: Enables the Counter Overflow Interrupt. * LOVRS: Load Overrun 0: No effect. 1: Enables the Load Overrun Interrupt. * CPAS: RA Compare 0: No effect. 1: Enables the RA Compare Interrupt. * CPBS: RB Compare 0: No effect. 1: Enables the RB Compare Interrupt. * CPCS: RC Compare 0: No effect. 1: Enables the RC Compare Interrupt. * LDRAS: RA Loading 0: No effect. 1: Enables the RA Load Interrupt. * LDRBS: RB Loading 0: No effect. 1: Enables the RB Load Interrupt. 890 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * ETRGS: External Trigger 0: No effect. 1: Enables the External Trigger Interrupt. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 891 37.7.11 TC Interrupt Disable Register Name: TC_IDRx [x=0..2] Address: 0x40010028 (0)[0], 0x40010068 (0)[1], 0x400100A8 (0)[2], 0x40014028 (1)[0], 0x40014068 (1)[1], 0x400140A8 (1)[2] Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 ETRGS 6 LDRBS 5 LDRAS 4 CPCS 3 CPBS 2 CPAS 1 LOVRS 0 COVFS * COVFS: Counter Overflow 0: No effect. 1: Disables the Counter Overflow Interrupt. * LOVRS: Load Overrun 0: No effect. 1: Disables the Load Overrun Interrupt (if TC_CMRx.WAVE = 0). * CPAS: RA Compare 0: No effect. 1: Disables the RA Compare Interrupt (if TC_CMRx.WAVE = 1). * CPBS: RB Compare 0: No effect. 1: Disables the RB Compare Interrupt (if TC_CMRx.WAVE = 1). * CPCS: RC Compare 0: No effect. 1: Disables the RC Compare Interrupt. * LDRAS: RA Loading 0: No effect. 1: Disables the RA Load Interrupt (if TC_CMRx.WAVE = 0). * LDRBS: RB Loading 0: No effect. 1: Disables the RB Load Interrupt (if TC_CMRx.WAVE = 0). 892 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * ETRGS: External Trigger 0: No effect. 1: Disables the External Trigger Interrupt. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 893 37.7.12 TC Interrupt Mask Register Name: TC_IMRx [x=0..2] Address: 0x4001002C (0)[0], 0x4001006C (0)[1], 0x400100AC (0)[2], 0x4001402C (1)[0], 0x4001406C (1)[1], 0x400140AC (1)[2] Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 ETRGS 6 LDRBS 5 LDRAS 4 CPCS 3 CPBS 2 CPAS 1 LOVRS 0 COVFS * COVFS: Counter Overflow 0: The Counter Overflow Interrupt is disabled. 1: The Counter Overflow Interrupt is enabled. * LOVRS: Load Overrun 0: The Load Overrun Interrupt is disabled. 1: The Load Overrun Interrupt is enabled. * CPAS: RA Compare 0: The RA Compare Interrupt is disabled. 1: The RA Compare Interrupt is enabled. * CPBS: RB Compare 0: The RB Compare Interrupt is disabled. 1: The RB Compare Interrupt is enabled. * CPCS: RC Compare 0: The RC Compare Interrupt is disabled. 1: The RC Compare Interrupt is enabled. * LDRAS: RA Loading 0: The Load RA Interrupt is disabled. 1: The Load RA Interrupt is enabled. * LDRBS: RB Loading 0: The Load RB Interrupt is disabled. 1: The Load RB Interrupt is enabled. 894 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * ETRGS: External Trigger 0: The External Trigger Interrupt is disabled. 1: The External Trigger Interrupt is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 895 37.7.13 TC Block Control Register Name: TC_BCR Address: 0x400100C0 (0), 0x400140C0 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 SYNC * SYNC: Synchro Command 0: No effect. 1: Asserts the SYNC signal which generates a software trigger simultaneously for each of the channels. 896 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.14 TC Block Mode Register Name: TC_BMR Address: 0x400100C4 (0), 0x400140C4 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 23 22 21 20 19 - 18 - 17 IDXPHB 16 SWAP 12 EDGPHA 11 QDTRANS 10 SPEEDEN 9 POSEN 8 QDEN 4 3 2 1 0 MAXFILT 15 INVIDX 14 INVB 13 INVA 7 - 6 - 5 TC2XC2S 24 MAXFILT TC1XC1S TC0XC0S This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * TC0XC0S: External Clock Signal 0 Selection Value Name Description 0 TCLK0 Signal connected to XC0: TCLK0 1 - Reserved 2 TIOA1 Signal connected to XC0: TIOA1 3 TIOA2 Signal connected to XC0: TIOA2 * TC1XC1S: External Clock Signal 1 Selection Value Name Description 0 TCLK1 Signal connected to XC1: TCLK1 1 - Reserved 2 TIOA0 Signal connected to XC1: TIOA0 3 TIOA2 Signal connected to XC1: TIOA2 * TC2XC2S: External Clock Signal 2 Selection Value Name Description 0 TCLK2 Signal connected to XC2: TCLK2 1 - Reserved 2 TIOA0 Signal connected to XC2: TIOA0 3 TIOA1 Signal connected to XC2: TIOA1 * QDEN: Quadrature Decoder Enabled 0: Disabled. 1: Enables the QDEC (filter, edge detection and quadrature decoding). Quadrature decoding (direction change) can be disabled using QDTRANS bit. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 897 One of the POSEN or SPEEDEN bits must be also enabled. * POSEN: Position Enabled 0: Disable position. 1: Enables the position measure on channel 0 and 1. * SPEEDEN: Speed Enabled 0: Disabled. 1: Enables the speed measure on channel 0, the time base being provided by channel 2. * QDTRANS: Quadrature Decoding Transparent 0: Full quadrature decoding logic is active (direction change detected). 1: Quadrature decoding logic is inactive (direction change inactive) but input filtering and edge detection are performed. * EDGPHA: Edge on PHA Count Mode 0: Edges are detected on PHA only. 1: Edges are detected on both PHA and PHB. * INVA: Inverted PHA 0: PHA (TIOA0) is directly driving the QDEC. 1: PHA is inverted before driving the QDEC. * INVB: Inverted PHB 0: PHB (TIOB0) is directly driving the QDEC. 1: PHB is inverted before driving the QDEC. * INVIDX: Inverted Index 0: IDX (TIOA1) is directly driving the QDEC. 1: IDX is inverted before driving the QDEC. * SWAP: Swap PHA and PHB 0: No swap between PHA and PHB. 1: Swap PHA and PHB internally, prior to driving the QDEC. * IDXPHB: Index Pin is PHB Pin 0: IDX pin of the rotary sensor must drive TIOA1. 1: IDX pin of the rotary sensor must drive TIOB0. * MAXFILT: Maximum Filter 1-63: Defines the filtering capabilities. Pulses with a period shorter than MAXFILT+1 peripheral clock cycles are discarded. 898 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.15 TC QDEC Interrupt Enable Register Name: TC_QIER Address: 0x400100C8 (0), 0x400140C8 (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 QERR 1 DIRCHG 0 IDX * IDX: Index 0: No effect. 1: Enables the interrupt when a rising edge occurs on IDX input. * DIRCHG: Direction Change 0: No effect. 1: Enables the interrupt when a change on rotation direction is detected. * QERR: Quadrature Error 0: No effect. 1: Enables the interrupt when a quadrature error occurs on PHA, PHB. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 899 37.7.16 TC QDEC Interrupt Disable Register Name: TC_QIDR Address: 0x400100CC (0), 0x400140CC (1) Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 QERR 1 DIRCHG 0 IDX * IDX: Index 0: No effect. 1: Disables the interrupt when a rising edge occurs on IDX input. * DIRCHG: Direction Change 0: No effect. 1: Disables the interrupt when a change on rotation direction is detected. * QERR: Quadrature Error 0: No effect. 1: Disables the interrupt when a quadrature error occurs on PHA, PHB. 900 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.17 TC QDEC Interrupt Mask Register Name: TC_QIMR Address: 0x400100D0 (0), 0x400140D0 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 QERR 1 DIRCHG 0 IDX * IDX: Index 0: The interrupt on IDX input is disabled. 1: The interrupt on IDX input is enabled. * DIRCHG: Direction Change 0: The interrupt on rotation direction change is disabled. 1: The interrupt on rotation direction change is enabled. * QERR: Quadrature Error 0: The interrupt on quadrature error is disabled. 1: The interrupt on quadrature error is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 901 37.7.18 TC QDEC Interrupt Status Register Name: TC_QISR Address: 0x400100D4 (0), 0x400140D4 (1) Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 DIR 7 - 6 - 5 - 4 - 3 - 2 QERR 1 DIRCHG 0 IDX * IDX: Index 0: No Index input change since the last read of TC_QISR. 1: The IDX input has changed since the last read of TC_QISR. * DIRCHG: Direction Change 0: No change on rotation direction since the last read of TC_QISR. 1: The rotation direction changed since the last read of TC_QISR. * QERR: Quadrature Error 0: No quadrature error since the last read of TC_QISR. 1: A quadrature error occurred since the last read of TC_QISR. * DIR: Direction Returns an image of the actual rotation direction. 902 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 37.7.19 TC Fault Mode Register Name: TC_FMR Address: 0x400100D8 (0), 0x400140D8 (1) Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 ENCF1 0 ENCF0 This register can only be written if the WPEN bit is cleared in the TC Write Protection Mode Register. * ENCF0: Enable Compare Fault Channel 0 0: Disables the FAULT output source (CPCS flag) from channel 0. 1: Enables the FAULT output source (CPCS flag) from channel 0. * ENCF1: Enable Compare Fault Channel 1 0: Disables the FAULT output source (CPCS flag) from channel 1. 1: Enables the FAULT output source (CPCS flag) from channel 1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 903 37.7.20 TC Write Protection Mode Register Name: TC_WPMR Address: 0x400100E4 (0), 0x400140E4 (1) Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x54494D ("TIM" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x54494D ("TIM" in ASCII). The Timer Counter clock of the first channel must be enabled to access this register. See Section 37.6.17 "Register Write Protection" for a list of registers that can be write-protected and Timer Counter clock conditions. * WPKEY: Write Protection Key Value 0x54494D 904 Name PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38. High Speed Multimedia Card Interface (HSMCI) 38.1 Description The High Speed Multimedia Card Interface (HSMCI) supports the MultiMedia Card (MMC) Specification V4.3, the SD Memory Card Specification V2.0, the SDIO V2.0 specification and CE-ATA V1.1. The HSMCI includes a command register, response registers, data registers, timeout counters and error detection logic that automatically handle the transmission of commands and, when required, the reception of the associated responses and data with a limited processor overhead. The HSMCI supports stream, block and multi block data read and write, and is compatible with the Peripheral DMA Controller (PDC) Channels, minimizing processor intervention for large buffer transfers. The HSMCI operates at a rate of up to Master Clock divided by 2 and supports the interfacing of 1 slot(s). Each slot may be used to interface with a High Speed MultiMedia Card bus (up to 30 Cards) or with an SD Memory Card. A bit field in the SD Card Register performs this selection. The SD Memory Card communication is based on a 9-pin interface (clock, command, four data and three power lines) and the High Speed MultiMedia Card on a 7-pin interface (clock, command, one data, three power lines and one reserved for future use). The SD Memory Card interface also supports High Speed MultiMedia Card operations. The main differences between SD and High Speed MultiMedia Cards are the initialization process and the bus topology. HSMCI fully supports CE-ATA Revision 1.1, built on the MMC System Specification v4.0. The module includes dedicated hardware to issue the command completion signal and capture the host command completion signal disable. 38.2 Embedded Characteristics Compatible with MultiMedia Card Specification Version 4.3 Compatible with SD Memory Card Specification Version 2.0 Compatible with SDIO Specification Version 2.0 Compatible with CE-ATA Specification 1.1 Cards Clock Rate Up to Master Clock Divided by 2 Boot Operation Mode Support High Speed Mode Support Embedded Power Management to Slow Down Clock Rate When Not Used Supports 1 Multiplexed Slot(s) Each Slot for either a High Speed MultiMedia Card Bus (Up to 30 Cards) or an SD Memory Card Support for Stream, Block and Multi-block Data Read and Write Supports Connection to Peripheral DMA Controller (PDC) Minimizes Processor Intervention for Large Buffer Transfers Built in FIFO (from 16 to 256 bytes) with Large Memory Aperture Supporting Incremental Access Support for CE-ATA Completion Signal Disable Command Protection Against Unexpected Modification On-the-Fly of the Configuration Registers SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 905 38.3 Block Diagram Figure 38-1. Block Diagram (4-bit configuration) APB Bridge PDC APB MCCK(1) MCCDA(1) PMC MCK MCDA0(1) HSMCI Interface PIO MCDA1(1) MCDA2(1) MCDA3(1) Interrupt Control HSMCI Interrupt Note: 906 1. When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to HSMCIx_CDA, MCDAy to HSMCIx_DAy. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.4 Application Block Diagram Figure 38-2. Application Block Diagram Application Layer ex: File System, Audio, Security, etc. Physical Layer HSMCI Interface 1 2 3 4 5 6 7 1 2 3 4 5 6 78 9 9 10 11 1213 8 SDCard MMC 38.5 Pin Name List Table 38-1. I/O Lines Description for 4-bit Configuration (1) Pin Name Pin Description Type(2) Comments MCCDA Command/response I/O/PP/OD CMD of an MMC or SDCard/SDIO MCCK Clock I/O CLK of an MMC or SD Card/SDIO MCDA0-MCDA3 Data 0..3 of Slot A I/O/PP Notes: DAT[0..3] of an MMC DAT[0..3] of an SD Card/SDIO 1. When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to HSMCIx_CDA, MCDAy to HSMCIx_DAy. 2. I: Input, O: Output, PP: Push/Pull, OD: Open Drain. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 907 38.6 Product Dependencies 38.6.1 I/O Lines The pins used for interfacing the High Speed MultiMedia Cards or SD Cards are multiplexed with PIO lines. The programmer must first program the PIO controllers to assign the peripheral functions to HSMCI pins. Table 38-2. I/O Lines Instance Signal I/O Line Peripheral HSMCI MCCDA PA28 C HSMCI MCCK PA29 C HSMCI MCDA0 PA30 C HSMCI MCDA1 PA31 C HSMCI MCDA2 PA26 C HSMCI MCDA3 PA27 C 38.6.2 Power Management The HSMCI is clocked through the Power Management Controller (PMC), so the programmer must first configure the PMC to enable the HSMCI clock. 38.6.3 Interrupt Sources The HSMCI has an interrupt line connected to the interrupt controller. Handling the HSMCI interrupt requires programming the interrupt controller before configuring the HSMCI. Table 38-3. 38.7 Peripheral IDs Instance ID HSMCI 18 Bus Topology Figure 38-3. High Speed MultiMedia Memory Card Bus Topology 1 2 3 4 5 6 7 9 10 11 1213 8 MMC 908 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 The High Speed MultiMedia Card communication is based on a 13-pin serial bus interface. It has three communication lines and four supply lines. Table 38-4. Bus Topology Description HSMCI Pin Name(2) (Slot z) I/O/PP Data MCDz3 CMD I/O/PP/OD Command/response MCCDz 3 VSS1 S Supply voltage ground VSS 4 VDD S Supply voltage VDD 5 CLK I/O Clock MCCK 6 VSS2 S Supply voltage ground VSS 7 DAT[0] I/O/PP Data 0 MCDz0 8 DAT[1] I/O/PP Data 1 MCDz1 9 DAT[2] I/O/PP Data 2 MCDz2 10 DAT[4] I/O/PP Data 4 MCDz4 11 DAT[5] I/O/PP Data 5 MCDz5 12 DAT[6] I/O/PP Data 6 MCDz6 13 DAT[7] I/O/PP Data 7 MCDz7 Pin Number Name Type 1 DAT[3] 2 Notes: 1. 2. Figure 38-4. (1) I: Input, O: Output, PP: Push/Pull, OD: Open Drain. When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to HSMCIx_CDA, MCDAy to HSMCIx_DAy. MMC Bus Connections (One Slot) HSMCI MCDA0 MCCDA MCCK 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 9 10 11 9 10 11 9 10 11 1213 8 MMC1 Note: 1213 8 MMC2 1213 8 MMC3 When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to HSMCIx_CDA MCDAy to HSMCIx_DAy. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 909 Figure 38-5. SD Memory Card Bus Topology 1 2 3 4 56 78 9 SD CARD The SD Memory Card bus includes the signals listed in Table 38-5. Table 38-5. SD Memory Card Bus Signals Description HSMCI Pin Name(2) (Slot z) I/O/PP Card detect/ Data line Bit 3 MCDz3 CMD PP Command/response MCCDz 3 VSS1 S Supply voltage ground VSS 4 VDD S Supply voltage VDD 5 CLK I/O Clock MCCK 6 VSS2 S Supply voltage ground VSS 7 DAT[0] I/O/PP Data line Bit 0 MCDz0 8 DAT[1] I/O/PP Data line Bit 1 or Interrupt MCDz1 9 DAT[2] I/O/PP Data line Bit 2 MCDz2 Pin Number Name Type 1 CD/DAT[3] 2 1. 2. Figure 38-6. I: input, O: output, PP: Push Pull, OD: Open Drain. When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to HSMCIx_CDA, MCDAy to HSMCIx_DAy. SD Card Bus Connections with One Slot MCDA0 - MCDA3 MCCK SD CARD 9 MCCDA 1 2 3 4 5 6 78 Notes: (1) Note: When several HSMCI (x HSMCI) are embedded in a product, MCCK refers to HSMCIx_CK, MCCDA to HSMCIx_CDA MCDAy to HSMCIx_DAy. When the HSMCI is configured to operate with SD memory cards, the width of the data bus can be selected in the HSMCI_SDCR. Clearing the SDCBUS bit in this register means that the width is one bit; setting it means that the width is four bits. In the case of High Speed MultiMedia cards, only the data line 0 is used. The other data lines can be used as independent PIOs. 910 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.8 High Speed MultiMedia Card Operations After a power-on reset, the cards are initialized by a special message-based High Speed MultiMedia Card bus protocol. Each message is represented by one of the following tokens: Command--A command is a token that starts an operation. A command is sent from the host either to a single card (addressed command) or to all connected cards (broadcast command). A command is transferred serially on the CMD line. Response--A response is a token which is sent from an addressed card or (synchronously) from all connected cards to the host as an answer to a previously received command. A response is transferred serially on the CMD line. Data--Data can be transferred from the card to the host or vice versa. Data is transferred via the data line. Card addressing is implemented using a session address assigned during the initialization phase by the bus controller to all currently connected cards. Their unique CID number identifies individual cards. The structure of commands, responses and data blocks is described in the High Speed MultiMedia Card System Specification. See also Table 38-6 on page 912. High Speed MultiMedia Card bus data transfers are composed of these tokens. There are different types of operations. Addressed operations always contain a command and a response token. In addition, some operations have a data token; the others transfer their information directly within the command or response structure. In this case, no data token is present in an operation. The bits on the DAT and the CMD lines are transferred synchronous to the clock HSMCI clock. Two types of data transfer commands are defined: Sequential commands--These commands initiate a continuous data stream. They are terminated only when a stop command follows on the CMD line. This mode reduces the command overhead to an absolute minimum. Block-oriented commands--These commands send a data block succeeded by CRC bits. Both read and write operations allow either single or multiple block transmission. A multiple block transmission is terminated when a stop command follows on the CMD line similarly to the sequential read or when a multiple block transmission has a predefined block count (see Section 38.8.2 "Data Transfer Operation"). The HSMCI provides a set of registers to perform the entire range of High Speed MultiMedia Card operations. 38.8.1 Command - Response Operation After reset, the HSMCI is disabled and becomes valid after setting the MCIEN bit in the HSMCI_CR. The PWSEN bit saves power by dividing the HSMCI clock by 2PWSDIV + 1 when the bus is inactive. The two bits, RDPROOF and WRPROOF in the HSMCI Mode Register (HSMCI_MR) allow stopping the HSMCI clock during read or write access if the internal FIFO is full. This will guarantee data integrity, not bandwidth. All the timings for High Speed MultiMedia Card are defined in the High Speed MultiMedia Card System Specification. The two bus modes (open drain and push/pull) needed to process all the operations are defined in the HSMCI Command Register (HSMCI_CMDR). The HSMCI_CMDR allows a command to be carried out. For example, to perform an ALL_SEND_CID command: Host Command CMD S T Content CRC NID Cycles E Z ****** Response Z S T CID Content High Impedance State Z Z Z SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 911 The command ALL_SEND_CID and the fields and values for the HSMCI_CMDR are described in Table 38-6 and Table 38-7. Table 38-6. ALL_SEND_CID Command Description CMD Index Type Argument Response Abbreviation Command Description CMD2 bcr(1) [31:0] stuff bits R2 ALL_SEND_CID Asks all cards to send their CID numbers on the CMD line Note: 1. Table 38-7. bcr means broadcast command with response. Fields and Values for HSMCI_CMDR Field Value CMDNB (command number) 2 (CMD2) RSPTYP (response type) 2 (R2: 136 bits response) SPCMD (special command) 0 (not a special command) OPCMD (open drain command) 1 MAXLAT (max latency for command to response) 0 (NID cycles ==> 5 cycles) TRCMD (transfer command) 0 (No transfer) TRDIR (transfer direction) X (available only in transfer command) TRTYP (transfer type) X (available only in transfer command) IOSPCMD (SDIO special command) 0 (not a special command) The HSMCI_ARGR contains the argument field of the command. To send a command, the user must perform the following steps: Fill the argument register (HSMCI_ARGR) with the command argument. Set the command register (HSMCI_CMDR) (see Table 38-7). The command is sent immediately after writing the command register. While the card maintains a busy indication (at the end of a STOP_TRANSMISSION command CMD12, for example), a new command shall not be sent. The NOTBUSY flag in the Status Register (HSMCI_SR) is asserted when the card releases the busy indication. If the command requires a response, it can be read in the HSMCI Response Register (HSMCI_RSPR). The response size can be from 48 bits up to 136 bits depending on the command. The HSMCI embeds an error detection to prevent any corrupted data during the transfer. The following flowchart shows how to send a command to the card and read the response if needed. In this example, the status register bits are polled but setting the appropriate bits in the HSMCI Interrupt Enable Register (HSMCI_IER) allows using an interrupt method. 912 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 38-7. Command/Response Functional Flow Diagram Set the command argument HSMCI_ARGR = Argument(1) Set the command HSMCI_CMDR = Command Read HSMCI_SR Wait for command ready status flag 0 CMDRDY 1 Check error bits in the status register (1) Yes Status error flags? RETURN ERROR(1) Read response if required Does the command involve a busy indication? No RETURN OK Read HSMCI_SR 0 NOTBUSY 1 RETURN OK Note: If the command is SEND_OP_COND, the CRC error flag is always present (refer to R3 response in the High Speed MultiMedia Card specification). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 913 38.8.2 Data Transfer Operation The High Speed MultiMedia Card allows several read/write operations (single block, multiple blocks, stream, etc.). These kinds of transfer can be selected setting the Transfer Type (TRTYP) field in the HSMCI Command Register (HSMCI_CMDR). These operations can be done using the features of the Peripheral DMA Controller (PDC). If the PDCMODE bit is set in HSMCI_MR, then all reads and writes use the PDC facilities. In all cases, the block length (BLKLEN field) must be defined either in the HSMCI Mode Register (HSMCI_MR) or in the HSMCI Block Register (HSMCI_BLKR). This field determines the size of the data block. Consequent to MMC Specification 3.1, two types of multiple block read (or write) transactions are defined (the host can use either one at any time): Open-ended/Infinite Multiple block read (or write): The number of blocks for the read (or write) multiple block operation is not defined. The card will continuously transfer (or program) data blocks until a stop transmission command is received. Multiple block read (or write) with predefined block count (since version 3.1 and higher): The card will transfer (or program) the requested number of data blocks and terminate the transaction. The stop command is not required at the end of this type of multiple block read (or write), unless terminated with an error. In order to start a multiple block read (or write) with predefined block count, the host must correctly program the HSMCI Block Register (HSMCI_BLKR). Otherwise the card will start an open-ended multiple block read. The BCNT field of the HSMCI_BLKR defines the number of blocks to transfer (from 1 to 65535 blocks). Programming the value 0 in the BCNT field corresponds to an infinite block transfer. 38.8.3 Read Operation The following flowchart (Figure 38-8) shows how to read a single block with or without use of PDC facilities. In this example, a polling method is used to wait for the end of read. Similarly, the user can configure the HSMCI Interrupt Enable Register (HSMCI_IER) to trigger an interrupt at the end of read. 914 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 38-8. Read Functional Flow Diagram Send SELECT/DESELECT_CARD command(1) to select the card Send SET_BLOCKLEN command(1) No Yes Read with PDC Reset the PDCMODE bit HSMCI_MR &= ~PDCMODE Set the block length (in bytes) HSMCI_BLKR |= (BlockLength <<16) Set the PDCMODE bit HSMCI_MR |= PDCMODE Set the block length (in bytes) HSMCI_BLKR |= (BlockLength << 16) Configure the PDC channel HSMCI_RPR = Data Buffer Address HSMCI_RCR = BlockLength/4 HSMCI_PTCR = RXTEN Send READ_SINGLE_BLOCK command(1) Number of words to read = BlockLength/4 Send READ_SINGLE_BLOCK command(1) Yes Number of words to read = 0 ? Read status register HSMCI_SR No Read status register HSMCI_SR Poll the bit ENDRX = 0? Poll the bit RXRDY = 0? Yes Yes No No RETURN Read data = HSMCI_RDR Number of words to read = Number of words to read -1 RETURN Note: 1. It is assumed that this command has been correctly sent (see Figure 38-7). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 915 38.8.4 Write Operation In write operation, the HSMCI Mode Register (HSMCI_MR) is used to define the padding value when writing nonmultiple block size. If the bit PADV is 0, then 0x00 value is used when padding data, otherwise 0xFF is used. If set, the bit PDCMODE enables PDC transfer. The flowchart in Figure 38-9 shows how to write a single block with or without use of PDC facilities. Polling or interrupt method can be used to wait for the end of write according to the contents of the HSMCI Interrupt Mask Register (HSMCI_IMR). 916 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 38-9. Write Functional Flow Diagram Send SELECT/DESELECT_CARD command(1) to select the card Send SET_BLOCKLEN command(1) Yes No Write using PDC Reset the PDCMODE bit HSMCI_MR &= ~PDCMODE Set the block length HSMCI_BLKR |= (BlockLength <<16) Set the PDCMODE bit HSMCI_MR |= PDCMODE Set the block length HSMCI_BLKR |= (BlockLength << 16) Configure the PDC channel HSMCI_TPR = Data Buffer Address HSMCI_TCR = BlockLength/4 Send WRITE_SINGLE_BLOCK command(1) Number of words to write = BlockLength/4 Send WRITE_SINGLE_BLOCK command(1) HSMCI_PTCR = TXTEN Yes Number of words to write = 0 ? Read status register HSMCI_SR No Read status register HSMCI_SR Poll the bit NOTBUSY= 0? Poll the bit TXRDY = 0? Yes Yes No No RETURN HSMCI_TDR = Data to write Number of words to write = Number of words to write -1 RETURN Note: 1. It is assumed that this command has been correctly sent (see Figure 38-7). The flowchart in Figure 38-10 shows how to manage a multiple write block transfer with the PDC. Polling or interrupt method can be used to wait for the end of write according to the contents of the HSMCI_IMR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 917 Figure 38-10. Multiple Write Functional Flow Diagram Send SELECT/DESELECT_CARD command(1) to select the card Send SET_BLOCKLEN command(1) Set the PDCMODE bit HSMCI_MR |= PDCMODE Set the block length HSMCI_BLKR |= (BlockLength << 16) Configure the PDC channel HSMCI_TPR = Data Buffer Address HSMCI_TCR = BlockLength/4 Send WRITE_MULTIPLE_BLOCK command(1) HSMCI_PTCR = TXTEN Read status register HSMCI_SR Poll the bit BLKE = 0? Yes No Send STOP_TRANSMISSION command(1) Poll the bit NOTBUSY = 0? Yes No RETURN Note: 38.9 1. It is assumed that this command has been correctly sent (see Figure 38-7). SD/SDIO Card Operation The High Speed MultiMedia Card Interface allows processing of SD Memory (Secure Digital Memory Card) and SDIO (SD Input Output) Card commands. SD/SDIO cards are based on the MultiMedia Card (MMC) format, but are physically slightly thicker and feature higher data transfer rates, a lock switch on the side to prevent accidental overwriting and security features. The 918 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 physical form factor, pin assignment and data transfer protocol are forward-compatible with the High Speed MultiMedia Card with some additions. SD slots can actually be used for more than flash memory cards. Devices that support SDIO can use small devices designed for the SD form factor, such as GPS receivers, Wi-Fi or Bluetooth adapters, modems, barcode readers, IrDA adapters, FM radio tuners, RFID readers, digital cameras and more. SD/SDIO is covered by numerous patents and trademarks, and licensing is only available through the Secure Digital Card Association. The SD/SDIO Card communication is based on a 9-pin interface (Clock, Command, 4 x Data and 3 x Power lines). The communication protocol is defined as a part of this specification. The main difference between the SD/SDIO Card and the High Speed MultiMedia Card is the initialization process. The SD/SDIO Card Register (HSMCI_SDCR) allows selection of the Card Slot and the data bus width. The SD/SDIO Card bus allows dynamic configuration of the number of data lines. After power up, by default, the SD/SDIO Card uses only DAT0 for data transfer. After initialization, the host can change the bus width (number of active data lines). 38.9.1 SDIO Data Transfer Type SDIO cards may transfer data in either a multi-byte (1 to 512 bytes) or an optional block format (1 to 511 blocks), while the SD memory cards are fixed in the block transfer mode. The TRTYP field in the HSMCI Command Register (HSMCI_CMDR) allows to choose between SDIO Byte or SDIO Block transfer. The number of bytes/blocks to transfer is set through the BCNT field in the HSMCI Block Register (HSMCI_BLKR). In SDIO Block mode, the field BLKLEN must be set to the data block size while this field is not used in SDIO Byte mode. An SDIO Card can have multiple I/O or combined I/O and memory (called Combo Card). Within a multi-function SDIO or a Combo card, there are multiple devices (I/O and memory) that share access to the SD bus. In order to allow the sharing of access to the host among multiple devices, SDIO and combo cards can implement the optional concept of suspend/resume (Refer to the SDIO Specification for more details). To send a suspend or a resume command, the host must set the SDIO Special Command field (IOSPCMD) in the HSMCI Command Register. 38.9.2 SDIO Interrupts Each function within an SDIO or Combo card may implement interrupts (Refer to the SDIO Specification for more details). In order to allow the SDIO card to interrupt the host, an interrupt function is added to a pin on the DAT[1] line to signal the card's interrupt to the host. An SDIO interrupt on each slot can be enabled through the HSMCI Interrupt Enable Register. The SDIO interrupt is sampled regardless of the currently selected slot. 38.10 CE-ATA Operation CE-ATA maps the streamlined ATA command set onto the MMC interface. The ATA task file is mapped onto MMC register space. CE-ATA utilizes five MMC commands: GO_IDLE_STATE (CMD0): used for hard reset. STOP_TRANSMISSION (CMD12): causes the ATA command currently executing to be aborted. FAST_IO (CMD39): Used for single register access to the ATA taskfile registers, 8-bit access only. RW_MULTIPLE_REGISTERS (CMD60): used to issue an ATA command or to access the control/status registers. RW_MULTIPLE_BLOCK (CMD61): used to transfer data for an ATA command. CE-ATA utilizes the same MMC command sequences for initialization as traditional MMC devices. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 919 38.10.1 Executing an ATA Polling Command 1. Issue READ_DMA_EXT with RW_MULTIPLE_REGISTER (CMD60) for 8 KB of DATA. 2. Read the ATA status register until DRQ is set. 3. Issue RW_MULTIPLE_BLOCK (CMD61) to transfer DATA. 4. Read the ATA status register until DRQ && BSY are configured to 0. 38.10.2 Executing an ATA Interrupt Command 1. Issue READ_DMA_EXT with RW_MULTIPLE_REGISTER (CMD60) for 8 KB of DATA with nIEN field set to zero to enable the command completion signal in the device. 2. Issue RW_MULTIPLE_BLOCK (CMD61) to transfer DATA. 3. Wait for Completion Signal Received Interrupt. 38.10.3 Aborting an ATA Command If the host needs to abort an ATA command prior to the completion signal it must send a special command to avoid potential collision on the command line. The SPCMD field of the HSMCI_CMDR must be set to 3 to issue the CEATA completion Signal Disable Command. 38.10.4 CE-ATA Error Recovery Several methods of ATA command failure may occur, including: No response to an MMC command, such as RW_MULTIPLE_REGISTER (CMD60). CRC is invalid for an MMC command or response. CRC16 is invalid for an MMC data packet. ATA Status register reflects an error by setting the ERR bit to one. The command completion signal does not arrive within a host specified time out period. Error conditions are expected to happen infrequently. Thus, a robust error recovery mechanism may be used for each error event. The recommended error recovery procedure after a timeout is: Issue the command completion signal disable if nIEN was cleared to zero and the RW_MULTIPLE_BLOCK (CMD61) response has been received. Issue STOP_TRANSMISSION (CMD12) and successfully receive the R1 response. Issue a software reset to the CE-ATA device using FAST_IO (CMD39). If STOP_TRANMISSION (CMD12) is successful, then the device is again ready for ATA commands. However, if the error recovery procedure does not work as expected or there is another timeout, the next step is to issue GO_IDLE_STATE (CMD0) to the device. GO_IDLE_STATE (CMD0) is a hard reset to the device and completely resets all device states. Note that after issuing GO_IDLE_STATE (CMD0), all device initialization needs to be completed again. If the CEATA device completes all MMC commands correctly but fails the ATA command with the ERR bit set in the ATA Status register, no error recovery action is required. The ATA command itself failed implying that the device could not complete the action requested, however, there was no communication or protocol failure. After the device signals an error by setting the ERR bit to one in the ATA Status register, the host may attempt to retry the command. 38.11 HSMCI Boot Operation Mode In boot operation mode, the processor can read boot data from the slave (MMC device) by keeping the CMD line low after power-on before issuing CMD1. The data can be read from either the boot area or user area, depending on register setting. As it is not possible to boot directly on SD-CARD, a preliminary boot code must be stored in internal Flash. 920 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.11.1 Boot Procedure, Processor Mode 1. Configure the HSMCI data bus width programming SDCBUS Field in the HSMCI_SDCR. The BOOT_BUS_WIDTH field located in the device Extended CSD register must be set accordingly. 2. Set the byte count to 512 bytes and the block count to the desired number of blocks, writing BLKLEN and BCNT fields of the HSMCI_BLKR. 3. Issue the Boot Operation Request command by writing to the HSMCI_CMDR with SPCMD field set to BOOTREQ, TRDIR set to READ and TRCMD set to "start data transfer". 4. The BOOT_ACK field located in the HSMCI_CMDR must be set to one, if the BOOT_ACK field of the MMC device located in the Extended CSD register is set to one. 5. Host processor can copy boot data sequentially as soon as the RXRDY flag is asserted. 6. When Data transfer is completed, host processor shall terminate the boot stream by writing the HSMCI_CMDR with SPCMD field set to BOOTEND. 38.12 HSMCI Transfer Done Timings 38.12.1 Definition The XFRDONE flag in the HSMCI_SR indicates exactly when the read or write sequence is finished. 38.12.2 Read Access During a read access, the XFRDONE flag behaves as shown in Figure 38-11. Figure 38-11. XFRDONE During a Read Access CMD line HSMCI read CMD Card response The CMDRDY flag is released 8 tbit after the end of the card response. CMDRDY flag Data 1st Block Last Block Not busy flag XFRDONE flag 38.12.3 Write Access During a write access, the XFRDONE flag behaves as shown in Figure 38-12. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 921 Figure 38-12. XFRDONE During a Write Access CMD line HSMCI write CMD CMDRDY flag Card response The CMDRDY flag is released 8 tbit after the end of the card response. D0 is tied by the card D0 is released D0 1st Block Last Block 1st Block Last Block Data bus - D0 Not busy flag XFRDONE flag 922 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.13 Register Write Protection To prevent any single software error from corrupting HSMCI behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the HSMCI Write Protection Mode Register (HSMCI_WPMR). If a write access to a write-protected register is detected, the WPVS bit in the HSMCI Write Protection Status Register (HSMCI_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading the HSMCI_WPSR. The following registers can be protected: HSMCI Mode Register HSMCI Data Timeout Register HSMCI SDCard/SDIO Register HSMCI Completion Signal Timeout Register HSMCI Configuration Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 923 38.14 High Speed MultiMedia Card Interface (HSMCI) User Interface Table 38-8. Register Mapping Offset Register Name Access Reset 0x00 Control Register HSMCI_CR Write-only - 0x04 Mode Register HSMCI_MR Read/Write 0x0 0x08 Data Timeout Register HSMCI_DTOR Read/Write 0x0 0x0C SD/SDIO Card Register HSMCI_SDCR Read/Write 0x0 0x10 Argument Register HSMCI_ARGR Read/Write 0x0 0x14 Command Register HSMCI_CMDR Write-only - 0x18 Block Register HSMCI_BLKR Read/Write 0x0 0x1C Completion Signal Timeout Register HSMCI_CSTOR Read/Write 0x0 Response Register (1) HSMCI_RSPR Read-only 0x0 Response Register (1) HSMCI_RSPR Read-only 0x0 0x28 Response Register (1) HSMCI_RSPR Read-only 0x0 0x2C Response Register(1) HSMCI_RSPR Read-only 0x0 0x30 Receive Data Register HSMCI_RDR Read-only 0x0 0x34 Transmit Data Register HSMCI_TDR Write-only - Reserved - - - 0x40 Status Register HSMCI_SR Read-only 0xC0E5 0x44 Interrupt Enable Register HSMCI_IER Write-only - 0x48 Interrupt Disable Register HSMCI_IDR Write-only - 0x4C Interrupt Mask Register HSMCI_IMR Read-only 0x0 0x50 Reserved - - - 0x54 Configuration Register HSMCI_CFG Read/Write 0x00 Reserved - - - 0xE4 Write Protection Mode Register HSMCI_WPMR Read/Write - 0xE8 Write Protection Status Register HSMCI_WPSR Read-only - Reserved - - - Reserved for PDC registers - - - Reserved - FIFO Memory Aperture0 HSMCI_FIFO0 0x20 0x24 0x38-0x3C 0x58-0xE0 0xEC-0xFC 0x100-0x128 0x12C-0x1FC 0x200 ... 0x5FC Notes: 924 ... FIFO Memory Aperture255 ... HSMCI_FIFO255 - - Read/Write 0x0 ... ... Read/Write 0x0 1. The Response Register can be read by N accesses at the same HSMCI_RSPR or at consecutive addresses (0x20 to 0x2C). N depends on the size of the response. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.1 HSMCI Control Register Name: HSMCI_CR Address: 0x40000000 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 SWRST 6 - 5 - 4 - 3 PWSDIS 2 PWSEN 1 MCIDIS 0 MCIEN * MCIEN: Multi-Media Interface Enable 0: No effect. 1: Enables the Multi-Media Interface if MCDIS is 0. * MCIDIS: Multi-Media Interface Disable 0: No effect. 1: Disables the Multi-Media Interface. * PWSEN: Power Save Mode Enable 0: No effect. 1: Enables the Power Saving Mode if PWSDIS is 0. Warning: Before enabling this mode, the user must set a value different from 0 in the PWSDIV field of the HSMCI_MR. * PWSDIS: Power Save Mode Disable 0: No effect. 1: Disables the Power Saving Mode. * SWRST: Software Reset 0: No effect. 1: Resets the HSMCI. A software triggered hardware reset of the HSMCI is performed. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 925 38.14.2 HSMCI Mode Register Name: HSMCI_MR Address: 0x40000004 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 PDCMODE 14 PADV 13 FBYTE 12 WRPROOF 11 RDPROOF 10 9 PWSDIV 8 7 6 5 4 3 2 1 0 CLKDIV This register can only be written if the WPEN bit is cleared in the HSMCI Write Protection Mode Register. * CLKDIV: Clock Divider High Speed MultiMedia Card Interface clock (MCCK or HSMCI_CK) is Master Clock (MCK) divided by (2*(CLKDIV+1)). * PWSDIV: Power Saving Divider High Speed MultiMedia Card Interface clock is divided by 2(PWSDIV) + 1 when entering Power Saving Mode. Warning: This value must be different from 0 before enabling the Power Save Mode in the HSMCI_CR (HSMCI_PWSEN bit). * RDPROOF: Read Proof Enable Enabling Read Proof allows to stop the HSMCI Clock during read access if the internal FIFO is full. This will guarantee data integrity, not bandwidth. 0: Disables Read Proof. 1: Enables Read Proof. * WRPROOF: Write Proof Enable Enabling Write Proof allows to stop the HSMCI Clock during write access if the internal FIFO is full. This will guarantee data integrity, not bandwidth. 0: Disables Write Proof. 1: Enables Write Proof. * FBYTE: Force Byte Transfer Enabling Force Byte Transfer allow byte transfers, so that transfer of blocks with a size different from modulo 4 can be supported. Warning: BLKLEN value depends on FBYTE. 0: Disables Force Byte Transfer. 1: Enables Force Byte Transfer. 926 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * PADV: Padding Value 0: 0x00 value is used when padding data in write transfer. 1: 0xFF value is used when padding data in write transfer. PADV may be only in manual transfer. * PDCMODE: PDC-oriented Mode 0: Disables PDC transfer 1: Enables PDC transfer. In this case, UNRE and OVRE flags in the HSMCI Status Register (HSMCI_SR) are deactivated after the PDC transfer has been completed. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 927 38.14.3 HSMCI Data Timeout Register Name: HSMCI_DTOR Address: 0x40000008 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 5 DTOMUL 4 3 2 1 0 DTOCYC This register can only be written if the WPEN bit is cleared in the HSMCI Write Protection Mode Register. * DTOCYC: Data Timeout Cycle Number This field determines the maximum number of Master Clock cycles that the HSMCI waits between two data block transfers. It equals (DTOCYC x Multiplier). * DTOMUL: Data Timeout Multiplier Value Name Description 0 1 DTOCYC 1 16 DTOCYC x 16 2 128 DTOCYC x 128 3 256 DTOCYC x 256 4 1024 DTOCYC x 1024 5 4096 DTOCYC x 4096 6 65536 DTOCYC x 65536 7 1048576 DTOCYC x 1048576 If the data time-out set by DTOCYC and DTOMUL has been exceeded, the Data Time-out Error flag (DTOE) in the HSMCI Status Register (HSMCI_SR) rises. 928 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.4 HSMCI SDCard/SDIO Register Name: HSMCI_SDCR Address: 0x4000000C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 6 5 - 4 - 3 - 2 - 1 7 SDCBUS 0 SDCSEL This register can only be written if the WPEN bit is cleared in the HSMCI Write Protection Mode Register. * SDCSEL: SDCard/SDIO Slot Value Name Description 0 SLOTA Slot A is selected. 1 SLOTB - 2 SLOTC - 3 SLOTD - * SDCBUS: SDCard/SDIO Bus Width Value Name Description 0 1 1 bit 1 - Reserved 2 4 4 bits 3 8 8 bits SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 929 38.14.5 HSMCI Argument Register Name: HSMCI_ARGR Address: 0x40000010 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 ARG 23 22 21 20 ARG 15 14 13 12 ARG 7 6 5 4 ARG * ARG: Command Argument 930 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.6 HSMCI Command Register Name: HSMCI_CMDR Address: 0x40000014 Access: Write-only 31 - 30 - 29 - 28 - 27 BOOT_ACK 26 ATACS 25 23 - 22 - 21 20 TRTYP 19 18 TRDIR 17 15 - 14 - 13 - 12 MAXLAT 11 OPDCMD 10 9 SPCMD 8 6 5 4 3 2 1 0 7 RSPTYP 24 IOSPCMD 16 TRCMD CMDNB This register is write-protected while CMDRDY is 0 in HSMCI_SR. If an Interrupt command is sent, this register is only writable by an interrupt response (field SPCMD). This means that the current command execution cannot be interrupted or modified. * CMDNB: Command Number This is the command index. * RSPTYP: Response Type Value Name Description 0 NORESP No response 1 48_BIT 48-bit response 2 136_BIT 136-bit response 3 R1B R1b response type * SPCMD: Special Command Value Name Description 0 STD Not a special CMD. 1 INIT Initialization CMD: 74 clock cycles for initialization sequence. 2 SYNC 3 CE_ATA CE-ATA Completion Signal disable Command. The host cancels the ability for the device to return a command completion signal on the command line. 4 IT_CMD Interrupt command: Corresponds to the Interrupt Mode (CMD40). 5 IT_RESP Interrupt response: Corresponds to the Interrupt Mode (CMD40). 6 BOR Boot Operation Request. Start a boot operation mode, the host processor can read boot data from the MMC device directly. 7 EBO End Boot Operation. This command allows the host processor to terminate the boot operation mode. Synchronized CMD: Wait for the end of the current data block transfer before sending the pending command. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 931 * OPDCMD: Open Drain Command 0 (PUSHPULL): Push pull command. 1 (OPENDRAIN): Open drain command. * MAXLAT: Max Latency for Command to Response 0 (5): 5-cycle max latency. 1 (64): 64-cycle max latency. * TRCMD: Transfer Command Value Name Description 0 NO_DATA 1 START_DAT A Start data transfer 2 STOP_DATA Stop data transfer 3 - No data transfer Reserved * TRDIR: Transfer Direction 0 (WRITE): Write. 1 (READ): Read. * TRTYP: Transfer Type Value Name Description 0 SINGLE 1 MULTIPLE 2 STREAM 4 BYTE SDIO Byte 5 BLOCK SDIO Block MMC/SD Card Single Block MMC/SD Card Multiple Block MMC Stream * IOSPCMD: SDIO Special Command Value Name Description 0 STD 1 SUSPEND SDIO Suspend Command 2 RESUME SDIO Resume Command Not an SDIO Special Command * ATACS: ATA with Command Completion Signal 0 (NORMAL): Normal operation mode. 1 (COMPLETION): This bit indicates that a completion signal is expected within a programmed amount of time (HSMCI_CSTOR). * BOOT_ACK: Boot Operation Acknowledge The master can choose to receive the boot acknowledge from the slave when a Boot Request command is issued. When set to one this field indicates that a Boot acknowledge is expected within a programmable amount of time defined with DTOMUL and DTOCYC fields located in the HSMCI_DTOR. If the acknowledge pattern is not received then an acknowledge timeout error is raised. If the acknowledge pattern is corrupted then an acknowledge pattern error is set. 932 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.7 HSMCI Block Register Name: HSMCI_BLKR Address: 0x40000018 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 BLKLEN 23 22 21 20 BLKLEN 15 14 13 12 BCNT 7 6 5 4 BCNT * BCNT: MMC/SDIO Block Count - SDIO Byte Count This field determines the number of data byte(s) or block(s) to transfer. The transfer data type and the authorized values for BCNT field are determined by the TRTYP field in the HSMCI Command Register (HSMCI_CMDR). When TRTYP = 1 (MMC/SDCARD Multiple Block), BCNT can be programmed from 1 to 65535, 0 corresponds to an infinite block transfer. When TRTYP = 4 (SDIO Byte), BCNT can be programmed from 1 to 511, 0 corresponds to 512-byte transfer. Values in range 512 to 65536 are forbidden. When TRTYP = 5 (SDIO Block), BCNT can be programmed from 1 to 511, 0 corresponds to an infinite block transfer. Values in range 512 to 65536 are forbidden. Warning: In SDIO Byte and Block modes (TRTYP = 4 or 5), writing the 7 last bits of BCNT field with a value which differs from 0 is forbidden and may lead to unpredictable results. * BLKLEN: Data Block Length This field determines the size of the data block. Bits 16 and 17 must be configured to 0 if FBYTE is disabled. Note: In SDIO Byte mode, BLKLEN field is not used. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 933 38.14.8 HSMCI Completion Signal Timeout Register Name: HSMCI_CSTOR Address: 0x4000001C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 5 CSTOMUL 4 3 2 1 0 CSTOCYC This register can only be written if the WPEN bit is cleared in the HSMCI Write Protection Mode Register. * CSTOCYC: Completion Signal Timeout Cycle Number This field determines the maximum number of Master Clock cycles that the HSMCI waits between two data block transfers. Its value is calculated by (CSTOCYC x Multiplier). * CSTOMUL: Completion Signal Timeout Multiplier This field determines the maximum number of Master Clock cycles that the HSMCI waits between two data block transfers. Its value is calculated by (CSTOCYC x Multiplier). These fields determine the maximum number of Master Clock cycles that the HSMCI waits between the end of the data transfer and the assertion of the completion signal. The data transfer comprises data phase and the optional busy phase. If a non-DATA ATA command is issued, the HSMCI starts waiting immediately after the end of the response until the completion signal. Multiplier is defined by CSTOMUL as shown in the following table: Value Name Description 0 1 CSTOCYC x 1 1 16 CSTOCYC x 16 2 128 CSTOCYC x 128 3 256 CSTOCYC x 256 4 1024 CSTOCYC x 1024 5 4096 CSTOCYC x 4096 6 65536 CSTOCYC x 65536 7 1048576 CSTOCYC x 1048576 If the data time-out set by CSTOCYC and CSTOMUL has been exceeded, the Completion Signal Time-out Error flag (CSTOE) in the HSMCI Status Register (HSMCI_SR) rises. 934 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.9 HSMCI Response Register Name: HSMCI_RSPR Address: 0x40000020 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 RSP 23 22 21 20 RSP 15 14 13 12 RSP 7 6 5 4 RSP * RSP: Response Note: 1. The response register can be read by N accesses at the same HSMCI_RSPR or at consecutive addresses (0x20 to 0x2C). N depends on the size of the response. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 935 38.14.10HSMCI Receive Data Register Name: HSMCI_RDR Address: 0x40000030 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 DATA 23 22 21 20 DATA 15 14 13 12 DATA 7 6 5 4 DATA * DATA: Data to Read 936 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.11HSMCI Transmit Data Register Name: HSMCI_TDR Address: 0x40000034 Access: Write-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 DATA 23 22 21 20 DATA 15 14 13 12 DATA 7 6 5 4 DATA * DATA: Data to Write SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 937 38.14.12HSMCI Status Register Name: HSMCI_SR Address: 0x40000040 Access: Read-only 31 UNRE 30 OVRE 29 ACKRCVE 28 ACKRCV 27 XFRDONE 26 FIFOEMPTY 25 - 24 - 23 CSTOE 22 DTOE 21 DCRCE 20 RTOE 19 RENDE 18 RCRCE 17 RDIRE 16 RINDE 15 TXBUFE 14 RXBUFF 13 CSRCV 12 SDIOWAIT 11 - 10 - 9 - 8 SDIOIRQA 7 ENDTX 6 ENDRX 5 NOTBUSY 4 DTIP 3 BLKE 2 TXRDY 1 RXRDY 0 CMDRDY * CMDRDY: Command Ready (cleared by writing in HSMCI_CMDR) 0: A command is in progress. 1: The last command has been sent. * RXRDY: Receiver Ready (cleared by reading HSMCI_RDR) 0: Data has not yet been received since the last read of HSMCI_RDR. 1: Data has been received since the last read of HSMCI_RDR. * TXRDY: Transmit Ready (cleared by writing in HSMCI_TDR) 0: The last data written in HSMCI_TDR has not yet been transferred in the Shift Register. 1: The last data written in HSMCI_TDR has been transferred in the Shift Register. * BLKE: Data Block Ended (cleared on read) This flag must be used only for Write Operations. 0: A data block transfer is not yet finished. 1: A data block transfer has ended, including the CRC16 Status transmission. The flag is set for each transmitted CRC Status. Refer to the MMC or SD Specification for more details concerning the CRC Status. * DTIP: Data Transfer in Progress (cleared at the end of CRC16 calculation) 0: No data transfer in progress. 1: The current data transfer is still in progress, including CRC16 calculation. * NOTBUSY: HSMCI Not Busy A block write operation uses a simple busy signalling of the write operation duration on the data (DAT0) line: during a data transfer block, if the card does not have a free data receive buffer, the card indicates this condition by pulling down the data line (DAT0) to LOW. The card stops pulling down the data line as soon as at least one receive buffer for the defined data transfer block length becomes free. Refer to the MMC or SD Specification for more details concerning the busy behavior. 938 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 For all the read operations, the NOTBUSY flag is cleared at the end of the host command. For the Infinite Read Multiple Blocks, the NOTBUSY flag is set at the end of the STOP_TRANSMISSION host command (CMD12). For the Single Block Reads, the NOTBUSY flag is set at the end of the data read block. For the Multiple Block Reads with predefined block count, the NOTBUSY flag is set at the end of the last received data block. The NOTBUSY flag allows to deal with these different states. 0: The HSMCI is not ready for new data transfer. Cleared at the end of the card response. 1: The HSMCI is ready for new data transfer. Set when the busy state on the data line has ended. This corresponds to a free internal data receive buffer of the card. * ENDRX: End of RX Buffer (cleared by writing HSMCI_RCR or HSMCI_RNCR(1)) 0: The Receive Counter Register has not reached 0 since the last write in HSMCI_RCR or HSMCI_RNCR. 1: The Receive Counter Register has reached 0 since the last write in HSMCI_RCR or HSMCI_RNCR. * ENDTX: End of TX Buffer (cleared by writing HSMCI_TCR or HSMCI_TNCR(1)) 0: The Transmit Counter Register has not reached 0 since the last write in HSMCI_TCR or HSMCI_TNCR. 1: The Transmit Counter Register has reached 0 since the last write in HSMCI_TCR or HSMCI_TNCR. Note: BLKE and NOTBUSY flags can be used to check that the data has been successfully transmitted on the data lines and not only transferred from the PDC to the HSMCI Controller. * SDIOIRQA: SDIO Interrupt for Slot A (cleared on read) 0: No interrupt detected on SDIO Slot A. 1: An SDIO Interrupt on Slot A occurred. * SDIOWAIT: SDIO Read Wait Operation Status 0: Normal Bus operation. 1: The data bus has entered IO wait state. * CSRCV: CE-ATA Completion Signal Received (cleared on read) 0: No completion signal received since last status read operation. 1: The device has issued a command completion signal on the command line. * RXBUFF: RX Buffer Full (cleared by writing HSMCI_RCR or HSMCI_RNCR(1)) 0: HSMCI_RCR or HSMCI_RNCR has a value other than 0. 1: Both HSMCI_RCR and HSMCI_RNCR have a value of 0. * TXBUFE: TX Buffer Empty (cleared by writing HSMCI_TCR or HSMCI_TNCR(1)) 0: HSMCI_TCR or HSMCI_TNCR has a value other than 0. 1: Both HSMCI_TCR and HSMCI_TNCR have a value of 0. Note: BLKE and NOTBUSY flags can be used to check that the data has been successfully transmitted on the data lines and not only transferred from the PDC to the HSMCI Controller. * RINDE: Response Index Error (cleared by writing in HSMCI_CMDR) 0: No error. 1: A mismatch is detected between the command index sent and the response index received. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 939 * RDIRE: Response Direction Error (cleared by writing in HSMCI_CMDR) 0: No error. 1: The direction bit from card to host in the response has not been detected. * RCRCE: Response CRC Error (cleared by writing in HSMCI_CMDR) 0: No error. 1: A CRC7 error has been detected in the response. * RENDE: Response End Bit Error (cleared by writing in HSMCI_CMDR) 0: No error. 1: The end bit of the response has not been detected. * RTOE: Response Time-out Error (cleared by writing in HSMCI_CMDR) 0: No error. 1: The response time-out set by MAXLAT in the HSMCI_CMDR has been exceeded. * DCRCE: Data CRC Error (cleared on read) 0: No error. 1: A CRC16 error has been detected in the last data block. * DTOE: Data Time-out Error (cleared on read) 0: No error. 1: The data time-out set by DTOCYC and DTOMUL in HSMCI_DTOR has been exceeded. * CSTOE: Completion Signal Time-out Error (cleared on read) 0: No error. 1: The completion signal time-out set by CSTOCYC and CSTOMUL in HSMCI_CSTOR has been exceeded. * FIFOEMPTY: FIFO empty flag 0: FIFO contains at least one byte. 1: FIFO is empty. * XFRDONE: Transfer Done flag 0: A transfer is in progress. 1: Command Register is ready to operate and the data bus is in the idle state. * ACKRCV: Boot Operation Acknowledge Received (cleared on read) 0: No Boot acknowledge received since the last read of the HSMCI_SR. 1: A Boot acknowledge signal has been received since the last read of HSMCI_SR. * ACKRCVE: Boot Operation Acknowledge Error (cleared on read) 0: No boot operation error since the last read of HSMCI_SR 1: Corrupted Boot Acknowledge signal received since the last read of HSMCI_SR. 940 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * OVRE: Overrun (if FERRCTRL = 1, cleared by writing in HSMCI_CMDR or cleared on read if FERRCTRL = 0) 0: No error. 1: At least one 8-bit received data has been lost (not read). If FERRCTRL = 1 in HSMCI_CFG, OVRE is cleared on read. If FERRCTRL = 0 in HSMCI_CFG, OVRE is cleared by writing HSMCI_CMDR. * UNRE: Underrun (if FERRCTRL = 1, cleared by writing in HSMCI_CMDR or cleared on read if FERRCTRL = 0) 0: No error. 1: At least one 8-bit data has been sent without valid information (not written). If FERRCTRL = 1 in HSMCI_CFG, OVRE is cleared on read. If FERRCTRL = 0 in HSMCI_CFG, OVRE is cleared by writing HSMCI_CMDR. Note: 1. HSMCI_RCR, HSMCI_RNCR, HSMCI_TCR, HSMCI_TNCR are PDC registers. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 941 38.14.13HSMCI Interrupt Enable Register Name: HSMCI_IER Address: 0x40000044 Access: Write-only 31 UNRE 30 OVRE 29 ACKRCVE 28 ACKRCV 27 XFRDONE 26 FIFOEMPTY 25 - 24 - 23 CSTOE 22 DTOE 21 DCRCE 20 RTOE 19 RENDE 18 RCRCE 17 RDIRE 16 RINDE 15 TXBUFE 14 RXBUFF 13 CSRCV 12 SDIOWAIT 11 - 10 - 9 - 8 SDIOIRQA 7 ENDTX 6 ENDRX 5 NOTBUSY 4 DTIP 3 BLKE 2 TXRDY 1 RXRDY 0 CMDRDY The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Enables the corresponding interrupt. * CMDRDY: Command Ready Interrupt Enable * RXRDY: Receiver Ready Interrupt Enable * TXRDY: Transmit Ready Interrupt Enable * BLKE: Data Block Ended Interrupt Enable * DTIP: Data Transfer in Progress Interrupt Enable * NOTBUSY: Data Not Busy Interrupt Enable * ENDRX: End of Receive Buffer Interrupt Enable * ENDTX: End of Transmit Buffer Interrupt Enable * SDIOIRQA: SDIO Interrupt for Slot A Interrupt Enable * SDIOWAIT: SDIO Read Wait Operation Status Interrupt Enable * CSRCV: Completion Signal Received Interrupt Enable * RXBUFF: Receive Buffer Full Interrupt Enable * TXBUFE: Transmit Buffer Empty Interrupt Enable * RINDE: Response Index Error Interrupt Enable * RDIRE: Response Direction Error Interrupt Enable * RCRCE: Response CRC Error Interrupt Enable * RENDE: Response End Bit Error Interrupt Enable 942 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * RTOE: Response Time-out Error Interrupt Enable * DCRCE: Data CRC Error Interrupt Enable * DTOE: Data Time-out Error Interrupt Enable * CSTOE: Completion Signal Timeout Error Interrupt Enable * FIFOEMPTY: FIFO empty Interrupt enable * XFRDONE: Transfer Done Interrupt enable * ACKRCV: Boot Acknowledge Interrupt Enable * ACKRCVE: Boot Acknowledge Error Interrupt Enable * OVRE: Overrun Interrupt Enable * UNRE: Underrun Interrupt Enable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 943 38.14.14HSMCI Interrupt Disable Register Name: HSMCI_IDR Address: 0x40000048 Access: Write-only 31 UNRE 30 OVRE 29 ACKRCVE 28 ACKRCV 27 XFRDONE 26 FIFOEMPTY 25 - 24 - 23 CSTOE 22 DTOE 21 DCRCE 20 RTOE 19 RENDE 18 RCRCE 17 RDIRE 16 RINDE 15 TXBUFE 14 RXBUFF 13 CSRCV 12 SDIOWAIT 11 - 10 - 9 - 8 SDIOIRQA 7 ENDTX 6 ENDRX 5 NOTBUSY 4 DTIP 3 BLKE 2 TXRDY 1 RXRDY 0 CMDRDY The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Disables the corresponding interrupt. * CMDRDY: Command Ready Interrupt Disable * RXRDY: Receiver Ready Interrupt Disable * TXRDY: Transmit Ready Interrupt Disable * BLKE: Data Block Ended Interrupt Disable * DTIP: Data Transfer in Progress Interrupt Disable * NOTBUSY: Data Not Busy Interrupt Disable * ENDRX: End of Receive Buffer Interrupt Disable * ENDTX: End of Transmit Buffer Interrupt Disable * SDIOIRQA: SDIO Interrupt for Slot A Interrupt Disable * SDIOWAIT: SDIO Read Wait Operation Status Interrupt Disable * CSRCV: Completion Signal received interrupt Disable * RXBUFF: Receive Buffer Full Interrupt Disable * TXBUFE: Transmit Buffer Empty Interrupt Disable * RINDE: Response Index Error Interrupt Disable * RDIRE: Response Direction Error Interrupt Disable * RCRCE: Response CRC Error Interrupt Disable * RENDE: Response End Bit Error Interrupt Disable 944 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * RTOE: Response Time-out Error Interrupt Disable * DCRCE: Data CRC Error Interrupt Disable * DTOE: Data Time-out Error Interrupt Disable * CSTOE: Completion Signal Time out Error Interrupt Disable * FIFOEMPTY: FIFO empty Interrupt Disable * XFRDONE: Transfer Done Interrupt Disable * ACKRCV: Boot Acknowledge Interrupt Disable * ACKRCVE: Boot Acknowledge Error Interrupt Disable * OVRE: Overrun Interrupt Disable * UNRE: Underrun Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 945 38.14.15HSMCI Interrupt Mask Register Name: HSMCI_IMR Address: 0x4000004C Access: Read-only 31 UNRE 30 OVRE 29 ACKRCVE 28 ACKRCV 27 XFRDONE 26 FIFOEMPTY 25 - 24 - 23 CSTOE 22 DTOE 21 DCRCE 20 RTOE 19 RENDE 18 RCRCE 17 RDIRE 16 RINDE 15 TXBUFE 14 RXBUFF 13 CSRCV 12 SDIOWAIT 11 - 10 - 9 - 8 SDIOIRQA 7 ENDTX 6 ENDRX 5 NOTBUSY 4 DTIP 3 BLKE 2 TXRDY 1 RXRDY 0 CMDRDY The following configuration values are valid for all listed bit names of this register: 0: The corresponding interrupt is not enabled. 1: The corresponding interrupt is enabled. * CMDRDY: Command Ready Interrupt Mask * RXRDY: Receiver Ready Interrupt Mask * TXRDY: Transmit Ready Interrupt Mask * BLKE: Data Block Ended Interrupt Mask * DTIP: Data Transfer in Progress Interrupt Mask * NOTBUSY: Data Not Busy Interrupt Mask * ENDRX: End of Receive Buffer Interrupt Mask * ENDTX: End of Transmit Buffer Interrupt Mask * SDIOIRQA: SDIO Interrupt for Slot A Interrupt Mask * SDIOWAIT: SDIO Read Wait Operation Status Interrupt Mask * CSRCV: Completion Signal Received Interrupt Mask * RXBUFF: Receive Buffer Full Interrupt Mask * TXBUFE: Transmit Buffer Empty Interrupt Mask * RINDE: Response Index Error Interrupt Mask * RDIRE: Response Direction Error Interrupt Mask * RCRCE: Response CRC Error Interrupt Mask * RENDE: Response End Bit Error Interrupt Mask 946 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * RTOE: Response Time-out Error Interrupt Mask * DCRCE: Data CRC Error Interrupt Mask * DTOE: Data Time-out Error Interrupt Mask * CSTOE: Completion Signal Time-out Error Interrupt Mask * FIFOEMPTY: FIFO Empty Interrupt Mask * XFRDONE: Transfer Done Interrupt Mask * ACKRCV: Boot Operation Acknowledge Received Interrupt Mask * ACKRCVE: Boot Operation Acknowledge Error Interrupt Mask * OVRE: Overrun Interrupt Mask * UNRE: Underrun Interrupt Mask SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 947 38.14.16HSMCI Configuration Register Name: HSMCI_CFG Address: 0x40000054 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 LSYNC 11 - 10 - 9 - 8 HSMODE 7 - 6 - 5 - 4 FERRCTRL 3 - 2 - 1 - 0 FIFOMODE This register can only be written if the WPEN bit is cleared in the HSMCI Write Protection Mode Register. * FIFOMODE: HSMCI Internal FIFO control mode 0: A write transfer starts when a sufficient amount of data is written into the FIFO. When the block length is greater than or equal to 3/4 of the HSMCI internal FIFO size, then the write transfer starts as soon as half the FIFO is filled. When the block length is greater than or equal to half the internal FIFO size, then the write transfer starts as soon as one quarter of the FIFO is filled. In other cases, the transfer starts as soon as the total amount of data is written in the internal FIFO. 1: A write transfer starts as soon as one data is written into the FIFO. * FERRCTRL: Flow Error flag reset control mode 0: When an underflow/overflow condition flag is set, a new Write/Read command is needed to reset the flag. 1: When an underflow/overflow condition flag is set, a read status resets the flag. * HSMODE: High Speed Mode 0: Default bus timing mode. 1: If set to one, the host controller outputs command line and data lines on the rising edge of the card clock. The Host driver shall check the high speed support in the card registers. * LSYNC: Synchronize on the last block 0: The pending command is sent at the end of the current data block. 1: The pending command is sent at the end of the block transfer when the transfer length is not infinite (block count shall be different from zero). 948 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.17HSMCI Write Protection Mode Register Name: HSMCI_WPMR Address: 0x400000E4 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protect Enable 0: Disables the Write Protection if WPKEY corresponds to 0x4D4349 ("MCI" in ASCII). 1: Enables the Write Protection if WPKEY corresponds to 0x4D4349 ("MCI" in ASCII). See Section 38.13 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protect Key Value Name 0x4D4349 PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 949 38.14.18HSMCI Write Protection Status Register Name: HSMCI_WPSR Address: 0x400000E8 Access: Read-only 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 - 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPVS WPVSRC 15 14 13 12 WPVSRC 7 - 6 - 5 - 4 - * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the HSMCI_WPSR. 1: A write protection violation has occurred since the last read of the HSMCI_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. 950 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 38.14.19HSMCI FIFOx Memory Aperture Name: HSMCI_FIFOx [x=0..255] Address: 0x40000200 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 DATA 23 22 21 20 DATA 15 14 13 12 DATA 7 6 5 4 DATA * DATA: Data to Read or Data to Write SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 951 39. Pulse Width Modulation Controller (PWM) 39.1 Description The Pulse Width Modulation Controller (PWM) generates output pulses on 4 channels independently according to parameters defined per channel. Each channel controls two complementary square output waveforms. Characteristics of the output waveforms such as period, duty-cycle, polarity and dead-times (also called deadbands or non-overlapping times) are configured through the user interface. Each channel selects and uses one of the clocks provided by the clock generator. The clock generator provides several clocks resulting from the division of the PWM peripheral clock. All accesses to the PWM are made through registers mapped on the peripheral bus. All channels integrate a double buffering system in order to prevent an unexpected output waveform while modifying the period, the dutycycle or the dead-times. Channels can be linked together as synchronous channels to be able to update their duty-cycle or dead-times at the same time. The update of duty-cycles of synchronous channels can be performed by the Peripheral DMA Controller channel which offers buffer transfer without processor Intervention. The PWM provides 8 independent comparison units capable of comparing a programmed value to the counter of the synchronous channels (counter of channel 0). These comparisons are intended to generate software interrupts, to trigger pulses on the 2 independent event lines (in order to synchronize ADC conversions with a lot of flexibility independently of the PWM outputs) and to trigger Peripheral DMA Controllertransfer requests. PWM outputs can be overridden synchronously or asynchronously to their channel counter. The PWM provides a fault protection mechanism with 8 fault inputs, capable to detect a fault condition and to override the PWM outputs asynchronously (outputs forced to `0', `1'). For safety usage, some configuration registers are write-protected. 952 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.2 Embedded Characteristics 4 Channels Common Clock Generator Providing Thirteen Different Clocks A Modulo n Counter Providing Eleven Clocks Two Independent Linear Dividers Working on Modulo n Counter Outputs Independent Channels Independent 16-bit Counter for Each Channel Independent Complementary Outputs with 12-bit Dead-Time Generator (Also Called Dead-Band or Non-Overlapping Time) for Each Channel Independent Enable Disable Command for Each Channel Independent Clock Selection for Each Channel Independent Period, Duty-Cycle and Dead-Time for Each Channel Independent Double Buffering of Period, Duty-Cycle and Dead-Times for Each Channel Independent Programmable Selection of The Output Waveform Polarity for Each Channel Independent Programmable Center- or Left-aligned Output Waveform for Each Channel Independent Output Override for Each Channel Independent Interrupt for Each Channel, at Each Period for Left-Aligned or Center-Aligned Configuration 2 2-bit Gray Up/Down Channels for Stepper Motor Control Synchronous Channel Mode Synchronous Channels Share the Same Counter Mode to Update the Synchronous Channels Registers after a Programmable Number of Periods Synchronous Channels Supports Connection of one Peripheral DMA Controller Channel Which Offers Buffer Transfer Without Processor Intervention To Update Duty-Cycle Registers 2 Independent Events Lines Intended to Synchronize ADC Conversions Programmable delay for Events Lines to delay ADC measurements 8 Comparison Units Intended to Generate Interrupts, Pulses on Event Lines and Peripheral DMA Controller Transfer Requests 8 Programmable Fault Inputs Providing an Asynchronous Protection of PWM Outputs 3 User Driven through PIO Inputs PMC Driven when Crystal Oscillator Clock Fails ADC Controller Driven through Configurable Comparison Function Analog Comparator Controller Driven Timer/Counter Driven through Configurable Comparison Function Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 953 39.3 Block Diagram Figure 39-1. Pulse Width Modulation Controller Block Diagram PWM Controller Channel x Update Period Duty-Cycle MUX Counter Channel x Clock Selector DTOHx Dead-Time Generator DTOLx OOOHx Output Override OOOLx PWMHx Fault Protection PWMLx PWMHx PWMLx SYNCx Comparator OCx PIO Channel 0 Update Period Comparator OC0 DTOH0 Dead-Time Generator DTOL0 OOOH0 Output Override OOOL0 PWMH0 Fault Protection PWML0 PWMH0 PWML0 Duty-Cycle Counter Channel 0 Clock Selector PWMFIx PIO PWMFI0 event line 0 event line 1 Comparison Units Events Generator ADC event line x PMC Peripheral Clock CLOCK Generator APB Interface Interrupt Generator Interrupt Controller APB 39.4 I/O Lines Description Each channel outputs two complementary external I/O lines. Table 39-1. 39.5 I/O Line Description Name Description Type PWMHx PWM Waveform Output High for channel x Output PWMLx PWM Waveform Output Low for channel x Output PWMFIx PWM Fault Input x Input Product Dependencies 39.5.1 I/O Lines The pins used for interfacing the PWM are multiplexed with PIO lines. The programmer must first program the PIO controller to assign the desired PWM pins to their peripheral function. If I/O lines of the PWM are not used by the application, they can be used for other purposes by the PIO controller. 954 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 All of the PWM outputs may or may not be enabled. If an application requires only four channels, then only four PIO lines will be assigned to PWM outputs. Table 39-2. I/O Lines Instance Signal I/O Line Peripheral PWM PWMFI0 PA9 C PWM PWMFI1 PA10 C PWM PWMFI2 PA18 D PWM PWMH0 PA0 A PWM PWMH0 PA11 B PWM PWMH0 PA23 B PWM PWMH0 PB0 A PWM PWMH0 PC18 B PWM PWMH1 PA1 A PWM PWMH1 PA12 B PWM PWMH1 PA24 B PWM PWMH1 PB1 A PWM PWMH1 PC19 B PWM PWMH2 PA2 A PWM PWMH2 PA13 B PWM PWMH2 PA25 B PWM PWMH2 PB4 B PWM PWMH2 PC20 B PWM PWMH3 PA7 B PWM PWMH3 PA14 B PWM PWMH3 PA17 C PWM PWMH3 PB14 B PWM PWMH3 PC21 B PWM PWML0 PA19 B PWM PWML0 PB5 B PWM PWML0 PC0 B PWM PWML0 PC13 B PWM PWML1 PA20 B PWM PWML1 PB12 A PWM PWML1 PC1 B PWM PWML1 PC15 B PWM PWML2 PA16 C PWM PWML2 PA30 A PWM PWML2 PB13 A PWM PWML2 PC2 B SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 955 Table 39-2. I/O Lines PWM PWML3 PA15 C PWM PWML3 PC3 B PWM PWML3 PC22 B 39.5.2 Power Management The PWM is not continuously clocked. The programmer must first enable the PWM clock in the Power Management Controller (PMC) before using the PWM. However, if the application does not require PWM operations, the PWM clock can be stopped when not needed and be restarted later. In this case, the PWM will resume its operations where it left off. 39.5.3 Interrupt Sources The PWM interrupt line is connected on one of the internal sources of the Interrupt Controller. Using the PWM interrupt requires the Interrupt Controller to be programmed first. Table 39-3. Peripheral IDs Instance ID PWM 31 39.5.4 Fault Inputs The PWM has the fault inputs connected to the different modules. Please refer to the implementation of these module within the product for detailed information about the fault generation procedure. The PWM receives faults from PIO inputs, the PMC, the ADC controller, the Analog Comparator Controller and Timer/Counters. Table 39-4. Fault Inputs Fault Generator External PWM Fault Input Number Polarity Level(1) Fault Input ID PA9 PWMFI0 User-defined 0 Main OSC (PMC) - To be configured to 1 1 ADC - To be configured to 1 2 Analog Comparator - To be configured to 1 3 Timer0 - To be configured to 1 4 Timer1 - To be configured to 1 5 Note: 956 1. FPOL field in PWMC_FMR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.6 Functional Description The PWM controller is primarily composed of a clock generator module and 4 channels. Clocked by the peripheral clock, the clock generator module provides 13 clocks. Each channel can independently choose one of the clock generator outputs. Each channel generates an output waveform with attributes that can be defined independently for each channel through the user interface registers. 39.6.1 PWM Clock Generator Figure 39-2. Functional View of the Clock Generator Block Diagram Peripheral Clock modulo n counter peripheral clock peripheral clock/2 peripheral clock/4 peripheral clock/8 peripheral clock/16 peripheral clock/32 peripheral clock/64 peripheral clock/128 peripheral clock/256 peripheral clock/512 peripheral clock/1024 Divider A PREA clkA DIVA PWM_MR Divider B PREB clkB DIVB PWM_MR The PWM peripheral clock is divided in the clock generator module to provide different clocks available for all channels. Each channel can independently select one of the divided clocks. The clock generator is divided into different blocks: a modulo n counter which provides 11 clocks: fperipheral clock, fperipheral clock/2, fperipheral clock/4, fperipheral clock/8, fperipheral clock/16, fperipheral clock/32, fperipheral clock/64, fperipheral clock/128, fperipheral clock/256, fperipheral clock/512, fperipheral clock/1024 two linear dividers (1, 1/2, 1/3, ... 1/255) that provide two separate clocks: clkA and clkB Each linear divider can independently divide one of the clocks of the modulo n counter. The selection of the clock to be divided is made according to the PREA (PREB) field of the PWM Clock register (PWM_CLK). The resulting clock clkA (clkB) is the clock selected divided by DIVA (DIVB) field value. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 957 After a reset of the PWM controller, DIVA (DIVB) and PREA (PREB) are set to `0'. This implies that after reset clkA (clkB) are turned off. At reset, all clocks provided by the modulo n counter are turned off except the peripheral clock. This situation is also true when the PWM peripheral clock is turned off through the Power Management Controller. CAUTION: Before using the PWM controller, the programmer must first enable the peripheral clock in the Power Management Controller (PMC). 39.6.2 PWM Channel 39.6.2.1 Channel Block Diagram Figure 39-3. Functional View of the Channel Block Diagram Channel x Update Period MUX Comparator x OCx PWMHx OOOHx DTOHx Dead-Time Output Fault Generator DTOLx Override OOOLx Protection PWMLx Duty-Cycle MUX from Clock Generator Clock Selector SYNCx Counter Channel x from APB Peripheral Bus Counter Channel 0 2-bit gray counter z Comparator y MUX z = 0 (x = 0, y = 1), z = 1 (x = 2, y = 3), z = 2 (x = 4, y = 5), z = 3 (x = 6, y = 7) Channel y (= x+1) OCy PWMHy OOOHy DTOHy Dead-Time Output Fault Generator DTOLy Override OOOLy Protection PWMLy Each of the 4 channels is composed of six blocks: 958 A clock selector which selects one of the clocks provided by the clock generator (described in Section 39.6.1 "PWM Clock Generator"). A counter clocked by the output of the clock selector. This counter is incremented or decremented according to the channel configuration and comparators matches. The size of the counter is 16 bits. A comparator used to compute the OCx output waveform according to the counter value and the configuration. The counter value can be the one of the channel counter or the one of the channel 0 counter according to SYNCx bit in the PWM Sync Channels Mode Register (PWM_SCM). A 2-bit configurable gray counter enables the stepper motor driver. One gray counter drives 2 channels. A dead-time generator providing two complementary outputs (DTOHx/DTOLx) which allows to drive external power control switches safely. An output override block that can force the two complementary outputs to a programmed value (OOOHx/OOOLx). An asynchronous fault protection mechanism that has the highest priority to override the two complementary outputs (PWMHx/PWMLx) in case of fault detection (outputs forced to `0', `1'). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.6.2.2 Comparator The comparator continuously compares its counter value with the channel period defined by CPRD in the PWM Channel Period Register (PWM_CPRDx) and the duty-cycle defined by CDTY in the PWM Channel Duty Cycle Register (PWM_CDTYx) to generate an output signal OCx accordingly. The different properties of the waveform of the output OCx are: the clock selection. The channel counter is clocked by one of the clocks provided by the clock generator described in the previous section. This channel parameter is defined in the CPRE field of the PWM Channel Mode Register (PWM_CMRx). This field is reset at `0'. the waveform period. This channel parameter is defined in the CPRD field of the PWM_CPRDx register. If the waveform is left-aligned, then the output waveform period depends on the counter source clock and can be calculated: By using the PWM peripheral clock divided by an X given prescaler value (with X being 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024), the resulting period formula will be: ( X x CPRD )------------------------------f peripheral clock By using the PWM peripheral clock divided by one of both DIVA or DIVB divider, the formula becomes, respectively: ( X x C RPD x DIVA -) --------------------------------------------------or f peripheral clock ( X x C RPD x DIVB -) --------------------------------------------------f peripheral clock If the waveform is center-aligned then the output waveform period depends on the counter source clock and can be calculated: By using the PWM peripheral clock divided by an X given prescaler value (with X being 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024). The resulting period formula will be: (---------------------------------------2 x X x CPRD ) f peripheral clock By using the PWM peripheral clock divided by one of both DIVA or DIVB divider, the formula becomes, respectively: ( 2 x X x C PRD x DIVA ) ------------------------------------------------------------or f peripheral clock ( 2 x X x C PRD x DIVB ) ------------------------------------------------------------f peripheral clock the waveform duty-cycle. This channel parameter is defined in the CDTY field of the PWM_CDTYx register. If the waveform is left-aligned then: ( period - 1 fchannel_x_clock x CDTY ) duty cycle = ---------------------------------------------------------------------------------------------------period If the waveform is center-aligned, then: ( ( period 2 ) - 1 fchannel_x_clock x CDTY ) ) duty cycle = ------------------------------------------------------------------------------------------------------------------( period 2 ) the waveform polarity. At the beginning of the period, the signal can be at high or low level. This property is defined in the CPOL bit of the PWM_CMRx. By default the signal starts by a low level. the waveform SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 959 alignment. The output waveform can be left or center-aligned. Center-aligned waveforms can be used to generate non-overlapped waveforms. This property is defined in the CALG bit of the PWM_CMRx. The default mode is left-aligned. Figure 39-4. Non-Overlapped Center-Aligned Waveforms No overlap OC0 OC1 Period Note: 1. See Figure 39-5 for a detailed description of center-aligned waveforms. When center-aligned, the channel counter increases up to CPRD and decreases down to 0. This ends the period. When left-aligned, the channel counter increases up to CPRD and is reset. This ends the period. Thus, for the same CPRD value, the period for a center-aligned channel is twice the period for a left-aligned channel. Waveforms are fixed at 0 when: CDTY = CPRD and CPOL = 0 CDTY = 0 and CPOL = 1 Waveforms are fixed at 1 (once the channel is enabled) when: CDTY = 0 and CPOL = 0 CDTY = CPRD and CPOL = 1 The waveform polarity must be set before enabling the channel. This immediately affects the channel output level. Modifying CPOL in PWM Channel Mode Register while the channel is enabled can lead to an unexpected behavior of the device being driven by PWM. In addition to generating the output signals OCx, the comparator generates interrupts depending on the counter value. When the output waveform is left-aligned, the interrupt occurs at the end of the counter period. When the output waveform is center-aligned, the bit CES of PWM_CMRx defines when the channel counter interrupt occurs. If CES is set to `0', the interrupt occurs at the end of the counter period. If CES is set to `1', the interrupt occurs at the end of the counter period and at half of the counter period. Figure 39-5 illustrates the counter interrupts depending on the configuration. 960 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 39-5. Waveform Properties Channel x slected clock CHIDx(PWM_SR) CHIDx(PWM_ENA) CHIDx(PWM_DIS) Center Aligned CALG(PWM_CMRx) = 1 PWM_CCNTx CPRD(PWM_CPRDx) CDTY(PWM_CDTYx) Period Output Waveform OCx CPOL(PWM_CMRx) = 0 Output Waveform OCx CPOL(PWM_CMRx) = 1 Counter Event CHIDx(PWM_ISR) CES(PWM_CMRx) = 0 Counter Event CHIDx(PWM_ISR) CES(PWM_CMRx) = 1 Left Aligned CALG(PWM_CMRx) = 0 PWM_CCNTx CPRD(PWM_CPRDx) CDTY(PWM_CDTYx) Period Output Waveform OCx CPOL(PWM_CMRx) = 0 Output Waveform OCx CPOL(PWM_CMRx) = 1 Counter Event CHIDx(PWM_ISR) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 961 39.6.2.3 2-bit Gray Up/Down Counter for Stepper Motor A pair of channels may provide a 2-bit gray count waveform on two outputs. Dead-time generator and other downstream logic can be configured on these channels. Up or Down Count mode can be configured on-the-fly by means of PWM_SMMR configuration registers. When GCEN0 is set to `1', channels 0 and 1 outputs are driven with gray counter. Figure 39-6. 2-bit Gray Up/Down Counter GCEN0 = 1 PWMH0 PWML0 PWMH1 PWML1 DOWNx 39.6.2.4 Dead-Time Generator The dead-time generator uses the comparator output OCx to provide the two complementary outputs DTOHx and DTOLx, which allows the PWM macrocell to drive external power control switches safely. When the dead-time generator is enabled by setting the bit DTE to 1 or 0 in the PWM Channel Mode Register (PWM_CMRx), deadtimes (also called dead-bands or non-overlapping times) are inserted between the edges of the two complementary outputs DTOHx and DTOLx. Note that enabling or disabling the dead-time generator is allowed only if the channel is disabled. The dead-time is adjustable by the PWM Channel Dead Time Register (PWM_DTx). Both outputs of the dead-time generator can be adjusted separately by DTH and DTL. The dead-time values can be updated synchronously to the PWM period by using the PWM Channel Dead Time Update Register (PWM_DTUPDx). The dead-time is based on a specific counter which uses the same selected clock that feeds the channel counter of the comparator. Depending on the edge and the configuration of the dead-time, DTOHx and DTOLx are delayed until the counter has reached the value defined by DTH or DTL. An inverted configuration bit (DTHI and DTLI bit in the PWM_CMRx) is provided for each output to invert the dead-time outputs. The following figure shows the waveform of the dead-time generator. 962 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 39-7. Complementary Output Waveforms Output waveform OCx CPOLx = 0 Output waveform DTOHx DTHIx = 0 Output waveform DTOLx DTLIx = 0 Output waveform DTOHx DTHIx = 1 Output waveform DTOLx DTLIx = 1 DTHx DTLx DTHx DTLx Output waveform OCx CPOLx = 1 Output waveform DTOHx DTHIx = 0 Output waveform DTOLx DTLIx = 0 Output waveform DTOHx DTHIx = 1 Output waveform DTOLx DTLIx = 1 39.6.2.5 Output Override The two complementary outputs DTOHx and DTOLx of the dead-time generator can be forced to a value defined by the software. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 963 Figure 39-8. Override Output Selection DTOHx 0 OOOHx OOVHx 1 OSHx DTOLx 0 OOOLx OOVLx 1 OSLx The fields OSHx and OSLx in the PWM Output Selection Register (PWM_OS) allow the outputs of the dead-time generator DTOHx and DTOLx to be overridden by the value defined in the fields OOVHx and OOVLx in the PWM Output Override Value Register (PWM_OOV). The set registers PWM Output Selection Set Register (PWM_OSS) and PWM Output Selection Set Update Register (PWM_OSSUPD) enable the override of the outputs of a channel regardless of other channels. In the same way, the clear registers PWM Output Selection Clear Register (PWM_OSC) and PWM Output Selection Clear Update Register (PWM_OSCUPD) disable the override of the outputs of a channel regardless of other channels. By using buffer registers PWM_OSSUPD and PWM_OSCUPD, the output selection of PWM outputs is done synchronously to the channel counter, at the beginning of the next PWM period. By using registers PWM_OSS and PWM_OSC, the output selection of PWM outputs is done asynchronously to the channel counter, as soon as the register is written. The value of the current output selection can be read in PWM_OS. While overriding PWM outputs, the channel counters continue to run, only the PWM outputs are forced to user defined values. 964 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.6.2.6 Fault Protection 8 inputs provide fault protection which can force any of the PWM output pairs to a programmable value. This mechanism has priority over output overriding. Figure 39-9. Fault Protection 0 Glitch Filter fault input 0 FIV0 1 = 0 FMOD0 SET OUT Fault 0 Status FS0 FPEx[0] CLR FPE0[0] FFIL0 0 Glitch Filter fault input 1 1 Write FCLR0 at 1 FPOL0 FIV1 = FMOD0 0 FMOD1 SET OUT Fault 1 Status FS1 FPEx[1] FPE0[1] FPOL1 Write FCLR1 at 1 0 1 SYNCx from fault 1 1 CLR FFIL1 from fault 0 1 FMOD1 From Output Override OOHx 0 FPVHx 1 PWMHx 0 Fault protection on PWM channel x 1 from fault y SYNCx fault input y FPVLx 1 OOLx From Output Override 0 PWMLx The polarity level of the fault inputs is configured by the FPOL field in the PWM Fault Mode Register (PWM_FMR). For fault inputs coming from internal peripherals such as ADC or Timer Counter, the polarity level must be FPOL = 1. For fault inputs coming from external GPIO pins the polarity level depends on the user's implementation. The configuration of the Fault Activation mode (FMOD field in PWMC_FMR) depends on the peripheral generating the fault. If the corresponding peripheral does not have "Fault Clear" management, then the FMOD configuration to use must be FMOD = 1, to avoid spurious fault detection. Refer to the corresponding peripheral documentation for details on handling fault generation. Fault inputs may or may not be glitch-filtered depending on the FFIL field in the PWM_FMR. When the filter is activated, glitches on fault inputs with a width inferior to the PWM peripheral clock period are rejected. A fault becomes active as soon as its corresponding fault input has a transition to the programmed polarity level. If the corresponding bit FMOD is set to `0' in the PWM_FMR, the fault remains active as long as the fault input is at this polarity level. If the corresponding FMOD field is set to `1', the fault remains active until the fault input is no longer at this polarity level and until it is cleared by writing the corresponding bit FCLR in the PWM Fault Clear Register (PWM_FCR). In the PWM Fault Status Register (PWM_FSR), the field FIV indicates the current level of the fault inputs and the field FIS indicates whether a fault is currently active. Each fault can be taken into account or not by the fault protection mechanism in each channel. To be taken into account in the channel x, the fault y must be enabled by the bit FPEx[y] in the PWM Fault Protection Enable registers (PWM_FPE1). However, synchronous channels (see Section 39.6.2.7 "Synchronous Channels") do not use their own fault enable bits, but those of the channel 0 (bits FPE0[y]). The fault protection on a channel is triggered when this channel is enabled and when any one of the faults that are enabled for this channel is active. It can be triggered even if the PWM peripheral clock is not running but only by a fault input that is not glitch-filtered. When the fault protection is triggered on a channel, the fault protection mechanism resets the counter of this channel and forces the channel outputs to the values defined by the fields FPVHx and FPVLx in the PWM Fault Protection Value Register (PWM_FPV) . The output forcing is made asynchronously to the channel counter. CAUTION: To prevent any unexpected activation of the status flag FSy in the PWM_FSR, the FMODy bit can be set to `1' only if the FPOLy bit has been previously configured to its final value. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 965 To prevent any unexpected activation of the Fault Protection on the channel x, the bit FPEx[y] can be set to `1' only if the FPOLy bit has been previously configured to its final value. If a comparison unit is enabled (see Section 39.6.3 "PWM Comparison Units") and if a fault is triggered in the channel 0, then the comparison cannot match. As soon as the fault protection is triggered on a channel, an interrupt (different from the interrupt generated at the end of the PWM period) can be generated but only if it is enabled and not masked. The interrupt is reset by reading the interrupt status register, even if the fault which has caused the trigger of the fault protection is kept active. 39.6.2.7 Synchronous Channels Some channels can be linked together as synchronous channels. They have the same source clock, the same period, the same alignment and are started together. In this way, their counters are synchronized together. The synchronous channels are defined by the SYNCx bits in the PWM Sync Channels Mode Register (PWM_SCM). Only one group of synchronous channels is allowed. When a channel is defined as a synchronous channel, the channel 0 is also automatically defined as a synchronous channel. This is because the channel 0 counter configuration is used by all the synchronous channels. If a channel x is defined as a synchronous channel, the fields/bits for the channel 0 are used instead of those of channel x: CPRE in PWM_CMR0 instead of CPRE in PWM_CMRx (same source clock) CPRD in PWM_CPRD0 instead of CPRD in PWM_CPRDx (same period) CALG in PWM_CMR0 instead of CALG in PWM_CMRx (same alignment) Modifying the fields CPRE, CPRD and CALG of for channels with index greater than 0 has no effect on output waveforms. Because counters of synchronous channels must start at the same time, they are all enabled together by enabling the channel 0 (by the CHID0 bit in PWM_ENA register). In the same way, they are all disabled together by disabling channel 0 (by the CHID0 bit in PWM_DIS register). However, a synchronous channel x different from channel 0 can be enabled or disabled independently from others (by the CHIDx bit in PWM_ENA and PWM_DIS registers). Defining a channel as a synchronous channel while it is an asynchronous channel (by writing the bit SYNCx to `1' while it was at `0') is allowed only if the channel is disabled at this time (CHIDx = 0 in PWM_SR). In the same way, defining a channel as an asynchronous channel while it is a synchronous channel (by writing the SYNCx bit to `0' while it was `1') is allowed only if the channel is disabled at this time. The UPDM field (Update Mode) in the PWM_SCM register selects one of the three methods to update the registers of the synchronous channels: 966 Method 1 (UPDM = 0): The period value, the duty-cycle values and the dead-time values must be written by the processor in their respective update registers (respectively PWM_CPRDUPDx, PWM_CDTYUPDx and PWM_DTUPDx).The update is triggered at the next PWM period as soon as the bit UPDULOCK in the PWM Sync Channels Update Control Register (PWM_SCUC) is set to `1' (see "Method 1: Manual write of dutycycle values and manual trigger of the update" ). Method 2 (UPDM = 1): The period value, the duty-cycle values, the dead-time values and the update period value must be written by the processor in their respective update registers (respectively PWM_CPRDUPDx, PWM_CDTYUPDx and PWM_DTUPD). The update of the period value and of the dead-time values is triggered at the next PWM period as soon as the bit UPDULOCK in the PWM_SCUC register is set to `1'. The update of the duty-cycle values and the update period value is triggered automatically after an update period defined by the field UPR in the PWM Sync Channels Update Period Register (PWM_SCUP) (see "Method 2: Manual write of duty-cycle values and automatic trigger of the update" ). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 39-5. Method 3 (UPDM = 2): Same as Method 2 apart from the fact that the duty-cycle values of ALL synchronous channels are written by the Peripheral DMA Controller (see "Method 3: Automatic write of duty-cycle values and automatic trigger of the update" ). The user can choose to synchronize the Peripheral DMA Controller transfer request with a comparison match (see Section 39.6.3 "PWM Comparison Units"), by the fields PTRM and PTRCS in the PWM_SCM register. Summary of the Update of Registers of Synchronous Channels Register UPDM = 0 UPDM = 1 UPDM = 2 Write by the processor Period Value (PWM_CPRDUPDx) Update is triggered at the next PWM period as soon as the bit UPDULOCK is set to `1' Write by the processor Dead-Time Values (PWM_DTUPDx) Update is triggered at the next PWM period as soon as the bit UPDULOCK is set to `1' Write by the processor Duty-Cycle Values (PWM_CDTYUPDx) Write by the processor Write by the Peripheral DMA Controller Update is triggered at the next PWM period as soon as the bit UPDULOCK is set to `1' Update is triggered at the next PWM period as soon as the update period counter has reached the value UPR Not applicable Write by the processor Not applicable Update is triggered at the next PWM period as soon as the update period counter has reached the value UPR Update Period Value (PWM_SCUPUPD) Method 1: Manual write of duty-cycle values and manual trigger of the update In this mode, the update of the period value, the duty-cycle values and the dead-time values must be done by writing in their respective update registers with the processor (respectively PWM_CPRDUPDx, PWM_CDTYUPDx and PWM_DTUPDx). To trigger the update, the user must use the bit UPDULOCK in the PWM_SCUC register which allows to update synchronously (at the same PWM period) the synchronous channels: If the bit UPDULOCK is set to `1', the update is done at the next PWM period of the synchronous channels. If the UPDULOCK bit is not set to `1', the update is locked and cannot be performed. After writing the UPDULOCK bit to `1', it is held at this value until the update occurs, then it is read 0. Sequence for Method 1: 1. Select the manual write of duty-cycle values and the manual update by setting the UPDM field to `0' in the PWM_SCM register 2. Define the synchronous channels by the SYNCx bits in the PWM_SCM register. 3. Enable the synchronous channels by writing CHID0 in the PWM_ENA register. 4. If an update of the period value and/or the duty-cycle values and/or the dead-time values is required, write registers that need to be updated (PWM_CPRDUPDx, PWM_CDTYUPDx and PWM_DTUPDx). 5. Set UPDULOCK to `1' in PWM_SCUC. 6. The update of the registers will occur at the beginning of the next PWM period. When the UPDULOCK bit is reset, go to Step 4. for new values. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 967 Figure 39-10. Method 1 (UPDM = 0) CCNT0 CDTYUPD 0x20 0x40 0x20 0x40 0x60 UPDULOCK CDTY 0x60 Method 2: Manual write of duty-cycle values and automatic trigger of the update In this mode, the update of the period value, the duty-cycle values, the dead-time values and the update period value must be done by writing in their respective update registers with the processor (respectively PWM_CPRDUPDx, PWM_CDTYUPDx, PWM_DTUPDx and PWM_SCUPUPD). To trigger the update of the period value and the dead-time values, the user must use the bit UPDULOCK in the PWM_SCUC register, which updates synchronously (at the same PWM period) the synchronous channels: If the bit UPDULOCK is set to `1', the update is done at the next PWM period of the synchronous channels. If the UPDULOCK bit is not set to `1', the update is locked and cannot be performed. After writing the UPDULOCK bit to `1', it is held at this value until the update occurs, then it is read 0. The update of the duty-cycle values and the update period is triggered automatically after an update period. To configure the automatic update, the user must define a value for the update period by the UPR field in the PWM_SCUP register. The PWM controller waits UPR+1 period of synchronous channels before updating automatically the duty values and the update period value. The status of the duty-cycle value write is reported in the PWM Interrupt Status Register 2 (PWM_ISR2) by the following flags: WRDY: this flag is set to `1' when the PWM Controller is ready to receive new duty-cycle values and a new update period value. It is reset to `0' when the PWM_ISR2 register is read. Depending on the interrupt mask in the PWM Interrupt Mask Register 2 (PWM_IMR2), an interrupt can be generated by these flags. Sequence for Method 2: 1. Select the manual write of duty-cycle values and the automatic update by setting the field UPDM to `1' in the PWM_SCM register 968 2. Define the synchronous channels by the bits SYNCx in the PWM_SCM register. 3. Define the update period by the field UPR in the PWM_SCUP register. 4. Enable the synchronous channels by writing CHID0 in the PWM_ENA register. 5. If an update of the period value and/or of the dead-time values is required, write registers that need to be updated (PWM_CPRDUPDx, PWM_DTUPDx), else go to Step 8. 6. Set UPDULOCK to `1' in PWM_SCUC. 7. The update of these registers will occur at the beginning of the next PWM period. At this moment the bit UPDULOCK is reset, go to Step 5. for new values. 8. If an update of the duty-cycle values and/or the update period is required, check first that write of new update values is possible by polling the flag WRDY (or by waiting for the corresponding interrupt) in the PWM_ISR2. 9. Write registers that need to be updated (PWM_CDTYUPDx, PWM_SCUPUPD). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 10. The update of these registers will occur at the next PWM period of the synchronous channels when the Update Period is elapsed. Go to Step 8. for new values. Figure 39-11. Method 2 (UPDM = 1) CCNT0 CDTYUPD UPRUPD 0x1 UPR 0x1 UPRCNT 0x0 CDTY 0x20 0x60 0x40 0x20 0x3 0x3 0x1 0x0 0x1 0x0 0x1 0x0 0x1 0x2 0x40 0x3 0x0 0x1 0x2 0x60 WRDY Method 3: Automatic write of duty-cycle values and automatic trigger of the update In this mode, the update of the duty cycle values is made automatically by the Peripheral DMA Controller. The update of the period value, the dead-time values and the update period value must be done by writing in their respective update registers with the processor (respectively PWM_CPRDUPDx, PWM_DTUPDx and PWM_SCUPUPD). To trigger the update of the period value and the dead-time values, the user must use the bit UPDULOCK which allows to update synchronously (at the same PWM period) the synchronous channels: If the bit UPDULOCK is set to `1', the update is done at the next PWM period of the synchronous channels. If the UPDULOCK bit is not set to `1', the update is locked and cannot be performed. After writing the UPDULOCK bit to `1', it is held at this value until the update occurs, then it is read 0. The update of the duty-cycle values and the update period value is triggered automatically after an update period. To configure the automatic update, the user must define a value for the Update Period by the field UPR in the PWM_SCUP register. The PWM controller waits UPR+1 periods of synchronous channels before updating automatically the duty values and the update period value. Using the Peripheral DMA Controller removes processor overhead by reducing its intervention during the transfer. This significantly reduces the number of clock cycles required for a data transfer, which improves microcontroller performance. The Peripheral DMA Controller must write the duty-cycle values in the synchronous channels index order. For example if the channels 0, 1 and 3 are synchronous channels, the Peripheral DMA Controller must write the dutycycle of the channel 0 first, then the duty-cycle of the channel 1, and finally the duty-cycle of the channel 3. The status of the Peripheral DMA Controller transfer is reported in the PWM_ISR2 by the following flags: WRDY: this flag is set to `1' when the PWM Controller is ready to receive new duty-cycle values and a new update period value. It is reset to `0' when the PWM_ISR2 is read. The user can choose to synchronize the WRDY flag and the Peripheral DMA Controller transfer request with a comparison match (see Section 39.6.3 "PWM Comparison Units"), by the fields PTRM and PTRCS in the PWM_SCM register. ENDTX : this flag is set to `1' when a PDC transfer is completed TXBUFE : this flag is set to `1' when the PDC buffer is empty (no pending PDC transfers) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 969 UNRE: this flag is set to `1' when the update period defined by the UPR field has elapsed while the whole data has not been written by the Peripheral DMA Controller. It is reset to `0' when the PWM_ISR2 is read. Depending on the interrupt mask in the PWM_IMR2, an interrupt can be generated by these flags. Sequence for Method 3: 1. Select the automatic write of duty-cycle values and automatic update by setting the field UPDM to 2 in the PWM_SCM register. 2. Define the synchronous channels by the bits SYNCx in the PWM_SCM register. 3. Define the update period by the field UPR in the PWM_SCUP register. 4. Define when the WRDY flag and the corresponding Peripheral DMA Controller transfer request must be set in the update period by the PTRM bit and the PTRCS field in the PWM_SCM register (at the end of the update period or when a comparison matches). 5. Define the Peripheral DMA Controller transfer settings for the duty-cycle values and enable it in the Peripheral DMA Controller registers 6. Enable the synchronous channels by writing CHID0 in the PWM_ENA register. 7. If an update of the period value and/or of the dead-time values is required, write registers that need to be updated (PWM_CPRDUPDx, PWM_DTUPDx), else go to Step 10. 8. Set UPDULOCK to `1' in PWM_SCUC. 9. The update of these registers will occur at the beginning of the next PWM period. At this moment the bit UPDULOCK is reset, go to Step 7. for new values. 10. If an update of the update period value is required, check first that write of a new update value is possible by polling the flag WRDY (or by waiting for the corresponding interrupt) in the PWM_ISR2, else go to Step 13. 11. Write the register that needs to be updated (PWM_SCUPUPD). 12. The update of this register will occur at the next PWM period of the synchronous channels when the Update Period is elapsed. Go to Step 10. for new values. 13. Check the end of the PDC transfer by the flag ENDTX. If the transfer has ended, define a new PDC transfer in the PDC registers for new duty-cycle values. Go to Step 5. Figure 39-12. Method 3 (UPDM = 2 and PTRM = 0) CCNT0 CDTYUPD UPRUPD 0x1 UPR 0x1 UPRCNT 0x0 CDTY 0x80 0xB0 0xA0 0x3 0x3 0x1 0x0 0x20 transfer request WRDY 970 0x60 0x40 0x20 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 0x1 0x0 0x40 0x1 0x0 0x60 0x1 0x2 0x80 0x3 0x0 0x1 0x2 0xA0 Figure 39-13. Method 3 (UPDM = 2 and PTRM = 1 and PTRCS = 0) CCNT0 CDTYUPD 0x20 UPRUPD 0x1 UPR 0x1 UPRCNT 0x0 CDTY 0x60 0x40 0x80 0xB0 0xA0 0x3 0x3 0x1 0x0 0x1 0x40 0x20 0x0 0x1 0x1 0x0 0x80 0x60 0x2 0x3 0x0 0x1 0x2 0xA0 CMP0 match transfer request WRDY 39.6.3 PWM Comparison Units The PWM provides 8 independent comparison units able to compare a programmed value with the current value of the channel 0 counter (which is the channel counter of all synchronous channels, Section 39.6.2.7 "Synchronous Channels"). These comparisons are intended to generate pulses on the event lines (used to synchronize ADC, see Section 39.6.4 "PWM Event Lines"), to generate software interrupts and to trigger Peripheral DMA Controller transfer requests for the synchronous channels (see "Method 3: Automatic write of duty-cycle values and automatic trigger of the update" ). Figure 39-14. Comparison Unit Block Diagram CEN [PWM_CMPMx] fault on channel 0 CV [PWM_CMPVx] CNT [PWM_CCNT0] Comparison x = 1 CNT [PWM_CCNT0] is decrementing = 0 1 CVM [PWM_CMPVx] CALG [PWM_CMR0] CPRCNT [PWM_CMPMx] CTR [PWM_CMPMx] = The comparison x matches when it is enabled by the bit CEN in the PWM Comparison x Mode Register (PWM_CMPMx for the comparison x) and when the counter of the channel 0 reaches the comparison value defined by the field CV in PWM Comparison x Value Register (PWM_CMPVx for the comparison x). If the counter SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 971 of the channel 0 is center-aligned (CALG = 1 in PWM Channel Mode Register), the bit CVM in PWM_CMPVx defines if the comparison is made when the counter is counting up or counting down (in Left-alignment mode CALG = 0, this bit is useless). If a fault is active on the channel 0, the comparison is disabled and cannot match (see Section 39.6.2.6 "Fault Protection"). The user can define the periodicity of the comparison x by the fields CTR and CPR in PWM_CMPMx. The comparison is performed periodically once every CPR+1 periods of the counter of the channel 0, when the value of the comparison period counter CPRCNT in PWM_CMPMx reaches the value defined by CTR. CPR is the maximum value of the comparison period counter CPRCNT. If CPR = CTR = 0, the comparison is performed at each period of the counter of the channel 0. The comparison x configuration can be modified while the channel 0 is enabled by using the PWM Comparison x Mode Update Register (PWM_CMPMUPDx registers for the comparison x). In the same way, the comparison x value can be modified while the channel 0 is enabled by using the PWM Comparison x Value Update Register (PWM_CMPVUPDx registers for the comparison x). The update of the comparison x configuration and the comparison x value is triggered periodically after the comparison x update period. It is defined by the field CUPR in the PWM_CMPMx. The comparison unit has an update period counter independent from the period counter to trigger this update. When the value of the comparison update period counter CUPRCNT (in PWM_CMPMx) reaches the value defined by CUPR, the update is triggered. The comparison x update period CUPR itself can be updated while the channel 0 is enabled by using the PWM_CMPMUPDx register. CAUTION: The write of PWM_CMPVUPDx must be followed by a write of PWM_CMPMUPDx. The comparison match and the comparison update can be source of an interrupt, but only if it is enabled and not masked. These interrupts can be enabled by the PWM Interrupt Enable Register 2 and disabled by the PWM Interrupt Disable Register 2. The comparison match interrupt and the comparison update interrupt are reset by reading the PWM Interrupt Status Register 2. 972 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 39-15. Comparison Waveform CCNT0 CVUPD 0x6 0x6 0x2 CVMVUPD CTRUPD 0x1 0x2 CPRUPD 0x1 0x3 CUPRUPD 0x3 0x2 CV 0x6 0x2 CTR 0x1 0x2 CPR 0x1 0x3 CUPR 0x3 0x2 CUPRCNT 0x0 0x1 0x2 0x3 0x0 0x1 0x2 0x0 0x1 0x2 0x0 0x1 CPRCNT 0x0 0x1 0x0 0x1 0x0 0x1 0x2 0x3 0x0 0x1 0x2 0x3 0x6 CVM Comparison Update CMPU Comparison Match CMPM 39.6.4 PWM Event Lines The PWM provides 2 independent event lines intended to trigger actions in other peripherals (e.g., for the Analogto-Digital Converter (ADC)). A pulse (one cycle of the peripheral clock) is generated on an event line, when at least one of the selected comparisons is matching. The comparisons can be selected or unselected independently by the CSEL bits in the PWM Event Line x Register (PWM_ELMRx for the Event Line x). An example of event generation is provided in Figure 39-17. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 973 Figure 39-16. Event Line Block Diagram CMPM0 (PWM_ISR2) CSEL0 (PWM_ELMRx) CMPM1 (PWM_ISR2) CSEL1 (PWM_ELMRx) CMPM2 (PWM_ISR2) CSEL2 (PWM_ELMRx) PULSE GENERATOR Event Line x CMPM7 (PWM_ISR2) CSEL7 (PWM_ELMRx) Figure 39-17. Event Line Generation Waveform (Example) PWM_CCNTx CPRD(PWM_CPRD0) CV (PWM_CMPV1) CDTY(PWM_CDTY2) CDTY(PWM_CDTY1) CDTY(PWM_CDTY0) CV (PWM_CMPV0) Waveform OC0 Waveform OC1 Waveform OC2 Comparison Unit 0 Output PWM_CMPM0.CEN = 1 Comparison Unit 1 Output PWM_CMPM0.CEN = 1 Event Line 0 (trigger event for ADC) PWM_ELMR0.CSEL0 = 1 PWM_ELMR0.CSEL1 = 1 configurable delay PWM_CMPV0.CV ADC conversion configurable delay PWM_CMPV1.CV ADC conversion 39.6.5 PWM Controller Operations 39.6.5.1 Initialization Before enabling the channels, they must be configured by the software application as described below: 974 Unlock User Interface by writing the WPCMD field in the PWM_WPCR. Configuration of the clock generator (DIVA, PREA, DIVB, PREB in the PWM_CLK register if required). Selection of the clock for each channel (CPRE field in PWM_CMRx) Configuration of the waveform alignment for each channel (CALG field in PWM_CMRx) Selection of the counter event selection (if CALG = 1) for each channel (CES field in PWM_CMRx) Configuration of the output waveform polarity for each channel (CPOL bit in PWM_CMRx) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Configuration of the period for each channel (CPRD in the PWM_CPRDx register). Writing in PWM_CPRDx register is possible while the channel is disabled. After validation of the channel, the user must use PWM_CPRDUPDx register to update PWM_CPRDx as explained below. Configuration of the duty-cycle for each channel (CDTY in the PWM_CDTYx register). Writing in PWM_CDTYx register is possible while the channel is disabled. After validation of the channel, the user must use PWM_CDTYUPDx register to update PWM_CDTYx as explained below. Configuration of the dead-time generator for each channel (DTH and DTL in PWM_DTx) if enabled (DTE bit in the PWM_CMRx). Writing in the PWM_DTx register is possible while the channel is disabled. After validation of the channel, the user must use PWM_DTUPDx register to update PWM_DTx Selection of the synchronous channels (SYNCx in the PWM_SCM register) Selection of the moment when the WRDY flag and the corresponding Peripheral DMA Controller transfer request are set (PTRM and PTRCS in the PWM_SCM register) Configuration of the Update mode (UPDM in PWM_SCM register) Configuration of the update period (UPR in PWM_SCUP register) if needed Configuration of the comparisons (PWM_CMPVx and PWM_CMPMx) Configuration of the event lines (PWM_ELMRx) Configuration of the fault inputs polarity (FPOL in PWM_FMR) Configuration of the fault protection (FMOD and FFIL in PWM_FMR, PWM_FPV and PWM_FPE1) Enable of the interrupts (writing CHIDx and FCHIDx in PWM_IER1, and writing WRDYE, ENDTXE, TXBUFE, UNRE, CMPMx and CMPUx in PWM_IER2) Enable of the PWM channels (writing CHIDx in the PWM_ENA register) 39.6.5.2 Source Clock Selection Criteria The large number of source clocks can make selection difficult. The relationship between the value in the PWM Channel Period Register (PWM_CPRDx) and the PWM Channel Duty Cycle Register (PWM_CDTYx) helps the user select the appropriate clock. The event number written in the Period Register gives the PWM accuracy. The Duty-Cycle quantum cannot be lower than 1/CPRDx value. The higher the value of PWM_CPRDx, the greater the PWM accuracy. For example, if the user sets 15 (in decimal) in PWM_CPRDx, the user is able to set a value from between 1 up to 14 in PWM_CDTYx. The resulting duty-cycle quantum cannot be lower than 1/15 of the PWM period. 39.6.5.3 Changing the Duty-Cycle, the Period and the Dead-Times It is possible to modulate the output waveform duty-cycle, period and dead-times. To prevent unexpected output waveform, the user must use the PWM Channel Duty Cycle Update Register (PWM_CDTYUPDx), the PWM Channel Period Update Register (PWM_CPRDUPDx) and the PWM Channel Dead Time Update Register (PWM_DTUPDx) to change waveform parameters while the channel is still enabled. If the channel is an asynchronous channel (SYNCx = 0 in PWM Sync Channels Mode Register (PWM_SCM)), these registers hold the new period, duty-cycle and dead-times values until the end of the current PWM period and update the values for the next period. If the channel is a synchronous channel and update method 0 is selected (SYNCx = 1 and UPDM = 0 in PWM_SCM register), these registers hold the new period, duty-cycle and dead-times values until the bit UPDULOCK is written at `1' (in PWM Sync Channels Update Control Register (PWM_SCUC)) and the end of the current PWM period, then update the values for the next period. If the channel is a synchronous channel and update method 1 or 2 is selected (SYNCx = 1 and UPDM = 1 or 2 in PWM_SCM register): registers PWM_CPRDUPDx and PWM_DTUPDx hold the new period and dead-times values until the bit UPDULOCK is written at `1' (in PWM_SCUC) and the end of the current PWM period, then update the values for the next period. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 975 Note: register PWM_CDTYUPDx holds the new duty-cycle value until the end of the update period of synchronous channels (when UPRCNT is equal to UPR in PWM Sync Channels Update Period Register (PWM_SCUP)) and the end of the current PWM period, then updates the value for the next period. If the update registers PWM_CDTYUPDx, PWM_CPRDUPDx and PWM_DTUPDx are written several times between two updates, only the last written value is taken into account. Figure 39-18. Synchronized Period, Duty-Cycle and Dead-Time Update User's Writing User's Writing User's Writing PWM_DTUPDx Value PWM_CPRDUPDx Value PWM_CDTYUPDx Value PWM_CPRDx PWM_DTx PWM_CDTYx - If Asynchronous Channel -> End of PWM period - If Synchronous Channel -> End of PWM period and UPDULOCK = 1 - If Asynchronous Channel -> End of PWM period - If Synchronous Channel - If UPDM = 0 -> End of PWM period and UPDULOCK = 1 - If UPDM = 1 or 2 -> End of PWM period and end of Update Period 39.6.5.4 Changing the Update Period of Synchronous Channels It is possible to change the update period of synchronous channels while they are enabled. See "Method 2: Manual write of duty-cycle values and automatic trigger of the update" and "Method 3: Automatic write of dutycycle values and automatic trigger of the update" . To prevent an unexpected update of the synchronous channels registers, the user must use the PWM Sync Channels Update Period Update Register (PWM_SCUPUPD) to change the update period of synchronous channels while they are still enabled. This register holds the new value until the end of the update period of synchronous channels (when UPRCNT is equal to UPR in PWM_SCUP) and the end of the current PWM period, then updates the value for the next period. Note: Note: 976 If the update register PWM_SCUPUPD is written several times between two updates, only the last written value is taken into account. Changing the update period does make sense only if there is one or more synchronous channels and if the update method 1 or 2 is selected (UPDM = 1 or 2 in PWM Sync Channels Mode Register). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 39-19. Synchronized Update of Update Period Value of Synchronous Channels User's Writing PWM_SCUPUPD Value PWM_SCUP End of PWM period and end of update period of synchronous channels 39.6.5.5 Changing the Comparison Value and the Comparison Configuration It is possible to change the comparison values and the comparison configurations while the channel 0 is enabled (see Section 39.6.3 "PWM Comparison Units"). To prevent unexpected comparison match, the user must use the PWM Comparison x Value Update Register (PWM_CMPVUPDx) and the PWM Comparison x Mode Update Register (PWM_CMPMUPDx) to change, respectively, the comparison values and the comparison configurations while the channel 0 is still enabled. These registers hold the new values until the end of the comparison update period (when CUPRCNT is equal to CUPR in PWM Comparison x Mode Register (PWM_CMPMx) and the end of the current PWM period, then update the values for the next period. CAUTION: The write of the register PWM_CMPVUPDx must be followed by a write of the register PWM_CMPMUPDx. Note: If the update registers PWM_CMPVUPDx and PWM_CMPMUPDx are written several times between two updates, only the last written value are taken into account. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 977 Figure 39-20. Synchronized Update of Comparison Values and Configurations User's Writing User's Writing PWM_CMPVUPDx Value Comparison value for comparison x PWM_CMPMUPDx Value Comparison configuration for comparison x PWM_CMPVx PWM_CMPMx End of channel0 PWM period and end of comparison update period and and PWM_CMPMx written End of channel0 PWM period and end of comparison update period 39.6.5.6 Interrupts Depending on the interrupt mask in the PWM_IMR1 and PWM_IMR2, an interrupt can be generated at the end of the corresponding channel period (CHIDx in the PWM Interrupt Status Register 1 (PWM_ISR1)), after a fault event (FCHIDx in the PWM_ISR1), after a comparison match (CMPMx in the PWM_ISR2), after a comparison update (CMPUx in the PWM_ISR2) or according to the Transfer mode of the synchronous channels (WRDY, ENDTX, TXBUFE and UNRE in the PWM_ISR2). If the interrupt is generated by the flags CHIDx or FCHIDx, the interrupt remains active until a read operation in the PWM_ISR1 occurs. If the interrupt is generated by the flags WRDY or UNRE or CMPMx or CMPUx, the interrupt remains active until a read operation in the PWM_ISR2 occurs. A channel interrupt is enabled by setting the corresponding bit in PWM_IER1 and PWM_IER2. A channel interrupt is disabled by setting the corresponding bit in PWM_IDR1 and PWM_IDR2. 978 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.6.6 Register Write Protection To prevent any single software error that may corrupt PWM behavior, the registers listed below can be writeprotected by writing the field WPCMD in the PWM Write Protection Control Register (PWM_WPCR). They are divided into six groups: Register group 0: Register group 1: PWM Clock Register PWM Disable Register Register group 2: PWM Sync Channels Mode Register PWM Channel Mode Register PWM Stepper Motor Mode Register Register group 3: PWM Channel Period Register PWM Channel Period Update Register Register group 4: PWM Channel Dead Time Register PWM Channel Dead Time Update Register Register group 5: PWM Fault Mode Register PWM Fault Protection Value Register There are two types of write protection: SW write protection--can be enabled or disabled by software HW write protection--can be enabled by software but only disabled by a hardware reset of the PWM controller Both types of write protection can be applied independently to a particular register group by means of the WPCMD and WPRGx fields in the PWM_WPCR. If at least one type of write protection is active, the register group is writeprotected. The value of field WPCMD defines the action to be performed: 0: Disables SW write protection of the register groups of which the bit WPRGx is at `1' 1: Enables SW write protection of the register groups of which the bit WPRGx is at `1' 2: Enables HW write protection of the register groups of which the bit WPRGx is at `1' At any time, the user can determine whether SW or HW write protection is active in a particular register group by the fields WPSWS and WPHWS in the PWM Write Protection Status Register (PWM_WPSR). If a write access to a write-protected register is detected, the WPVS flag in the PWM_WPSR is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS and WPVSRC fields are automatically cleared after reading the PWM_WPSR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 979 39.7 Pulse Width Modulation Controller (PWM) User Interface Table 39-6. Register Mapping Offset Register Name Access Reset 0x00 PWM Clock Register PWM_CLK Read/Write 0x0 0x04 PWM Enable Register PWM_ENA Write-only - 0x08 PWM Disable Register PWM_DIS Write-only - 0x0C PWM Status Register PWM_SR Read-only 0x0 0x10 PWM Interrupt Enable Register 1 PWM_IER1 Write-only - 0x14 PWM Interrupt Disable Register 1 PWM_IDR1 Write-only - 0x18 PWM Interrupt Mask Register 1 PWM_IMR1 Read-only 0x0 0x1C PWM Interrupt Status Register 1 PWM_ISR1 Read-only 0x0 0x20 PWM Sync Channels Mode Register PWM_SCM Read/Write 0x0 0x24 Reserved - - - 0x28 PWM Sync Channels Update Control Register PWM_SCUC Read/Write 0x0 0x2C PWM Sync Channels Update Period Register PWM_SCUP Read/Write 0x0 0x30 PWM Sync Channels Update Period Update Register PWM_SCUPUPD Write-only - 0x34 PWM Interrupt Enable Register 2 PWM_IER2 Write-only - 0x38 PWM Interrupt Disable Register 2 PWM_IDR2 Write-only - 0x3C PWM Interrupt Mask Register 2 PWM_IMR2 Read-only 0x0 0x40 PWM Interrupt Status Register 2 PWM_ISR2 Read-only 0x0 0x44 PWM Output Override Value Register PWM_OOV Read/Write 0x0 0x48 PWM Output Selection Register PWM_OS Read/Write 0x0 0x4C PWM Output Selection Set Register PWM_OSS Write-only - 0x50 PWM Output Selection Clear Register PWM_OSC Write-only - 0x54 PWM Output Selection Set Update Register PWM_OSSUPD Write-only - 0x58 PWM Output Selection Clear Update Register PWM_OSCUPD Write-only - 0x5C PWM Fault Mode Register PWM_FMR Read/Write 0x0 0x60 PWM Fault Status Register PWM_FSR Read-only 0x0 0x64 PWM Fault Clear Register PWM_FCR Write-only - 0x68 PWM Fault Protection Value Register PWM_FPV Read/Write 0x0 0x6C PWM Fault Protection Enable Register PWM_FPE Read/Write 0x0 0x70-0x78 Reserved - - - 0x7C PWM Event Line 0 Mode Register PWM_ELMR0 Read/Write 0x0 0x80 PWM Event Line 1 Mode Register PWM_ELMR1 Read/Write 0x0 0x84-0x9C Reserved - - - 0xA0-0xAC Reserved - - - 0xB0 PWM Stepper Motor Mode Register PWM_SMMR Read/Write 0x0 0xB4-0xBC Reserved - - - 980 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 39-6. Register Mapping (Continued) Offset Register Name Access Reset 0xC0-0xE0 Reserved - - - 0xE4 PWM Write Protection Control Register PWM_WPCR Write-only - 0xE8 PWM Write Protection Status Register PWM_WPSR Read-only 0x0 0xEC-0xFC Reserved - - - 0x100-0x128 Reserved for PDC registers - - - 0x12C Reserved - - - 0x130 PWM Comparison 0 Value Register PWM_CMPV0 Read/Write 0x0 0x134 PWM Comparison 0 Value Update Register PWM_CMPVUPD0 Write-only - 0x138 PWM Comparison 0 Mode Register PWM_CMPM0 Read/Write 0x0 0x13C PWM Comparison 0 Mode Update Register PWM_CMPMUPD0 Write-only - 0x140 PWM Comparison 1 Value Register PWM_CMPV1 Read/Write 0x0 0x144 PWM Comparison 1 Value Update Register PWM_CMPVUPD1 Write-only - 0x148 PWM Comparison 1 Mode Register PWM_CMPM1 Read/Write 0x0 0x14C PWM Comparison 1 Mode Update Register PWM_CMPMUPD1 Write-only - 0x150 PWM Comparison 2 Value Register PWM_CMPV2 Read/Write 0x0 0x154 PWM Comparison 2 Value Update Register PWM_CMPVUPD2 Write-only - 0x158 PWM Comparison 2 Mode Register PWM_CMPM2 Read/Write 0x0 0x15C PWM Comparison 2 Mode Update Register PWM_CMPMUPD2 Write-only - 0x160 PWM Comparison 3 Value Register PWM_CMPV3 Read/Write 0x0 0x164 PWM Comparison 3 Value Update Register PWM_CMPVUPD3 Write-only - 0x168 PWM Comparison 3 Mode Register PWM_CMPM3 Read/Write 0x0 0x16C PWM Comparison 3 Mode Update Register PWM_CMPMUPD3 Write-only - 0x170 PWM Comparison 4 Value Register PWM_CMPV4 Read/Write 0x0 0x174 PWM Comparison 4 Value Update Register PWM_CMPVUPD4 Write-only - 0x178 PWM Comparison 4 Mode Register PWM_CMPM4 Read/Write 0x0 0x17C PWM Comparison 4 Mode Update Register PWM_CMPMUPD4 Write-only - 0x180 PWM Comparison 5 Value Register PWM_CMPV5 Read/Write 0x0 0x184 PWM Comparison 5 Value Update Register PWM_CMPVUPD5 Write-only - 0x188 PWM Comparison 5 Mode Register PWM_CMPM5 Read/Write 0x0 0x18C PWM Comparison 5 Mode Update Register PWM_CMPMUPD5 Write-only - 0x190 PWM Comparison 6 Value Register PWM_CMPV6 Read/Write 0x0 0x194 PWM Comparison 6 Value Update Register PWM_CMPVUPD6 Write-only - 0x198 PWM Comparison 6 Mode Register PWM_CMPM6 Read/Write 0x0 0x19C PWM Comparison 6 Mode Update Register PWM_CMPMUPD6 Write-only - 0x1A0 PWM Comparison 7 Value Register PWM_CMPV7 Read/Write 0x0 0x1A4 PWM Comparison 7 Value Update Register PWM_CMPVUPD7 Write-only - 0x1A8 PWM Comparison 7 Mode Register PWM_CMPM7 Read/Write 0x0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 981 Table 39-6. Register Mapping (Continued) Offset Register Name Access Reset 0x1AC PWM Comparison 7 Mode Update Register PWM_CMPMUPD7 Write-only - 0x1B0-0x1FC Reserved - - - 0x200 + ch_num * 0x20 + 0x00 PWM Channel Mode Register(1) PWM_CMR Read/Write 0x0 0x200 + ch_num * 0x20 + 0x04 PWM Channel Duty Cycle Register(1) PWM_CDTY Read/Write 0x0 0x200 + ch_num * 0x20 + 0x08 PWM Channel Duty Cycle Update Register(1) PWM_CDTYUPD Write-only - 0x200 + ch_num * 0x20 + 0x0C PWM Channel Period Register(1) PWM_CPRD Read/Write 0x0 0x200 + ch_num * 0x20 + 0x10 PWM Channel Period Update Register(1) PWM_CPRDUPD Write-only - 0x200 + ch_num * 0x20 + 0x14 PWM Channel Counter Register(1) PWM_CCNT Read-only 0x0 0x200 + ch_num * 0x20 + 0x18 PWM Channel Dead Time Register(1) PWM_DT Read/Write 0x0 Write-only - 0x200 + ch_num * PWM Channel Dead Time Update Register(1) PWM_DTUPD 0x20 + 0x1C Notes: 1. Some registers are indexed with "ch_num" index ranging from 0 to 3. 982 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.1 PWM Clock Register Name: PWM_CLK Address: 0x40020000 Access: Read/Write 31 - 30 - 29 - 28 - 27 26 23 22 21 20 19 18 11 10 25 24 17 16 9 8 1 0 PREB DIVB 15 - 14 - 13 - 12 - 7 6 5 4 PREA 3 2 DIVA This register can only be written if bits WPSWS0 and WPHWS0 are cleared in the PWM Write Protection Status Register. * DIVA: CLKA Divide Factor Value Name 0 CLKA_POFF 1 PREA 2-255 PREA_DIV Description CLKA clock is turned off CLKA clock is clock selected by PREA CLKA clock is clock selected by PREA divided by DIVA factor * DIVB: CLKB Divide Factor Value Name 0 CLKB_POFF 1 PREB 2-255 PREB_DIV Description CLKB clock is turned off CLKB clock is clock selected by PREB CLKB clock is clock selected by PREB divided by DIVB factor * PREA: CLKA Source Clock Selection Value Name Description 0 CLK 1 CLK_DIV2 Peripheral clock/2 2 CLK_DIV4 Peripheral clock/4 3 CLK_DIV8 Peripheral clock/8 4 CLK_DIV16 Peripheral clock/16 5 CLK_DIV32 Peripheral clock/32 6 CLK_DIV64 Peripheral clock/64 7 CLK_DIV128 Peripheral clock/128 8 CLK_DIV256 Peripheral clock/256 Peripheral clock SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 983 9 CLK_DIV512 Peripheral clock/512 10 CLK_DIV1024 Peripheral clock/1024 Other - Reserved * PREB: CLKB Source Clock Selection 984 Value Name 0 CLK 1 CLK_DIV2 Peripheral clock/2 2 CLK_DIV4 Peripheral clock/4 3 CLK_DIV8 Peripheral clock/8 4 CLK_DIV16 Peripheral clock/16 5 CLK_DIV32 Peripheral clock/32 6 CLK_DIV64 Peripheral clock/64 7 CLK_DIV128 Peripheral clock/128 8 CLK_DIV256 Peripheral clock/256 9 CLK_DIV512 Peripheral clock/512 10 CLK_DIV1024 Peripheral clock/1024 Other - SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Description Peripheral clock Reserved 39.7.2 PWM Enable Register Name: PWM_ENA Address: 0x40020004 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 CHID3 2 CHID2 1 CHID1 0 CHID0 * CHIDx: Channel ID 0: No effect. 1: Enable PWM output for channel x. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 985 39.7.3 PWM Disable Register Name: PWM_DIS Address: 0x40020008 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 CHID3 2 CHID2 1 CHID1 0 CHID0 This register can only be written if bits WPSWS1 and WPHWS1 are cleared in the PWM Write Protection Status Register. * CHIDx: Channel ID 0: No effect. 1: Disable PWM output for channel x. 986 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.4 PWM Status Register Name: PWM_SR Address: 0x4002000C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 CHID3 2 CHID2 1 CHID1 0 CHID0 * CHIDx: Channel ID 0: PWM output for channel x is disabled. 1: PWM output for channel x is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 987 39.7.5 PWM Interrupt Enable Register 1 Name: PWM_IER1 Address: 0x40020010 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 FCHID3 18 FCHID2 17 FCHID1 16 FCHID0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 CHID3 2 CHID2 1 CHID1 0 CHID0 * CHIDx: Counter Event on Channel x Interrupt Enable * FCHIDx: Fault Protection Trigger on Channel x Interrupt Enable 988 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.6 PWM Interrupt Disable Register 1 Name: PWM_IDR1 Address: 0x40020014 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 FCHID3 18 FCHID2 17 FCHID1 16 FCHID0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 CHID3 2 CHID2 1 CHID1 0 CHID0 * CHIDx: Counter Event on Channel x Interrupt Disable * FCHIDx: Fault Protection Trigger on Channel x Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 989 39.7.7 PWM Interrupt Mask Register 1 Name: PWM_IMR1 Address: 0x40020018 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 FCHID3 18 FCHID2 17 FCHID1 16 FCHID0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 CHID3 2 CHID2 1 CHID1 0 CHID0 * CHIDx: Counter Event on Channel x Interrupt Mask * FCHIDx: Fault Protection Trigger on Channel x Interrupt Mask 990 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.8 PWM Interrupt Status Register 1 Name: PWM_ISR1 Address: 0x4002001C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 FCHID3 18 FCHID2 17 FCHID1 16 FCHID0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 CHID3 2 CHID2 1 CHID1 0 CHID0 * CHIDx: Counter Event on Channel x 0: No new counter event has occurred since the last read of the PWM_ISR1. 1: At least one counter event has occurred since the last read of the PWM_ISR1. * FCHIDx: Fault Protection Trigger on Channel x 0: No new trigger of the fault protection since the last read of the PWM_ISR1. 1: At least one trigger of the fault protection since the last read of the PWM_ISR1. Note: Reading PWM_ISR1 automatically clears CHIDx and FCHIDx flags. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 991 39.7.9 PWM Sync Channels Mode Register Name: PWM_SCM Address: 0x40020020 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 PTRCS 21 20 PTRM 19 - 18 - 17 16 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 SYNC3 2 SYNC2 1 SYNC1 0 SYNC0 UPDM This register can only be written if bits WPSWS2 and WPHWS2 are cleared in the PWM Write Protection Status Register. * SYNCx: Synchronous Channel x 0: Channel x is not a synchronous channel. 1: Channel x is a synchronous channel. * UPDM: Synchronous Channels Update Mode Value Name 0 MODE0 Manual write of double buffer registers and manual update of synchronous channels(1) 1 MODE1 Manual write of double buffer registers and automatic update of synchronous channels(2) 2 MODE2 Automatic write of duty-cycle update registers by the Peripheral DMA Controller and automatic update of synchronous channels(2) Notes: Description 1. The update occurs at the beginning of the next PWM period, when the UPDULOCK bit in PWM Sync Channels Update Control Register is set. 2. The update occurs when the Update Period is elapsed. * PTRM: Peripheral DMA Controller Transfer Request Mode UPDM PTRM WRDY Flag and Peripheral DMA Controller Transfer Request 0 x The WRDY flag in PWM Interrupt Status Register 2 and the PDC transfer request are never set to `1'. 1 x The WRDY flag in PWM Interrupt Status Register 2 is set to `1' as soon as the update period is elapsed, the Peripheral DMA Controller transfer request is never set to `1'. 0 The WRDY flag in PWM Interrupt Status Register 2 and the PDC transfer request are set to `1' as soon as the update period is elapsed. 1 The WRDY flag in PWM Interrupt Status Register 2 and the PDC transfer request are set to `1' as soon as the selected comparison matches. 2 * PTRCS: Peripheral DMA Controller Transfer Request Comparison Selection Selection of the comparison used to set the flag WRDY and the corresponding Peripheral DMA Controller transfer request. 992 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.10 PWM Sync Channels Update Control Register Name: PWM_SCUC Address: 0x40020028 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 UPDULOCK * UPDULOCK: Synchronous Channels Update Unlock 0: No effect 1: If the UPDM field is set to `0' in PWM Sync Channels Mode Register, writing the UPDULOCK bit to `1' triggers the update of the period value, the duty-cycle and the dead-time values of synchronous channels at the beginning of the next PWM period. If the field UPDM is set to `1' or `2', writing the UPDULOCK bit to `1' triggers only the update of the period value and of the dead-time values of synchronous channels. This bit is automatically reset when the update is done. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 993 39.7.11 PWM Sync Channels Update Period Register Name: PWM_SCUP Address: 0x4002002C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 6 5 4 3 2 1 0 UPRCNT UPR * UPR: Update Period Defines the time between each update of the synchronous channels if automatic trigger of the update is activated (UPDM = 1 or UPDM = 2 in PWM Sync Channels Mode Register). This time is equal to UPR+1 periods of the synchronous channels. * UPRCNT: Update Period Counter Reports the value of the update period counter. 994 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.12 PWM Sync Channels Update Period Update Register Name: PWM_SCUPUPD Address: 0x40020030 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 2 1 0 UPRUPD This register acts as a double buffer for the UPR value. This prevents an unexpected automatic trigger of the update of synchronous channels. * UPRUPD: Update Period Update Defines the wanted time between each update of the synchronous channels if automatic trigger of the update is activated (UPDM = 1 or UPDM = 2 in PWM Sync Channels Mode Register). This time is equal to UPR+1 periods of the synchronous channels. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 995 39.7.13 PWM Interrupt Enable Register 2 Name: PWM_IER2 Address: 0x40020034 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 CMPU7 22 CMPU6 21 CMPU5 20 CMPU4 19 CMPU3 18 CMPU2 17 CMPU1 16 CMPU0 15 CMPM7 14 CMPM6 13 CMPM5 12 CMPM4 11 CMPM3 10 CMPM2 9 CMPM1 8 CMPM0 7 - 6 - 5 - 4 - 3 UNRE 2 TXBUFE 1 ENDTX 0 WRDY * WRDY: Write Ready for Synchronous Channels Update Interrupt Enable * ENDTX: PDC End of TX Buffer Interrupt Enable * TXBUFE: PDC TX Buffer Empty Interrupt Enable * UNRE: Synchronous Channels Update Underrun Error Interrupt Enable * CMPMx: Comparison x Match Interrupt Enable * CMPUx: Comparison x Update Interrupt Enable 996 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.14 PWM Interrupt Disable Register 2 Name: PWM_IDR2 Address: 0x40020038 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 CMPU7 22 CMPU6 21 CMPU5 20 CMPU4 19 CMPU3 18 CMPU2 17 CMPU1 16 CMPU0 15 CMPM7 14 CMPM6 13 CMPM5 12 CMPM4 11 CMPM3 10 CMPM2 9 CMPM1 8 CMPM0 7 - 6 - 5 - 4 - 3 UNRE 2 TXBUFE 1 ENDTX 0 WRDY * WRDY: Write Ready for Synchronous Channels Update Interrupt Disable * ENDTX: PDC End of TX Buffer Interrupt Disable * TXBUFE: PDC TX Buffer Empty Interrupt Disable * UNRE: Synchronous Channels Update Underrun Error Interrupt Disable * CMPMx: Comparison x Match Interrupt Disable * CMPUx: Comparison x Update Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 997 39.7.15 PWM Interrupt Mask Register 2 Name: PWM_IMR2 Address: 0x4002003C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 CMPU7 22 CMPU6 21 CMPU5 20 CMPU4 19 CMPU3 18 CMPU2 17 CMPU1 16 CMPU0 15 CMPM7 14 CMPM6 13 CMPM5 12 CMPM4 11 CMPM3 10 CMPM2 9 CMPM1 8 CMPM0 7 - 6 - 5 - 4 - 3 UNRE 2 TXBUFE 1 ENDTX 0 WRDY * WRDY: Write Ready for Synchronous Channels Update Interrupt Mask * ENDTX: PDC End of TX Buffer Interrupt Mask * TXBUFE: PDC TX Buffer Empty Interrupt Mask * UNRE: Synchronous Channels Update Underrun Error Interrupt Mask * CMPMx: Comparison x Match Interrupt Mask * CMPUx: Comparison x Update Interrupt Mask 998 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.16 PWM Interrupt Status Register 2 Name: PWM_ISR2 Address: 0x40020040 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 CMPU7 22 CMPU6 21 CMPU5 20 CMPU4 19 CMPU3 18 CMPU2 17 CMPU1 16 CMPU0 15 CMPM7 14 CMPM6 13 CMPM5 12 CMPM4 11 CMPM3 10 CMPM2 9 CMPM1 8 CMPM0 7 - 6 - 5 - 4 - 3 UNRE 2 TXBUFE 1 ENDTX 0 WRDY * WRDY: Write Ready for Synchronous Channels Update 0: New duty-cycle and dead-time values for the synchronous channels cannot be written. 1: New duty-cycle and dead-time values for the synchronous channels can be written. * ENDTX: PDC End of TX Buffer 0: The Transmit Counter register has not reached 0 since the last write of the PDC. 1: The Transmit Counter register has reached 0 since the last write of the PDC. * TXBUFE: PDC TX Buffer Empty 0: PWM_TCR or PWM_TCNR has a value other than 0. 1: Both PWM_TCR and PWM_TCNR have a value other than 0. * UNRE: Synchronous Channels Update Underrun Error 0: No Synchronous Channels Update Underrun has occurred since the last read of the PWM_ISR2 register. 1: At least one Synchronous Channels Update Underrun has occurred since the last read of the PWM_ISR2 register. * CMPMx: Comparison x Match 0: The comparison x has not matched since the last read of the PWM_ISR2 register. 1: The comparison x has matched at least one time since the last read of the PWM_ISR2 register. * CMPUx: Comparison x Update 0: The comparison x has not been updated since the last read of the PWM_ISR2 register. 1: The comparison x has been updated at least one time since the last read of the PWM_ISR2 register. Note: Reading PWM_ISR2 automatically clears flags WRDY, UNRE and CMPSx. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 999 39.7.17 PWM Output Override Value Register Name: PWM_OOV Address: 0x40020044 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 OOVL3 18 OOVL2 17 OOVL1 16 OOVL0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 OOVH3 2 OOVH2 1 OOVH1 0 OOVH0 * OOVHx: Output Override Value for PWMH output of the channel x 0: Override value is 0 for PWMH output of channel x. 1: Override value is 1 for PWMH output of channel x. * OOVLx: Output Override Value for PWML output of the channel x 0: Override value is 0 for PWML output of channel x. 1: Override value is 1 for PWML output of channel x. 1000 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.18 PWM Output Selection Register Name: PWM_OS Address: 0x40020048 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 OSL3 18 OSL2 17 OSL1 16 OSL0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 OSH3 2 OSH2 1 OSH1 0 OSH0 * OSHx: Output Selection for PWMH output of the channel x 0: Dead-time generator output DTOHx selected as PWMH output of channel x. 1: Output override value OOVHx selected as PWMH output of channel x. * OSLx: Output Selection for PWML output of the channel x 0: Dead-time generator output DTOLx selected as PWML output of channel x. 1: Output override value OOVLx selected as PWML output of channel x. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1001 39.7.19 PWM Output Selection Set Register Name: PWM_OSS Address: 0x4002004C Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 OSSL3 18 OSSL2 17 OSSL1 16 OSSL0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 OSSH3 2 OSSH2 1 OSSH1 0 OSSH0 * OSSHx: Output Selection Set for PWMH output of the channel x 0: No effect. 1: Output override value OOVHx selected as PWMH output of channel x. * OSSLx: Output Selection Set for PWML output of the channel x 0: No effect. 1: Output override value OOVLx selected as PWML output of channel x. 1002 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.20 PWM Output Selection Clear Register Name: PWM_OSC Address: 0x40020050 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 OSCL3 18 OSCL2 17 OSCL1 16 OSCL0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 OSCH3 2 OSCH2 1 OSCH1 0 OSCH0 * OSCHx: Output Selection Clear for PWMH output of the channel x 0: No effect. 1: Dead-time generator output DTOHx selected as PWMH output of channel x. * OSCLx: Output Selection Clear for PWML output of the channel x 0: No effect. 1: Dead-time generator output DTOLx selected as PWML output of channel x. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1003 39.7.21 PWM Output Selection Set Update Register Name: PWM_OSSUPD Address: 0x40020054 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 OSSUPL3 18 OSSUPL2 17 OSSUPL1 16 OSSUPL0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 OSSUPH3 2 OSSUPH2 1 OSSUPH1 0 OSSUPH0 * OSSUPHx: Output Selection Set for PWMH output of the channel x 0: No effect. 1: Output override value OOVHx selected as PWMH output of channel x at the beginning of the next channel x PWM period. * OSSUPLx: Output Selection Set for PWML output of the channel x 0: No effect. 1: Output override value OOVLx selected as PWML output of channel x at the beginning of the next channel x PWM period. 1004 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.22 PWM Output Selection Clear Update Register Name: PWM_OSCUPD Address: 0x40020058 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 OSCUPL3 18 OSCUPL2 17 OSCUPL1 16 OSCUPL0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 OSCUPH3 2 OSCUPH2 1 OSCUPH1 0 OSCUPH0 * OSCUPHx: Output Selection Clear for PWMH output of the channel x 0: No effect. 1: Dead-time generator output DTOHx selected as PWMH output of channel x at the beginning of the next channel x PWM period. * OSCUPLx: Output Selection Clear for PWML output of the channel x 0: No effect. 1: Dead-time generator output DTOLx selected as PWML output of channel x at the beginning of the next channel x PWM period. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1005 39.7.23 PWM Fault Mode Register Name: PWM_FMR Address: 0x4002005C Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 - 23 22 21 20 FFIL 15 14 13 12 FMOD 7 6 5 4 FPOL This register can only be written if bits WPSWS5 and WPHWS5 are cleared in the PWM Write Protection Status Register. * FPOL: Fault Polarity For each bit y of FPOL, where y is the fault input number: 0: The fault y becomes active when the fault input y is at 0. 1: The fault y becomes active when the fault input y is at 1. * FMOD: Fault Activation Mode For each bit y of FMOD, where y is the fault input number: 0: The fault y is active until the fault condition is removed at the peripheral(1) level. 1: The fault y stays active until the fault condition is removed at the peripheral(1) level AND until it is cleared in the PWM Fault Clear Register. Note: 1. The peripheral generating the fault. * FFIL: Fault Filtering For each bit y of FFIL, where y is the fault input number: 0: The fault input y is not filtered. 1: The fault input y is filtered. CAUTION: To prevent an unexpected activation of the status flag FSy in the PWM Fault Status Register, the bit FMODy can be set to `1' only if the FPOLy bit has been previously configured to its final value. 1006 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.24 PWM Fault Status Register Name: PWM_FSR Address: 0x40020060 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 - 23 22 21 20 - 15 14 13 12 FS 7 6 5 4 FIV * FIV: Fault Input Value For each bit y of FIV, where y is the fault input number: 0: The current sampled value of the fault input y is 0 (after filtering if enabled). 1: The current sampled value of the fault input y is 1 (after filtering if enabled). * FS: Fault Status For each bit y of FS, where y is the fault input number: 0: The fault y is not currently active. 1: The fault y is currently active. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1007 39.7.25 PWM Fault Clear Register Name: PWM_FCR Address: 0x40020064 Access: Write-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 - 23 22 21 20 - 15 14 13 12 - 7 6 5 4 FCLR * FCLR: Fault Clear For each bit y of FCLR, where y is the fault input number: 0: No effect. 1: If bit y of FMOD field is set to `1' and if the fault input y is not at the level defined by the bit y of FPOL field, the fault y is cleared and becomes inactive (FMOD and FPOL fields belong to PWM Fault Mode Register), else writing this bit to `1' has no effect. 1008 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.26 PWM Fault Protection Value Register Name: PWM_FPV Address: 0x40020068 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 FPVL3 18 FPVL2 17 FPVL1 16 FPVL0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 FPVH3 2 FPVH2 1 FPVH1 0 FPVH0 This register can only be written if bits WPSWS5 and WPHWS5 are cleared in the PWM Write Protection Status Register. * FPVHx: Fault Protection Value for PWMH output on channel x 0: PWMH output of channel x is forced to `0' when fault occurs. 1: PWMH output of channel x is forced to `1' when fault occurs. * FPVLx: Fault Protection Value for PWML output on channel x 0: PWML output of channel x is forced to `0' when fault occurs. 1: PWML output of channel x is forced to `1' when fault occurs. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1009 39.7.27 PWM Fault Protection Enable Register Name: PWM_FPE Address: 0x4002006C Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 FPE3 23 22 21 20 FPE2 15 14 13 12 FPE1 7 6 5 4 FPE0 This register can only be written if bits WPSWS5 and WPHWS5 are cleared in the PWM Write Protection Status Register. Only the first 8 bits (number of fault input pins) of fields FPE0, FPE1, FPE2 and FPE3 are significant. * FPEx: Fault Protection Enable for channel x For each bit y of FPEx, where y is the fault input number: 0: Fault y is not used for the fault protection of channel x. 1: Fault y is used for the fault protection of channel x. CAUTION: To prevent an unexpected activation of the fault protection, the bit y of FPEx field can be set to `1' only if the corresponding FPOL field has been previously configured to its final value in PWM Fault Mode Register. 1010 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.28 PWM Event Line x Register Name: PWM_ELMRx Address: 0x4002007C Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 CSEL7 6 CSEL6 5 CSEL5 4 CSEL4 3 CSEL3 2 CSEL2 1 CSEL1 0 CSEL0 * CSELy: Comparison y Selection 0: A pulse is not generated on the event line x when the comparison y matches. 1: A pulse is generated on the event line x when the comparison y match. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1011 39.7.29 PWM Stepper Motor Mode Register Name: PWM_SMMR Address: 0x400200B0 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 DOWN1 16 DOWN0 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 GCEN1 0 GCEN0 * GCENx: Gray Count ENable 0: Disable gray count generation on PWML[2*x], PWMH[2*x], PWML[2*x +1], PWMH[2*x +1] 1: Enable gray count generation on PWML[2*x], PWMH[2*x], PWML[2*x +1], PWMH[2*x +1. * DOWNx: DOWN Count 0: Up counter. 1: Down counter. 1012 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.30 PWM Write Protection Control Register Name: PWM_WPCR Address: 0x400200E4 Access: Write-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 WPRG1 2 WPRG0 1 WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 WPRG5 6 WPRG4 5 WPRG3 4 WPRG2 0 WPCMD See Section 39.6.6 "Register Write Protection" for the list of registers that can be write-protected. * WPCMD: Write Protection Command This command is performed only if the WPKEY corresponds to 0x50574D ("PWM" in ASCII). Value Name 0 DISABLE_SW_PROT Disables the software write protection of the register groups of which the bit WPRGx is at `1'. 1 ENABLE_SW_PROT Enables the software write protection of the register groups of which the bit WPRGx is at `1'. ENABLE_HW_PROT Enables the hardware write protection of the register groups of which the bit WPRGx is at `1'. Only a hardware reset of the PWM controller can disable the hardware write protection. Moreover, to meet security requirements, the PIO lines associated with the PWM can not be configured through the PIO interface. 2 Description * WPRGx: Write Protection Register Group x 0: The WPCMD command has no effect on the register group x. 1: The WPCMD command is applied to the register group x. * WPKEY: Write Protection Key Value Name 0x50574D PASSWD Description Writing any other value in this field aborts the write operation of the WPCMD field. Always reads as 0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1013 39.7.31 PWM Write Protection Status Register Name: PWM_WPSR Address: 0x400200E8 Access: Read-only 31 30 29 28 27 26 25 24 19 18 17 16 WPVSRC 23 22 21 20 WPVSRC 15 - 14 - 13 WPHWS5 12 WPHWS4 11 WPHWS3 10 WPHWS2 9 WPHWS1 8 WPHWS0 7 WPVS 6 - 5 WPSWS5 4 WPSWS4 3 WPSWS3 2 WPSWS2 1 WPSWS1 0 WPSWS0 * WPSWSx: Write Protect SW Status 0: The SW write protection x of the register group x is disabled. 1: The SW write protection x of the register group x is enabled. * WPHWSx: Write Protect HW Status 0: The HW write protection x of the register group x is disabled. 1: The HW write protection x of the register group x is enabled. * WPVS: Write Protect Violation Status 0: No write protection violation has occurred since the last read of the PWM_WPSR. 1: At least one write protection violation has occurred since the last read of the PWM_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protect Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. 1014 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.32 PWM Comparison x Value Register Name: PWM_CMPVx Address: 0x40020130 [0], 0x40020140 [1], 0x40020150 [2], 0x40020160 [3], 0x40020170 [4], 0x40020180 [5], 0x40020190 [6], 0x400201A0 [7] Access: Read/Write 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 CVM 19 18 17 16 11 10 9 8 3 2 1 0 CV 15 14 13 12 CV 7 6 5 4 CV Only the first 16 bits (channel counter size) of field CV are significant. * CV: Comparison x Value Define the comparison x value to be compared with the counter of the channel 0. * CVM: Comparison x Value Mode 0: The comparison x between the counter of the channel 0 and the comparison x value is performed when this counter is incrementing. 1: The comparison x between the counter of the channel 0 and the comparison x value is performed when this counter is decrementing. Note: This bit is not relevant if the counter of the channel 0 is left-aligned (CALG = 0 in PWM Channel Mode Register) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1015 39.7.33 PWM Comparison x Value Update Register Name: PWM_CMPVUPDx Address: 0x40020134 [0], 0x40020144 [1], 0x40020154 [2], 0x40020164 [3], 0x40020174 [4], 0x40020184 [5], 0x40020194 [6], 0x400201A4 [7] Access: Write-only 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 CVMUPD 19 18 17 16 11 10 9 8 3 2 1 0 CVUPD 15 14 13 12 CVUPD 7 6 5 4 CVUPD This register acts as a double buffer for the CV and CVM values. This prevents an unexpected comparison x match. Only the first 16 bits (channel counter size) of field CVUPD are significant. * CVUPD: Comparison x Value Update Define the comparison x value to be compared with the counter of the channel 0. * CVMUPD: Comparison x Value Mode Update 0: The comparison x between the counter of the channel 0 and the comparison x value is performed when this counter is incrementing. 1: The comparison x between the counter of the channel 0 and the comparison x value is performed when this counter is decrementing. Note: This bit is not relevant if the counter of the channel 0 is left-aligned (CALG = 0 in PWM Channel Mode Register) CAUTION: The write of the register PWM_CMPVUPDx must be followed by a write of the register PWM_CMPMUPDx. 1016 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.34 PWM Comparison x Mode Register Name: PWM_CMPMx Address: 0x40020138 [0], 0x40020148 [1], 0x40020158 [2], 0x40020168 [3], 0x40020178 [4], 0x40020188 [5], 0x40020198 [6], 0x400201A8 [7] Access: Read/Write 31 - 30 - 23 22 29 - 28 - 27 - 26 - 21 20 19 18 CUPRCNT 15 14 13 6 24 - 17 16 9 8 1 - 0 CEN CUPR 12 11 10 CPRCNT 7 25 - CPR 5 4 CTR 3 - 2 - * CEN: Comparison x Enable 0: The comparison x is disabled and can not match. 1: The comparison x is enabled and can match. * CTR: Comparison x Trigger The comparison x is performed when the value of the comparison x period counter (CPRCNT) reaches the value defined by CTR. * CPR: Comparison x Period CPR defines the maximum value of the comparison x period counter (CPRCNT). The comparison x value is performed periodically once every CPR+1 periods of the channel 0 counter. * CPRCNT: Comparison x Period Counter Reports the value of the comparison x period counter. Note: The field CPRCNT is read-only * CUPR: Comparison x Update Period Defines the time between each update of the comparison x mode and the comparison x value. This time is equal to CUPR+1 periods of the channel 0 counter. * CUPRCNT: Comparison x Update Period Counter Reports the value of the comparison x update period counter. Note: The field CUPRCNT is read-only SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1017 39.7.35 PWM Comparison x Mode Update Register Name: PWM_CMPMUPDx Address: 0x4002013C [0], 0x4002014C [1], 0x4002015C [2], 0x4002016C [3], 0x4002017C [4], 0x4002018C [5], 0x4002019C [6], 0x400201AC [7] Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 23 - 22 - 21 - 20 - 19 18 15 - 14 - 13 - 12 - 11 7 6 5 4 3 - CTRUPD 25 - 24 - 17 16 9 8 1 - 0 CENUPD CUPRUPD 10 CPRUPD 2 - This register acts as a double buffer for the CEN, CTR, CPR and CUPR values. This prevents an unexpected comparison x match. * CENUPD: Comparison x Enable Update 0: The comparison x is disabled and can not match. 1: The comparison x is enabled and can match. * CTRUPD: Comparison x Trigger Update The comparison x is performed when the value of the comparison x period counter (CPRCNT) reaches the value defined by CTR. * CPRUPD: Comparison x Period Update CPR defines the maximum value of the comparison x period counter (CPRCNT). The comparison x value is performed periodically once every CPR+1 periods of the channel 0 counter. * CUPRUPD: Comparison x Update Period Update Defines the time between each update of the comparison x mode and the comparison x value. This time is equal to CUPR+1 periods of the channel 0 counter. 1018 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.36 PWM Channel Mode Register Name: PWM_CMRx [x=0..3] Address: 0x40020200 [0], 0x40020220 [1], 0x40020240 [2], 0x40020260 [3] Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 DTLI 17 DTHI 16 DTE 15 - 14 - 13 - 12 - 11 - 10 CES 9 CPOL 8 CALG 7 - 6 - 5 - 4 - 3 2 1 0 CPRE This register can only be written if bits WPSWS2 and WPHWS2 are cleared in the PWM Write Protection Status Register. * CPRE: Channel Pre-scaler Value Name Description 0 MCK 1 MCK_DIV_2 Peripheral clock/2 2 MCK_DIV_4 Peripheral clock/4 3 MCK_DIV_8 Peripheral clock/8 4 MCK_DIV_16 Peripheral clock/16 5 MCK_DIV_32 Peripheral clock/32 6 MCK_DIV_64 Peripheral clock/64 7 MCK_DIV_128 Peripheral clock/128 8 MCK_DIV_256 Peripheral clock/256 9 MCK_DIV_512 Peripheral clock/512 10 MCK_DIV_1024 Peripheral clock/1024 11 CLKA Clock A 12 CLKB Clock B Peripheral clock * CALG: Channel Alignment 0: The period is left-aligned. 1: The period is center-aligned. * CPOL: Channel Polarity 0: The OCx output waveform (output from the comparator) starts at a low level. 1: The OCx output waveform (output from the comparator) starts at a high level. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1019 * CES: Counter Event Selection The bit CES defines when the channel counter event occurs when the period is center-aligned (flag CHIDx in PWM Interrupt Status Register 1). CALG = 0 (Left Alignment): 0/1: The channel counter event occurs at the end of the PWM period. CALG = 1 (Center Alignment): 0: The channel counter event occurs at the end of the PWM period. 1: The channel counter event occurs at the end of the PWM period and at half the PWM period. * DTE: Dead-Time Generator Enable 0: The dead-time generator is disabled. 1: The dead-time generator is enabled. * DTHI: Dead-Time PWMHx Output Inverted 0: The dead-time PWMHx output is not inverted. 1: The dead-time PWMHx output is inverted. * DTLI: Dead-Time PWMLx Output Inverted 0: The dead-time PWMLx output is not inverted. 1: The dead-time PWMLx output is inverted. 1020 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.37 PWM Channel Duty Cycle Register Name: PWM_CDTYx [x=0..3] Address: 0x40020204 [0], 0x40020224 [1], 0x40020244 [2], 0x40020264 [3] Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 2 1 0 CDTY 15 14 13 12 CDTY 7 6 5 4 CDTY Only the first 16 bits (channel counter size) are significant. * CDTY: Channel Duty-Cycle Defines the waveform duty-cycle. This value must be defined between 0 and CPRD (PWM_CPRDx). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1021 39.7.38 PWM Channel Duty Cycle Update Register Name: PWM_CDTYUPDx [x=0..3] Address: 0x40020208 [0], 0x40020228 [1], 0x40020248 [2], 0x40020268 [3] Access: Write-only. 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 2 1 0 CDTYUPD 15 14 13 12 CDTYUPD 7 6 5 4 CDTYUPD This register acts as a double buffer for the CDTY value. This prevents an unexpected waveform when modifying the waveform duty-cycle. Only the first 16 bits (channel counter size) are significant. * CDTYUPD: Channel Duty-Cycle Update Defines the waveform duty-cycle. This value must be defined between 0 and CPRD (PWM_CPRDx). 1022 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.39 PWM Channel Period Register Name: PWM_CPRDx [x=0..3] Address: 0x4002020C [0], 0x4002022C [1], 0x4002024C [2], 0x4002026C [3] Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 2 1 0 CPRD 15 14 13 12 CPRD 7 6 5 4 CPRD This register can only be written if bits WPSWS3 and WPHWS3 are cleared in the PWM Write Protection Status Register. Only the first 16 bits (channel counter size) are significant. * CPRD: Channel Period If the waveform is left-aligned, then the output waveform period depends on the channel counter source clock and can be calculated: - By using the PWM peripheral clock divided by an X given prescaler value (with X being 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024). The resulting period formula will be: ( X x CPRD )------------------------------f peripheral clock - By using the PWM peripheral clock divided by one of both DIVA or DIVB divider, the formula becomes, respectively: (----------------------------------------CRPD x DIVA )( CRPD x DIVB ) or -----------------------------------------f peripheral clock f peripheral clock If the waveform is center-aligned, then the output waveform period depends on the channel counter source clock and can be calculated: - By using the PWM peripheral clock divided by an X given prescaler value (with X being 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024). The resulting period formula will be: (---------------------------------------2 x X x CPRD ) f peripheral clock - By using the PWM peripheral clock divided by one of both DIVA or DIVB divider, the formula becomes, respectively: (--------------------------------------------------2 x CPRD x DIVA ) ( 2 x CPRD x DIVB ) or --------------------------------------------------f peripheral clock f peripheral clock SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1023 39.7.40 PWM Channel Period Update Register Name: PWM_CPRDUPDx [x=0..3] Address: 0x40020210 [0], 0x40020230 [1], 0x40020250 [2], 0x40020270 [3] Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 2 1 0 CPRDUPD 15 14 13 12 CPRDUPD 7 6 5 4 CPRDUPD This register can only be written if bits WPSWS3 and WPHWS3 are cleared in the PWM Write Protection Status Register. This register acts as a double buffer for the CPRD value. This prevents an unexpected waveform when modifying the waveform period. Only the first 16 bits (channel counter size) are significant. * CPRDUPD: Channel Period Update If the waveform is left-aligned, then the output waveform period depends on the channel counter source clock and can be calculated: - By using the PWM peripheral clock divided by an X given prescaler value (with X being 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024). The resulting period formula will be: (-------------------------------------------X x CPRDUPD ) f peripheral clock - By using the PWM peripheral clock divided by one of both DIVA or DIVB divider, the formula becomes, respectively: (------------------------------------------------------CRPDUPD x DIVA )( CRPDUPD x DIVB ) or -------------------------------------------------------f peripheral clock f peripheral clock If the waveform is center-aligned, then the output waveform period depends on the channel counter source clock and can be calculated: - By using the PWM peripheral clock divided by an X given prescaler value (with X being 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024). The resulting period formula will be: ( 2 x X x CPRDUPD -) ----------------------------------------------------f peripheral clock - By using the PWM peripheral clock divided by one of both DIVA or DIVB divider, the formula becomes, respectively: ( 2 x CPRDUPD x DIVA -) ( 2 x CPRDUPD x DIVB ) ---------------------------------------------------------------or ----------------------------------------------------------------f peripheral clock f peripheral clock 1024 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.41 PWM Channel Counter Register Name: PWM_CCNTx [x=0..3] Address: 0x40020214 [0], 0x40020234 [1], 0x40020254 [2], 0x40020274 [3] Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 22 21 20 19 18 17 16 11 10 9 8 3 2 1 0 CNT 15 14 13 12 CNT 7 6 5 4 CNT Only the first 16 bits (channel counter size) are significant. * CNT: Channel Counter Register Channel counter value. This register is reset when: * the channel is enabled (writing CHIDx in the PWM_ENA register). * the channel counter reaches CPRD value defined in the PWM_CPRDx register if the waveform is left-aligned. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1025 39.7.42 PWM Channel Dead Time Register Name: PWM_DTx [x=0..3] Address: 0x40020218 [0], 0x40020238 [1], 0x40020258 [2], 0x40020278 [3] Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 DTL 23 22 21 20 DTL 15 14 13 12 DTH 7 6 5 4 DTH This register can only be written if bits WPSWS4 and WPHWS4 are cleared in the PWM Write Protection Status Register. Only the first 12 bits (dead-time counter size) of fields DTH and DTL are significant. * DTH: Dead-Time Value for PWMHx Output Defines the dead-time value for PWMHx output. This value must be defined between 0 and the value (CPRD - CDTY) (PWM_CPRDx and PWM_CDTYx). * DTL: Dead-Time Value for PWMLx Output Defines the dead-time value for PWMLx output. This value must be defined between 0 and CDTY (PWM_CDTYx). 1026 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 39.7.43 PWM Channel Dead Time Update Register Name: PWM_DTUPDx [x=0..3] Address: 0x4002021C [0], 0x4002023C [1], 0x4002025C [2], 0x4002027C [3] Access: Write-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 DTLUPD 23 22 21 20 DTLUPD 15 14 13 12 DTHUPD 7 6 5 4 DTHUPD This register can only be written if bits WPSWS4 and WPHWS4 are cleared in the PWM Write Protection Status Register. This register acts as a double buffer for the DTH and DTL values. This prevents an unexpected waveform when modifying the dead-time values. Only the first 12 bits (dead-time counter size) of fields DTHUPD and DTLUPD are significant. * DTHUPD: Dead-Time Value Update for PWMHx Output Defines the dead-time value for PWMHx output. This value must be defined between 0 and the value (CPRD - CDTY) (PWM_CPRDx and PWM_CDTYx). This value is applied only at the beginning of the next channel x PWM period. * DTLUPD: Dead-Time Value Update for PWMLx Output Defines the dead-time value for PWMLx output. This value must be defined between 0 and CDTY (PWM_CDTYx). This value is applied only at the beginning of the next channel x PWM period. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1027 40. USB Device Port (UDP) 40.1 Description The USB Device Port (UDP) is compliant with the Universal Serial Bus (USB) 2.0 full-speed device specification. Each endpoint can be configured in one of several USB transfer types. It can be associated with one or two banks of a dual-port RAM used to store the current data payload. If two banks are used, one DPR bank is read or written by the processor, while the other is read or written by the USB device peripheral. This feature is mandatory for isochronous endpoints. Thus the device maintains the maximum bandwidth (1 Mbyte/s) by working with endpoints with two banks of DPR. Table 40-1. USB Endpoint Description Endpoint No. Mnemonic Dual-Bank(1) Max. Endpoint Size Endpoint Type 0 EP0 No 64 Control/Bulk/Interrupt 1 EP1 Yes 64 Bulk/Iso/Interrupt 2 EP2 Yes 64 Bulk/Iso/Interrupt 3 EP3 No 64 Control/Bulk/Interrupt 4 EP4 Yes 512 Bulk/Iso/Interrupt 5 EP5 Yes 512 Bulk/Iso/Interrupt 6 EP6 Yes 64 Bulk/Iso/Interrupt 7 EP7 Yes 64 Bulk/Iso/Interrupt Note: 1. The Dual-Bank function provides two banks for an endpoint. This feature is used for ping-pong mode. Suspend and resume are automatically detected by the USB device, which notifies the processor by raising an interrupt. Depending on the product, an external signal can be used to send a wakeup request to the USB host controller. 40.2 1028 Embedded Characteristics USB 2.0 Full-speed Compliant, 12 Mbit/s Embedded USB 2.0 Full-speed Transceiver Integrated Pull-up on DDP Integrated Pull-down on DDM 8 Endpoints Embedded Dual-port RAM for Endpoints Suspend/Resume Logic Ping-pong Mode (2 Memory Banks) for Isochronous and Bulk Endpoints SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Block Diagram Figure 40-1. Block Diagram Atmel Bridge APB to MCU Bus txoen eopn Wrapper MCK USB Device UDPCK Dual Port RAM FIFO User Interface Serial Interface Engine Wrapper 40.3 12 MHz txd rxdm Embedded USB Transceiver DDP DDM rxd SIE rxdp udp_int (interrupt line) Suspend/Resume Logic Master Clock Domain Recovered 12 MHz Domain Access to the UDP is via the APB bus interface. Read and write to the data FIFO are done by reading and writing 8-bit values to APB registers. The UDP peripheral requires two clocks: one peripheral clock used by the Master Clock domain (MCK) and a 48 MHz clock (UDPCK) used by the 12 MHz domain. A USB 2.0 full-speed pad is embedded and controlled by the Serial Interface Engine (SIE). The signal external_resume is optional. It allows the UDP peripheral to wake up once in system mode. The host is then notified that the device asks for a resume. This optional feature must also be negotiated with the host during the enumeration. 40.3.1 Signal Description Table 40-2. Signal Names Signal Name Description Type UDPCK 48 MHz clock Input MCK Master clock Input udp_int Interrupt line connected to the Interrupt Controller Input DDP USB D+ line I/O DDM USB D- line I/O SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1029 40.4 Product Dependencies For further details on the USB Device hardware implementation, see the specific Product Properties document. The USB physical transceiver is integrated into the product. The bidirectional differential signals DDP and DDM are available from the product boundary. One I/O line may be used by the application to check that VBUS is still available from the host. Self-powered devices may use this entry to be notified that the host has been powered off. In this case, the pull-up on DDP must be disabled in order to prevent feeding current to the host. The application should disconnect the transceiver, then remove the pull-up. 40.4.1 I/O Lines The USB pins are shared with PIO lines. By default, the USB function is activated, and pins DDP and DDM are used for USB. To configure DDP or DDM as PIOs, the user needs to configure the system I/O configuration register (CCFG_SYSIO) in the MATRIX. 40.4.2 Power Management The USB device peripheral requires a 48 MHz clock. This clock must be generated by a PLL driven by a clock source with an accuracy of 0.25% (note that the fast RC oscillator cannot be used). Thus, the USB device receives two clocks from the Power Management Controller (PMC): the master clock, MCK, used to drive the peripheral user interface, and the UDPCK, used to interface with the bus USB signals (recovered 12 MHz domain). WARNING: The UDP peripheral clock in the Power Management Controller (PMC) must be enabled before any read/write operations to the UDP registers including the UDP_TXVC register. 40.4.3 Interrupt The USB device interface has an interrupt line connected to the Interrupt Controller. Handling the USB device interrupt requires programming the Interrupt Controller before configuring the UDP. Table 40-3. 40.5 Peripheral IDs Instance ID UDP 34 Typical Connection Figure 40-2. Board Schematic to Interface Device Peripheral PIO 5V Bus Monitoring 27 K 47 K REXT DDM 2 1 3 Type B 4 Connector DDP REXT 1030 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.5.1 USB Device Transceiver The USB device transceiver is embedded in the product. However, discrete components are required for each of the following actions: to monitor VBUS voltage for line termination to disconnect the host for reduced power consumption 40.5.2 VBUS Monitoring VBUS monitoring is required to detect host connection. VBUS monitoring is done using a standard PIO with internal pull-up disabled. When the host is switched off, it should be considered as a disconnect, the pull-up must be disabled in order to prevent powering the host through the pull-up resistor. When the host is disconnected and the transceiver is enabled, then DDP and DDM are floating. This may lead to over consumption. A solution is to enable the integrated pull-down by disabling the transceiver (UDP_TXVC.TXVDIS = 1) and then remove the pull-up (UDP_TXVC.PUON = 0). A termination serial resistor must be connected to DDP and DDM. The resistor value is defined in the electrical specification of the product (REXT). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1031 40.6 Functional Description 40.6.1 USB 2.0 Full-speed Introduction The USB 2.0 full-speed provides communication services between host and attached USB devices. Each device is offered with a collection of communication flows (pipes) associated with each endpoint. Software on the host communicates with a USB device through a set of communication flows. Figure 40-3. Example of USB 2.0 Full-speed Communication Control USB Host V2.0 Software Client 1 Software Client 2 Data Flow: Control Transfer EP0 Data Flow: Isochronous In Transfer USB Device 2.0 EP1 Block 1 Data Flow: Isochronous Out Transfer EP2 Data Flow: Control Transfer EP0 Data Flow: Bulk In Transfer USB Device 2.0 EP4 Block 2 Data Flow: Bulk Out Transfer EP5 USB Device endpoint configuration requires that in the first instance Control Transfer must be EP0. The Control Transfer endpoint EP0 is always used when a USB device is first configured (USB 2.0 specifications). 40.6.1.1 USB 2.0 Full-speed Transfer Types A communication flow is carried over one of four transfer types defined by the USB device. Table 40-4. USB Communication Flow Transfer Direction Bandwidth Supported Endpoint Size Error Detection Retrying Control Bidirectional Not guaranteed 8, 16, 32, 64 Yes Automatic Isochronous Unidirectional Guaranteed 512 Yes No Interrupt Unidirectional Not guaranteed 64 Yes Yes Bulk Unidirectional Not guaranteed 8, 16, 32, 64 Yes Yes 40.6.1.2 USB Bus Transactions Each transfer results in one or more transactions over the USB bus. There are three kinds of transactions flowing across the bus in packets: 1032 Setup Transaction Data IN Transaction Data OUT Transaction SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.6.1.3 USB Transfer Event Definitions As indicated below, transfers are sequential events carried out on the USB bus. Table 40-5. USB Transfer Events Transfer Direction Type Transaction Setup transaction Data IN transactions Status OUT transaction CONTROL (bidirectional) Control (1)(3) Setup transaction Data OUT transactions Status IN transaction Setup transaction Status IN transaction Interrupt IN Isochronous IN(2) IN (device toward host) Data IN transaction Data IN transaction Bulk IN Interrupt OUT OUT (host toward device) Isochronous OUT(2) Data OUT transaction Data OUT transaction Bulk OUT Notes: 1. Control transfer must use endpoints with no ping-pong attributes. 2. Isochronous transfers must use endpoints with ping-pong attributes. 3. Control transfers can be aborted using a stall handshake. A status transaction is a special type of host-to-device transaction used only in a control transfer. The control transfer must be performed using endpoints with no ping-pong attributes. According to the control sequence (read or write), the USB device sends or receives a status transaction. Figure 40-4. Control Read and Write Sequences Setup Stage Control Read Setup TX Setup Stage Control Write No Data Control Notes: 1. Setup TX Status Stage Data Stage Data OUT TX Data OUT TX Data Stage Data IN TX Setup Stage Status Stage Setup TX Status IN TX Status IN TX Status Stage Data IN TX Status OUT TX During the Status IN stage, the host waits for a zero length packet (Data IN transaction with no data) from the device using DATA1 PID. Refer to Chapter 8 of the Universal Serial Bus Specification, Rev. 2.0, for more information on the protocol layer. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1033 2. During the Status OUT stage, the host emits a zero length packet to the device (Data OUT transaction with no data). 40.6.2 Handling Transactions with USB 2.0 Device Peripheral 40.6.2.1 Setup Transaction Setup is a special type of host-to-device transaction used during control transfers. Control transfers must be performed using endpoints with no ping-pong attributes. A setup transaction needs to be handled as soon as possible by the firmware. It is used to transmit requests from the host to the device. These requests are then handled by the USB device and may require more arguments. The arguments are sent to the device by a Data OUT transaction which follows the setup transaction. These requests may also return data. The data is carried out to the host by the next Data IN transaction which follows the setup transaction. A status transaction ends the control transfer. When a setup transfer is received by the USB endpoint: The USB device automatically acknowledges the setup packet RXSETUP is set in the UDP_CSRx An endpoint interrupt is generated while the RXSETUP is not cleared. This interrupt is carried out to the microcontroller if interrupts are enabled for this endpoint. Thus, firmware must detect the RXSETUP polling the UDP_CSRx or catching an interrupt, read the setup packet in the FIFO, then clear the RXSETUP. RXSETUP cannot be cleared before the setup packet has been read in the FIFO. Otherwise, the USB device would accept the next Data OUT transfer and overwrite the setup packet in the FIFO. Figure 40-5. Setup Transaction Followed by a Data OUT Transaction Setup Received USB Bus Packets Setup PID Data Setup RXSETUP Flag Setup Handled by Firmware ACK PID Data OUT PID Data OUT Data OUT PID Data OUT ACK PID Cleared by Firmware Set by USB Device Peripheral RX_Data_BKO (UDP_CSRx) 1034 NAK PID Interrupt Pending Set by USB Device FIFO (DPR) Content Data Out Received XX SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Data Setup XX Data OUT 40.6.2.2 Data IN Transaction Data IN transactions are used in control, isochronous, bulk and interrupt transfers and conduct the transfer of data from the device to the host. Data IN transactions in isochronous transfer must be done using endpoints with pingpong attributes. Using Endpoints Without Ping-pong Attributes To perform a Data IN transaction using a non ping-pong endpoint: 1. The application checks if it is possible to write in the FIFO by polling TXPKTRDY in the endpoint's UDP_CSRx (TXPKTRDY must be cleared). 2. The application writes the first packet of data to be sent in the endpoint's FIFO, writing zero or more byte values in the endpoint's UDP_FDRx. 3. The application notifies the USB peripheral it has finished by setting the TXPKTRDY in the endpoint's UDP_CSRx. 4. The application is notified that the endpoint's FIFO has been released by the USB device when TXCOMP in the endpoint's UDP_CSRx has been set. Then an interrupt for the corresponding endpoint is pending while TXCOMP is set. 5. The microcontroller writes the second packet of data to be sent in the endpoint's FIFO, writing zero or more byte values in the endpoint's UDP_FDRx. 6. The microcontroller notifies the USB peripheral it has finished by setting the TXPKTRDY in the endpoint's UDP_CSRx. 7. The application clears the TXCOMP in the endpoint's UDP_CSRx. After the last packet has been sent, the application must clear TXCOMP once this has been set. TXCOMP is set by the USB device when it has received an ACK PID signal for the Data IN packet. An interrupt is pending while TXCOMP is set. Warning: TX_COMP must be cleared after TX_PKTRDY has been set. Note: Figure 40-6. Refer to Chapter 8 of the Universal Serial Bus Specification, Rev 2.0, for more information on the Data IN protocol layer. Data IN Transfer for Non Ping-pong Endpoint Prevous Data IN TX USB Bus Packets Data IN PID Microcontroller Load Data in FIFO Data IN 1 ACK PID Data IN PID NAK PID Data is Sent on USB Bus Data IN PID Data IN 2 ACK PID TXPKTRDY Flag (UDP_CSRx) Set by the firmware Cleared by HW Cleared by HW Set by the firmware Interrupt Pending Interrupt Pending Payload in FIFO TXCOMP Flag (UDP_CSRx) Cleared by Firmware DPR access by the firmware FIFO (DPR) Content Data IN 1 Load In Progress DPR access by the hardware Cleared by Firmware Data IN 2 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1035 Using Endpoints With Ping-pong Attribute The use of an endpoint with ping-pong attributes is necessary during isochronous transfer. This also allows handling the maximum bandwidth defined in the USB specification during bulk transfer. To be able to guarantee a constant or the maximum bandwidth, the microcontroller must prepare the next data payload to be sent while the current one is being sent by the USB device. Thus two banks of memory are used. While one is available for the microcontroller, the other one is locked by the USB device. Figure 40-7. Bank Swapping Data IN Transfer for Ping-pong Endpoints Microcontroller 1st Data Payload USB Device Write Bank 0 Endpoint 1 USB Bus Read Simultaneous Write and Read 2nd Data Payload Data IN Packet Bank 1 Endpoint 1 Bank 0 Endpoint 1 1st Data Payload Bank 0 Endpoint 1 Bank 1 Endpoint 1 2nd Data Payload 3rd Data Payload Bank 0 Endpoint 1 Data IN Packet Data IN Packet 3rd Data Payload When using a ping-pong endpoint, the following procedures are required to perform Data IN transactions: 1. The microcontroller checks if it is possible to write in the FIFO by polling TXPKTRDY to be cleared in the endpoint's UDP_CSRx. 1036 2. The microcontroller writes the first data payload to be sent in the FIFO (Bank 0), writing zero or more byte values in the endpoint's UDP_FDRx. 3. The microcontroller notifies the USB peripheral it has finished writing in Bank 0 of the FIFO by setting the TXPKTRDY in the endpoint's UDP_CSRx. 4. Without waiting for TXPKTRDY to be cleared, the microcontroller writes the second data payload to be sent in the FIFO (Bank 1), writing zero or more byte values in the endpoint's UDP_FDRx. 5. The microcontroller is notified that the first Bank has been released by the USB device when TXCOMP in the endpoint's UDP_CSRx is set. An interrupt is pending while TXCOMP is being set. 6. Once the microcontroller has received TXCOMP for the first Bank, it notifies the USB device that it has prepared the second Bank to be sent, raising TXPKTRDY in the endpoint's UDP_CSRx. 7. At this step, Bank 0 is available and the microcontroller can prepare a third data payload to be sent. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 40-8. Data IN Transfer for Ping-pong Endpoint Microcontroller Load Data IN Bank 0 USB Bus Packets Data IN PID TXPKTRDY Flag (UDP_MCSRx) Microcontroller Load Data IN Bank 1 USB Device Send Bank 0 Data IN PID ACK PID Data IN Cleared by USB Device, Data Payload Fully Transmitted Set by Firmware, Data Payload Written in FIFO Bank 0 Data IN ACK PID Set by Firmware, Data Payload Written in FIFO Bank 1 Interrupt Pending Set by USB Device TXCOMP Flag (UDP_CSRx) FIFO (DPR) Bank 0 Microcontroller Load Data IN Bank 0 USB Device Send Bank 1 Set by USB Device Interrupt Cleared by Firmware Written by MCU FIFO (DPR) Bank 1 Read by USB Device Written by MCU Written by MCU Read by USB Device Warning: There is software critical path due to the fact that once the second bank is filled, the driver has to wait for TX_COMP to set TX_PKTRDY. If the delay between receiving TX_COMP is set and TX_PKTRDY is set too long, some Data IN packets may be NACKed, reducing the bandwidth. Warning: TX_COMP must be cleared after TX_PKTRDY has been set. 40.6.2.3 Data OUT Transaction Data OUT transactions are used in control, isochronous, bulk and interrupt transfers and conduct the transfer of data from the host to the device. Data OUT transactions in isochronous transfers must be done using endpoints with ping-pong attributes. Data OUT Transaction Without Ping-pong Attributes To perform a Data OUT transaction, using a non ping-pong endpoint: 1. The host generates a Data OUT packet. 2. This packet is received by the USB device endpoint. While the FIFO associated to this endpoint is being used by the microcontroller, a NAK PID is returned to the host. Once the FIFO is available, data are written to the FIFO by the USB device and an ACK is automatically carried out to the host. 3. The microcontroller is notified that the USB device has received a data payload polling RX_DATA_BK0 in the endpoint's UDP_CSRx. An interrupt is pending for this endpoint while RX_DATA_BK0 is set. 4. The number of bytes available in the FIFO is made available by reading RXBYTECNT in the endpoint's UDP_CSRx. 5. The microcontroller carries out data received from the endpoint's memory to its memory. Data received is available by reading the endpoint's UDP_FDRx. 6. The microcontroller notifies the USB device that it has finished the transfer by clearing RX_DATA_BK0 in the endpoint's UDP_CSRx. 7. A new Data OUT packet can be accepted by the USB device. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1037 Figure 40-9. Data OUT Transfer for Non Ping-pong Endpoints Microcontroller Transfers Data Host Sends the Next Data Payload Host Sends Data Payload USB Bus Packets Data OUT PID ACK PID Data OUT 1 RX_DATA_BK0 (UDP_CSRx) Data OUT2 PID Data OUT2 Host Resends the Next Data Payload NAK PID Data OUT2 ACK PID Interrupt Pending Cleared by Firmware, Data Payload Written in FIFO Set by USB Device FIFO (DPR) Content Data OUT PID Data OUT 1 Written by USB Device Data OUT 1 Data OUT 2 Microcontroller Read Written by USB Device An interrupt is pending while the flag RX_DATA_BK0 is set. Memory transfer between the USB device, the FIFO and microcontroller memory is not possible after RX_DATA_BK0 has been cleared. Otherwise, the USB device would accept the next Data OUT transfer and overwrite the current Data OUT packet in the FIFO. Using Endpoints With Ping-pong Attributes During isochronous transfer, using an endpoint with ping-pong attributes is obligatory. To be able to guarantee a constant bandwidth, the microcontroller must read the previous data payload sent by the host, while the current data payload is received by the USB device. Thus two banks of memory are used. While one is available for the microcontroller, the other one is locked by the USB device. Figure 40-10. Bank Swapping in Data OUT Transfers for Ping-pong Endpoints Microcontroller USB Device USB Bus Write Read Simultaneous Write and Read Bank 0 Endpoint 1 1st Data Payload Bank 0 Endpoint 1 Bank 1 Endpoint 1 Data IN Packet nd 2 Data Payload Bank 1 Endpoint 1 Bank 0 Endpoint 1 3rd Data Payload 1st Data Payload 2nd Data Payload Data IN Packet Data IN Packet 3rd Data Payload Bank 0 Endpoint 1 When using a ping-pong endpoint, the following procedures are required to perform Data OUT transactions: 1. The host generates a Data OUT packet. 1038 2. This packet is received by the USB device endpoint. It is written in the endpoint's FIFO Bank 0. 3. The USB device sends an ACK PID packet to the host. The host can immediately send a second Data OUT packet. It is accepted by the device and copied to FIFO Bank 1. 4. The microcontroller is notified that the USB device has received a data payload, polling RX_DATA_BK0 in the endpoint's UDP_CSRx. An interrupt is pending for this endpoint while RX_DATA_BK0 is set. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 5. The number of bytes available in the FIFO is made available by reading RXBYTECNT in the endpoint's UDP_CSRx. 6. The microcontroller transfers out data received from the endpoint's memory to the microcontroller's memory. Data received is made available by reading the endpoint's UDP_FDRx. 7. The microcontroller notifies the USB peripheral device that it has finished the transfer by clearing RX_DATA_BK0 in the endpoint's UDP_CSRx. 8. A third Data OUT packet can be accepted by the USB peripheral device and copied in the FIFO Bank 0. 9. If a second Data OUT packet has been received, the microcontroller is notified by the flag RX_DATA_BK1 set in the endpoint's UDP_CSRx. An interrupt is pending for this endpoint while RX_DATA_BK1 is set. 10. The microcontroller transfers out data received from the endpoint's memory to the microcontroller's memory. Data received is available by reading the endpoint's UDP_FDRx. 11. The microcontroller notifies the USB device it has finished the transfer by clearing RX_DATA_BK1 in the endpoint's UDP_CSRx. 12. A fourth Data OUT packet can be accepted by the USB device and copied in the FIFO Bank 1. Figure 40-11. Data OUT Transfer for Ping-pong Endpoint Microcontroller Reads Data1 in Bank 0, Host Sends Second Data Payload Host Sends First Data Payload USB Bus Packets Data OUT PID RX_DATA_BK0 Flag (UDP_CSRx) Data OUT 1 Set by USB Device, Data Payload Written in FIFO Endpoint Bank 0 Data OUT1 Write by USB Device FIFO (DPR) Bank 1 Data OUT PID Data OUT 2 ACK PID Data OUT PID Data OUT 3 A Cleared by Firmware Interrupt Pending RX_DATA_BK1 Flag (UDP_CSRx) FIFO (DPR) Bank 0 ACK PID Microcontroller Reads Data2 in Bank 1, Host Sends Third Data Payload Cleared by Firmware Set by USB Device, Data Payload Written in FIFO Endpoint Bank 1 Interrupt Pending Data OUT 1 Data OUT 3 Read By Microcontroller Write In Progress Data OUT 2 Data OUT 2 Write by USB Device Read By Microcontroller Note: An interrupt is pending while the RX_DATA_BK0 or RX_DATA_BK1 flag is set. Warning: When RX_DATA_BK0 and RX_DATA_BK1 are both set, there is no way to determine which one to clear first. Thus the software must keep an internal counter to be sure to clear alternatively RX_DATA_BK0 then RX_DATA_BK1. This situation may occur when the software application is busy elsewhere and the two banks are filled by the USB host. Once the application comes back to the USB driver, the two flags are set. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1039 40.6.2.4 Stall Handshake A stall handshake can be used in one of two distinct occasions. (For more information on the stall handshake, refer to Chapter 8 of the Universal Serial Bus Specification, Rev 2.0.) A functional stall is used when the halt feature associated with the endpoint is set. (Refer to Chapter 9 of the Universal Serial Bus Specification, Rev 2.0, for more information on the halt feature.) To abort the current request, a protocol stall is used, but uniquely with control transfer. The following procedure generates a stall packet: 1. The microcontroller sets the FORCESTALL flag in the UDP_CSRx endpoint's register. 2. The host receives the stall packet. 3. The microcontroller is notified that the device has sent the stall by polling the STALLSENT to be set. An endpoint interrupt is pending while STALLSENT is set. The microcontroller must clear STALLSENT to clear the interrupt. When a setup transaction is received after a stall handshake, STALLSENT must be cleared in order to prevent interrupts due to STALLSENT being set. Figure 40-12. Stall Handshake (Data IN Transfer) USB Bus Packets Data IN PID Stall PID Cleared by Firmware FORCESTALL Set by Firmware Interrupt Pending Cleared by Firmware STALLSENT Set by USB Device Figure 40-13. Stall Handshake (Data OUT Transfer) USB Bus Packets Data OUT PID Data OUT Stall PID Set by Firmware FORCESTALL Interrupt Pending STALLSENT Cleared by Firmware Set by USB Device 1040 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.6.2.5 Transmit Data Cancellation Some endpoints have dual-banks whereas some endpoints have only one bank. The procedure to cancel transmission data held in these banks is described below. To see the organization of dual-bank availability refer to Table 40-1 "USB Endpoint Description". Endpoints Without Dual-Banks The cancellation procedure depends on the TXPKTRDY flag value in the UDP_CSR: TXPKTRDY is not set: Reset the endpoint to clear the FIFO (pointers). (See Section 40.7.9 "UDP Reset Endpoint Register".) TXPKTRDY has already been set: Clear TXPKTRDY so that no packet is ready to be sent Reset the endpoint to clear the FIFO (pointers). (See Section 40.7.9 "UDP Reset Endpoint Register".) Endpoints With Dual-Banks The cancellation procedure depends on the TXPKTRDY flag value in the UDP_CSR: TXPKTRDY is not set: Reset the endpoint to clear the FIFO (pointers). (See Section 40.7.9 "UDP Reset Endpoint Register".) TXPKTRDY has already been set: Clear TXPKTRDY and read it back until actually read at 0. Set TXPKTRDY and read it back until actually read at 1. Clear TXPKTRDY so that no packet is ready to be sent. Reset the endpoint to clear the FIFO (pointers). (See Section 40.7.9 "UDP Reset Endpoint Register".) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1041 40.6.3 Controlling Device States A USB device has several possible states. Refer to Chapter 9 of the Universal Serial Bus Specification, Rev 2.0. Figure 40-14. USB Device State Diagram Attached Hub Reset or Deconfigured Hub Configured Bus Inactive Suspended Powered Bus Activity Power Interruption Reset Bus Inactive Suspended Default Bus Activity Reset Address Assigned Bus Inactive Suspended Address Bus Activity Device Deconfigured Device Configured Bus Inactive Configured Suspended Bus Activity Movement from one state to another depends on the USB bus state or on standard requests sent through control transactions via the default endpoint (endpoint 0). After a period of bus inactivity, the USB device enters Suspend Mode. Accepting Suspend/Resume requests from the USB host is mandatory. Constraints in Suspend Mode are very strict for bus-powered applications; devices must not consume more than 2.5 mA on the USB bus. While in Suspend Mode, the host may wake up a device by sending a resume signal (bus activity) or a USB device may send a wakeup request to the host, e.g., waking up a PC by moving a USB mouse. The wakeup feature is not mandatory for all devices and must be negotiated with the host. 40.6.3.1 Not Powered State Self powered devices can detect 5V VBUS using a PIO as described in the typical connection section. When the device is not connected to a host, device power consumption can be reduced by disabling MCK for the UDP, disabling UDPCK and disabling the transceiver. DDP and DDM lines are pulled down by 330 K resistors. 1042 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.6.3.2 Entering Attached State To enable integrated pull-up, the PUON bit in the UDP_TXVC register must be set. Warning: To write to the UDP_TXVC register, MCK clock must be enabled on the UDP. This is done in the Power Management Controller. After pull-up connection, the device enters the powered state. In this state, the UDPCK and MCK must be enabled in the Power Management Controller. The transceiver can remain disabled. 40.6.3.3 From Powered State to Default State After its connection to a USB host, the USB device waits for an end-of-bus reset. The unmaskable flag ENDBUSRES is set in the UDP_ISR and an interrupt is triggered. Once the ENDBUSRES interrupt has been triggered, the device enters Default State. In this state, the UDP software must: Enable the default endpoint, setting the EPEDS flag in the UDP_CSR0 and, optionally, enabling the interrupt for endpoint 0 by writing 1 to the UDP_IER. The enumeration then begins by a control transfer. Configure the interrupt mask register which has been reset by the USB reset detection Enable the transceiver clearing the TXVDIS flag in the UDP_TXVC register. In this state UDPCK and MCK must be enabled. Warning: Each time an ENDBUSRES interrupt is triggered, the Interrupt Mask Register and UDP_CSRs have been reset. 40.6.3.4 From Default State to Address State After a set address standard device request, the USB host peripheral enters the address state. Warning: Before the device enters in address state, it must achieve the Status IN transaction of the control transfer, i.e., the UDP device sets its new address once the TXCOMP flag in the UDP_CSR0 has been received and cleared. To move to address state, the driver software sets the FADDEN flag in the UDP_GLB_STAT register, sets its new address, and sets the FEN bit in the UDP_FADDR register. 40.6.3.5 From Address State to Configured State Once a valid Set Configuration standard request has been received and acknowledged, the device enables endpoints corresponding to the current configuration. This is done by setting the EPEDS and EPTYPE fields in the UDP_CSRx and, optionally, enabling corresponding interrupts in the UDP_IER. 40.6.3.6 Entering in Suspend State When a Suspend (no bus activity on the USB bus) is detected, the RXSUSP signal in the UDP_ISR is set. This triggers an interrupt if the corresponding bit is set in the UDP_IMR. This flag is cleared by writing to the UDP_ICR. Then the device enters Suspend Mode. In this state bus powered devices must drain no more than 2.5 mA from the 5V VBUS. As an example, the microcontroller switches to slow clock, disables the PLL and main oscillator, and goes into Idle Mode. It may also switch off other devices on the board. The USB device peripheral clocks can be switched off. Resume event is asynchronously detected. MCK and UDPCK can be switched off in the Power Management controller and the USB transceiver can be disabled by setting the TXVDIS bit in the UDP_TXVC register. Warning: Read, write operations to the UDP registers are allowed only if MCK is enabled for the UDP peripheral. Switching off MCK for the UDP peripheral must be one of the last operations after writing to the UDP_TXVC register and acknowledging the RXSUSP. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1043 40.6.3.7 Receiving a Host Resume In suspend mode, a resume event on the USB bus line is detected asynchronously, transceiver and clocks are disabled (however the pull-up shall not be removed). Once the resume is detected on the bus, the WAKEUP signal in the UDP_ISR is set. It may generate an interrupt if the corresponding bit in the UDP_IMR is set. This interrupt may be used to wake up the core, enable PLL and main oscillators and configure clocks. Warning: Read, write operations to the UDP registers are allowed only if MCK is enabled for the UDP peripheral. MCK for the UDP must be enabled before clearing the WAKEUP bit in the UDP_ICR and clearing TXVDIS in the UDP_TXVC register. 40.6.3.8 Sending a Device Remote Wakeup Request In Suspend state it is possible to wake up the host sending an external resume. The device must wait at least 5 ms after being entered in suspend before sending an external resume. The device has 10 ms from the moment it starts to drain current and it forces a K state to resume the host. The device must force a K state from 1 to 15 ms to resume the host Before sending a K state to the host, MCK, UDPCK and the transceiver must be enabled. Then to enable the remote wakeup feature, the RMWUPE bit in the UDP_GLB_STAT register must be enabled. To force the K state on the line, a transition of the ESR bit from 0 to 1 has to be done in the UDP_GLB_STAT register by first writing a 0 in the ESR bit and then writing a 1. The K state is automatically generated and released according to the USB 2.0 specification. 1044 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7 USB Device Port (UDP) User Interface WARNING: The UDP peripheral clock in the Power Management Controller (PMC) must be enabled before any read/write operations to the UDP registers, including the UDP_TXVC register. Table 40-6. Register Mapping Offset Register Name Access Reset 0x000 Frame Number Register UDP_FRM_NUM Read-only 0x0000_0000 0x004 Global State Register UDP_GLB_STAT Read/Write 0x0000_0010 0x008 Function Address Register UDP_FADDR Read/Write 0x0000_0100 0x00C Reserved - - - 0x010 Interrupt Enable Register UDP_IER Write-only 0x014 Interrupt Disable Register UDP_IDR Write-only 0x018 Interrupt Mask Register UDP_IMR Read-only 0x0000_1200 0x01C Interrupt Status Register UDP_ISR Read-only -(1) 0x020 Interrupt Clear Register UDP_ICR Write-only 0x024 Reserved - 0x028 Reset Endpoint Register UDP_RST_EP 0x02C Reserved - 0x030 Endpoint Control and Status Register 0 UDP_CSR0 ... ... ... 0x030 + 0x4 * 7 Endpoint Control and Status Register 7 0x050 - - Read/Write 0x0000_0000 - - Read/Write 0x0000_0000 ... ... UDP_CSR7 Read/Write 0x0000_0000 Endpoint FIFO Data Register 0 UDP_FDR0 Read/Write -(1) ... ... ... ... ... 0x050 + 0x4 * 7 Endpoint FIFO Data Register 7 UDP_FDR7 Read/Write -(1) 0x070 Reserved - - - Read/Write 0x0000_0100 - - 0x074 Transceiver Control Register UDP_TXVC 0x078-0xFC Reserved - Notes: (2) 1. Reset values are not defined for UDP_ISR or UDP_FDRx. UDP_FDRs reflect Dual Port RAM memory locations which are not affected by any reset signals. 2. See Warning above the "Register Mapping" on this page. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1045 40.7.1 UDP Frame Number Register Name: UDP_FRM_NUM Address: 0x40034000 Access: Read-only 31 --- 30 --- 29 --- 28 --- 27 --- 26 --- 25 --- 24 --- 23 - 22 - 21 - 20 - 19 - 18 - 17 FRM_OK 16 FRM_ERR 15 - 14 - 13 - 12 - 11 - 10 9 FRM_NUM 8 7 6 5 4 3 2 1 0 FRM_NUM * FRM_NUM[10:0]: Frame Number as Defined in the Packet Field Formats This 11-bit value is incremented by the host on a per frame basis. This value is updated at each start of frame. Value updated at the SOF_EOP (Start of Frame End of Packet). * FRM_ERR: Frame Error This bit is set at SOF_EOP when the SOF packet is received containing an error. This bit is reset upon receipt of SOF_PID. * FRM_OK: Frame OK This bit is set at SOF_EOP when the SOF packet is received without any error. This bit is reset upon receipt of SOF_PID (Packet Identification). In the Interrupt Status Register, the SOF interrupt is updated upon receiving SOF_PID. This bit is set without waiting for EOP. Note: In the 8-bit Register Interface, FRM_OK is bit 4 of FRM_NUM_H and FRM_ERR is bit 3 of FRM_NUM_L. 1046 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.2 UDP Global State Register Name: UDP_GLB_STAT Address: 0x40034004 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 8 - - 7 - 6 - 5 - 4 RMWUPE 3 RSMINPR 2 ESR 1 CONFG 0 FADDEN This register is used to get and set the device state as specified in Chapter 9 of the USB Serial Bus Specification, Rev.2.0. * FADDEN: Function Address Enable Read: 0: Device is not in address state 1: Device is in address state Write: 0: No effect, only a reset can bring back a device to the default state. 1: Sets device in address state. This occurs after a successful Set Address request. Beforehand, the UDP_FADDR register must have been initialized with Set Address parameters. Set Address must complete the Status Stage before setting FADDEN. Refer to chapter 9 of the Universal Serial Bus Specification, Rev. 2.0 for more details. * CONFG: Configured Read: 0: Device is not in configured state 1: Device is in configured state Write: 0: Sets device in a non configured state 1: Sets device in configured state The device is set in configured state when it is in address state and receives a successful Set Configuration request. Refer to Chapter 9 of the Universal Serial Bus Specification, Rev. 2.0 for more details. * ESR: Enable Send Resume 0: Mandatory value prior to starting any Remote Wakeup procedure 1: Starts the Remote Wakeup procedure if this bit value was 0 and if RMWUPE is enabled * RMWUPE: Remote Wakeup Enable 0: The Remote Wakeup feature of the device is disabled. 1: The Remote Wakeup feature of the device is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1047 40.7.3 UDP Function Address Register Name: UDP_FADDR Address: 0x40034008 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 8 - FEN 7 - 6 5 4 3 FADD 2 1 0 * FADD[6:0]: Function Address Value The Function Address Value must be programmed by firmware once the device receives a set address request from the host, and has achieved the status stage of the no-data control sequence. Refer to the Universal Serial Bus Specification, Rev. 2.0 for more information. After power up or reset, the function address value is set to 0. * FEN: Function Enable Read: 0: Function endpoint disabled 1: Function endpoint enabled Write: 0: Disables function endpoint 1: Default value The Function Enable bit (FEN) allows the microcontroller to enable or disable the function endpoints. The microcontroller sets this bit after receipt of a reset from the host. Once this bit is set, the USB device is able to accept and transfer data packets from and to the host. 1048 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.4 UDP Interrupt Enable Register Name: UDP_IER Address: 0x40034010 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 WAKEUP 12 - 11 SOFINT 10 EXTRSM 9 8 RXRSM RXSUSP 7 EP7INT 6 EP6INT 5 EP5INT 4 EP4INT 3 EP3INT 2 EP2INT 1 EP1INT 0 EP0INT * EP0INT: Enable Endpoint 0 Interrupt * EP1INT: Enable Endpoint 1 Interrupt * EP2INT: Enable Endpoint 2Interrupt * EP3INT: Enable Endpoint 3 Interrupt * EP4INT: Enable Endpoint 4 Interrupt * EP5INT: Enable Endpoint 5 Interrupt * EP6INT: Enable Endpoint 6 Interrupt * EP7INT: Enable Endpoint 7 Interrupt 0: No effect 1: Enables corresponding Endpoint Interrupt * RXSUSP: Enable UDP Suspend Interrupt 0: No effect 1: Enables UDP Suspend Interrupt * RXRSM: Enable UDP Resume Interrupt 0: No effect 1: Enables UDP Resume Interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1049 * SOFINT: Enable Start Of Frame Interrupt 0: No effect 1: Enables Start Of Frame Interrupt * WAKEUP: Enable UDP Bus Wakeup Interrupt 0: No effect 1: Enables USB bus Interrupt 1050 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.5 UDP Interrupt Disable Register Name: UDP_IDR Address: 0x40034014 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 WAKEUP 12 - 11 SOFINT 10 EXTRSM 9 8 RXRSM RXSUSP 7 EP7INT 6 EP6INT 5 EP5INT 4 EP4INT 3 EP3INT 2 EP2INT 1 EP1INT 0 EP0INT * EP0INT: Disable Endpoint 0 Interrupt * EP1INT: Disable Endpoint 1 Interrupt * EP2INT: Disable Endpoint 2 Interrupt * EP3INT: Disable Endpoint 3 Interrupt * EP4INT: Disable Endpoint 4 Interrupt * EP5INT: Disable Endpoint 5 Interrupt * EP6INT: Disable Endpoint 6 Interrupt * EP7INT: Disable Endpoint 7 Interrupt 0: No effect 1: Disables corresponding Endpoint Interrupt * RXSUSP: Disable UDP Suspend Interrupt 0: No effect 1: Disables UDP Suspend Interrupt * RXRSM: Disable UDP Resume Interrupt 0: No effect 1: Disables UDP Resume Interrupt * SOFINT: Disable Start Of Frame Interrupt 0: No effect 1: Disables Start Of Frame Interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1051 * WAKEUP: Disable USB Bus Interrupt 0: No effect 1: Disables USB Bus Wakeup Interrupt 1052 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.6 UDP Interrupt Mask Register Name: UDP_IMR Address: 0x40034018 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 WAKEUP 12 BIT12 11 SOFINT 10 EXTRSM 9 8 RXRSM RXSUSP 7 EP7INT 6 EP6INT 5 EP5INT 4 EP4INT 3 EP3INT 2 EP2INT 1 EP1INT 0 EP0INT * EP0INT: Mask Endpoint 0 Interrupt * EP1INT: Mask Endpoint 1 Interrupt * EP2INT: Mask Endpoint 2 Interrupt * EP3INT: Mask Endpoint 3 Interrupt * EP4INT: Mask Endpoint 4 Interrupt * EP5INT: Mask Endpoint 5 Interrupt * EP6INT: Mask Endpoint 6 Interrupt * EP7INT: Mask Endpoint 7 Interrupt 0: Corresponding Endpoint Interrupt is disabled 1: Corresponding Endpoint Interrupt is enabled * RXSUSP: Mask UDP Suspend Interrupt 0: UDP Suspend Interrupt is disabled 1: UDP Suspend Interrupt is enabled * RXRSM: Mask UDP Resume Interrupt. 0: UDP Resume Interrupt is disabled 1: UDP Resume Interrupt is enabled * SOFINT: Mask Start Of Frame Interrupt 0: Start of Frame Interrupt is disabled 1: Start of Frame Interrupt is enabled * BIT12: UDP_IMR Bit 12 Bit 12 of UDP_IMR cannot be masked and is always read at 1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1053 * WAKEUP: USB Bus Wakeup Interrupt 0: USB Bus Wakeup Interrupt is disabled 1: USB Bus Wakeup Interrupt is enabled Note: When the USB block is in suspend mode, the application may power down the USB logic. In this case, any USB HOST resume request that is made must be taken into account and, thus, the reset value of the RXRSM bit of the register UDP_IMR is enabled. 1054 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.7 UDP Interrupt Status Register Name: UDP_ISR Address: 0x4003401C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 WAKEUP 12 ENDBUSRES 11 SOFINT 10 EXTRSM 9 8 RXRSM RXSUSP 7 EP7INT 6 EP6INT 5 EP5INT 4 EP4INT 3 EP3INT 2 EP2INT 1 EP1INT 0 EP0INT * EP0INT: Endpoint 0 Interrupt Status * EP1INT: Endpoint 1 Interrupt Status * EP2INT: Endpoint 2 Interrupt Status * EP3INT: Endpoint 3 Interrupt Status * EP4INT: Endpoint 4 Interrupt Status * EP5INT: Endpoint 5 Interrupt Status * EP6INT: Endpoint 6 Interrupt Status * EP7INT: Endpoint 7Interrupt Status 0: No Endpoint0 Interrupt pending 1: Endpoint0 Interrupt has been raised Several signals can generate this interrupt. The reason can be found by reading UDP_CSR0: RXSETUP set to 1 RX_DATA_BK0 set to 1 RX_DATA_BK1 set to 1 TXCOMP set to 1 STALLSENT set to 1 EP0INT is a sticky bit. Interrupt remains valid until EP0INT is cleared by writing in the corresponding UDP_CSR0 bit. * RXSUSP: UDP Suspend Interrupt Status 0: No UDP Suspend Interrupt pending 1: UDP Suspend Interrupt has been raised The USB device sets this bit when it detects no activity for 3 ms. The USB device enters Suspend mode. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1055 * RXRSM: UDP Resume Interrupt Status 0: No UDP Resume Interrupt pending 1: UDP Resume Interrupt has been raised The USB device sets this bit when a UDP resume signal is detected at its port. After reset, the state of this bit is undefined, the application must clear this bit by setting the RXRSM flag in the UDP_ICR. * SOFINT: Start of Frame Interrupt Status 0: No Start of Frame Interrupt pending 1: Start of Frame Interrupt has been raised This interrupt is raised each time a SOF token has been detected. It can be used as a synchronization signal by using isochronous endpoints. * ENDBUSRES: End of BUS Reset Interrupt Status 0: No End of Bus Reset Interrupt pending 1: End of Bus Reset Interrupt has been raised This interrupt is raised at the end of a UDP reset sequence. The USB device must prepare to receive requests on the endpoint 0. The host starts the enumeration, then performs the configuration. * WAKEUP: UDP Resume Interrupt Status 0: No Wakeup Interrupt pending 1: A Wakeup Interrupt (USB Host Sent a RESUME or RESET) occurred since the last clear. After reset the state of this bit is undefined; the application must clear this bit by setting the WAKEUP flag in the UDP_ICR. 1056 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.8 UDP Interrupt Clear Register Name: UDP_ICR Address: 0x40034020 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 WAKEUP 12 ENDBUSRES 11 SOFINT 10 EXTRSM 9 RXRSM 8 RXSUSP 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 - * RXSUSP: Clear UDP Suspend Interrupt 0: No effect 1: Clears UDP Suspend Interrupt * RXRSM: Clear UDP Resume Interrupt 0: No effect 1: Clears UDP Resume Interrupt * SOFINT: Clear Start Of Frame Interrupt 0: No effect 1: Clears Start Of Frame Interrupt * ENDBUSRES: Clear End of Bus Reset Interrupt 0: No effect 1: Clears End of Bus Reset Interrupt * WAKEUP: Clear Wakeup Interrupt 0: No effect 1: Clears Wakeup Interrupt SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1057 40.7.9 UDP Reset Endpoint Register Name: UDP_RST_EP Address: 0x40034028 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 8 - - 7 EP7 6 EP6 5 EP5 4 EP4 3 EP3 2 EP2 1 EP1 0 EP0 * EP0: Reset Endpoint 0 * EP1: Reset Endpoint 1 * EP2: Reset Endpoint 2 * EP3: Reset Endpoint 3 * EP4: Reset Endpoint 4 * EP5: Reset Endpoint 5 * EP6: Reset Endpoint 6 * EP7: Reset Endpoint 7 This flag is used to reset the FIFO associated with the endpoint and the bit RXBYTECOUNT in the UDP_CSRx. It also resets the data toggle to DATA0. It is useful after removing a HALT condition on a BULK endpoint. Refer to Chapter 5.8.5 in the USB Serial Bus Specification, Rev.2.0. Warning: This flag must be cleared at the end of the reset. It does not clear UDP_CSRx flags. 0: No reset 1: Forces the corresponding endpoint FIF0 pointers to 0, therefore RXBYTECNT field is read at 0 in UDP_CSRx Resetting the endpoint is a two-step operation: 1. Set the corresponding EPx field. 2. Clear the corresponding EPx field. 1058 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.10 UDP Endpoint Control and Status Register (CONTROL_BULK) Name: UDP_CSRx [x = 0..7] (CONTROL_BULK) Address: 0x40034030 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 25 RXBYTECNT 24 23 22 21 20 19 18 17 16 RXBYTECNT 15 EPEDS 14 - 13 - 12 - 11 DTGLE 10 9 EPTYPE 8 7 6 5 4 3 2 0 TXPKTRDY STALLSENT RXSETUP 1 RX_DATA_ BK0 DIR RX_DATA_BK1 FORCESTALL TXCOMP WARNING: Due to synchronization between MCK and UDPCK, the software application must wait for the end of the write operation before executing another write by polling the bits which must be set/cleared. As an example, to perform a control operation on the endpoint without modifying the status flags while accessing the control bits and fields of this register, the status flag bits must first be defined with the "No effect" value `1'. Once the overall UDP_CSR value is defined, the register can be written and then the synchronization wait procedure must be executed. * TXCOMP: Generates an IN Packet with Data Previously Written in the DPR This flag generates an interrupt while it is set to one. Write (cleared by the firmware): 0: Clear the flag, clear the interrupt 1: No effect Read (Set by the USB peripheral): 0: Data IN transaction has not been acknowledged by the Host 1: Data IN transaction is achieved, acknowledged by the Host After having issued a Data IN transaction setting TXPKTRDY, the device firmware waits for TXCOMP to be sure that the host has acknowledged the transaction. * RX_DATA_BK0: Receive Data Bank 0 This flag generates an interrupt while it is set to one. Write (cleared by the firmware): 0: Notify USB peripheral device that data have been read in the FIFO's Bank 0. 1: To leave the read value unchanged. Read (Set by the USB peripheral): 0: No data packet has been received in the FIFO's Bank 0. 1: A data packet has been received, it has been stored in the FIFO's Bank 0. When the device firmware has polled this bit or has been interrupted by this signal, it must transfer data from the FIFO to the microcontroller memory. The number of bytes received is available in RXBYTCENT field. Bank 0 FIFO values are read SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1059 through the UDP_FDRx. Once a transfer is done, the device firmware must release Bank 0 to the USB peripheral device by clearing RX_DATA_BK0. After setting or clearing this bit, a wait time of 3 UDPCK clock cycles and 3 peripheral clock cycles is required before accessing DPR. * RXSETUP: Received Setup This flag generates an interrupt while it is set to one. Read: 0: No setup packet available. 1: A setup data packet has been sent by the host and is available in the FIFO. Write: 0: Device firmware notifies the USB peripheral device that it has read the setup data in the FIFO. 1: No effect. This flag is used to notify the USB device firmware that a valid Setup data packet has been sent by the host and successfully received by the USB device. The USB device firmware may transfer Setup data from the FIFO by reading the UDP_FDRx to the microcontroller memory. Once a transfer has been done, RXSETUP must be cleared by the device firmware. Ensuing Data OUT transaction is not accepted while RXSETUP is set. * STALLSENT: Stall Sent This flag generates an interrupt while it is set to one. This ends a STALL handshake. Read: 0: Host has not acknowledged a stall 1: Host has acknowledged the stall Write: 0: Resets the STALLSENT flag, clears the interrupt 1: No effect This is mandatory for the device firmware to clear this flag. Otherwise the interrupt remains. Refer to chapters 8.4.5 and 9.4.5 of the Universal Serial Bus Specification, Rev. 2.0 for more information on the STALL handshake. * TXPKTRDY: Transmit Packet Ready This flag is cleared by the USB device. This flag is set by the USB device firmware. Read: 0: There is no data to send. 1: The data is waiting to be sent upon reception of token IN. Write: 0: Can be used in the procedure to cancel transmission data. (See Section 40.6.2.5 "Transmit Data Cancellation" on page 1041) 1: A new data payload has been written in the FIFO by the firmware and is ready to be sent. 1060 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 This flag is used to generate a Data IN transaction (device to host). Device firmware checks that it can write a data payload in the FIFO, checking that TXPKTRDY is cleared. Transfer to the FIFO is done by writing in the UDP_FDRx. Once the data payload has been transferred to the FIFO, the firmware notifies the USB device setting TXPKTRDY to one. USB bus transactions can start. TXCOMP is set once the data payload has been received by the host. After setting or clearing this bit, a wait time of 3 UDPCK clock cycles and 3 peripheral clock cycles is required before accessing DPR. * FORCESTALL: Force Stall (used by Control, Bulk and Isochronous Endpoints) Read: 0: Normal state 1: Stall state Write: 0: Return to normal state 1: Send STALL to the host Refer to chapters 8.4.5 and 9.4.5 of the Universal Serial Bus Specification, Rev. 2.0 for more information on the STALL handshake. Control endpoints: During the data stage and status stage, this bit indicates that the microcontroller cannot complete the request. Bulk and interrupt endpoints: This bit notifies the host that the endpoint is halted. The host acknowledges the STALL, device firmware is notified by the STALLSENT flag. * RX_DATA_BK1: Receive Data Bank 1 (only used by endpoints with ping-pong attributes) This flag generates an interrupt while it is set to one. Write (cleared by the firmware): 0: Notifies USB device that data have been read in the FIFO's Bank 1. 1: To leave the read value unchanged. Read (Set by the USB peripheral): 0: No data packet has been received in the FIFO's Bank 1. 1: A data packet has been received, it has been stored in FIFO's Bank 1. When the device firmware has polled this bit or has been interrupted by this signal, it must transfer data from the FIFO to microcontroller memory. The number of bytes received is available in RXBYTECNT field. Bank 1 FIFO values are read through UDP_FDRx. Once a transfer is done, the device firmware must release Bank 1 to the USB device by clearing RX_DATA_BK1. After setting or clearing this bit, a wait time of 3 UDPCK clock cycles and 3 peripheral clock cycles is required before accessing DPR. * DIR: Transfer Direction (only available for control endpoints) (Read/Write) 0: Allows Data OUT transactions in the control data stage. 1: Enables Data IN transactions in the control data stage. Refer to Chapter 8.5.3 of the Universal Serial Bus Specification, Rev. 2.0 for more information on the control data stage. This bit must be set before UDP_CSRx/RXSETUP is cleared at the end of the setup stage. According to the request sent in the setup data packet, the data stage is either a device to host (DIR = 1) or host to device (DIR = 0) data transfer. It is not necessary to check this bit to reverse direction for the status stage. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1061 * EPTYPE[2:0]: Endpoint Type (Read/Write) Value Name Description 0 CTRL Control 1 ISO_OUT Isochronous OUT 5 ISO_IN Isochronous IN 2 BULK_OUT Bulk OUT 6 BULK_IN Bulk IN 3 INT_OUT Interrupt OUT 7 INT_IN Interrupt IN * DTGLE: Data Toggle (Read-only) 0: Identifies DATA0 packet 1: Identifies DATA1 packet Refer to Chapter 8 of the Universal Serial Bus Specification, Rev. 2.0 for more information on DATA0, DATA1 packet definitions. * EPEDS: Endpoint Enable Disable Read: 0: Endpoint disabled 1: Endpoint enabled Write: 0: Disables endpoint 1: Enables endpoint Control endpoints are always enabled. Reading or writing this field has no effect on control endpoints. Note: After reset, all endpoints are configured as control endpoints (zero). * RXBYTECNT[10:0]: Number of Bytes Available in the FIFO (Read-only) When the host sends a data packet to the device, the USB device stores the data in the FIFO and notifies the microcontroller. The microcontroller can load the data from the FIFO by reading RXBYTECENT bytes in the UDP_FDRx. 1062 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.11 UDP Endpoint Control and Status Register (ISOCHRONOUS) Name: UDP_CSRx [x = 0..7] (ISOCHRONOUS) Address: 0x40034030 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 25 RXBYTECNT 24 23 22 21 20 19 18 17 16 RXBYTECNT 15 EPEDS 14 - 13 - 12 - 11 DTGLE 10 9 EPTYPE 8 7 6 5 4 3 2 0 TXPKTRDY ISOERROR RXSETUP 1 RX_DATA_ BK0 DIR RX_DATA_BK1 FORCESTALL TXCOMP * TXCOMP: Generates an IN Packet with Data Previously Written in the DPR This flag generates an interrupt while it is set to one. Write (cleared by the firmware): 0: Clear the flag, clear the interrupt. 1: No effect. Read (Set by the USB peripheral): 0: Data IN transaction has not been acknowledged by the Host. 1: Data IN transaction is achieved, acknowledged by the Host. After having issued a Data IN transaction setting TXPKTRDY, the device firmware waits for TXCOMP to be sure that the host has acknowledged the transaction. * RX_DATA_BK0: Receive Data Bank 0 This flag generates an interrupt while it is set to one. Write (cleared by the firmware): 0: Notify USB peripheral device that data have been read in the FIFO's Bank 0. 1: To leave the read value unchanged. Read (Set by the USB peripheral): 0: No data packet has been received in the FIFO's Bank 0. 1: A data packet has been received, it has been stored in the FIFO's Bank 0. When the device firmware has polled this bit or has been interrupted by this signal, it must transfer data from the FIFO to the microcontroller memory. The number of bytes received is available in RXBYTCENT field. Bank 0 FIFO values are read through the UDP_FDRx. Once a transfer is done, the device firmware must release Bank 0 to the USB peripheral device by clearing RX_DATA_BK0. After setting or clearing this bit, a wait time of 3 UDPCK clock cycles and 3 peripheral clock cycles is required before accessing DPR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1063 * RXSETUP: Received Setup This flag generates an interrupt while it is set to one. Read: 0: No setup packet available. 1: A setup data packet has been sent by the host and is available in the FIFO. Write: 0: Device firmware notifies the USB peripheral device that it has read the setup data in the FIFO. 1: No effect. This flag is used to notify the USB device firmware that a valid Setup data packet has been sent by the host and successfully received by the USB device. The USB device firmware may transfer Setup data from the FIFO by reading the UDP_FDRx to the microcontroller memory. Once a transfer has been done, RXSETUP must be cleared by the device firmware. Ensuing Data OUT transaction is not accepted while RXSETUP is set. * ISOERROR: A CRC error has been detected in an isochronous transfer This flag generates an interrupt while it is set to one. Read: 0: No error in the previous isochronous transfer. 1: CRC error has been detected, data available in the FIFO are corrupted. Write: 0: Resets the ISOERROR flag, clears the interrupt. 1: No effect. * TXPKTRDY: Transmit Packet Ready This flag is cleared by the USB device. This flag is set by the USB device firmware. Read: 0: There is no data to send. 1: The data is waiting to be sent upon reception of token IN. Write: 0: Can be used in the procedure to cancel transmission data. (See Section 40.6.2.5 "Transmit Data Cancellation" on page 1041) 1: A new data payload has been written in the FIFO by the firmware and is ready to be sent. This flag is used to generate a Data IN transaction (device to host). Device firmware checks that it can write a data payload in the FIFO, checking that TXPKTRDY is cleared. Transfer to the FIFO is done by writing in the UDP_FDRx. Once the data payload has been transferred to the FIFO, the firmware notifies the USB device setting TXPKTRDY to one. USB bus transactions can start. TXCOMP is set once the data payload has been received by the host. After setting or clearing this bit, a wait time of 3 UDPCK clock cycles and 3 peripheral clock cycles is required before accessing DPR. 1064 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * FORCESTALL: Force Stall (used by Control, Bulk and Isochronous Endpoints) Read: 0: Normal state. 1: Stall state. Write: 0: Return to normal state. 1: Send STALL to the host. Refer to chapters 8.4.5 and 9.4.5 of the Universal Serial Bus Specification, Rev. 2.0 for more information on the STALL handshake. Control endpoints: During the data stage and status stage, this bit indicates that the microcontroller cannot complete the request. Bulk and interrupt endpoints: This bit notifies the host that the endpoint is halted. The host acknowledges the STALL, device firmware is notified by the STALLSENT flag. * RX_DATA_BK1: Receive Data Bank 1 (only used by endpoints with ping-pong attributes) This flag generates an interrupt while it is set to one. Write (cleared by the firmware): 0: Notifies USB device that data have been read in the FIFO's Bank 1. 1: To leave the read value unchanged. Read (set by the USB peripheral): 0: No data packet has been received in the FIFO's Bank 1. 1: A data packet has been received, it has been stored in FIFO's Bank 1. When the device firmware has polled this bit or has been interrupted by this signal, it must transfer data from the FIFO to microcontroller memory. The number of bytes received is available in RXBYTECNT field. Bank 1 FIFO values are read through UDP_FDRx. Once a transfer is done, the device firmware must release Bank 1 to the USB device by clearing RX_DATA_BK1. After setting or clearing this bit, a wait time of 3 UDPCK clock cycles and 3 peripheral clock cycles is required before accessing DPR. * DIR: Transfer Direction (only available for control endpoints) (Read/Write) 0: Allows Data OUT transactions in the control data stage. 1: Enables Data IN transactions in the control data stage. Refer to Chapter 8.5.3 of the Universal Serial Bus Specification, Rev. 2.0 for more information on the control data stage. This bit must be set before UDP_CSRx/RXSETUP is cleared at the end of the setup stage. According to the request sent in the setup data packet, the data stage is either a device to host (DIR = 1) or host to device (DIR = 0) data transfer. It is not necessary to check this bit to reverse direction for the status stage. * EPTYPE[2:0]: Endpoint Type (Read/Write) Value Name Description 0 CTRL Control 1 ISO_OUT Isochronous OUT 5 ISO_IN Isochronous IN 2 BULK_OUT Bulk OUT SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1065 Value Name Description 6 BULK_IN Bulk IN 3 INT_OUT Interrupt OUT 7 INT_IN Interrupt IN * DTGLE: Data Toggle (Read-only) 0: Identifies DATA0 packet 1: Identifies DATA1 packet Refer to Chapter 8 of the Universal Serial Bus Specification, Rev. 2.0 for more information on DATA0, DATA1 packet definitions. * EPEDS: Endpoint Enable Disable Read: 0: Endpoint disabled 1: Endpoint enabled Write: 0: Disables endpoint 1: Enables endpoint Control endpoints are always enabled. Reading or writing this field has no effect on control endpoints. Note: After reset, all endpoints are configured as control endpoints (zero). * RXBYTECNT[10:0]: Number of Bytes Available in the FIFO (Read-only) When the host sends a data packet to the device, the USB device stores the data in the FIFO and notifies the microcontroller. The microcontroller can load the data from the FIFO by reading RXBYTECENT bytes in the UDP_FDRx. 1066 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 40.7.12 UDP FIFO Data Register Name: UDP_FDRx [x = 0..7] Address: 0x40034050 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 8 - - 7 6 5 4 3 2 1 0 FIFO_DATA * FIFO_DATA[7:0]: FIFO Data Value The microcontroller can push or pop values in the FIFO through this register. RXBYTECNT in the corresponding UDP_CSRx is the number of bytes to be read from the FIFO (sent by the host). The maximum number of bytes to write is fixed by the Max Packet Size in the Standard Endpoint Descriptor. It can not be more than the physical memory size associated to the endpoint. Refer to the Universal Serial Bus Specification, Rev. 2.0 for more information. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1067 40.7.13 UDP Transceiver Control Register Name: UDP_TXVC Address: 0x40034074 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 8 PUON TXVDIS 7 - 6 - 5 - 4 - 3 - 2 - 1 0 - - WARNING: The UDP peripheral clock in the Power Management Controller (PMC) must be enabled before any read/write operations to the UDP registers including the UDP_TXVC register. * TXVDIS: Transceiver Disable When UDP is disabled, power consumption can be reduced significantly by disabling the embedded transceiver. This can be done by setting TXVDIS bit. To enable the transceiver, TXVDIS must be cleared. * PUON: Pull-up On 0: The 1.5K integrated pull-up on DDP is disconnected. 1: The 1.5 K integrated pull-up on DDP is connected. NOTE: If the USB pull-up is not connected on DDP, the user should not write in any UDP register other than the UDP_TXVC register. This is because if DDP and DDM are floating at 0, or pulled down, then SE0 is received by the device with the consequence of a USB Reset. 1068 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 41. Analog Comparator Controller (ACC) 41.1 Description The Analog Comparator Controller (ACC) configures the analog comparator and generates an interrupt depending on user settings. The analog comparator embeds two 8-to-1 multiplexers that generate two internal inputs. These inputs are compared, resulting in a compare output. The hysteresis level, edge detection and polarity are configurable. The ACC also generates a compare event which can be used by the Pulse Width Modulator (PWM). 41.2 41.3 Embedded Characteristics Eight User Analog Inputs Selectable for Comparison Four Voltage References Selectable for Comparison: Temperature Sensor (TS), ADVREF, DAC0 and DAC1 Interrupt Generation Compare Event Fault Generation for PWM Block Diagram Figure 41-1. Analog Comparator Controller Block Diagram Regulator PWM Interrupt Controller PMC Peripheral Clock Digital Controller Analog Comparator AND AND FE 1) External Analog Data Inputs bias inp Mux inn on ACC_IMR. CE + SCO AND - AND on TS Peripheral Clock Synchro and Edge Detect DAC0 DAC1 Mux External 1) Analog Data Inputs on Write Detect and Mask Timer on SELPLUS SELMINUS ACEN ISEL HYST SELFS User Interface Note: INV Write EDGETYP SCO CE ACC_CR ACC_MR/ACR 1. Refer to Table 41-1 for the list of external analog data inputs. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1069 Table 41-1. 41.4 Pin Name Description AD0..AD7 ACC Analog PLUS inputs AD0..AD3 ACC Analog MINUS inputs ADVREF ADCVoltage reference Pin Name List Table 41-2. 41.5 List of External Analog Data Inputs ACC Pin List Pin Name Description Type AD0..AD7 External analog data inputs Input TS On-chip temperature sensor Input ADVREF ADC voltage reference Input DAC0, DAC1 On-chip DAC inputs Input Product Dependencies 41.5.1 I/O Lines The analog input pins (AD0-AD7 and DAC0-1) are multiplexed with digital functions (PIO) on the IO line. By writing the SELMINUS and SELPLUS fields in the ACC Mode Register (ACC_MR), the associated IO lines are set to Analog mode. 41.5.2 Power Management The ACC is clocked through the Power Management Controller (PMC), thus the programmer must first configure the PMC to enable the ACC clock. Note that the voltage regulator must be activated to use the analog comparator. 41.5.3 Interrupt The ACC has an interrupt line connected to the Interrupt Controller (IC). In order to handle interrupts, the Interrupt Controller must be programmed before configuring the ACC. Table 41-3. Peripheral IDs Instance ID ACC 33 41.5.4 Fault Output The ACC has the FAULT output connected to the FAULT input of PWM. Please refer to chapter Section 41.6.4 "Fault Mode" and the implementation of the PWM in the product. 1070 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 41.6 Functional Description 41.6.1 Description The Analog Comparator Controller (ACC) controls the analog comparator settings and performs post-processing of the analog comparator output. When the analog comparator settings are modified, the output of the analog cell may be invalid. The ACC masks the output for the invalid period. A comparison flag is triggered by an event on the output of the analog comparator and an interrupt is generated. The event on the analog comparator output can be selected among falling edge, rising edge or any edge. The ACC registers are listed in Table 41-4. 41.6.2 Analog Settings The user can select the input hysteresis and configure two different options, characterized as follows: High-speed: shortest propagation delay/highest current consumption Low-power: longest propagation delay/lowest current consumption 41.6.3 Output Masking Period As soon as the analog comparator settings change, the output is invalid for a duration depending on ISEL current. A masking period is automatically triggered as soon as a write access is performed on the ACC_MR or ACC Analog Control Register (ACC_ACR) (whatever the register data content). When ISEL = 0, the mask period is 8 x tperipheral clock. When ISEL = 1, the mask period is 128 x tperipheral clock. The masking period is reported by reading a negative value (bit 31 set) on the ACC Interrupt Status Register (ACC_ISR). 41.6.4 Fault Mode In Fault mode, a comparison match event is communicated by the ACC fault output which is directly and internally connected to a PWM fault input. The source of the fault output can be configured as either a combinational value derived from the analog comparator output or as the peripheral clock resynchronized value (Refer to Figure 41-1 "Analog Comparator Controller Block Diagram"). 41.6.5 Register Write Protection To prevent any single software error from corrupting ACC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the ACC Write Protection Mode Register (ACC_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the ACC Write Protection Status Register (ACC_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading the ACC_WPSR. The following registers can be write-protected: ACC Mode Register ACC Analog Control Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1071 41.7 Analog Comparator Controller (ACC) User Interface Table 41-4. Register Mapping Offset Name Access Reset 0x00 Control Register ACC_CR Write-only - 0x04 Mode Register ACC_MR Read/Write 0 - - - 0x08-0x20 Reserved 0x24 Interrupt Enable Register ACC_IER Write-only - 0x28 Interrupt Disable Register ACC_IDR Write-only - 0x2C Interrupt Mask Register ACC_IMR Read-only 0 0x30 Interrupt Status Register ACC_ISR Read-only 0 - - - ACC_ACR Read/Write 0 - - - 0x34-0x90 0x94 0x98-0xE0 Reserved Analog Control Register Reserved 0xE4 Write Protection Mode Register ACC_WPMR Read/Write 0 0xE8 Write Protection Status Register ACC_WPSR Read-only 0 - - - 0xEC-0xFC 1072 Register Reserved SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 41.7.1 ACC Control Register Name: ACC_CR Address: 0x40040000 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 SWRST * SWRST: Software Reset 0: No effect. 1: Resets the module. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1073 41.7.2 ACC Mode Register Name: ACC_MR Address: 0x40040004 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 FE 13 SELFS 12 INV 11 - 10 9 8 ACEN 7 - 6 5 SELPLUS 4 3 - 2 1 SELMINUS 0 EDGETYP This register can only be written if the WPEN bit is cleared in the ACC Write Protection Mode Register. * SELMINUS: Selection for Minus Comparator Input 0..7: Selects the input to apply on analog comparator SELMINUS comparison input. Value Name Description 0 TS Select TS 1 ADVREF Select ADVREF 2 DAC0 Select DAC0 3 DAC1 Select DAC1 4 AD0 Select AD0 5 AD1 Select AD1 6 AD2 Select AD2 7 AD3 Select AD3 * SELPLUS: Selection For Plus Comparator Input 0..7: Selects the input to apply on analog comparator SELPLUS comparison input. Value Name Description 0 AD0 Select AD0 1 AD1 Select AD1 2 AD2 Select AD2 3 AD3 Select AD3 4 AD4 Select AD4 5 AD5 Select AD5 6 AD6 Select AD6 7 AD7 Select AD7 * ACEN: Analog Comparator Enable 0 (DIS): Analog comparator disabled. 1 (EN): Analog comparator enabled. 1074 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * EDGETYP: Edge Type Value Name Description 0 RISING Only rising edge of comparator output 1 FALLING Falling edge of comparator output 2 ANY Any edge of comparator output * INV: Invert Comparator Output 0 (DIS): Analog comparator output is directly processed. 1 (EN): Analog comparator output is inverted prior to being processed. * SELFS: Selection Of Fault Source 0 (CE): The CE flag is used to drive the FAULT output. 1 (OUTPUT): The output of the analog comparator flag is used to drive the FAULT output. * FE: Fault Enable 0 (DIS): The FAULT output is tied to 0. 1 (EN): The FAULT output is driven by the signal defined by SELFS. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1075 41.7.3 ACC Interrupt Enable Register Name: ACC_IER Address: 0x40040024 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 CE * CE: Comparison Edge 0: No effect. 1: Enables the interrupt when the selected edge (defined by EDGETYP) occurs. 1076 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 41.7.4 ACC Interrupt Disable Register Name: ACC_IDR Address: 0x40040028 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 CE * CE: Comparison Edge 0: No effect. 1: Disables the interrupt when the selected edge (defined by EDGETYP) occurs. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1077 41.7.5 ACC Interrupt Mask Register Name: ACC_IMR Address: 0x4004002C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 CE * CE: Comparison Edge 0: The interrupt is disabled. 1: The interrupt is enabled. 1078 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 41.7.6 ACC Interrupt Status Register Name: ACC_ISR Address: 0x40040030 Access: Read-only 31 MASK 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 SCO 0 CE * CE: Comparison Edge (cleared on read) 0: No edge occurred (defined by EDGETYP) on analog comparator output since the last read of ACC_ISR. 1: A selected edge (defined by EDGETYP) on analog comparator output occurred since the last read of ACC_ISR. * SCO: Synchronized Comparator Output Returns an image of the analog comparator output after being pre-processed (refer to Figure 41-1 on page 1069). If INV = 0 SCO = 0 if inn > inp SCO = 1 if inp > inn If INV = 1 SCO = 1 if inn > inp SCO = 0 if inp > inn * MASK: Flag Mask 0: The CE flag and SCO value are valid. 1: The CE flag and SCO value are invalid. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1079 41.7.7 ACC Analog Control Register Name: ACC_ACR Address: 0x40040094 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 1 0 ISEL HYST This register can only be written if the WPEN bit is cleared in ACC Write Protection Mode Register. * ISEL: Current Selection Refer to the section on ACC electrical characteristics in the datasheet. 0 (LOPW): Low-power option. 1 (HISP): High-speed option. * HYST: Hysteresis Selection 0 to 3: Refer to the section on ACC electrical characteristics in the datasheet. 1080 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 41.7.8 ACC Write Protection Mode Register Name: ACC_WPMR Address: 0x400400E4 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x414343 ("ACC" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x414343 ("ACC" in ASCII). See "Register Write Protection" on page 1071 for the list of registers that can be write-protected. * WPKEY: Write Protection Key Value 0x414343 Name PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1081 41.7.9 ACC Write Protection Status Register Name: ACC_WPSR Address: 0x400400E8 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 WPVS * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of ACC_WPSR. 1: A write protection violation (WPEN = 1) has occurred since the last read of ACC_WPSR. 1082 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42. Analog-to-Digital Converter (ADC) 42.1 Description The ADC is based on a 12-bit Analog-to-Digital Converter (ADC) managed by an ADC Controller. Refer to Figure 42-1, "Analog-to-Digital Converter Block Diagram". It also integrates a 16-to-1 analog multiplexer, making possible the analog-to-digital conversions of 16 analog lines.The conversions extend from 0V to the voltage carried on pin ADVREF. Conversion results are reported in a common register for all channels, as well as in a channel-dedicated register. The last channel is internally connected by a temperature sensor. Software trigger, external trigger on rising edge of the ADTRG pin or internal triggers from Timer Counter output(s) are configurable. The comparison circuitry allows automatic detection of values below a threshold, higher than a threshold, in a given range or outside the range, thresholds and ranges being fully configurable. The ADC Controller internal fault output is directly connected to PWM fault input. This input can be asserted by means of comparison circuitry in order to immediately put the PWM output in a safe state (pure combinational path). The ADC also integrates a Sleep mode and a conversion sequencer and connects with a PDC channel. These features reduce both power consumption and processor intervention. This ADC has a selectable single-ended or fully differential input and benefits from a 2-bit programmable gain. A digital error correction circuit based on the multi-bit redundant signed digit (RSD) algorithm is employed in order to reduce INL and DNL errors. Finally, the user can configure ADC timings, such as startup time and tracking time. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1083 42.2 Embedded Characteristics 12-bit Resolution 1 MHz Conversion Rate On-chip Temperature Sensor Management Wide Range of Power Supply Operation Selectable Single-Ended or Differential Input Voltage Programmable Gain For Maximum Full-Scale Input Range 0-VDD Integrated Multiplexer Offering Up to 16 Independent Analog Inputs Individual Enable and Disable of Each Channel Hardware or Software Trigger External Trigger Pin Timer Counter Outputs (Corresponding TIOA Trigger) PWM Event Line Drive of PWM Fault Input PDC Support Possibility of ADC Timings Configuration Two Sleep Modes and Conversion Sequencer Automatic Wakeup on Trigger and Back to Sleep Mode after Conversions of all Enabled Channels Possibility of Customized Channel Sequence Standby Mode for Fast Wakeup Time Response Automatic Window Comparison of Converted Values Register Write Protection 1084 Power Down Capability SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.3 Block Diagram Figure 42-1. Analog-to-Digital Converter Block Diagram Timer Counter Channels ADC 12-bit Controller Trigger Selection ADTRG Control Logic ADC cell ADC Interrupt AHB PDC ADVREF ADCCLK AD0 Analog Inputs Interrupt Controller Peripheral Bridge PIO AD1 IN+ IN- OFFSET ADn S/H PGA Cyclic Pipeline 12-bit Analog-to-Digital Converter User Interface Bus Clock APB CHx GND PMC Peripheral Clock Note: DMA may be referred to as PDC (Peripheral DMA Controller). 42.4 Signal Description Table 42-1. ADC Pin Description Pin Name Description ADVREF reference voltage (1) AD0-AD15 Analog input channels ADTRG External trigger Note: 1. AD15 is not an actual pin but is internally connected to a temperature sensor. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1085 42.5 Product Dependencies 42.5.1 Power Management The ADC Controller is not continuously clocked. The programmer must first enable the ADC Controller peripheral clock in the Power Management Controller (PMC) before using the ADC Controller. However, if the application does not require ADC operations, the ADC Controller clock can be stopped when not needed and restarted when necessary. Configuring the ADC Controller does not require the ADC Controller clock to be enabled. 42.5.2 Interrupt Sources The ADC interrupt line is connected on one of the internal sources of the Interrupt Controller. Using the ADC interrupt requires the interrupt controller to be programmed first. Table 42-2. Peripheral IDs Instance ID ADC 29 42.5.3 Analog Inputs The analog input pins can be multiplexed with PIO lines. In this case, the assignment of the ADC input is automatically done as soon as the corresponding channel is enabled by writing the Channel Enable register (ADC_CHER). By default, after reset, the PIO line is configured as input with its pull-up enabled and the ADC input is connected to the GND. 42.5.4 Temperature Sensor The temperature sensor is internally connected to channel index 15 of the ADC. The temperature sensor provides an output voltage VT that is proportional to the absolute temperature (PTAT). To activate the temperature sensor, the TSON bit in ADC_ACR must be set. After setting the bit, the startup time of the temperature sensor must be achieved prior to initiating any measurements. 42.5.5 I/O Lines The pin ADTRG may be shared with other peripheral functions through the PIO Controller. In this case, the PIO Controller should be set accordingly to assign the pin ADTRG to the ADC function. Table 42-3. 1086 I/O Lines Instance Signal I/O Line Peripheral ADC ADTRG PA8 B ADC AD0 PA17 X1 ADC AD1 PA18 X1 ADC AD2/WKUP9 PA19 X1 ADC AD3/WKUP10 PA20 X1 ADC AD4/RTCOUT0 PB0 X1 ADC AD5/RTCOUT1 PB1 X1 ADC AD6/WKUP12 PB2 X1 ADC AD7 PB3 X1 ADC AD8 PA21 X1 ADC AD9 PA22 X1 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 42-3. I/O Lines (Continued) ADC AD10 PC13 X1 ADC AD11 PC15 X1 ADC AD12 PC12 X1 ADC AD13 PC29 X1 ADC AD14 PC30 X1 42.5.6 Timer Triggers Timer Counters may or may not be used as hardware triggers depending on user requirements. Thus, some or all of the timer counters may be unconnected. 42.5.7 PWM Event Line PWM event lines may or may not be used as hardware triggers depending on user requirements. 42.5.8 Fault Output The ADC Controller has the FAULT output connected to the FAULT input of PWM. Refer to Section 42.6.14 "Fault Output" and implementation of the PWM in the product datasheet. 42.5.9 Conversion Performances For performance and electrical characteristics of the ADC, see the section `Electrical Characteristics'. 42.6 Functional Description 42.6.1 Analog-to-Digital Conversion ADC conversions are sequenced by two operating times: the tracking time and the conversion time. The tracking time represents the time between the channel selection change and the time for the controller to start the ADC. The tracking time is set using the TRACKTIM field of the Mode Register (ADC_MR). The conversion time represents the time for the ADC to convert the analog signal. In order to guarantee a conversion with minimum error, after any start of conversion, the ADC controller waits a number of ADC clock cycles (called hold time) before changing the channel selection again (and so starts a new tracking operation). SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1087 Figure 42-2. Sequence of ADC Conversions When Tracking Time > Conversion Time ADCCLK Trigger event (Hard or Soft) ADC_ON Commands from controller to analog cell ADC_Start ADC_SEL CH0 CH1 CH2 LCDR CH0 CH1 DRDY Start Up Hold Time Time (and tracking of CH0) Conversion of CH0 Hold Time Conversion of CH1 Tracking of CH1 Figure 42-3. Tracking of CH2 Sequence of ADC Conversions When Tracking Time < Conversion Time Read the ADC_LCDR ADCCLK Trigger event (Hard or Soft) ADC_ON Commands from controller to analog cell ADC_Start ADC_SEL CH0 CH1 LCDR CH3 CH2 CH0 CH1 CH2 DRDY Start Up Time & Tracking of CH0 1088 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Hold Time Conversion of CH0 & Tracking of CH1 Hold Time Conversion of CH1 & Tracking of CH2 Hold Time Conversion of CH2 & Tracking of CH3 42.6.2 ADC Clock The ADC uses the ADC clock (ADCCLK) to perform conversions. The ADC clock frequency is selected in the PRESCAL field of ADC_MR. The ADC clock frequency is between fperipheral clock/2, if PRESCAL is 0, and fperipheral clock/512, if PRESCAL is set to 255 (0xFF). PRESCAL must be programmed to provide the ADC clock frequency parameter given in the section `Electrical Characteristics'. 42.6.3 ADC Reference Voltage The conversion is performed on a full range between 0V and the reference voltage pin ADVREF. Analog inputs between these voltages convert to values based on a linear conversion. 42.6.4 Conversion Resolution The ADC analog cell features12-bit resolution. 42.6.5 Conversion Results When a conversion is completed, the resulting digital value is stored in the Channel Data register (ADC_CDRx) of the current channel and in the ADC Last Converted Data register (ADC_LCDR). By setting the TAG option in the Extended Mode Register (ADC_EMR), the ADC_LCDR presents the channel number associated with the last converted data in the CHNB field. The channel EOC bit and the DRDY bit in the Interrupt Status register (ADC_ISR) are set. In the case of a connected PDC channel, DRDY rising triggers a data request. In any case, either EOC and DRDY can trigger an interrupt. Reading one of the ADC_CDRx clears the corresponding EOC bit. Reading ADC_LCDR clears the DRDY bit. Figure 42-4. EOCx and DRDY Flag Behavior Write the ADC_CR with START = 1 Read the ADC_CDRx Write the ADC_CR with START = 1 Read the ADC_LCDR CHx (ADC_CHSR) EOCx (ADC_ISR) DRDY (ADC_ISR) If ADC_CDR is not read before further incoming data is converted, the corresponding OVREx flag is set in the Overrun Status register (ADC_OVER). New data converted when DRDY is high sets the GOVRE bit in ADC_ISR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1089 The OVREx flag is automatically cleared when ADC_OVER is read, and the GOVRE flag is automatically cleared when ADC_ISR is read. Figure 42-5. EOCx, OVREx and GOVREx Flag Behavior Trigger event CH0 (ADC_CHSR) CH1 (ADC_CHSR) ADC_LCDR Undefined Data ADC_CDR0 Undefined Data ADC_CDR1 EOC0 (ADC_ISR) Data C Data B Conversion A GOVRE (ADC_ISR) Data C Data A Undefined Data EOC1 (ADC_ISR) Data B Data A Conversion C Conversion B Read ADC_CDR0 Read ADC_CDR1 Read ADC_ISR DRDY (ADC_ISR) Read ADC_OVER OVRE0 (ADC_OVER) OVRE1 (ADC_OVER) Warning: If the corresponding channel is disabled during a conversion or if it is disabled and then reenabled during a conversion, its associated data and corresponding EOCx and GOVRE flags in ADC_ISR and OVREx flags in ADC_OVER are unpredictable. 1090 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.6.6 Conversion Triggers Conversions of the active analog channels are started with a software or hardware trigger. The software trigger is provided by writing the Control register (ADC_CR) with the START bit at 1. The hardware trigger can be one of the TIOA outputs of the Timer Counter channels, PWM Event line, or the external trigger input of the ADC (ADTRG). The hardware trigger is selected with the TRGSEL field in the ADC_MR. The selected hardware trigger is enabled with the TRGEN bit in the ADC_MR. The minimum time between two consecutive trigger events must be strictly greater than the duration of the longest conversion sequence depending on the configuration of the ADC_MR, ADC_CHSR and ADC_SEQRx. If a hardware trigger is selected, the start of a conversion is triggered after a delay starting at each rising edge of the selected signal. Due to asynchronous handling, the delay may vary in a range of two peripheral clock periods to one ADC clock period. Figure 42-6. Hardware Trigger Delay trigger start delay If one of the TIOA outputs is selected, the corresponding Timer Counter channel must be programmed in Waveform mode. Only one start command is necessary to initiate a conversion sequence on all the channels. The ADC hardware logic automatically performs the conversions on the active channels, then waits for a new request. The Channel Enable (ADC_CHER) and Channel Disable (ADC_CHDR) registers permit the analog channels to be enabled or disabled independently. If the ADC is used with a PDC, only the transfers of converted data from enabled channels are performed and the resulting data buffers should be interpreted accordingly. 42.6.7 Sleep Mode and Conversion Sequencer The ADC Sleep mode maximizes power saving by automatically deactivating the ADC when it is not being used for conversions. Sleep mode is selected by setting the SLEEP bit in ADC_MR. Sleep mode is managed by a conversion sequencer, which automatically processes the conversions of all channels at lowest power consumption. This mode can be used when the minimum period of time between two successive trigger events is greater than the startup period of the ADC. See the section `ADC Characteristics' in the `Electrical Characteristics'. When a start conversion request occurs, the ADC is automatically activated. As the analog cell requires a startup time, the logic waits during this time and starts the conversion on the enabled channels. When all conversions are complete, the ADC is deactivated until the next trigger. Triggers occurring during the sequence are ignored. A Fast wake-up mode is available in ADC_MR as a compromise between power-saving strategy and responsiveness. Setting the FWUP bit enables the Fast wake-up mode. In Fast wake-up mode the ADC cell is not fully deactivated while no conversion is requested, thereby providing less power saving but faster wakeup. The conversion sequencer allows automatic processing with minimum processor intervention and optimized power consumption. Conversion sequences can be performed periodically using a Timer/Counter output or the PWM event line. The periodic acquisition of several samples can be processed automatically without any intervention of the processor via the PDC. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1091 The sequence can be customized by programming the Sequence Channel Registers ADC_SEQR1 and ADC_SEQR2 and setting the USEQ bit of the Mode Register (ADC_MR). The user can choose a specific order of channels and can program up to 16 conversions by sequence. The user is free to create a personal sequence by writing channel numbers in ADC_SEQR1 and ADC_SEQR2. Not only can channel numbers be written in any sequence, channel numbers can be repeated several times. When the bit USEQ in ADC_MR is set, the fields USCHx in ADC_SEQR1 and ADC_SEQR2 are used to define the sequence. Only enabled USCHx fields will be part of the sequence. Each USCHx field has a corresponding enable, CHx, in ADC_CHER (USCHx field with the lowest x index is associated with bit CHx of the lowest index). If all ADC channels (i.e., 16) are used on an application board, there is no restriction of usage of the user sequence. However, if some ADC channels are not enabled for conversion but rather used as pure digital inputs, the respective indexes of these channels cannot be used in the user sequence fields (see ADC_SEQRx). For example, if channel 4 is disabled (ADC_CSR[4] = 0), ADC_SEQRx fields USCH1 up to USCH16 must not contain the value 4. Thus the length of the user sequence may be limited by this behavior. As an example, if only four channels over 16 (CH0 up to CH3) are selected for ADC conversions, the user sequence length cannot exceed four channels. Each trigger event may launch up to four successive conversions of any combination of channels 0 up to 3 but no more (i.e., in this case the sequence CH0, CH0, CH1, CH1, CH1 is impossible). A sequence that repeats the same channel several times requires more enabled channels than channels actually used for conversion. For example, the sequence CH0, CH0, CH1, CH1 requires four enabled channels (four free channels on application boards) whereas only CH0, CH1 are really converted. Note: The reference voltage pins always remain connected in Normal mode as in Sleep mode. 42.6.8 Comparison Window The ADC Controller features automatic comparison functions. It compares converted values to a low threshold, a high threshold or both, depending on the value of the CMPMODE bit in ADC_EMR. The comparison can be done on all channels or only on the channel specified in the CMPSEL field of ADC_EMR. To compare all channels, the CMPALL bit of ADC_EMR must be set. The flag can be read on the COMPE bit of the Interrupt Status register (ADC_ISR) and can trigger an interrupt. The high threshold and the low threshold can be read/write in the Compare Window register (ADC_CWR). 42.6.9 Differential Inputs The ADC can be used either as a single-ended ADC (DIFF bit = 0 in ADC_COR) or as a fully differential ADC (DIFF bit = 1 in ADC_COR) as shown in Figure 42-7. By default, after a reset, the ADC is in Single-ended mode. If ANACH is set in ADC_MR, the ADC can apply a different mode on each channel. Otherwise the parameters of CH0 are applied to all channels. The same inputs are used in Single-ended or Differential mode. In Single-ended mode, inputs are managed by a 16:1-channel analog multiplexer. In Fully Differential mode, inputs are managed by an 8:1-channel analog multiplexer. See Table 42-4. Table 42-4. Input Pins and Channel Numbers Channel Number 1092 Input Pin Single-ended Mode AD0 CH0 AD1 CH1 AD2 CH2 AD3 CH3 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Differential Mode CH0 CH1 Table 42-4. Input Pins and Channel Numbers (Continued) Channel Number Input Pin Single-ended Mode AD4 CH4 AD5 CH5 AD6 CH6 AD7 CH7 AD8 CH8 AD9 CH9 AD10 CH10 AD11 CH11 AD12 CH12 AD13 CH13 AD14 CH14 AD15 CH15 Differential Mode CH2 CH3 CH4 CH5 CH6 CH7 42.6.10 Input Gain and Offset The ADC has a built-in programmable gain amplifier (PGA) and programmable offset. The programmable gain amplifier can be set to gains of 1/2, 1, 2 and 4 and can be used either for single-ended applications or for fully differential applications. If ANACH is set in ADC_MR, the ADC can apply different gain and offset on each channel. Otherwise the parameters of CH0 are applied to all channels. The gain is configurable through the GAIN bit of the Channel Gain register (ADC_CGR) as shown in Table 42-5. Table 42-5. Gain of the Sample and Hold Unit GAIN[1:0] Gain (DIFFx = 0) Gain (DIFFx = 1) 0 1 0.5 1 1 1 2 2 2 3 4 2 To allow the full range, the analog offset of the ADC can be configured by the OFFx bit of the Channel Offset register (ADC_COR). The offset is only available in Single-ended mode. Table 42-6. Offset of the Sample and Hold Unit OFFx Bit Offset (DIFFx = 0) 0 0 1 (G-1)VADVREF/2 Offset (DIFFx = 1) 0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1093 Figure 42-7. Analog Full Scale Ranges in Single-Ended/Differential Applications Versus Gain and Offset Single ended se0fd1=0 Fully differential se0fd1=1 VADVREF VIN+ VIN+ same as gain=1 gain=0.5 )1/2 ) VADVREF (00) VIN- 0 VADVREF (3/4 ) VADVREF VIN+ gain=1 VIN+ )1/2 ) VADVREF VIN- (01) (1/4 ) VADVREF 0 VADVREF offset=1 offset=0 (3/4 ) VADVREF (5 8) VADVREF gain=2 )1/2 ) VADVREF VIN+ VIN+ VIN- (3 8) VADVREF (10) VIN+ (1/4 ) VADVREF 0 VADVREF offset=1 gain=4 same as gain=2 offset=0 (5 8) VADVREF VIN+ )1/2 ) VADVREF (3 8) VADVREF (11) VIN+ (1/4 ) VADVREF (1 8) VADVREF 0 1094 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 VIN+ VIN- 42.6.11 ADC Timings Each ADC has its own minimal startup time that is programmed through the field STARTUP in ADC_MR. A minimal tracking time is necessary for the ADC to guarantee the best converted final value between two channel selections. This time must be programmed in the TRACKTIM field in ADC_MR. When the gain, offset or differential input parameters of the analog cell change between two channels, the analog cell may need a specific settling time before starting the tracking phase. In that case, the controller automatically waits during the settling time defined in ADC_MR. Obviously, if the ANACH option is not set, this time is unused. Warning: No input buffer amplifier to isolate the source is included in the ADC. This must be taken into consideration to program a precise value in the TRACKTIM field. See the section `ADC Characteristics' in the `Electrical Characteristics'. 42.6.12 Automatic Calibration The ADC features an Automatic calibration (AUTOCALIB) mode for gain errors (calibration). The automatic calibration sequence can be started at any time by writing a `1' to the AUTOCAL bit of ADC_CR. The automatic calibration sequence requires a software reset command (SWRST in ADC_CR) prior to writing the AUTOCAL bit. The end of calibration sequence is given by the EOCAL bit in ADC_ISR, and an interrupt is generated if EOCAL interrupt has been enabled (ADC_IER). The calibration sequence performs an automatic calibration on all enabled channels. The channels required for conversion do not need to be all enabled during the calibration process if they are programmed with the same gain. Only channels with different gain settings need to be enabled. The gain settings of all enabled channels must be set before starting the AUTOCALIB sequence. If the gain settings (ADC_CGR and ADC_COR) for a given channel are changed, the AUTOCALIB sequence must then be started again. The calibration data on one or more enabled channels is stored in the internal ADC memory. Then, when a new conversion is started on one or more enabled channels, the converted value (in ADC_LCDR or ADC_CDRx) is a calibrated value. Autocalibration is for settings, not for channels. Therefore, if a specific combination of gain has already been calibrated and a new channel with the same settings is enabled after the initial calibration, there is no need to restart a calibration. If different enabled channels have different gain settings, the corresponding channels must be enabled before starting the calibration. If a software reset is performed (bit SWRST = 1 in ADC_CR) or after power-up (or wake-up from Backup mode), the calibration data in the ADC memory is lost. Changing the ADC reference voltage (ADVREF pin) requires a new calibration sequence. For calibration time and gain error after calibration, refer to the section on the 12-bit ADC in the Electrical Characteristics. 42.6.13 Buffer Structure The PDC read channel is triggered each time a new data is stored in ADC_LCDR. The same structure of data is repeatedly stored in ADC_LCDR each time a trigger event occurs. Depending on user mode of operation (ADC_MR, ADC_CHSR, ADC_SEQR1, ADC_SEQR2) the structure differs. Each data read to PDC buffer, carried on a half-word (16-bit), consists of last converted data right aligned and when TAG is set in ADC_EMR, the four most significant bits are carrying the channel number thus allowing an easier post-processing in the PDC buffer or better checking the PDC buffer integrity. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1095 Figure 42-8. Buffer Structure Assuming ADC_CHSR = 0x000_01600 ADC_EMR(TAG) = 1 trig.event1 DMA Buffer Structure trig.event2 Assuming ADC_CHSR = 0x000_01600 ADC_EMR(TAG) = 0 5 ADC_CDR5 DMA Transfer Base Address (BA) 6 ADC_CDR6 BA + 0x02 8 ADC_CDR8 BA + 0x04 5 ADC_CDR5 6 trig.event1 0 ADC_CDR5 0 ADC_CDR6 0 ADC_CDR8 BA + 0x06 0 ADC_CDR5 ADC_CDR6 BA + 0x08 0 ADC_CDR6 8 ADC_CDR8 BA + 0x0A 0 ADC_CDR8 5 ADC_CDR5 BA + [(N-1) * 6] 0 ADC_CDR5 ADC_CDR6 BA + [(N-1) * 6]+ 0x02 0 ADC_CDR6 ADC_CDR8 BA + [(N-1) * 6]+ 0x04 0 ADC_CDR8 DMA Buffer Structure trig.event2 trig.eventN trig.eventN 6 8 42.6.14 Fault Output The ADC Controller internal fault output is directly connected to PWM fault input. Fault output may be asserted depending on the configuration of ADC_EMR and ADC_CWR and converted values. When the compare occurs, the ADC fault output generates a pulse of one peripheral clock cycle to the PWM fault input. This fault line can be enabled or disabled within PWM. Should it be activated and asserted by the ADC Controller, the PWM outputs are immediately placed in a safe state (pure combinational path). Note that the ADC fault output connected to the PWM is not the COMPE bit. Thus the Fault mode (FMOD) within the PWM configuration must be FMOD = 1. 42.6.15 Register Write Protection To prevent any single software error from corrupting ADC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the "ADC Write Protection Mode Register" (ADC_WPMR). If a write access to the protected registers is detected, the WPVS flag in the "ADC Write Protection Status Register" (ADC_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS flag is automatically reset by reading the ADC_WPSR. The following registers can be write-protected: 1096 ADC Mode Register ADC Channel Sequence 1 Register ADC Channel Sequence 2 Register ADC Channel Enable Register ADC Channel Disable Register ADC Extended Mode Register ADC Compare Window Register ADC Channel Gain Register ADC Channel Offset Register ADC Analog Control Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7 Analog-to-Digital (ADC) User Interface Table 42-7. Register Mapping Offset Register Name Access Reset 0x00 Control Register ADC_CR Write-only - 0x04 Mode Register ADC_MR Read/Write 0x00000000 0x08 Channel Sequence Register 1 ADC_SEQR1 Read/Write 0x00000000 0x0C Channel Sequence Register 2 ADC_SEQR2 Read/Write 0x00000000 0x10 Channel Enable Register ADC_CHER Write-only - 0x14 Channel Disable Register ADC_CHDR Write-only - 0x18 Channel Status Register ADC_CHSR Read-only 0x00000000 0x1C Reserved - - - 0x20 Last Converted Data Register ADC_LCDR Read-only 0x00000000 0x24 Interrupt Enable Register ADC_IER Write-only - 0x28 Interrupt Disable Register ADC_IDR Write-only - 0x2C Interrupt Mask Register ADC_IMR Read-only 0x00000000 0x30 Interrupt Status Register ADC_ISR Read-only 0x00000000 0x3C Overrun Status Register ADC_OVER Read-only 0x00000000 0x40 Extended Mode Register ADC_EMR Read/Write 0x00000000 0x44 Compare Window Register ADC_CWR Read/Write 0x00000000 0x48 Channel Gain Register ADC_CGR Read/Write 0x00000000 0x4C Channel Offset Register ADC_COR Read/Write 0x00000000 0x50 Channel Data Register 0 ADC_CDR0 Read-only 0x00000000 0x54 Channel Data Register 1 ADC_CDR1 Read-only 0x00000000 ... ... ... ... Channel Data Register 15 ADC_CDR15 Read-only 0x00000000 Reserved - - - Analog Control Register ADC_ACR Read/Write 0x00000100 0x98-0xAC Reserved - - - 0xC4-0xE0 Reserved - - - 0xE4 Write Protection Mode Register ADC_WPMR Read/Write 0x00000000 0xE8 Write Protection Status Register ADC_WPSR Read-only 0x00000000 Reserved - - - Reserved for PDC registers - - - ... 0x8C 0x90-0x90 0x94 0xEC-0xFC 0x100-0x124 Note: Any offset not listed in the table must be considered as "reserved". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1097 42.7.1 ADC Control Register Name: ADC_CR Address: 0x40038000 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 AUTOCAL 2 - 1 START 0 SWRST * SWRST: Software Reset 0: No effect. 1: Resets the ADC, simulating a hardware reset. * START: Start Conversion 0: No effect. 1: Begins analog-to-digital conversion. * AUTOCAL: Automatic Calibration of ADC 0: No effect. 1: Launches an automatic calibration of the ADC cell on the next sequence. 1098 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.2 ADC Mode Register Name: ADC_MR Address: 0x40038004 Access: Read/Write 31 USEQ 30 - 29 23 ANACH 22 - 21 15 14 13 28 27 26 TRANSFER 25 24 17 16 TRACKTIM 20 19 18 SETTLING STARTUP 12 11 10 9 8 3 2 TRGSEL 1 0 TRGEN PRESCAL 7 FREERUN 6 FWUP 5 SLEEP 4 - This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * TRGEN: Trigger Enable Value Name Description 0 DIS Hardware triggers are disabled. Starting a conversion is only possible by software. 1 EN Hardware trigger selected by TRGSEL field is enabled. * TRGSEL: Trigger Selection Value Name Description 0 ADC_TRIG0 External trigger 1 ADC_TRIG1 TIO Output of the Timer Counter Channel 0 2 ADC_TRIG2 TIO Output of the Timer Counter Channel 1 3 ADC_TRIG3 TIO Output of the Timer Counter Channel 2 4 ADC_TRIG4 PWM Event Line 0 5 ADC_TRIG5 PWM Event Line 1 6 ADC_TRIG6 Reserved 7 ADC_TRIG7 Reserved * SLEEP: Sleep Mode Value Name 0 NORMAL 1 SLEEP Description Normal Mode: The ADC core and reference voltage circuitry are kept ON between conversions. Sleep Mode: The wake-up time can be modified by programming FWUP bit. * FWUP: Fast Wake Up Value Name Description 0 OFF If SLEEP is 1, then both ADC core and reference voltage circuitry are OFF between conversions 1 ON If SLEEP is 1, then Fast Wake-up Sleep mode: The voltage reference is ON between conversions and ADC core is OFF SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1099 * FREERUN: Free Run Mode Value Name Description 0 OFF Normal Mode 1 ON Free Run Mode: Never wait for any trigger. * PRESCAL: Prescaler Rate Selection PRESCAL = (fperipheral clock / (2 x fADCCLK)) - 1. * STARTUP: Startup Time Value Name Description 0 SUT0 0 periods of ADCCLK 1 SUT8 8 periods of ADCCLK 2 SUT16 16 periods of ADCCLK 3 SUT24 24 periods of ADCCLK 4 SUT64 64 periods of ADCCLK 5 SUT80 80 periods of ADCCLK 6 SUT96 96 periods of ADCCLK 7 SUT112 112 periods of ADCCLK 8 SUT512 512 periods of ADCCLK 9 SUT576 576 periods of ADCCLK 10 SUT640 640 periods of ADCCLK 11 SUT704 704 periods of ADCCLK 12 SUT768 768 periods of ADCCLK 13 SUT832 832 periods of ADCCLK 14 SUT896 896 periods of ADCCLK 15 SUT960 960 periods of ADCCLK * SETTLING: Analog Settling Time Value Name Description 0 AST3 3 periods of ADCCLK 1 AST5 5 periods of ADCCLK 2 AST9 9 periods of ADCCLK 3 AST17 17 periods of ADCCLK * ANACH: Analog Change Value Name Description 0 NONE No analog change on channel switching: DIFF0, GAIN0 and OFF0 are used for all channels. 1 ALLOWED Allows different analog settings for each channel. See ADC_CGR and ADC_COR registers. * TRACKTIM: Tracking Time Tracking Time = (TRACKTIM + 1) x ADCCLK periods 1100 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * TRANSFER: Hold Time The TRANSFER field should be set to 2 to guarantee the optimal hold time. * USEQ: Use Sequence Enable Value Name Description 0 NUM_ORDER Normal Mode: The controller converts channels in a simple numeric order depending only on the channel index. 1 REG_ORDER User Sequence Mode: The sequence respects what is defined in ADC_SEQR1 and ADC_SEQR2 registers and can be used to convert the same channel several times. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1101 42.7.3 ADC Channel Sequence 1 Register Name: ADC_SEQR1 Address: 0x40038008 Access: Read/Write 31 30 29 28 27 26 USCH8 23 22 21 20 19 18 USCH6 15 14 13 6 24 17 16 9 8 1 0 USCH5 12 11 10 USCH4 7 25 USCH7 USCH3 5 4 3 USCH2 2 USCH1 This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * USCHx: User Sequence Number x The sequence number x (USCHx) can be programmed by the channel number CHy where y is the value written in this field. The allowed range is 0 up to 15, thus only the sequencer from CH0 to CH15 can be used. This register activates only if the USEQ field in ADC_MR field is set to `1'. Any USCHx field is processed only if the CHx field in ADC_CHSR reads logical `1', else any value written in USCHx does not add the corresponding channel in the conversion sequence. Configuring the same value in different fields leads to multiple samples of the same channel during the conversion sequence. This can be done consecutively, or not, according to user needs. When configuring consecutive fields with the same value, the associated channel is sampled as many time as the number of consecutive values, this part of the conversion sequence being triggered by a unique event. 1102 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.4 ADC Channel Sequence 2 Register Name: ADC_SEQR2 Address: 0x4003800C Access: Read/Write 31 30 29 28 27 26 - 23 22 21 20 19 18 USCH14 15 14 13 6 24 17 16 9 8 1 0 USCH13 12 11 10 USCH12 7 25 USCH15 USCH11 5 4 3 USCH10 2 USCH9 This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * USCHx: User Sequence Number x The sequence number x (USCHx) can be programmed by the Channel number CHy where y is the value written in this field. The allowed range is 0 up to 15. So it is only possible to use the sequencer from CH0 to CH15. This register activates only if the USEQ field in ADC_MR is set to `1'. Any USCHx field is processed only if the CHx field in ADC_CHSR reads logical `1'. Else any value written in USCHx does not add the corresponding channel in the conversion sequence. Configuring the same value in different fields leads to multiple samples of the same channel during the conversion sequence. This can be done consecutively, or not, according to user needs. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1103 42.7.5 ADC Channel Enable Register Name: ADC_CHER Address: 0x40038010 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 CH15 14 CH14 13 CH13 12 CH12 11 CH11 10 CH10 9 CH9 8 CH8 7 CH7 6 CH6 5 CH5 4 CH4 3 CH3 2 CH2 1 CH1 0 CH0 This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * CHx: Channel x Enable 0: No effect. 1: Enables the corresponding channel. Note: If USEQ = 1 in the ADC_MR, CHx corresponds to the xth channel of the sequence described in ADC_SEQR1 and ADC_SEQR2. 1104 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.6 ADC Channel Disable Register Name: ADC_CHDR Address: 0x40038014 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 CH15 14 CH14 13 CH13 12 CH12 11 CH11 10 CH10 9 CH9 8 CH8 7 CH7 6 CH6 5 CH5 4 CH4 3 CH3 2 CH2 1 CH1 0 CH0 This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * CHx: Channel x Disable 0: No effect. 1: Disables the corresponding channel. Warning: If the corresponding channel is disabled during a conversion or if it is disabled and then reenabled during a conversion, its associated data and corresponding EOCx and GOVRE flags in ADC_ISR and OVREx flags in ADC_OVER are unpredictable. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1105 42.7.7 ADC Channel Status Register Name: ADC_CHSR Address: 0x40038018 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 CH15 14 CH14 13 CH13 12 CH12 11 CH11 10 CH10 9 CH9 8 CH8 7 CH7 6 CH6 5 CH5 4 CH4 3 CH3 2 CH2 1 CH1 0 CH0 * CHx: Channel x Status 0: The corresponding channel is disabled. 1: The corresponding channel is enabled. 1106 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.8 ADC Last Converted Data Register Name: ADC_LCDR Address: 0x40038020 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 1 0 CHNB 7 6 LDATA 5 4 3 2 LDATA * LDATA: Last Data Converted The analog-to-digital conversion data is placed into this register at the end of a conversion and remains until a new conversion is completed. * CHNB: Channel Number Indicates the last converted channel when the TAG bit is set in the ADC_EMR. If the TAG bit is not set, CHNB = 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1107 42.7.9 ADC Interrupt Enable Register Name: ADC_IER Address: 0x40038024 Access: Write-only 31 - 30 - 29 - 28 RXBUFF 27 ENDRX 26 COMPE 25 GOVRE 24 DRDY 23 EOCAL 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 EOC15 14 EOC14 13 EOC13 12 EOC12 11 EOC11 10 EOC10 9 EOC9 8 EOC8 7 EOC7 6 EOC6 5 EOC5 4 EOC4 3 EOC3 2 EOC2 1 EOC1 0 EOC0 The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Enables the corresponding interrupt. * EOCx: End of Conversion Interrupt Enable x * EOCAL: End of Calibration Sequence * DRDY: Data Ready Interrupt Enable * GOVRE: General Overrun Error Interrupt Enable * COMPE: Comparison Event Interrupt Enable * ENDRX: End of Receive Buffer Interrupt Enable * RXBUFF: Receive Buffer Full Interrupt Enable 1108 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.10 ADC Interrupt Disable Register Name: ADC_IDR Address: 0x40038028 Access: Write-only 31 - 30 - 29 - 28 RXBUFF 27 ENDRX 26 COMPE 25 GOVRE 24 DRDY 23 EOCAL 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 EOC15 14 EOC14 13 EOC13 12 EOC12 11 EOC11 10 EOC10 9 EOC9 8 EOC8 7 EOC7 6 EOC6 5 EOC5 4 EOC4 3 EOC3 2 EOC2 1 EOC1 0 EOC0 The following configuration values are valid for all listed bit names of this register: 0: No effect. 1: Disables the corresponding interrupt. * EOCx: End of Conversion Interrupt Disable x * EOCAL: End of Calibration Sequence * DRDY: Data Ready Interrupt Disable * GOVRE: General Overrun Error Interrupt Disable * COMPE: Comparison Event Interrupt Disable * ENDRX: End of Receive Buffer Interrupt Disable * RXBUFF: Receive Buffer Full Interrupt Disable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1109 42.7.11 ADC Interrupt Mask Register Name: ADC_IMR Address: 0x4003802C Access: Read-only 31 - 30 - 29 - 28 RXBUFF 27 ENDRX 26 COMPE 25 GOVRE 24 DRDY 23 EOCAL 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 EOC15 14 EOC14 13 EOC13 12 EOC12 11 EOC11 10 EOC10 9 EOC9 8 EOC8 7 EOC7 6 EOC6 5 EOC5 4 EOC4 3 EOC3 2 EOC2 1 EOC1 0 EOC0 The following configuration values are valid for all listed bit names of this register: 0: The corresponding interrupt is disabled. 1: The corresponding interrupt is enabled. * EOCx: End of Conversion Interrupt Mask x * EOCAL: End of Calibration Sequence * DRDY: Data Ready Interrupt Mask * GOVRE: General Overrun Error Interrupt Mask * COMPE: Comparison Event Interrupt Mask * ENDRX: End of Receive Buffer Interrupt Mask * RXBUFF: Receive Buffer Full Interrupt Mask 1110 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.12 ADC Interrupt Status Register Name: ADC_ISR Address: 0x40038030 Access: Read-only 31 - 30 - 29 - 28 RXBUFF 27 ENDRX 26 COMPE 25 GOVRE 24 DRDY 23 EOCAL 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 EOC15 14 EOC14 13 EOC13 12 EOC12 11 EOC11 10 EOC10 9 EOC9 8 EOC8 7 EOC7 6 EOC6 5 EOC5 4 EOC4 3 EOC3 2 EOC2 1 EOC1 0 EOC0 * EOCx: End of Conversion x (automatically set / cleared) 0: The corresponding analog channel is disabled, or the conversion is not finished. This flag is cleared when reading the corresponding ADC_CDRx registers. 1: The corresponding analog channel is enabled and conversion is complete. * EOCAL: End of Calibration Sequence 0: Calibration sequence is ongoing, or no calibration sequence has been requested. 1: Calibration sequence is complete. * DRDY: Data Ready (automatically set / cleared) 0: No data has been converted since the last read of ADC_LCDR. 1: At least one data has been converted and is available in ADC_LCDR. * GOVRE: General Overrun Error (cleared on read) 0: No general overrun error occurred since the last read of ADC_ISR. 1: At least one general overrun error has occurred since the last read of ADC_ISR. * COMPE: Comparison Event (cleared on read) 0: No comparison event since the last read of ADC_ISR. 1: At least one comparison event (defined in the ADC_EMR and ADC_CWR) has occurred since the last read of ADC_ISR. * ENDRX: End of Receive Transfer (cleared by writing ADC_RCR or ADC_RNCR) 0: The Receive Counter Register has not reached 0 since the last write in ADC_RCR or ADC_RNCR(1). 1: The Receive Counter Register has reached 0 since the last write in ADC_RCR or ADC_RNCR(1). * RXBUFF: Receive Buffer Full (cleared by writing ADC_RCR or ADC_RNCR) 0: ADC_RCR or ADC_RNCR(1) has a value other than 0. 1: Both ADC_RCR and ADC_RNCR(1) have a value of 0. Note: 1. ADC_RCR and ADC_RNCR are PDC registers SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1111 42.7.13 ADC Overrun Status Register Name: ADC_OVER Address: 0x4003803C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 OVRE15 14 OVRE14 13 OVRE13 12 OVRE12 11 OVRE11 10 OVRE10 9 OVRE9 8 OVRE8 7 OVRE7 6 OVRE6 5 OVRE5 4 OVRE4 3 OVRE3 2 OVRE2 1 OVRE1 0 OVRE0 * OVREx: Overrun Error x 0: No overrun error on the corresponding channel since the last read of ADC_OVER. 1: An overrun error has occurred on the corresponding channel since the last read of ADC_OVER. 1112 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.14 ADC Extended Mode Register Name: ADC_EMR Address: 0x40038040 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 TAG 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 CMPALL 8 - 7 6 5 4 3 - 2 - 1 0 CMPSEL CMPMODE This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * CMPMODE: Comparison Mode Value Name Description 0 LOW Generates an event when the converted data is lower than the low threshold of the window. 1 HIGH Generates an event when the converted data is higher than the high threshold of the window. 2 IN 3 OUT Generates an event when the converted data is in the comparison window. Generates an event when the converted data is out of the comparison window. * CMPSEL: Comparison Selected Channel If CMPALL = 0: CMPSEL indicates which channel has to be compared. If CMPALL = 1: No effect. * CMPALL: Compare All Channels 0: Only channel indicated in CMPSEL field is compared. 1: All channels are compared. * TAG: Tag of the ADC_LCDR 0: Sets CHNB field to zero in ADC_LCDR. 1: Appends the channel number to the conversion result in ADC_LCDR. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1113 42.7.15 ADC Compare Window Register Name: ADC_CWR Address: 0x40038044 Access: Read/Write 31 - 30 - 29 - 28 - 23 22 21 20 27 26 25 24 17 16 9 8 1 0 HIGHTHRES 19 18 11 10 HIGHTHRES 15 - 14 - 13 - 12 - 7 6 5 4 LOWTHRES 3 2 LOWTHRES This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * LOWTHRES: Low Threshold Low threshold associated to compare settings of the ADC_EMR. * HIGHTHRES: High Threshold High threshold associated to compare settings of the ADC_EMR. 1114 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.16 ADC Channel Gain Register Name: ADC_CGR Address: 0x40038048 Access: Read/Write 31 30 29 GAIN15 23 22 21 GAIN11 15 27 14 20 13 19 6 12 5 18 11 17 16 GAIN8 10 3 24 GAIN12 9 GAIN5 4 GAIN2 25 GAIN9 GAIN6 GAIN3 26 GAIN13 GAIN10 GAIN7 7 28 GAIN14 8 GAIN4 2 1 GAIN1 0 GAIN0 This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * GAINx: Gain for Channel x Gain applied on input of analog-to-digital converter. Value Name Description 0 SE1_DIFF0_5 1 SE1_DIFF1 Single-ended gain = 1 (ADC_COR.DIFFx = 0), differential gain = 1 (ADC_COR.DIFFx = 1) 2 SE2_DIFF2 Single-ended gain = 2 (ADC_COR.DIFFx = 0), differential gain = 2 (ADC_COR.DIFFx = 1) 3 SE4_DIFF2 Single-ended gain = 4 (ADC_COR.DIFFx = 0), differential gain = 2 (ADC_COR.DIFFx = 1) Single-ended gain = 1 (ADC_COR.DIFFx = 0), differential gain = 0.5 (ADC_COR.DIFFx = 1) The DIFFx bit in this table is described in Section 42.7.17 "ADC Channel Offset Register". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1115 42.7.17 ADC Channel Offset Register Name: ADC_COR Address: 0x4003804C Access: Read/Write 31 DIFF15 30 DIFF14 29 DIFF13 28 DIFF12 27 DIFF11 26 DIFF10 25 DIFF9 24 DIFF8 23 DIFF7 22 DIFF6 21 DIFF5 20 DIFF4 19 DIFF3 18 DIFF2 17 DIFF1 16 DIFF0 15 OFF15 14 OFF14 13 OFF13 12 OFF12 11 OFF11 10 OFF10 9 OFF9 8 OFF8 7 OFF7 6 OFF6 5 OFF5 4 OFF4 3 OFF3 2 OFF2 1 OFF1 0 OFF0 This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * OFFx: Offset for Channel x 0: No offset. 1: Centers the analog signal on VADVREF/2 before the gain scaling. The offset applied is (G-1)VADVREF/2 where G is the gain applied (see Section 42.7.16 "ADC Channel Gain Register"). * DIFFx: Differential Inputs for Channel x 0: Single-ended mode. 1: Fully differential mode. 1116 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 42.7.18 ADC Channel Data Register Name: ADC_CDRx [x=0..15] Address: 0x40038050 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 10 9 8 7 6 5 4 1 0 DATA 3 2 DATA * DATA: Converted Data The analog-to-digital conversion data is placed into this register at the end of a conversion and remains until a new conversion is completed. ADC_CDRx is only loaded if the corresponding analog channel is enabled. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1117 42.7.19 ADC Analog Control Register Name: ADC_ACR Address: 0x40038094 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 7 - 6 - 5 - 4 TSON 3 - 2 - 1 - 8 IBCTL This register can only be written if the WPEN bit is cleared in the ADC Write Protection Mode Register. * TSON: Temperature Sensor On 0: Temperature sensor is off. 1: Temperature sensor is on. * IBCTL: ADC Bias Current Control Adapts performance versus power consumption. See the section `Electrical Characteristics' for further details. 1118 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 0 - 42.7.20 ADC Write Protection Mode Register Name: ADC_WPMR Address: 0x400380E4 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY value corresponds to 0x414443 ("ADC" in ASCII). 1: Enables the write protection if WPKEY value corresponds to 0x414443 ("ADC" in ASCII). See Section 42.6.15 "Register Write Protection" for the list of write-protected registers. * WPKEY: Write Protection Key Value Name 0x414443 PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1119 42.7.21 ADC Write Protection Status Register Name: ADC_WPSR Address: 0x400380E8 Access: Read-only 31 - 30 - 29 - 28 - 23 22 21 20 27 - 26 - 25 - 24 - 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPVS WPVSRC 15 14 13 12 WPVSRC 7 - 6 - 5 - 4 - * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the ADC_WPSR. 1: A write protection violation has occurred since the last read of the ADC_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. 1120 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43. Digital-to-Analog Converter Controller (DACC) 43.1 Description The Digital-to-Analog Converter Controller (DACC) provides up to 2 analog outputs, making it possible for the digital-to-analog conversion to drive up to 2 independent analog lines. The DACC supports 12-bit resolution. Data to be converted are sent in a common register for all channels. External triggers or free-running mode are configurable. 43.2 Embedded Characteristics Up to Two Independent Analog Outputs 12-bit Resolution Individual Enable and Disable of Each Analog Channel Hardware Trigger External Trigger Pins PDC Support Internal FIFO Register Write Protection SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1121 43.3 Block Diagram Figure 43-1. DACC Block Diagram Timer Counter (TC) External triggers DAC Controller (DACC) Trigger Selection DATRG DAC Clock Control Logic Interrupt Controller Analog Cell (DAC) PDC DAC Core 43.4 Sample & Hold 1 DAC0 DAC1 Peripheral Bridge peripheral clock PMC Signal Description Table 43-1. 43.5 Sample & Hold 0 User Interface DACC Pin Description Pin Name Description DAC0-DAC1 Analog output channels DATRG External triggers Product Dependencies 43.5.1 Power Management The user must first enable the DAC Controller Clock in the Power Management Controller (PMC) before using the DACC. The DACC becomes active as soon as a conversion is requested and at least one channel is enabled. The DACC is automatically deactivated when no channels are enabled. 1122 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 For power-saving options, see Section 43.6.6 "DACC Timings". 43.5.2 Interrupt Sources The DACC interrupt line is connected to one of the internal sources of the interrupt controller. Using the DACC interrupt requires the interrupt controller to be programmed first. Table 43-2. Peripheral IDs Instance ID DACC 30 43.5.3 Conversion Performances For performance and electrical characteristics of the DACC, see the product DC Characteristics section of the datasheet. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1123 43.6 Functional Description 43.6.1 Digital-to-Analog Conversion The DACC uses the peripheral clock divided by two to perform conversions. This clock is named DAC clock. Once a conversion starts, the DACC takes 25 clock periods to provide the analog result on the selected analog output. 43.6.2 Conversion Results When a conversion is completed, the resulting analog value is available at the selected DACC channel output and the EOC bit in the DACC Interrupt Status Register (DACC_ISR) is set. Reading the DACC_ISR clears the EOC bit. 43.6.3 Conversion Triggers In free-running mode, conversion starts as soon as at least one channel is enabled and data is written in the DACC Conversion Data Register (DACC_CDR). 25 DAC clock periods later, the converted data is available at the corresponding analog output as stated above. In external trigger mode, the conversion waits for a rising edge on the selected trigger to begin. Warning: Disabling the external trigger mode automatically sets the DACC in free-running mode. 43.6.4 Conversion FIFO A four half-word FIFO is used to handle the data to be converted. If the TXRDY flag in the DACC_ISR is active, the DACC is ready to accept conversion requests by writing data into the DATA field in the DACC_CDR. Data which cannot be converted immediately is stored in the DACC FIFO. When the FIFO is full or when the DACC is not ready to accept conversion requests, the TXRDY flag is inactive. The WORD field of the DACC Mode Register (DACC_MR) allows the user to switch between half-word and word transfers in order to write into the FIFO. In half-word transfer mode, only the 16 LSBs of DACC_CDR data are processed. Bits DATA[15:0] are stored in the FIFO. Bits DATA[11:0] are used as data. Bits DATA[15:12] are used for channel selection if the TAG field is set in DACC_MR. In word transfer mode, each time DACC_CDR is written, two data items are stored in the FIFO. The first data item sampled for conversion is DATA[15:0] and the second is DATA[31:16]. Bits DATA[15:12] and DATA[31:28] are used for channel selection if the TAG field is set in DACC_MR. Warning: Writing in the DACC_CDR while the TXRDY flag is inactive will corrupt FIFO data. 43.6.5 Channel Selection There are two ways to select the channel to perform data conversion. By default, the USER_SEL field of the DACC_MR is used. Data requests are converted to the channel selected with the USER_SEL field. Alternatively, the tag mode can be used by setting the TAG field of the DACC_MR to 1. In this mode, the two bits, DACC_CDR[13:12], which are otherwise unused, are employed to select the channel in the same way as with the USER_SEL field. Finally, if the WORD field is set, the two bits, DACC_CDR[13:12] are used for channel selection of the first data and the two bits, DACC_CDR[29:28] for channel selection of the second data. 43.6.6 DACC Timings The DACC start-up time must be defined by the user in the STARTUP field of the DACC_MR. 1124 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 A maximum speed mode is available by setting the MAXS bit in the DACC_MR. In this mode, the DACC no longer waits to sample the end-of-cycle signal coming from the DACC block to start the next conversion. An internal counter is used instead, thus gaining two peripheral clock periods between each consecutive conversion. Warning: If the maximum speed mode is used, the EOC interrupt of the DACC_IER should not be used as it is two peripheral clock periods late. The accuracy of the analog voltage resulting from the data conversion process cannot be guaranteed due to leakage. To ensure accuracy, the channel must be refreshed on a regular basis. A value is correctly refreshed if the correct sampling period is selected (see DACC electrical characteristics) and the software or PDC is able to sustain writing to DACC_CDR at the rate imposed by the trigger period. Figure 43-2. Conversion Sequence Peripheral clock Select Channel 0 Select Channel 1 Write USER_SEL field Selected Channel None Channel 0 Channel 1 CDR FIFO not full TXRDY Data 0 Data 1 Data 2 Write DACC_CDR DAC Channel 0 Output Data 0 DAC Channel 1 Output Data 1 Data 2 EOC Read DACC_ISR 43.6.7 Register Write Protection To prevent any single software error from corrupting DACC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the DACC Write Protection Mode Register (DACC_WPMR). If a write access to a write-protected register is detected, the WPVS flag in the DACC Write Protection Status Register (DACC_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted. The WPVS bit is automatically cleared after reading the DACC_WPSR. The following registers can be write-protected: DACC Mode Register DACC Channel Enable Register DACC Channel Disable Register DACC Analog Current Register SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1125 43.7 Digital-to-Analog Converter Controller (DACC) User Interface Table 43-3. Register Mapping Offset Register Name Access Reset 0x00 Control Register DACC_CR Write-only - 0x04 Mode Register DACC_MR Read/Write 0x00000000 Reserved - - - 0x10 Channel Enable Register DACC_CHER Write-only - 0x14 Channel Disable Register DACC_CHDR Write-only - 0x18 Channel Status Register DACC_CHSR Read-only 0x00000000 0x1C Reserved - - - 0x20 Conversion Data Register DACC_CDR Write-only - 0x24 Interrupt Enable Register DACC_IER Write-only - 0x28 Interrupt Disable Register DACC_IDR Write-only - 0x2C Interrupt Mask Register DACC_IMR Read-only 0x00000000 0x30 Interrupt Status Register DACC_ISR Read-only 0x00000000 Reserved - - - Analog Current Register DACC_ACR Read/Write 0x00000000 Reserved - - - 0xE4 Write Protection Mode Register DACC_WPMR Read/Write 0x00000000 0xE8 Write Protection Status Register DACC_WPSR Read-only 0x00000000 Reserved - - - 0x08-0x0C 0x34-0x90 0x94 0x98-0xE0 0xEC-0xFC 1126 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43.7.1 DACC Control Register Name: DACC_CR Address: 0x4003C000 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 SWRST * SWRST: Software Reset 0: No effect 1: Resets the DACC, simulating a hardware reset SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1127 43.7.2 DACC Mode Register Name: DACC_MR Address: 0x4003C004 Access: Read/Write 31 - 30 - 29 28 23 - 22 - 21 MAXS 20 TAG 15 - 14 - 13 - 7 - 6 - 5 - 27 26 25 24 19 - 18 - 17 12 - 11 - 10 - 9 - 8 ONE 4 WORD 3 2 TRGSEL 1 0 TRGEN STARTUP 16 USER_SEL This register can only be written if the WPEN bit is cleared in the DACC Write Protection Mode Register. * TRGEN: Trigger Enable Value Name Description 0 DIS External trigger mode disabled. DACC in free-running mode. 1 EN External trigger mode enabled. * TRGSEL: Trigger Selection Value Name Description 0 TRGSEL0 External trigger 1 TRGSEL1 TIO Output of the Timer Counter Channel 0 2 TRGSEL2 TIO Output of the Timer Counter Channel 1 3 TRGSEL3 TIO Output of the Timer Counter Channel 2 4 TRGSEL4 PWM Event Line 0 5 TRGSEL5 PWM Event Line 1 6 TRGSEL6 Reserved * WORD: Word Transfer Value Name Description 0 HALF Half-word transfer 1 WORD Word transfer * ONE: Must Be Set to 1 Bit 8 must always be set to 1 when programming the DACC_MR * USER_SEL: User Channel Selection Value Name 0 CHANNEL0 Channel 0 1 CHANNEL1 Channel 1 1128 Description SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 * TAG: Tag Selection Mode Value Name Description 0 DIS Tag selection mode disabled. Using USER_SEL to select the channel for the conversion. 1 EN Tag selection mode enabled * MAXS: Maximum Speed Mode Value Name Description 0 NORMAL Normal mode 1 MAXIMUM Maximum speed mode enabled * STARTUP: Startup Time Selection Value Name Description 0 0 0 periods of peripheral clock 1 8 8 periods of peripheral clock 2 16 16 periods of peripheral clock 3 24 24 periods of peripheral clock 4 64 64 periods of peripheral clock 5 80 80 periods of peripheral clock 6 96 96 periods of peripheral clock 7 112 112 periods of peripheral clock 8 512 512 periods of peripheral clock 9 576 576 periods of peripheral clock 10 640 640 periods of peripheral clock 11 704 704 periods of peripheral clock 12 768 768 periods of peripheral clock 13 832 832 periods of peripheral clock 14 896 896 periods of peripheral clock 15 960 960 periods of peripheral clock 16 1024 1024 periods of peripheral clock 17 1088 1088 periods of peripheral clock 18 1152 1152 periods of peripheral clock 19 1216 1216 periods of peripheral clock 20 1280 1280 periods of peripheral clock 21 1344 1344 periods of peripheral clock 22 1408 1408 periods of peripheral clock 23 1472 1472 periods of peripheral clock 24 1536 1536 periods of peripheral clock 25 1600 1600 periods of peripheral clock 26 1664 1664 periods of peripheral clock 27 1728 1728 periods of peripheral clock SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1129 Value Name Description 28 1792 1792 periods of peripheral clock 29 1856 1856 periods of peripheral clock 30 1920 1920 periods of peripheral clock 31 1984 1984 periods of peripheral clock 32 2048 2048 periods of peripheral clock 33 2112 2112 periods of peripheral clock 34 2176 2176 periods of peripheral clock 35 2240 2240 periods of peripheral clock 36 2304 2304 periods of peripheral clock 37 2368 2368 periods of peripheral clock 38 2432 2432 periods of peripheral clock 39 2496 2496 periods of peripheral clock 40 2560 2560 periods of peripheral clock 41 2624 2624 periods of peripheral clock 42 2688 2688 periods of peripheral clock 43 2752 2752 periods of peripheral clock 44 2816 2816 periods of peripheral clock 45 2880 2880 periods of peripheral clock 46 2944 2944 periods of peripheral clock 47 3008 3008 periods of peripheral clock 48 3072 3072 periods of peripheral clock 49 3136 3136 periods of peripheral clock 50 3200 3200 periods of peripheral clock 51 3264 3264 periods of peripheral clock 52 3328 3328 periods of peripheral clock 53 3392 3392 periods of peripheral clock 54 3456 3456 periods of peripheral clock 55 3520 3520 periods of peripheral clock 56 3584 3584 periods of peripheral clock 57 3648 3648 periods of peripheral clock 58 3712 3712 periods of peripheral clock 59 3776 3776 periods of peripheral clock 60 3840 3840 periods of peripheral clock 61 3904 3904 periods of peripheral clock 62 3968 3968 periods of peripheral clock 63 4032 4032 periods of peripheral clock Note: Refer to the DAC electrical characteristics section in the datasheet for start-up time value. 1130 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43.7.3 DACC Channel Enable Register Name: DACC_CHER Address: 0x4003C010 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 CH1 0 CH0 This register can only be written if the WPEN bit is cleared in the DACC Write Protection Mode Register. * CHx: Channel x Enable 0: No effect 1: Enables the corresponding channel SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1131 43.7.4 DACC Channel Disable Register Name: DACC_CHDR Address: 0x4003C014 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 CH1 0 CH0 This register can only be written if the WPEN bit is cleared in the DACC Write Protection Mode Register. * CHx: Channel x Disable 0: No effect 1: Disables the corresponding channel Warning: If the corresponding channel is disabled during a conversion, or disabled then re-enabled during a conversion, the associated analog value and the corresponding EOC flags in the DACC_ISR are unpredictable. 1132 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43.7.5 DACC Channel Status Register Name: DACC_CHSR Address: 0x4003C018 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 CH1 0 CH0 * CHx: Channel x Status 0: Corresponding channel is disabled 1: Corresponding channel is enabled SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1133 43.7.6 DACC Conversion Data Register Name: DACC_CDR Address: 0x4003C020 Access: Write-only 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 2 1 0 DATA 23 22 21 20 DATA 15 14 13 12 DATA 7 6 5 4 DATA * DATA: Data to Convert When the WORD bit in DACC_MR is cleared, only DATA[15:0] is used; else DATA[31:0] is used to write two data to be converted. 1134 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43.7.7 DACC Interrupt Enable Register Name: DACC_IER Address: 0x4003C024 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 TXBUFE 2 ENDTX 1 EOC 0 TXRDY The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Enables the corresponding interrupt * TXRDY: Transmit Ready Interrupt Enable * EOC: End of Conversion Interrupt Enable * ENDTX: End of Transmit Buffer Interrupt Enable * TXBUFE: Transmit Buffer Empty Interrupt Enable SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1135 43.7.8 DACC Interrupt Disable Register Name: DACC_IDR Address: 0x4003C028 Access: Write-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 TXBUFE 2 ENDTX 1 EOC 0 TXRDY The following configuration values are valid for all listed bit names of this register: 0: No effect 1: Disables the corresponding interrupt * TXRDY: Transmit Ready Interrupt Disable. * EOC: End of Conversion Interrupt Disable * ENDTX: End of Transmit Buffer Interrupt Disable * TXBUFE: Transmit Buffer Empty Interrupt Disable 1136 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43.7.9 DACC Interrupt Mask Register Name: DACC_IMR Address: 0x4003C02C Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 TXBUFE 2 ENDTX 1 EOC 0 TXRDY The following configuration values are valid for all listed bit names of this register: 0: Corresponding interrupt is not enabled 1: Corresponding interrupt is enabled * TXRDY: Transmit Ready Interrupt Mask * EOC: End of Conversion Interrupt Mask * ENDTX: End of Transmit Buffer Interrupt Mask * TXBUFE: Transmit Buffer Empty Interrupt Mask SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1137 43.7.10 DACC Interrupt Status Register Name: DACC_ISR Address: 0x4003C030 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 TXBUFE 2 ENDTX 1 EOC 0 TXRDY * TXRDY: Transmit Ready Interrupt Flag 0: DACC is not ready to accept new conversion requests. 1: DACC is ready to accept new conversion requests. * EOC: End of Conversion Interrupt Flag 0: No conversion has been performed since the last DACC_ISR read. 1: At least one conversion has been performed since the last DACC_ISR read. * ENDTX: End of DMA Interrupt Flag 0: The Transmit Counter register has not reached 0 since the last write in DACC_TCR or DACC_TNCR. 1: The Transmit Counter register has reached 0 since the last write in DACC _TCR or DACC_TNCR. * TXBUFE: Transmit Buffer Empty 0: The Transmit Counter register has not reached 0 since the last write in DACC_TCR or DACC_TNCR. 1: The Transmit Counter register has reached 0 since the last write in DACC _TCR or DACC_TNCR. 1138 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43.7.11 DACC Analog Current Register Name: DACC_ACR Address: 0x4003C094 Access: Read/Write 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 - 14 - 13 - 12 - 11 - 10 - 9 8 IBCTLDACCORE 7 - 6 - 5 - 4 - 3 2 1 IBCTLCH1 0 IBCTLCH0 This register can only be written if the WPEN bit is cleared in the DACC Write Protection Mode Register. * IBCTLCHx: Analog Output Current Control Used to modify the slew rate of the analog output (See the product Electrical Characteristics section for further details.) * IBCTLDACCORE: Bias Current Control for DAC Core Used to modify performance versus power consumption (See the product Electrical Characteristics section for further details.) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1139 43.7.12 DACC Write Protection Mode Register Name: DACC_WPMR Address: 0x4003C0E4 Access: Read/Write 31 30 29 28 27 26 25 24 19 18 17 16 11 10 9 8 3 - 2 - 1 - 0 WPEN WPKEY 23 22 21 20 WPKEY 15 14 13 12 WPKEY 7 - 6 - 5 - 4 - * WPEN: Write Protection Enable 0: Disables the write protection if WPKEY corresponds to 0x444143 ("DAC" in ASCII). 1: Enables the write protection if WPKEY corresponds to 0x444143 ("DAC" in ASCII). See Section 43.6.7 "Register Write Protection" for the list of registers that can be write-protected. * WPKEY: Write Protection Key Value 0x444143 1140 Name PASSWD Description Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 43.7.13 DACC Write Protection Status Register Name: DACC_WPSR Address: 0x4003C0E8 Access: Read-only 31 - 30 - 29 - 28 - 27 - 26 - 25 - 24 - 23 - 22 - 21 - 20 - 19 - 18 - 17 - 16 - 15 14 13 12 11 10 9 8 3 - 2 - 1 - 0 WPVS WPVSRC 7 - 6 - 5 - 4 - * WPVS: Write Protection Violation Status 0: No write protection violation has occurred since the last read of the DACC_WPSR. 1: A write protection violation has occurred since the last read of the DACC_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC. * WPVSRC: Write Protection Violation Source When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1141 44. Electrical Characteristics 44.1 Absolute Maximum Ratings Table 44-1. Absolute Maximum Ratings* Storage Temperature.................................. -60C to + 150C Solder Temperature......................................................260C Voltage on all input pins with Respect to Ground..................-0.3V to + VDDIO + 0.4V *Notice: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Maximum Operating Voltage (VDDCORE)...................................................................1.32V Maximum Operating Voltage (VDDIO)...........................................................................4.0V Total DC Output Current on all I/O lines 100-lead LQFP............................................................150 mA 100-ball TFBGA..........................................................150 mA 100-ball VFBGA..........................................................150 mA 64-lead LQFP..............................................................100 mA 64-lead QFN................................................................100 mA 64-lead WLCSP...........................................................100 mA 44.2 Recommended Operating Conditions Table 44-2. Recommended Operating Conditions Symbol Parameter TA Min Typ Max Unit Ambient Temperature Range -40 - +105 C VDDCORE DC Supply Core 1.08 1.20 1.32 V VDDIO DC Supply I/Os 1.62 3.3 3.6 V VDDPLL PLL A, PLLB and Main Oscillator Supply 1.08 - 1.32 V Vrip(VDDIO) Supply Ripple Voltage (on VDDIO ) RMS value, 10 kHz to 10 MHz - - 30 mV Vrip(VDDPLL) Supply Ripple Voltage (on VDDPLL) RMS value, 10 kHz to 10 MHz - - 20 RMS value > 10 MHz - - 10 Vrip(VDDIN) Supply Ripple Voltage (on VDDIN) RMS value, 10 kHz to 20 MHz - - 20 fMCK Master Clock Frequency VDDCORE @ 1.20V - - 120 VDDCORE @ 1.08V - - 100 1142 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Conditions mV mV MHz 44.3 DC Characteristics The following characteristics are applicable to the operating temperature range -40C to 105C, unless otherwise specified. Table 44-3. DC Characteristics Symbol Parameter VDDCORE DC Supply Core Conditions (2) Min Typ Max Unit 1.08 1.2 1.32 V 1.62 3.3 3.6 V 1.08 - 1.32 V VDDIO DC Supply I/Os VDDPLL PLL A, PLLB and Main Oscillator Supply VIL Input Low-level Voltage PA0-PA31, PB0-PB14, PC0-PC31, NRST -0.3 - MIN [0.8V:0.3 x VDDIO] V VIH Input High-level Voltage PA0-PA31, PB0-PB14, PC0-PC31, NRST MIN[2.0V:0.7 x VDDIO] - VDDIO +0.3V V PA0-PA31, PB0-PB9, PB12-PB14, PC0-PC31 VDDIO - 0.4V - - VOH Output High-level Voltage VDDIO -0.15V - - - - - - - 0.15 150 - - VDDIO [3.0V-3.6V] PB10-PB11 PA0-PA31, PB0-PB9, PB12-PB14, PC0-PC31 VOL Output Low-level Voltage VDDIO [3.0V-3.6V] PB10-PB11 Vhys Hysteresis Voltage PA0-PA31, PB0-PB9, PB12-PB14, PC0-PC31 (Hysteresis mode enabled) V V mV VDDIO [1.65V-3.6V]; VOH = VDDIO - 0.4 IOH Source Current - PA14 (SPCK), PA29 (MCCK) pins -4 - PA[12-13], PA[26-28], PA[30-31] pins -4 - PA[0-3] - NRST - - - Other pins(1) -2 -2 mA -2 VDDIO [3.0V-3.6V] - PB[10-11] -30 VDDIO [1.65V-3.6V]; VOL = 0.4V IOL Sink Current - PA14 (SPCK), PA29 (MCCK) pins 4 - PA[12-13], PA[26-28], PA[30-31] pins 4 - PA[0-3] - NRST - - - Other pins(1) 2 2 mA 2 VDDIO [3.0V-3.6V] - PB[10-11] IIL Input Low IIH Input High RPULLUP Pull-up Resistor 30 Pull_up OFF -1 - 1 Pull_up ON 10 - 50 Pull-down OFF -1 - 1 Pull-down ON 10 - 50 PA0-PA31, PB0-PB14, PC0-PC31, NRST 70 100 130 k SAM4S Series [DATASHEET] 1143 Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 A A Table 44-3. Symbol DC Characteristics (Continued) Parameter RPULLDOWN Pull-down Resistor RODT ICC ICC33 Note: 1144 On-die Series Termination Resistor Flash Active Current on VDDCORE Flash Active Current on VDDIO Conditions Min Typ Max Unit PA0-PA31, PB0-PB14, PC0-PC31, NRST 70 100 130 k PA4-PA31, PB0-PB9, PB12-PB14, PC0-PC31 - 36 - PA0-PA3 - 18 - Random 144-bit Read @ 25C: Maximum read frequency at VDDCORE = 1.2V, VDDIO = 3.3V - 16 25 Random 72-bit Read @ 25C: Maximum read frequency at VDDCORE = 1.2V, VDDIO = 3.3V - 10 18 Program(3) onto VDDCORE = 1.2V, VDDIO = 3.3V @ 25C - 3 5 Random 144-bit read: Maximum read frequency at VDDCORE = 1.2V, VDDIO = 3.3V @ 25C - 3 16 Random 72-bit read: Maximum read frequency at VDDCORE = 1.2V, VDDIO = 3.3V @ 25C - 3 5 Program(3) onto VDDCORE = 1.2V, - 10 VDDIO = 3.3V @ 25C 1. PA[4-11], PA[15-25], PB[0-9], PB[12-14], PC[0-31] 2. Refer to Section 5.2.2 "VDDIO Versus VDDIN" 3. The Flash programming characteristics are applicable at operating temperature range: TA = -40 to 85 C. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 15 mA mA Table 44-4. Symbol 1.2V Voltage Regulator Characteristics Parameter Conditions Min Typ Max Unit VDDIN DC Input Voltage (4) 1.6 3.3 3.6 V Normal Mode - 1.2 - VDDOUT DC Output Voltage Standby Mode - 0 - VO(accuracy) Output Voltage Accuracy ILOAD = 0.8mA to 80mA (after trimming) -3 - 80 Maximum DC Output Current VDDIN > 1.8V - ILOAD VDDIN 1.8V - - 40 ILOAD-START Maximum Peak Current during Startup (3) - - 400 VDROPOUT Dropout Voltage VDDIN = 1.6V, ILOAD = Max - 400 - VLINE Line Regulation VDDIN from 2.7V to 3.6V; ILOAD MAX - 10 30 VLINE-TR Transient Line Regulation VDDIN from 2.7V to 3.6V; tr = tf = 5s; ILOAD Max - 50 150 VLOAD Load Regulation VDDIN 1.8V; ILOAD = 10% to 90% MAX - 20 40 mV VLOAD-TR Transient Load Regulation VDDIN 1.8V; ILOAD = 10% to 90% MAX; tr = tf = 5 s - 50 150 mV Normal Mode, ILOAD = 0 mA - 5 - Quiescent Current Normal Mode, ILOAD = 80 mA - 500 - Standby Mode - 500 1 Input Decoupling Capacitor (1) - 4.7 - F (2) 1.85 2.2 5.9 F 10 IQ CDIN V 3 % mA mV mV A CDOUT Output Decoupling Capacitor ton Turn-on Time CDOUT = 2.2F, VDDOUT reaches 1.2V ( 3%) - 300 - s toff Turn-off Time CDOUT = 2.2F - - 40 ms Notes: ESR 0.1 1. A 4.7F or higher ceramic capacitor must be connected between VDDIN and the closest GND pin of the device. This large decoupling capacitor is mandatory to reduce startup current, improving transient response and noise rejection. 2. To ensure stability, an external 2.2 F output capacitor, CDOUT must be connected between the VDDOUT and the closest GND pin of the device. The ESR (Equivalent Series Resistance) of the capacitor must be in the range 0.1 to 10 . Solid tantalum, and multilayer ceramic capacitors are all suitable as output capacitor. A 100 nF bypass capacitor between VDDOUT and the closest GND pin of the device helps decrease output noise and improves the load transient response. 3. Defined as the current needed to charge external bypass/decoupling capacitor network. 4. See Section 5.2.2 "VDDIO Versus VDDIN" SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1145 Table 44-5. Symbol Core Power Supply Brownout Detector Characteristics Parameter Conditions Min Typ Max Unit 0.98 1.0 1.04 V - - 110 mV 0.8 1.0 1.08 V VDDIO rising from 0 to 1.2V 10% 90 - 320 s Brownout Detector enabled - - 24 Brownout Detector disabled - - 2 Brownout Detector enabled - - 24 Brownout Detector disabled - - 2 (1) VT- Supply Falling Threshold Vhys Hysteresis Voltage VT+ Supply Rising Threshold tRST Reset Period IDDON Current Consumption on VDDCORE IDDOFF IDD33ON A Current Consumption on VDDIO A IDD33OFF td- VT- Detection Propagation Time VDDCORE = VT+ to (VT- - 100mV) - 200 300 ns tSTART Startup Time From disabled state to enabled state - - 300 s Note: 1. The product is guaranteed to be functional at VTFigure 44-1. Core Brownout Output Waveform VDDCORE VT+ VTt BOD OUTPUT td- td+ t Table 44-6. VDDIO Supply Monitor Symbol Parameter Conditions Min Typ Max Unit VT Supply Monitor Threshold 16 selectable steps 1.6 - 3.4 V VT(accuracy) Threshold Level Accuracy [-40/+105C] -2.5 - +2.5 % Vhys Hysteresis Voltage - - 20 30 mV Enabled - 23 40 Disabled - 0.02 2 From disabled state to enabled state - - 300 IDDON Current Consumption IDDOFF tSTART 1146 Startup Time SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 A s Table 44-7. Threshold Selection Digital Code Threshold Min (V) Threshold Typ (V) Threshold Max (V) 0000 1.56 1.6 1.64 0001 1.68 1.72 1.76 0010 1.79 1.84 1.89 0011 1.91 1.96 2.01 0100 2.03 2.08 2.13 0101 2.15 2.2 2.23 0110 2.26 2.32 2.38 0111 2.38 2.44 2.50 1000 2.50 2.56 2.62 1001 2.61 2.68 2.75 1010 2.73 2.8 2.87 1011 2.85 2.92 2.99 1100 2.96 3.04 3.12 1101 3.08 3.16 3.24 1110 3.20 3.28 3.36 1111 3.32 3.4 3.49 Figure 44-2. VDDIO Supply Monitor VDDIO VT + Vhys VT Reset SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1147 Table 44-8. Zero-Power-on Reset Characteristics Symbol Parameter Conditions Min Typ Max Unit VT+ Threshold Voltage Rising At startup 1.45 1.53 1.59 V VT- Threshold Voltage Falling - 1.35 1.45 1.55 V tRST Reset Period - 100 340 580 s Figure 44-3. Zero-Power-on Reset Characteristics VDDIO VT+ VT- Reset 1148 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.4 Power Consumption Power consumption of the device according to the different low-power mode capabilities (Backup, Wait, Sleep) and Active mode Power consumption on power supply in different modes: Backup, Wait, Sleep and Active Power consumption by peripheral: calculated as the difference in current measurement after having enabled then disabled the corresponding clock All power consumption values are based on characterization. Power consumption values are not covered by test limits in production. 44.4.1 Backup Mode Current Consumption The Backup mode configuration and measurements are defined as follows. Figure 44-4. Measurement Setup AMP1 3.3V VDDIO VDDIN Voltage Regulator VDDOUT VDDCORE VDDPLL 44.4.1.1 Configuration A: Embedded Slow Clock RC Oscillator Enabled Supply Monitor on VDDIO is disabled RTC is running RTT is enabled on 1Hz mode BOD disabled One WKUPx enabled Current measurement on AMP1 (see Figure 44-4) 44.4.1.2 Configuration B: 32.768 kHz Crystal Oscillator Enabled Supply Monitor on VDDIO is disabled RTC is running RTT is enabled on 1Hz mode BOD disabled One WKUPx enabled Current measurement on AMP1 (see Figure 44-4) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1149 Table 44-9. Typical Power Consumption for Backup Mode (SAM4S4/S2 rev A) @ 25C @ 85C @ 105C Conditions (AMP1) Configuration A (AMP1) Configuration B (AMP1) Configuration A (AMP1) Configuration A VDDIO = 3.6V 1.9 1.8 6.8 14.6 VDDIO = 3.3V 1.7 1.6 6.2 13.4 VDDIO = 3.0V 1.5 1.4 5.7 12.5 VDDIO = 2.5V 1.3 1.2 5.1 11.3 VDDIO = 1.8V 0.9 0.8 4.4 9.9 Table 44-10. @ 85C @ 105C Conditions (AMP1) Configuration A (AMP1) Configuration B (AMP1) Configuration A (AMP1) Configuration A VDDIO = 3.6V 2.1 2.0 13.9 22.5 VDDIO = 3.3V 1.8 1.8 - - VDDIO = 3.0V 1.7 1.6 - - VDDIO = 2.5V 1.3 1.3 - - VDDIO = 1.8V 0.9 0.9 - - Unit A Typical Power Consumption for Backup Mode (SAM4S16/S8 rev A) @ 25C @ 85C @ 105C Conditions (AMP1) Configuration A (AMP1) Configuration B (AMP1) Configuration A (AMP1) Configuration A VDDIO = 3.6V 2.7 2.5 12.1 20.1 VDDIO = 3.3V 2.0 1.8 - - VDDIO = 3.0V 1.8 1.7 - - VDDIO = 2.5V 1.5 1.4 - - VDDIO = 1.8V 1 0.9 - - 1150 A Typical Power Consumption for Backup Mode (SAM4SD32/SD16/SA16 rev A) @ 25C Table 44-11. Unit SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Unit A 44.4.2 Sleep and Wait Mode Current Consumption The Wait mode and Sleep mode configuration and measurements are defined below. Figure 44-5. Measurement Setup for Sleep Mode AMP2 3.3V VDDIO VDDIN Voltage Regulator VDDOUT AMP1 VDDCORE VDDPLL 44.4.2.1 Sleep Mode Core clock off VDDIO = VDDIN = 3.3V Master clock (MCK) running at various frequencies with PLLA or the fast RC oscillator Fast start-up through pins WKUP0-15 Current measurement as shown in Figure 44-5 All peripheral clocks deactivated TA = 25C Figure 44-6. SAM4S4/2 Current Consumption in Sleep Mode (AMP1) vs Master Clock Ranges (refer to Table 44-12) Sleep Mode SAM4S4/S2 8.000 6.000 ID DCORE 4.000 2.000 0.000 0 10 20 30 40 50 60 MHz 70 80 90 100 110 120 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1151 Table 44-12. SAM4S4/S2 Typical Sleep Mode Current Consumption vs Master Clock (MCK) Variation with PLLA Typical Value @ 25C Core Clock/MCK (MHz) VDDCORE Consumption (AMP1) Total Consumption (AMP2) 120 5.1 6.9 100 4.3 5.8 84 3.7 5.0 64 2.8 3.9 32 1.5 2.2 24 1.2 1.8 Unit mA Table 44-13. SAM4S4/2 Typical Sleep Mode Current Consumption vs Master Clock (MCK) Variation with Fast RC Typical Value @ 25C Core Clock/MCK (MHz) VDDCORE Consumption (AMP1) Total Consumption (AMP2) 12 0.6 0.8 8 0.4 0.7 4 0.2 0.5 2 0.17 0.41 1 0.13 0.34 0.5 0.11 0.35 Unit mA 1152 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Figure 44-7. SAM4S16/S8 Current Consumption in Sleep Mode (AMP1) vs Master Clock Ranges (refer to Table 44-14) Sleep Mode SAM4S16/S8 12.000 10.000 8.000 ID DCORE 6.000 4.000 2.000 0.000 0 Table 44-14. 10 20 30 40 50 60 MHz 70 80 90 100 110 120 SAM4S16/S8 Typical Sleep Mode Current Consumption vs Master Clock (MCK) Variation with PLLA Typical Value @ 25C Core Clock/MCK (MHz) VDDCORE Consumption (AMP1) Total Consumption (AMP2) 120 8.1 9.6 100 7.1 8.1 84 6.0 6.8 64 4.7 5.2 48 3.5 3.9 32 2.4 2.6 24 1.8 2.0 Unit mA SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1153 Table 44-15. SAM4S16/S8 Typical Sleep Mode Current Consumption vs Master Clock (MCK) Variation with Fast RC Typical Value @ 25C Core Clock/MCK (MHz) VDDCORE Consumption (AMP1) Total Consumption (AMP2) 12 1.1 1.5 8 0.7 1.2 4 0.4 0.7 2 0.3 0.7 1 0.2 0.5 0.5 0.2 0.4 Unit mA Figure 44-8. SAM4SD32/SD16/SA16 Typical Current Consumption in Sleep Mode (AMP1) vs Master Clock Ranges (refer to Table 44-16) Sleep Mode SAM4SD32/SD16/SA16 9.00 8.00 7.00 6.00 5.00 IDDCORE 4.00 3.00 2.00 1.00 0.00 0 20 40 60 80 MHz 1154 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 100 120 140 Table 44-16. SAM4SD32/SD16/SA16 Typical Sleep Mode Current Consumption vs Master Clock (MCK) Variation with PLLA Typical Value @ 25C Core Clock/MCK (MHz) VDDCORE Consumption (AMP1) Total Consumption (AMP2) 120 8.4 10.6 100 7.1 8.9 84 6.0 7.5 64 4.6 5.8 48 3.5 4.4 32 2.4 3.1 24 1.8 2.4 Table 44-17. Unit mA SAM4SD32/SD16/SA16 Typical Sleep Mode Current Consumption vs Master Clock (MCK) Variation with Fast RC Typical Value @ 25C Core Clock/MCK (MHz) VDDCORE Consumption (AMP1) Total Consumption (AMP2) 12 1.1 1.8 8 0.8 1.2 4 0.4 0.7 2 0.3 0.7 1 0.2 0.5 0.5 0.2 0.5 Unit mA 44.4.2.2 Wait Mode Figure 44-9. Measurement Setup for Wait Mode AMP2 3.6V VDDIO VDDIN AMP1 Voltage Regulator VDDOUT VDDCORE VDDPLL VDDIO = VDDIN = 3.6V Core clock and master clock stopped Current measurement as shown in the above figure BOD disabled All peripheral clocks deactivated Table 44-18 gives current consumption in typical conditions. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1155 Table 44-18. SAM4S4/S2 Typical Current Consumption in Wait Mode @ 25C Conditions @ 85C @ 105C VDDOUT Consumption (AMP1) Total Consumption (AMP2) Total Consumption (AMP2) Total Consumption (AMP2 14.9 28.4 211 436 Unit See Figure 44-9 on page 1155 There is no activity on the I/Os of the device. With the Flash in standby mode A See Figure 44-9 on page 1155 There is no activity on the I/Os of the device. With the Flash in deep power down mode Table 44-19. 14.9 24.1 205 432 @ 85C @ 105C SAM4S16/S8 Typical Current Consumption in Wait Mode @ 25C Conditions VDDOUT Consumption (AMP1) Total Consumption (AMP2) Total Consumption (AMP2) Total Consumption (AMP2 20.5 32.7 344 654 Unit See Figure 44-9 on page 1155 There is no activity on the I/Os of the device. With the Flash in standby mode A See Figure 44-9 on page 1155 There is no activity on the I/Os of the device. With the Flash in deep power down mode Table 44-20. 20.5 27.8 438 589 @ 85C @ 105C SAM4SD32/SD16/SA16 Typical Current Consumption in Wait Mode @ 25C Conditions VDDOUT Consumption (AMP1) Total Consumption (AMP2) Total Consumption (AMP2 Total Consumption (AMP2 - 42.1 633 1105 Unit See Figure 44-9 on page 1155 There is no activity on the I/Os of the device. With the Flash in standby mode A See Figure 44-9 on page 1155 There is no activity on the I/Os of the device. With the Flash in deep power down mode 1156 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 - 35.3 608 1085 44.4.3 Active Mode Power Consumption The active mode configuration and measurements are defined as follows: VDDIO = VDDIN = 3.3V VDDCORE = 1.2V (internal voltage regulator used) TA = 25C Application running from Flash memory with128-bit access mode All peripheral clocks are deactivated. Master Clock (MCK) running at various frequencies with PLLA or the fast RC oscillator. Current measurement on AMP1 (VDDCORE) and total current on AMP2 Figure 44-10. Active Mode Measurement Setup AMP2 3.3V VDDIO VDDIN Voltage Regulator VDDOUT AMP1 VDDCORE VDDPLL The following tables give Active mode current consumption in typical conditions. VDDCORE at 1.2V TA = 25C SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1157 44.4.3.1 SAM4S4/2 Active Power Consumption Table 44-21. SAM4S4/2 Active Power Consumption with VDDCORE @ 1.2V Running from Flash Memory or SRAM CoreMark 128-bit Flash access (1) 64-bit Flash access(1) SRAM Core Clock (MHz) AMP1 AMP2 AMP1 AMP2 AMP2 120 17.7 21.2 12.8 16.4 16.2 100 16.1 19.4 11.6 14.8 13.5 84 13.6 16.8 9.9 13.1 12.0 64 11.6 14.6 8.5 10.9 9.0 32 7.3 9.8 5.8 8.0 5.2 24 6.0 8.3 5.2 7.4 3.9 12 3.6 5.2 2.7 4.1 2.2 8 2.4 4.6 2.2 3.5 1.5 4 1.5 2.3 1.2 2.8 1.0 2 0.7 1.8 0.6 1.9 0.8 1 0.4 1.1 0.3 1.2 0.7 0.5 0.2 0.9 0.2 0.9 0.6 Unit mA Note: 1. Flash Wait State (FWS) in EEFC_FMR adjusted versus core frequency 44.4.3.2 SAM4S16/S8 Active Power Consumption Table 44-22. SAM4S16/S8 Active Power Consumption with VDDCORE @ 1.2V Running from Flash Memory or SRAM CoreMark 128-bit Flash access(1) 64-bit Flash access(1) SRAM Core Clock (MHz) AMP1 AMP2 AMP1 AMP2 AMP2 120 24.9 28.8 18 21.4 19.6 100 21.9 25.4 16.3 19.5 16.5 84 18.5 21.4 13.8 16.6 13.9 64 15.0 17.6 11.4 13.9 10.7 48 11.9 14.3 9.6 11.8 8 32 8.1 9.9 7.4 9.3 5.4 24 6.0 7.7 5.8 7.5 4.1 12 3.4 6.1 3.2 6.0 2 8 2.3 4.5 2.2 4.5 1.2 4 1.2 2.6 1.2 2.9 1.2 2 0.7 1.9 0.7 2.0 0.7 1 0.4 1.3 0.4 1.6 - 0.5 0.3 1.1 0.3 1.3 - Note: 1158 1. Flash Wait State (FWS) in EEFC_FMR adjusted versus core frequency SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Unit mA Figure 44-11. SAM4S16/S8 Current Consumption in Active Mode (AMP1) versus Master Clock Ranges 30 25 20 IDDCORE (mA) 15 128 -bit Flash access 64-b it Flash access(1) 10 SRAM 5 0 0 50 100 150 Frequency MHz SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1159 44.4.3.3 SAM4SD32/SD16/SA16 Active Power Consumption Table 44-23. SAM4SD32/SA16/SD16 Active Power Consumption with VDDCORE @ 1.2V running from Flash Memory (IDDCORE- AMP1) or SRAM CoreMark Cache Enable (CE) Cache Disable (CD) Core Clock (MHz) 128-bit Flash access(1) 64-bit Flash access(1) 128-bit Flash access(1) 64-bit Flash access(1) SRAM 120 20.7 20.7 24.8 18.1 19.9 100 17.5 17.4 21.6 16.5 16.8 84 14.7 14.7 18.3 13.9 14.2 64 11.3 11.3 14.4 11.5 10.9 48 8.5 8.5 11.3 9.4 8.3 32 5.7 5.7 8.0 7.1 5.6 24 4.3 4.3 6.3 5.9 4.2 12 2.5 2.5 3.5 3.3 1.9 8 1.7 1.7 2.4 2.3 1.7 4 0.9 0.9 1.2 1.2 0.7 2 0.5 0.5 0.7 0.7 0.5 1 0.4 0.4 0.5 0.5 0.4 0.5 0.3 0.3 0.3 0.3 0.3 Note: Unit mA 1. Flash Wait State (FWS) in EEFC_FMR adjusted versus core frequency Figure 44-12. SAM4SD32/SD16/SA16 Current Consumption in Active Mode (AMP1) versus Master Clock Ranges 25.0 20.0 Flash128 (CD) mA 15.0 Flash64 (CE) mA Flash128 (CE) mA 10.0 Flash64 (CD) mA SRAM mA 5.0 0.0 0 1160 20 40 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 60 80 100 120 Table 44-24. SAM4SD32/SA16/SD16 Typical Active Power Consumption with VDDCORE@ 1.2V running from Flash Memory (AMP2) or SRAM CoreMark Cache Enable (CE) Note: Cache Disable (CD) Core Clock (MHz) 128-bit Flash access(1) 64-bit Flash access(1) 128-bit Flash access(1) 64-bit Flash access(1) SRAM 120 23.2 23.2 27.8 20.9 22.1 100 19.6 19.6 25.3 19.0 18.5 84 16.6 16.5 21.6 16.2 15.7 64 12.8 12.8 18.0 13.7 12.1 48 9.7 9.7 14.9 11.9 9.2 32 6.7 6.7 11.2 9.5 6.3 24 5.2 5.2 9.5 8.4 4.9 12 2.5 2.5 5.4 4.6 2.4 8 1.8 1.8 4.5 3.9 1.7 4 1.1 1.1 2.8 2.8 1.0 2 0.7 0.7 2.0 2.0 0.7 1 0.5 0.5 1.2 1.2 0.5 0.8 0.4 0.5 0.4 0.4 0.8 1. Flash Wait State (FWS) in EEFC_FMR adjusted versus core frequency SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Unit mA 1161 44.4.4 Peripheral Power Consumption in Active Mode Table 44-25. Typical Power Consumption on VDDCORE (VDDIO = 3.3V, TA = 25C) Consumption VDDCORE 1.08V Consumption VDDCORE 1.2V Consumption VDDCORE 1.32V PIO Controller A (PIOA) 4.2 4.7 5.3 PIO Controller B (PIOB) 1.2 1.4 1.5 PIO Controller C (PIOC) 2.6 3.0 3.2 UART 3.8 4.2 4.6 USART 5.6 6.2 7.0 PWM 10.2 11.5 12.5 TWI 4.0 4.4 5.0 SPI 4.2 4.7 5.1 Timer Counter (TCx) 4.2 4.7 5.2 ADC 2.9 3.3 3.6 DACC 2.7 3.1 3.4 ACC 0.4 0.5 0.6 HSMCI 5.5 6.1 6.8 CRCCU 0.2 0.3 0.3 SMC 1.9 2.1 2.3 SSC 4.9 5.4 6.2 UDP 4.7 5.2 5.8 Peripheral 1162 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Unit A/MHz 44.5 Oscillator Characteristics 44.5.1 32 kHz RC Oscillator Characteristics Table 44-26. 32 kHz RC Oscillator Characteristics Symbol Parameter fOSC Conditions Min Typ Max Unit RC Oscillator Frequency 20 32 44 kHz Frequency Supply Dependency -3 - 3 %/V -7 - 7 % Frequency Temperature Dependency Over temperature range (-40 to 105 C) versus TA 25C Duty Duty Cycle 45 50 55 % tSTART Startup Time - - 100 s IDDON Current Consumption - 540 860 nA After startup time Temp. range = -40 to 125 C Typical consumption at 2.2V supply and TA 25C 44.5.2 4/8/12 MHz RC Oscillators Characteristics Table 44-27. Symbol 4/8/12 MHz RC Oscillators Characteristics Parameter Conditions fOSC RC Oscillator Frequency Range (1) 4 ACC4 4 MHz Total Accuracy -40C < Temp < +105C 4 MHz output selected (1)(2) - ACC8 8 MHz Total Accuracy -40C < Temp < +105C 8 MHz output selected (1)(3) ACC12 12 MHz Total Accuracy -40C < Temp < +105C 12 MHz output selected (1)(3) Frequency Deviation versus Trimming Code 8 MHz 12 MHz Min Max Unit 12 MHz - 30 % - - 5 % - - 5 % - kHz/trimming code - Typ 47 64 Duty Duty Cycle 45 50 55 % tSTART Startup Time - - 10 s 50 75 4 MHz IDDON (2) Active Current Consumption 8 MHz 12 MHz Notes: - 65 95 82 118 A 1. Frequency range can be configured in the Supply Controller registers 2. Not trimmed from factory 3. After trimming from factory The 4/8/12 MHz Fast RC oscillator is calibrated in production. This calibration can be read through the Get CALIB bit command (refer to the EEFC section) and the frequency can be trimmed by software through the PMC. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1163 44.5.3 32.768 kHz Crystal Oscillator Characteristics Table 44-28. 32.768 kHz Crystal Oscillator Characteristics Symbol Parameter Conditions fOSC Operating Frequency Normal mode with crystal Duty Cycle Ccrystal = 12.5 pF RS < 50 k (1) Ccrystal = 6 pF Startup Time tSTART RS < 100 k (1) RS < 100 k (1) PON Drive Level Rf Internal Resistor CLEXT Maximum External Capacitor on XIN32 and XOUT32 Ccrystal Allowed Crystal Capacitance Load Cpara Internal Parasitic Capacitance Note: Max Unit - - 32.768 kHz 40 50 60 % - - - Ccrystal = 6 pF - 900 300 1200 500 550 1150 380 980 820 1600 530 1350 - - 0.1 W - 10 - M - - 20 pF 6 - 12.5 pF 0.6 0.7 0.8 pF - Ccrystal = 6 pF Current Consumption IDDON Typ ms Ccrystal = 12.5 pF Ccrystal = 12.5 pF RS < 50 k (1) Min nA Ccrystal = 12.5 pF - Ccrystal = 6 pF Between XIN32 and XOUT32 From crystal specification 1. RS is the series resistor. Figure 44-13. 32.768 kHz Crystal Oscillator Schematic SAM4 XOUT32 XIN32 CLEXT Ccrystal CLEXT CLEXT = 2 x (Ccrystal - Cpara - CPCB) where: CPCB is the capacitance of the printed circuit board (PCB) track layout from the crystal to the SAM4 pin. 44.5.4 32.768 kHz Crystal Characteristics Table 44-29. 1164 Crystal Characteristics Symbol Parameter Conditions Min Typ Max Unit ESR Equivalent Series Resistor (RS) Crystal @ 32.768 kHz - 50 100 k Cm Motional Capacitance Crystal @ 32.768 kHz 0.6 - 3 fF CSHUNT Shunt Capacitance Crystal @ 32.768 kHz 0.6 - 2 pF SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.5.5 32.768 kHz XIN32 Clock Input Characteristics in Bypass Mode Table 44-30. Symbol XIN32 Clock Electrical Characteristics (In Bypass Mode) Parameter Conditions Min Max Unit 44 kHz XIN32 Clock Frequency (1) tCPXIN32 XIN32 Clock Period (1) 22 s tCHXIN32 XIN32 Clock High Half-period (1) 11 s tCLXIN32 XIN32 Clock Low Half-period (1) 11 s tCLCH Rise Time 400 ns tCHCL Fall Time 400 ns Ci XIN32 Input Capacitance RIN XIN32 Pull-down Resistor VXIN32_IL VXIN32_IH 1/(tCPXIN32) Note: 1. 6 pF 3 5 M VXIN32 Input Low-level Voltage -0.3 0.3 x VDDIO V VXIN32 Input High-level Voltage 0.7 x VDDIO VDDIO + 0.3 V These characteristics apply only when the 32.768 kHz crystal oscillator is in Bypass mode (i.e., when OSCBYPASS = 1 in SUPC_MR and XTALSEL = 1 in SUPC_CR). Figure 44-14. XIN32 Clock Timing tCHCL tCLCH tCHXIN32 VXIN32_IH VXIN32_IL tCLXIN32 tCPXIN32 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1165 44.5.6 3 to 20 MHz Crystal Oscillator Characteristics Table 44-31. 3 to 20 MHz Crystal Oscillator Characteristics Symbol Parameter Conditions fOSC Operating Frequency Normal mode with crystal Duty Cycle tSTART Typ Max Unit 3 16 20 MHz 40 50 60 % 3 MHz, CSHUNT = 3 pF 14.5 8 MHz, CSHUNT = 7 pF 4 16 MHz, CSHUNT = 7 pF with Cm = 8 fF Startup Time Min - - 1 20 MHz, CSHUNT = 7 pF 3 MHz Current Consumption (on VDDIO) 8 MHz - 16 MHz 20 MHz 230 350 300 400 390 470 450 560 3 MHz PON Drive Level - - 16 MHz, 20 MHz Internal Resistor CLEXT Maximum External Capacitor on XIN and XOUT Ccrystal Allowed Crystal Capacitance Load CLOAD Internal Equivalent Load Capacitance A 15 8 MHz Rf ms 2.5 16 MHz, CSHUNT = 7 pF with Cm = 1.6 fF IDDON 1.4 30 W 50 - 0.5 - M - - 17 pF From crystal specification 12.5 - 17.5 pF Integrated load capacitance (XIN and XOUT in series) 7.5 9.5 10.5 pF Between XIN and XOUT Figure 44-15. 3 to 20 MHz Crystal Oscillator Schematic SAM4 CLOAD XOUT XIN R = 1K if crystal frequency is lower than 8 MHz CLEXT Ccrystal CLEXT CLEXT = 2 x (Ccrystal - CLOAD - CPCB). Where CPCB is the capacitance of the printed circuit board (PCB) track layout from the crystal to the SAM4 pin. 1166 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.5.7 3 to 20 MHz Crystal Characteristics Table 44-32. Symbol ESR 3 to 20 MHz Crystal Characteristics Parameter Conditions Equivalent Series Resistor (Rs) Min Typ Max Fundamental @ 3 MHz 200 Fundamental @ 8 MHz 100 - Fundamental @ 12 MHz 80 - Fundamental @ 16 MHz 80 Fundamental @ 20 MHz 50 Unit Cm Motional Capacitance - - 8 fF CSHUNT Shunt Capacitance - - 7 pF 44.5.8 3 to 20 MHz XIN Clock Input Characteristics in Bypass Mode Table 44-33. Symbol XIN Clock Electrical Characteristics (In Bypass Mode) Parameter Conditions Min Typ Max Unit - - 50 MHz 1/(tCPXIN) XIN Clock Frequency (1) tCPXIN XIN Clock Period (1) 20 - - ns XIN Clock High Half-period (1) 8 - - ns XIN Clock Low Half-period (1) 8 - - ns tCLCH Rise Time (1) 2.2 - - ns tCHCL Fall Time (1) 2.2 - - ns VXIN Input Low-level Voltage (1) -0.3 - [0.8V:0.3 x VDDIO] V VXIN_IH VXIN Input High-level Voltage (1) [2.0V:0.7 x VDDIO] - VDDIO + 0.3V V Cpara(standby) Internal Parasitic Capacitance During Standby (1) - 5.5 6.3 pF Rpara(standby) Internal Parasitic Resistance During Standby (1) - 300 - tCHXIN tCLXIN VXIN_IL Note: 1. These characteristics apply only when the 3-20 MHz crystal oscillator is in Bypass mode. Figure 44-16. XIN Clock Timing tCHCL tCLCH tCHXIN VXIN_IH VXIN_IL tCLXIN tCPXIN SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1167 44.5.9 Crystal Oscillator Design Considerations Information 44.5.9.1 Choosing a Crystal When choosing a crystal for the 32.768 kHz Slow Clock Oscillator or for the 3-20 MHz Oscillator, several parameters must be taken into account. Important parameters of crystal and SAM4S specifications are as follows: Load Capacitance Ccrystal is the equivalent capacitor value the oscillator must "show" to the crystal in order to oscillate at the target frequency. The crystal must be chosen according to the internal load capacitance (CLOAD) of the onchip oscillator. Any mismatch in the load capacitance will result in a frequency drift. Drive Level Crystal drive level Oscillator drive level. Having a crystal drive level number lower than the oscillator specification may damage the crystal. Equivalent Series Resistor (ESR) Crystal ESR Oscillator ESR Max. Having a crystal with ESR value higher than the oscillator may cause the oscillator to not start. Shunt Capacitance Max. crystal Shunt Capacitance Oscillator Shunt Capacitance (CSHUNT). Having a crystal with ESR value higher than the oscillator may cause the oscillator to not start. 44.5.9.2 Printed Circuit Board (PCB) SAM4S oscillators are low-power oscillators requiring particular attention when designing PCB systems. 1168 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.6 PLLA, PLLB Characteristics Table 44-34. Supply Voltage Phase Lock Loop Characteristics Symbol Parameter VDDPLLR Supply Voltage Range Table 44-35. Conditions Min Typ Max Unit 1.08 1.2 1.32 V Min Typ Max Unit PLLA and PLLB Characteristics Symbol Parameter Conditions fIN Input Frequency 3 - 32 MHz fOUT Output Frequency 80 - 240 MHz 0.94 1.2 1.2 1.5 2.1 2.5 3.34 4 60 150 Active mode @ 80 MHz @ 1.2V IPLL Current Consumption Active mode @ 96 MHz @ 1.2V Active mode @ 160 MHz @ 1.2V - Active mode @ 240 MHz @ 1.2V ts Settling Time - SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 mA s 1169 44.7 USB Transceiver Characteristics 44.7.1 Typical Connection For details on a typical connection, refer to Section 40. "USB Device Port (UDP)". 44.7.2 USB Electrical Characteristics Table 44-36. Symbol USB Electrical Characteristics Parameter Conditions Min Typ Max Unit Input Levels VIL Low Level - - 0.8 V VIH High Level 2.0 - - V VDI Differential Input Sensitivity 0.2 - - V VDICR Differential Input Common Mode Range 0.8 - 2.5 V Ci Transceiver Capacitance Capacitance to ground on each line - - 9.18 pF Ilkg Hi-Z State Data Line Leakage 0V < VI < 3.3V -10 - +10 A REXT Recommended External USB Series Resistor In series with each USB pin with 5 % - 27 - |(D+) - (D-)| Output Levels VOL Low Level Output Measured with RL of 1.425 k tied to 3.6V 0.0 - 0.3 V VOH High Level Output Measured with RL of 14.25 k tied to GND 2.8 - 3.6 V VCRS Output Signal Crossover Voltage Measurement conditions described in Figure 44-17 "USB Data Signal Rise and Fall Times" 1.3 - 2.0 V - 105 200 A - 80 150 A Consumption IVDDIO Current Consumption IVDDCORE Current Consumption Transceiver enabled in input mode DDP = 1 and DDM = 0 Pull-up Resistor RPUI Bus Pull-up Resistor on Upstream Port (idle bus) 0.900 - 1.575 k RPUA Bus Pull-up Resistor on Upstream Port (upstream port receiving) 1.425 - 3.090 k 44.7.3 Switching Characteristics Table 44-37. 1170 In Full Speed Symbol Parameter Conditions tr Transition Rise Time tf Transition Fall Time trfm Rise/Fall Time Matching SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Min Typ Max Unit CLOAD = 50 pF 4 - 20 ns CLOAD = 50 pF 4 - 20 ns 90 - 111.11 % Figure 44-17. USB Data Signal Rise and Fall Times Rise Time Fall Time 90% VCRS 10% Differential Data Lines 10% tr tf (a) REXT = 27 fOSC = 6 MHz/750 kHz Buffer CLOAD (b) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1171 44.8 12-bit ADC Characteristics Electrical data are in accordance with the following standard conditions unless otherwise specified: Operating temperature range from -40C to + 105C Min and max data are defined as three times the standard deviation of the manufacturing process 44.8.1 ADC Power Supply Table 44-38. Analog Power Supply Characteristics Symbol Parameter VDDIN Supply Voltage Range Conditions Min Typ Max Full operational 2.4 - 3.6 2 - 2.4 2 4 A 2.4 3.5 mA 4.3 6 mA - 0.1 A 0.2 0.4 mA V (1) ADC Sleep Mode(2) Analog Current Consumption IVDDIN ADC Fast Wake-up Mode (3) - ADC Normal Mode IVDDcore Notes: 44.8.1.1 ADC Sleep Mode (all off) Digital Current Consumption 1. 2. 3. Unit (2) ADC Normal Mode - See Section "Low Voltage Supply". In Sleep mode the ADC core, sample and hold, and internal reference operational amplifier are off. In Fast Wake-up mode, only the ADC core is off. ADC Bias Current All current consumption is performed when the field IBCTL in the ADC Analog Control Register (ADC_ACR) is set to 01. IBCTL controls the ADC biasing current, with the nominal setting IBCTL = 01. IBCTL = 00 is the required value for a sampling frequency below 500 kHz, and IBCTL = 01 for a sampling frequency between 500 kHz and 1 MHz. Table 44-39. 1172 ADC Bias Current Adjustment IBCTL = 00 IBCTL = 01 IBCTL = 10 IBCTL = 11 Typ-22% Typ Reserved Reserved SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.8.2 External Reference Voltage VADVREF is an external reference voltage applied on the pin ADVREF. The quality of the reference voltage VADVREF is critical to the performance of the ADC. A DC variation of the reference voltage VADVREF is converted to a gain error by the ADC. The noise generated by VADVREF is converted by the ADC to count noise. Table 44-40. ADVREF Electrical Characteristics Symbol Parameter VADVREF ADVREF Voltage Range Conditions Min Typ Max Full operational 2.4 - 3.6 2 - 2.4 V (1) Gain = 0.5, DIFF(3) mode (4) Input Voltage Noise(2) Vn Gain = 1, SE (4) Gain = 2, SE - - 1100 (3) - - 550 (3) - - 274 - - 137 6 8 10 k Min Typ Max Unit and DIFF Vrms and DIFF Gain = 4, SE(4) mode ADVREF Input DC Impedance RADVREF Notes: 1. 2. 3. 4. 5. Unit ADC reference resistor bridge (5) See Section "Low Voltage Supply". Over a bandwidth from 20 Hz to 20 MHz. DIFF is Differential mode. SE is Single-ended mode. When the ADC is in Sleep mode, the ADVREF impedance has a minimum of 10 M. 44.8.3 ADC Timings Table 44-41. ADC Timing Characteristics Symbol Parameter Conditions fADC Clock Frequency 1 20 22 MHz tCP_ADC Clock Period 45 50 1000 ns fS Sampling Frequency 0.05 1 1.1 MHz tSTART ADC Startup time Sleep mode to Normal mode 20 30 40 Fast Wake-up mode to Normal mode 4 8 12 tTRACKTIM Tracking Time Refer to notes 1 and 2. 15(1) - -(2) tCP_ADC tCONV Conversion Time (3) Number of ADC clock pulses to perform a conversion. - 20 - tCP_ADC - 306 - tCP_ADC s TRACKTIM < 15 tCAL Notes: Calibration time Calibration time given for one channel and one gain/one offset. 1. If ADC_MR.TRACKTIM is programmed with a value < 15, then the min. value is applied by default. 2. Refer to Figure 44-21 "Simplified Acquisition Path" for the max. tracking time computation. 3. Sampling frequency fs=1/tCONV in FREERUN mode. Oherwise, fs is defined by the trigger timing. If TRACKTIM >14: tCONV = tHOLD +(TRACKTIM+1) x tCP_ADC with hold time tHOLD=5 tCP_ADC. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1173 44.8.4 ADC Transfer Function The first operation of the ADC is a sampling function relative to a common mode voltage. The common mode voltage (VCM) is equal to VADVREF/2 when the bits OFFx = 1, in Differential and in Single-ended mode. When the bits OFFx = 0, sampling is done versus VADVREF/4 for gain = 2, and VADVREF/8 for gain = 4, in Single-ended mode only. The code in ADC_CDRx is a 12-bit positive integer. 44.8.4.1 Differential Mode A differential input voltage VI = VI+ - VI- can be applied between two selected differential pins, e.g., AD0 and AD1. The ideal code Ci is calculated by using the following formula and rounding the result to the nearest positive integer. 4096 Ci = ----------------------- x V I x Gain + 2047 V ADVREF Table 44-42 is a computation example for the above formula, where VADVREF = 3V. Table 44-42. 44.8.4.2 Input Voltage Values in Differential Mode Ci Gain = 0.5 Gain = 1 Gain = 2 0 -3 -1.5 -0.75 2047 0 0 0 4095 3 1.5 0.75 Single-ended Mode A single input voltage VI can be applied to selected pins, e.g., AD0 or AD1. The ideal code Ci is calculated by using the following formula and rounding the result to the nearest positive integer. The single-ended ideal code conversion formula for OFFx = 1 is: V ADVREF 4096 Ci = ----------------------- x V I - ----------------------- x Gain + 2047 V ADVREF 2 Table 44-43 is a computation example for the above formula, where VADVREF = 3V. Table 44-43. Input Voltage Values in Single-ended Mode, OFFx = 1 Ci Gain = 1 Gain = 2 Gain = 4 0 0 0.75 1.125 2047 1.5 1.5 1.5 4095 3 2.25 1.875 The single-ended ideal code conversion formula for OFFx = 0 is: 4096 Ci = V I x Gain x ----------------------- - 1 V ADVREF 1174 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 44-44 is a computation example for the above formula, where VADVREF = 3V. Table 44-44. 44.8.4.3 Input Voltage Values in Single-ended Mode, OFFx = 0 Ci Gain = 1 Gain = 2 Gain = 4 0 0 0 0 2047 1.5 0.75 0.375 4095 3 1.5 0.75 Example of LSB Computation The LSB is relative to the analog scale VADVREF. The term LSB expresses the quantization step in volts, also used for one ADC code variation. Single-ended (SE) (ex: VADVREF = 3.0V) Gain = 1, LSB = (3.0V / 4096) = 732 V Gain = 2, LSB = (1.5V / 4096) = 366 V Gain = 4, LSB = (750 mV / 4096) = 183 V Differential (DIFF) (ex: VADVREF = 3.0V) Gain = 0.5, LSB = (6.0V / 4096) = 1465 V Gain = 1, LSB = (3.0V / 4096) = 732 V Gain = 2, LSB = (1.5V / 4096) = 366 V 44.8.5 ADC Electrical Characteristics The gain error depends on the gain value and the OFFx bit. The data are given with and without autocorrection at TA 27C. The data include the ADC performances as the PGA and ADC core cannot be separated. The temperature and voltage dependency are given as separate parameters. Table 44-45. Voltage and Temperature Dependencies Symbol Parameter Conditions Min Typ Max Unit G Gain Temperature dependency -40C to 105C - - 5 ppm/C GV Gain Supply dependency VDDIN - - 0.025 %/V O Offset Temperature dependency -40C to 105C - - 5 ppm/C OV Offset Supply dependency VDDIN - - 0.025 %/V 44.8.5.1 Gain and Offset Errors For: a given gain error: EG (%) a given ideal code (Ci) a given offset error: EO (LSB) the actual code (Ca) is calculated using the following formula: EG Ca = 1 + --------- x ( Ci - 2047 ) + 2047 + E O 100 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1175 Differential Mode In differential mode, the offset is defined when the differential input voltage is zero. Figure 44-18. Gain and Offset Errors in Differential Mode ADC codes 4095 FSe+ EO = Offset error 2047 FSe0 VI Differential ADVREF/2 0 -ADVREF/2 where: FSe = (FSe+) - (FSe-) is for full-scale error, unit is LSB code Offset error EO is the offset error measured for VI = 0V Gain error EG = 100 x FSe / 4096, unit in % The error values in Table 44-46 and Table 44-47 include the sample and hold error as well as the PGA gain error. Table 44-46. Differential Gain Error EG Gain Mode 0.5 Auto Correction 2 No Yes No Yes No Yes Average Gain Error (%) -0.107 0.005 0.444 0.112 0.713 0.005 Standard Deviation (%) 0.410 0.210 0.405 0.229 0.400 0.317 Gain Min Value (%) -1.338 -0.625 -0.771 -0.576 -0.488 -0.947 Gain Max Value (%) 1.123 0.635 1.660 0.801 1.914 0.957 Table 44-47. 1176 1 Differential Output Offset Error EO Gain 0.5 1 2 Average Offset Error (LSB) -1.2 -1.2 -0.6 Standard Deviation (LSB) 0.3 0.4 0.4 Offset Min value (LSB) -2.1 -2.4 -1.8 Offset Max value (LSB) -0.3 0 0.6 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Single-ended Mode Figure 44-19 illustrates the ADC output code relative to an input voltage VI between 0V (Ground) and VADVREF. The ADC is configured in Single-ended mode by connecting internally the negative differential input to VADVREF/2. As the ADC continues to work internally in Differential mode, the offset is measured at VADVREF/2. Figure 44-19. Gain and Offset Errors in Single-ended Mode ADC codes 4095 FSe+ EO = Offset error 2047 FSeVI Single-ended 0 0 ADVREF ADVREF/2 where: FSe = (FSe+) - (FSe-) is for full-scale error, unit is LSB code Offset error EO is the offset error measured for VI = 0V Gain error EG = 100 x FSe / 4096, unit in % The error values in Table 44-48 and Table 44-49 include the sample and hold error as well as the PGA gain error. Table 44-48. Single-ended Gain Error Offset Mode OFFx = 0 OFFx = 0 OFFx = 1 OFFx = 0 OFFx = 1 1 2 2 4 4 Gain Mode No Yes No Yes No Yes No Yes No Yes Average Gain Error (%) 0.449 0.078 0.771 -0.010 0.781 0.117 1.069 -0.029 1.064 0.151 Standard Deviation (%) 0.420 0.200 0.430 0.313 0.425 0.327 0.420 0.415 0.415 0.371 Min Value (%) -0.811 -0.522 -0.518 -0.947 -0.493 -0.864 -0.190 -1.274 -0.181 -0.962 Max Value (%) 1.709 0.679 2.061 0.928 2.056 1.099 2.329 1.216 2.310 1.265 AutoCorrection Table 44-49. Single-ended Output Offset Error Offset Mode OFFx = 0 OFFx = 0 OFFx = 1 OFFx = 0 OFFx = 1 1 2 2 4 4 Average Offset Error (LSB) -5.7 -7.7 -10.3 -7.3 -18.7 Standard Deviation (LSB) 1.8 3.9 3.4 6 7 Min Value (LSB) -11.1 -19.4 -20.5 -25.3 -39.7 Max Value (LSB) -0.3 4 -0.1 10.7 2.3 Gain SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1177 44.8.5.2 ADC Electrical Performances Single-ended Static Performances Table 44-50. Single-ended Static Electrical Characteristics Symbol Parameter INL DNL Conditions Min Typ Max Unit ADC Integral Non-linearity -2 1 2 LSB ADC Differential Non-linearity -1 0.5 1 LSB Min Typ Max Unit 56 64 72 dB 66 74 84 dB 55 62 71 dB 9 10.5 12 bits Min Typ Max Unit Single-ended Dynamic Performances Table 44-51. Single-ended Dynamic Electrical Characteristics Symbol Parameter Conditions SNR Signal to Noise Ratio THD Total Harmonic Distortion SINAD Signal to Noise and Distortion ENOB Effective Number of Bits ADC Clock (fADC) = 20 MHz, fS = 1 MHz, fIN = 127 kHz, Frequency band = [1 kHz-500 kHz] Nyquist conditions fulfilled Differential Static Performances Table 44-52. Differential Static Electrical Characteristics Symbol Parameter Conditions INL Integral Non-linearity -2 1 2 LSB DNL Differential Non-linearity -1 0.5 1 LSB Min Typ Max Unit 60 70 74 dB 72 80 84 dB 60 68 73 dB 9.5 11 12 bits Differential Dynamic Performances Table 44-53. 1178 Differential Dynamic Electrical Characteristics Symbol Parameter Conditions SNR Signal to Noise Ratio THD Total Harmonic Distortion SINAD Signal to Noise and Distortion ENOB Effective Number of Bits ADC Clock (fADC) = 20 MHz, fS = 1 MHz, fIN = 127 kHz, Frequency band = [1 kHz-500 kHz] Nyquist conditions fulfilled SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 10-bit ADC Mode In 10-bit mode, the ADC produces 12-bit output but the output data in the register ADC_CDRx is shifted two bits to the right, removing the two LSBs of the 12-bit ADC. The gain and offset have the same values as for 12-bit mode, with digital full-scale output code range reduced to 1024 (vs 4096). The INL and DNL have the same values as for 12-bit mode. The dynamic performances are the 12-bit mode values, reduced by 12 dB. Low Voltage Supply The ADC performs in 10-bit mode or in 12-bit mode. Working at low voltage (VDDIN or/and VADVREF) between 2 and 2.4V is subject to the following restrictions: The field IBCTL must be 00 to reduce the biasing of the ADC under low voltage. See Section 44.8.1.1 "ADC Bias Current". In 10-bit mode, the ADC clock should not exceed 5 MHz (max signal bandwidth is 250 kHz). In 12-bit mode, the ADC clock should not exceed 2 MHz (max signal bandwidth is 100 kHz). 44.8.5.3 ADC Channel Input Impedance Figure 44-20. Input Channel Model Single-ended model Differential model Zi RON RON Ci Zi Ci GND RON where: Zi is input impedance in single-ended or differential mode Ci = 1 to 8 pF 20% depending on the gain value and mode (SE or DIFF); temperature dependency is negligible RON is typical 2 k and 8 k max (worst case process and high temperature) RON is negligible regarding the value of Zi The following formula is used to calculate input impedance: 1 Z i = ---------------fS x Ci where: fS is the sampling frequency of the ADC channel Typ values are used to compute ADC input impedance Zi SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1179 Table 44-54. Input Capacitance Values Gain Selection Single-ended Differential 0.5 - 2 pF 1 2 pF 4 pF 2 2 pF 8 pF 4 4 pF - Table 44-55. Zi Input Impedance fS (MHz) 1 0.5 0.25 0.125 0.0625 0.03125 0.015625 0.007813 8 16 32 64 4 8 16 32 2 4 8 16 Ci = 2 pF Zi (M) 0.5 1 2 4 Ci = 4 pF Zi (M) 0.25 0.5 1 2 Ci = 8 pF Zi (M) 0.125 0.25 0.5 1 Track and Hold Time versus Source Output Impedance Figure 44-21 shows a simplified acquisition path. Figure 44-21. Simplified Acquisition Path ADC Input Mux. Sample & Hold 12-bit ADC ZSOURCE RON Ci In 12-bit mode, during the tracking phase, the ADC needs to track the input signal during the tracking time shown below: tTRACK = 0.054 x ZSOURCE + 205 with tTRACK expressed in ns and ZSOURCE expressed in . The ADC already includes a tracking time of 15 tCP_ADC. Two cases must be considered: 1180 If the calculated tracking time (tTRACK) is lower than 15 tCP_ADC, then ADC_MR.TRACKTIM can be set to 0. If the calculated tracking time (tTRACK) is higher than 15 tCP_ADC, then ADC_MR.TRACKTIM must be set to the correct value. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.9 12-bit DAC Characteristics Table 44-56. Analog Power Supply Characteristics Symbol Parameter VDDIN Analog Supply Conditions Current Consumption IVDDIN Table 44-57. Min Typ Max Unit 2.4 3.0 3.6 V 3 A Sleep Mode (Clock OFF) - Fast Wake Up (Standby Mode, clock ON) - 2 3 mA Normal Mode with 1 output ON (DACC_ACR.IBCTLDACCORE = 01, DACC_ACR.IBCTLCHx = 10) - 4.3 5.6 mA Normal Mode with 2 outputs ON (DACC_ACR.IBCTLDACCORE = 01, DACC_ACR.IBCTLCHx = 10) - 5 6.5 mA Channel Conversion Time and DAC Clock Symbol Parameter fDAC Conditions Min Typ Max Unit Clock Frequency 1 - 50 MHz tCP_DAC Clock Period - - 20 ns tREFRESH Refresh Time 8-bit Accuracy 24 - - us From Sleep Mode to Normal Mode: - Voltage reference OFF - DAC core OFF 20 30 40 Startup Time tSTART s From Fast Wake Up to Normal Mode: - Voltage reference ON - DAC core OFF Conversion Time tCONV 2.5 3.75 5 - - 25 tCP_DAC External voltage reference for DAC is VADVREF. See the ADC voltage reference characteristics in Table 44-40 on page 1173. Table 44-58. Symbol Static Performance Characteristics Parameter Conditions Resolution INL DNL Integral Non-linearity Differential Non-linearity DAC Clock (fDAC) = 5 MHz, fS = 200 kHz, ADC_ACR.IBCTL = 01 Min Typ Max Unit - - 12 - bit 2.4V < VDDIN < 2.7V -6 - +6 2.7V < VDDIN < 3.6V -2 1 +2 -2.5 1 +2.5 LSB 2.4V < VDDIN < 2.7V LSB 2.7V < VDDIN < 3.6V EO Offset Error - -32 8 32 LSB EG Gain Error - -32 2 32 LSB SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1181 Table 44-59. Dynamic Performance Characteristics Symbol Parameter SNR Signal to Noise Ratio THD Conditions Total Harmonic Distortion SINAD Signal to Noise and Distortion ENOB DAC Clock (fDAC) = 50 MHz, fS = 2 MHz, fIN = 241 kHz, ADC_ACR.IBCTL = 01, FFT using 1024 points or more, Frequency band = [10 kHz-1 MHz] Nyquist conditions fulfilled Effective Number of Bits Table 44-60. Min Typ Max 2.4V < VDDIN < 2.7V 50 62 70 2.7V < VDDIN < 3.6V 62 70 74 2.4V < VDDIN < 2.7V -78 -64 -60 2.7V < VDDIN < 3.6V -80 -74 -72 2.4V < VDDIN < 2.7V 50 60 70 2.7V < VDDIN < 3.6V 62 68 73 2.4V < VDDIN < 2.7V 8 10 12 2.7V < VDDIN < 3.6V 10 11 12 Unit dB dB dB bit Analog Outputs Symbol Parameter VOR Voltage Range Conditions Min Typ Max Unit (1/6) x VADVREF - (5/6) x VADVREF V - 2.7 - V/s - mA Channel output current versus slew rate (IBCTL for DAC0 or DAC1, noted IBCTLCHx) RLOAD = 10 k, 0 pF < CLOAD< 50 pF SR Slew Rate IBCTLCHx = 00 5.3 IBCTLCHx = 01 IBCTLCHx = 10 8 IBCTLCHx = 11 10.7 No resistive load 0.23 IBCTLCHx = 00 Output Channel Current Consumption tsa Settling Time RLOAD CLOAD 1182 IBCTLCHx = 01 - 0.45 IBCTLCHx = 10 0.67 IBCTLCHx = 11 0.89 RLOAD = 10 k, 0 pF < CLOAD< 50 pF - - 0.5 s Output load resistor 10 - - k Output load capacitor - 30 50 pF SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.10 Analog Comparator Characteristics Table 44-61. Analog Comparator Characteristics Symbol Parameter Conditions Min Typ Max Unit VR Voltage Range Analog comparator is supplied by VDDIN 1.62 3.3 3.6 V VIR Input Voltage Range GND + 0.2 - VDDIN - 0.2 V VIO Input Offset Voltage - - 20 mV Current Consumption (VDDIN) Low-Power Option (ACC_ACR.ISEL = 0) - - 25 IVDDIN High-Speed Option (ACC_ACR.ISEL = 1) - - 170 ACC_ACR.HYST = 0x01 or 0x10 - 15 50 Vhys Hysteresis Voltage ACC_ACR.HYST = 0x11 - 30 90 Overdrive > 100 mV; Low-power option - - 1 tsa Settling Time Overdrive > 100 mV; High-speed option - - 0.1 A mV s 44.11 Temperature Sensor The temperature sensor is connected to channel 15 of the ADC. The temperature sensor provides an output voltage (VO_TS) that is proportional to absolute temperature (PTAT). VO_TS linearly varies with a temperature slope dVO_TS/dT = 4.7 mV/C. VO_TS equals 1.44 V at TA 27C, with a 60 mV accuracy. The VO_TS slope versus temperature dVO_TS/dT = 4.7 mV/C only shows a 7% slight variation over process, mismatch and supply voltage. The user needs to calibrate it (offset calibration) at ambient temperature in order to get rid of the VO_TS spread at ambient temperature (15%). Table 44-62. Symbol VO_TS Temperature Sensor Characteristics Parameter Conditions Output Voltage TA = 27C (1) (1) Min Typ Max Unit 1.44 - V -60 - 60 mV VO_TS(accuracy) Output Voltage Accuracy TA = 27C dVO_TS/dT Temperature Sensitivity (Slope Voltage vs Temperature) (1) - 4.7 - mV/C Slope Accuracy Over temperature range -40 to 105 C (1) -7 - 7 % After offset calibration over temperature range -40 to 105 C -6 - 6 C After offset calibration over temperature range 0 to 80 C -5 - 5 C (2) Temperature Accuracy tSTART Startup Time After ADC_ACR.TSON = 1 (1) IVDDCORE Current Consumption (1) Note: - 5 10 s 50 70 80 A 1. The value of TS only (the value does not take into account the ADC offset/gain/errors) 2. The temperature accuracy takes into account the ADC offset error and gain error in single-ended mode with Gain = 1. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1183 44.12 AC Characteristics 44.12.1 Master Clock Characteristics Table 44-63. Symbol Master Clock Waveform Parameters Parameter 1/(tCPMCK) Master Clock Frequency Min Max VDDCORE @ 1.20V Conditions - 120 VDDCORE @ 1.08V - 100 Unit MHz 44.12.2 I/O Characteristics Criteria used to define the maximum frequency of the I/Os: Output duty cycle (40%-60%) Minimum output swing: 100 mV to VDDIO - 100 mV Minimum output swing: 100 mV to VDDIO - 100 mV Addition of rising and falling time inferior to 75% of the period Table 44-64. I/O Characteristics Symbol Parameter FreqMax1 Pin Group 1(1) Maximum Output Frequency PulseminH1 Pin Group 1(1) High Level Pulse Width PulseminL1 Pin Group 1(1) Low Level Pulse Width FreqMax2 Pin Group 2(2) Maximum Output Frequency PulseminH2 Pin Group 2(2) High Level Pulse Width PulseminL2 Pin Group 2(2) Low Level Pulse Width FreqMax3 Pin Group3(3) Maximum Output Frequency PulseminH3 Pin Group 3(3) High Level Pulse Width PulseminL3 Pin Group 3(3) Low Level Pulse Width FreqMax4 Pin Group 4(4) Maximum Output Frequency PulseminH4 Pin Group 4(4) High Level Pulse Width PulseminL4 Pin Group 4(4) Low Level Pulse Width FreqMax5 Pin Group 5(5) Maximum Output Frequency tsk(io) Notes: 1184 Maximum I/O skew for all I/Os except PB0 Maximum I/O skew for PB0 1. Pin Group 1 = PA14, PA29 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Conditions Min Max 10 pF - 70 30 pF - 45 10 pF - - 30 pF 11 - 10 pF 7.2 - 30 pF 11 - 10 pF - 46 25 pF - 23 10 pF 11 - 25 pF 21.8 - 10 pF 11 - 25 pF 21.8 - 10 pF - 70 - 35 25 pF VDDIO = 1.62V 10 pF 7.2 - 25 pF 14.2 - 10 pF 7.2 - 25 pF 14.2 - 10 pF - 58 25 pF - 29 10 pF 8.6 - 25 pF 17.2 - 10 pF 8.6 - 25 pF 17.2 - 25 pF - 25 - 800 - 1200 30 pF Unit MHz ns ns MHz ns ns MHz ns ns MHz ns ns MHz ps 2. 3. 4. 5. Pin Group 2 = PA[4-11], PA[15-25], PA[30-31], PB[0-9], PB[12-14], PC[0-31] Pin Group 3 = PA[12-13], PA[26-28], PA[30-31] Pin Group 4 = PA[0-3] Pin Group 5 = PB[10-11] SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1185 44.12.3 SPI Characteristics Figure 44-22. SPI Master Mode with (CPOL = NCPHA = 0) or (CPOL = NCPHA = 1) SPCK SPI1 SPI0 MISO SPI2 MOSI Figure 44-23. SPI Master Mode with (CPOL = 0 and NCPHA = 1) or (CPOL = 1 and NCPHA = 0) SPCK SPI4 SPI3 MISO SPI5 MOSI Figure 44-24. SPI Slave Mode with (CPOL = 0 and NCPHA = 1) or (CPOL = 1 and NCPHA = 0) NPCSS SPI13 SPI12 SPCK SPI6 MISO SPI7 MOSI 1186 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SPI8 Figure 44-25. SPI Slave Mode with (CPOL = NCPHA = 0) or (CPOL = NCPHA = 1) NPCS0 SPI15 SPI14 SPCK SPI9 MISO SPI10 SPI11 MOSI 44.12.3.1 Maximum SPI Frequency The following formulas give maximum SPI frequency in master read and write modes and in slave read and write modes. Master Write Mode The SPI only sends data to a slave device such as an LCD, for example. The limit is given by SPI2 (or SPI5) timing. Since it gives a maximum frequency above the maximum pad speed (see Section 44.12.2 "I/O Characteristics"), the maximum SPI frequency is defined by the pin FreqMax value. Master Read Mode 1 f SPCK Max = -----------------------------------------------------SPI 0 ( orSPI 3 ) + t valid tvalid is the slave time response to output data after detecting an SPCK edge. For a non-volatile memory with tvalid (or tV) = 12 ns Max, fSPCKMax = 35.5 MHz @ VDDIO = 3.3V. Slave Read Mode In slave mode, SPCK is the input clock for the SPI. The maximum SPCK frequency is given by setup and hold timings SPI7/SPI8 (or SPI10/SPI11). Since this gives a frequency well above the pad limit, the limit in slave read mode is given by SPCK pad. Slave Write Mode 1 f SPCK Max = -----------------------------------------------------------------------------2x ( S PI 6max ( orSPI 9max ) + t su ) For 3.3V I/O domain and SPI6, fSPCKMax = 25 MHz. tsu is the setup time from the master before sampling data. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1187 44.12.3.2 SPI Timings SPI timings are given for the following domains: 1.8V domain: VDDIO from 1.65 to 1.95 V, maximum external capacitor = 20 pF 3.3V domain: VDDIO from 2.85 to 3.6 V, maximum external capacitor = 40 pF Table 44-65. 1188 SPI Timings Symbol Parameter SPI0 MISO Setup Time before SPCK Rises (Master) SPI1 MISO Hold Time after SPCK Rises (Master) SPI2 SPCK Rising to MOSI Delay (Master) SPI3 MISO Setup Time before SPCK Falls (Master) SPI4 MISO Hold Time after SPCK Falls (Master) SPI5 SPCK Falling to MOSI Delay (Master) SPI6 SPCK Falling to MISO Delay (Slave) SPI7 MOSI Setup Time before SPCK Rises (Slave) SPI8 MOSI Hold Time after SPCK Rises (Slave) SPI9 SPCK Rising to MISO Delay (Slave) SPI10 MOSI Setup Time before SPCK Falls (Slave) SPI11 MOSI Hold Time after SPCK Falls (Slave) SPI12 NPCS Setup to SPCK Rising (Slave) SPI13 NPCS Hold after SPCK Falling (Slave) SPI14 NPCS Setup to SPCK Falling (Slave) SPI15 NPCS Hold after SPCK Falling (Slave) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Conditions Min Max Unit 3.3V domain 11.3 - ns 1.8V domain 13.3 - ns 3.3V domain 0 - ns 1.8V domain 0 - ns 3.3V domain -2.0 1.9 ns 1.8V domain -1.9 1.0 ns 3.3V domain 16.2 - ns 1.8V domain 21.6 - ns 3.3V domain 0 - ns 1.8V domain 0 - ns 3.3V domain -7 -3.6 ns 1.8V domain -6.7 -4.2 ns 3.3V domain 3.4 11.1 ns 1.8V domain 4.1 13.1 ns 3.3V domain 0 - ns 1.8V domain 0 - ns 3.3V domain 1.3 - ns 1.8V domain 0.9 - ns 3.3V domain 3.6 11.5 ns 1.8V domain 4.1 12.9 ns 3.3V domain 0 - ns 1.8V domain 0 - ns 3.3V domain 0.8 - ns 1.8V domain 0.9 - ns 3.3V domain 3.3 - ns 1.8V domain 3.5 - ns 3.3V domain 0 - ns 1.8V domain 0 - ns 3.3V domain 4 - ns 1.8V domain 3.6 - ns 3.3V domain 0 - ns 1.8V domain 0 - ns Note that in SPI Master Mode the SAM4S does not sample the data (MISO) on the opposite edge where data clocks out (MOSI) but the same edge is used. This is shown in Figure 44-22 and Figure 44-23. 44.12.4 HSMCI Timings The High-speed MultiMedia Card Interface (HSMCI) supports the MultiMedia Card (MMC) Specification V4.3, the SD Memory Card Specification V2.0, the SDIO V2.0 specification and CE-ATA V1.1. 44.12.5 SSC Timings SSC timings are given for the following domains: 1.8V domain: VDDIO from 1.65 to 1.95 V, maximum external capacitor = 20 pF 3.3V domain: VDDIO from 2.85 to 3.6 V, maximum external capacitor = 30 pF Figure 44-26. SSC Transmitter, TK and TF as Output TK (CKI =0) TK (CKI =1) SSC0 TF/TD Figure 44-27. SSC Transmitter, TK as Input and TF as Output TK (CKI =0) TK (CKI =1) SSC1 TF/TD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1189 Figure 44-28. SSC Transmitter, TK as Output and TF as Input TK (CKI=0) TK (CKI=1) SSC2 SSC3 TF SSC4 TD Figure 44-29. SSC Transmitter, TK and TF as Input TK (CKI=1) TK (CKI=0) SSC5 TF SSC7 TD Figure 44-30. SSC Receiver RK and RF as Input RK (CKI=0) RK (CKI=1) SSC8 RF/RD 1190 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SSC9 SSC6 Figure 44-31. SSC Receiver, RK as Input and RF as Output RK (CKI=1) RK (CKI=0) SSC8 SSC9 RD SSC10 RF Figure 44-32. SSC Receiver, RK and RF as Output RK (CKI=1) RK (CKI=0) SSC11 SSC12 RD SSC13 RF Figure 44-33. SSC Receiver, RK as Output and RF as Input RK (CKI=0) RK (CKI=1) SSC11 SSC12 RF/RD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1191 Table 44-66. Symbol SSC Timings Parameter Conditions Min Max Unit Transmitter SSC0 TK Edge to TF/TD (TK Output, TF Output) 1.8V domain -3 5.4 3.3V domain -2.6 5.0 SSC1 TK Edge to TF/TD (TK Input, TF Output) 1.8V domain 4.5 19.6 3.3V domain 3.8 13.3 SSC2 TF Setup Time before TK Edge (TK Output) 1.8V domain 18.9 3.3V domain 12.0 SSC3 TF Hold Time after TK Edge (TK Output) 1.8V domain ns 0 - ns 2.6 5.4 2.6 + (2 x tCPMCK)(1) 5.4 + (2 x tCPMCK)(1) 2.3 5.0 2.3 + (2 x tCPMCK)(1) 5.0 + (2 x tCPMCK)(1) 0 - ns tCPMCK - ns 4.5 16.3 4.5 + (3 x tCPMCK)(1) 16.3 + (3 x tCPMCK)(1) 3.8 13.3 3.8 + (3 x tCPMCK)(1) 13.3 + (3 x tCPMCK)(1) 0 - ns tCPMCK - ns 1.8V domain 4.7 16.1 3.3V domain 4 12.8 3.3V domain - STTDLY = 0 START = 4, 5 or 7 TK Edge to TF/TD (TK Output, TF Input) - 3.3V domain STTDLY = 0 START = 4, 5 or 7 SSC5 TF Setup Time before TK Edge (TK Input) 1.8V domain SSC6 TF Hold Time after TK edge (TK Input) 1.8V domain 3.3V domain 3.3V domain - 1.8V domain SSC7 ns - 1.8V domain SSC4 ns STTDLY = 0 START = 4, 5 or 7 TK Edge to TF/TD (TK Input, TF Input) - 3.3V domain STTDLY = 0 START = 4, 5 or 7 ns ns Receiver SSC8 RF/RD Setup Time before RK Edge (RK Input) 1.8V domain SSC9 RF/RD Hold Time after RK Edge (RK Input) 1.8V domain SSC10 RK Edge to RF (RK Input) SSC11 RF/RD Setup Time before RK Edge (RK Output) 1.8V domain 15.8 - tCPMCK 3.3V domain 12.5 - tCPMCK SSC12 RF/RD Hold Time after RK Edge (RK Output) 1.8V domain tCPMCK - 4.3 3.3V domain tCPMCK - 3.6 SSC13 RK Edge to RF (RK Output) 1192 3.3V domain 3.3V domain - ns - ns 1.8V domain -3 4.3 3.3V domain -2.6 3.8 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ns ns Note: 1. For output signals (TF, TD, RF), Min and Max access times are defined. The Min access time is the time between the TK (or RK) edge and the signal change. The Max access time is the time between the TK edge and the signal stabilization. Figure 44-34 illustrates Min and Max accesses for SSC0. This also applies for SSC1, SSC4, and SSC7, SSC10 and SSC13. Figure 44-34. Min and Max Access Time of Output Signals TK (CKI = 1) TK (CKI = 0) SSC0min SSC0max TF/TD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1193 44.12.6 SMC Timings SMC timings are given in the following domains: 1.8V domain: VDDIO from 1.65 to 1.95 V, maximum external capacitor = 30 pF 3.3V domain: VDDIO from 2.85 to 3.6 V, maximum external capacitor = 50 pF Timings are given assuming a capacitance load on data, control and address pads. In the following tables tCPMCK is MCK period. 44.12.6.1 Read Timings Table 44-67. SMC Read Signals - NRD Controlled (READ_MODE = 1) Parameter Symbol Min VDDIO Supply 1.8V Domain Max 3.3V Domain 1.8V Domain 3.3V Domain Unit NO HOLD Settings (NRD_HOLD = 0) SMC1 Data Setup before NRD High SMC2 Data Hold after NRD High 24.5 21.3 - - ns 0 0 - - ns 19.5 14.0 - - ns 0 0 - - ns - - ns - - ns - - ns HOLD Settings (NRD_HOLD 0) SMC3 Data Setup before NRD High SMC4 Data Hold after NRD High HOLD or NO HOLD Settings (NRD_HOLD 0, NRD_HOLD = 0) SMC5 A0-A22 Valid before NRD High SMC6 NCS Low before NRD High SMC7 NRD Pulse Width Table 44-68. (NRD_SETUP + (NRD_SETUP + NRD_PULSE) x tCPMCK - 6.5 NRD_PULSE) x tCPMCK - 6.3 (NRD_SETUP + NRD_PULSE NCS_RD_SETUP) x tCPMCK - 4.5 NRD_PULSE x tCPMCK - 7.2 NRD_PULSE x tCPMCK - 6.2 SMC Read Signals - NCS Controlled (READ_MODE = 0) Parameter Symbol (NRD_SETUP + NRD_PULSE NCS_RD_SETUP) x tCPMCK - 5.1 Min VDDIO Supply 1.8V Domain Max 3.3V Domain 1.8V Domain 3.3V Domain Unit NO HOLD Settings (NCS_RD_HOLD = 0) SMC8 Data Setup before NCS High SMC9 Data Hold after NCS High 20.7 18.4 - - ns 0 0 - - ns HOLD Settings (NCS_RD_HOLD 0) SMC10 Data Setup before NCS High SMC11 Data Hold after NCS High 1194 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 16.8 14.5 - - ns 0 0 - - ns Table 44-68. SMC Read Signals - NCS Controlled (READ_MODE = 0) (Continued) Parameter Symbol Min VDDIO Supply Max 1.8V Domain 3.3V Domain 1.8V Domain 3.3V Domain Unit HOLD or NO HOLD Settings (NCS_RD_HOLD 0, NCS_RD_HOLD = 0) SMC12 A0-A22 Valid before NCS High SMC13 NRD Low before NCS High SMC14 NCS Pulse Width 44.12.6.2 (NCS_RD_SETUP + NCS_RD_PULSE) x tCPMCK - 6.5 (NCS_RD_SETUP + NCS_RD_PULSE) x tCPMCK - 6.3 - - ns (NCS_RD_SETUP + NCS_RD_PULSE NRD_SETUP) x tCPMCK 5.6 (NCS_RD_SETUP + NCS_RD_PULSE NRD_SETUP) x tCPMCK - 5.4 - - ns NCS_RD_PULSE length x tCPMCK -7.7 NCS_RD_PULSE length x tCPMCK - 6.7 - - ns Write Timings Table 44-69. SMC Write Signals - NWE Controlled (WRITE_MODE = 1) Min Symbol Parameter 1.8V Domain Max 3.3V Domain 1.8V Domain 3.3V Domain Unit HOLD or NO HOLD Settings (NWE_HOLD 0, NWE_HOLD = 0) SMC15 Data Out Valid before NWE High NWE_PULSE x tCPMCK - 6.9 NWE_PULSE x tCPMCK - 3.3 - - ns SMC16 NWE Pulse Width NWE_PULSE x tCPMCK - 7.3 NWE_PULSE x tCPMCK - 6.3 - - ns SMC17 A0-A22 Valid before NWE Low NWE_SETUP x tCPMCK - 7.2 NWE_SETUP x tCPMCK - 7.0 - - ns SMC18 NCS Low before NWE High (NWE_SETUP (NWE_SETUP NCS_RD_SETUP + NCS_RD_SETUP + NWE_PULSE) x tCPMCK - 4.1 NWE_PULSE) x tCPMCK - 3.1 - - ns - - ns - - ns - - ns HOLD Settings (NWE_HOLD 0) SMC19 NWE High to Data OUT, NBS0/A0 NBS1, NBS2/A1, NBS3, A2-A25 change NWE_HOLD x tCPMCK - 12.2 SMC20 NWE High to NCS Inactive(1) (NWE_HOLD (NWE_HOLD NCS_WR_HOLD) x tCPMCK - NCS_WR_HOLD) x tCPMCK 8.6 5.0 NWE_HOLD x tCPMCK - 6.9 NO HOLD Settings (NWE_HOLD = 0) SMC21 Notes: NWE High to Data OUT, NBS0/A0 NBS1, NBS2/A1, NBS3, A2-A25, NCS change(1) 3.0 2.8 1. Hold length = total cycle duration - setup duration - pulse duration. "Hold length" is for "NCS_WR_HOLD length" or "NWE_HOLD length". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1195 Table 44-70. SMC Write Signals - NCS Controlled (WRITE_MODE = 0) Min Symbol Parameter Max 1.8V Domain 3.3V Domain 1.8V Domain 3.3V Domain Unit SMC22 Data Out Valid before NCS High NCS_WR_PULSE x tCPMCK - 6.3 NCS_WR_PULSE x tCPMCK - 6.2 - - ns SMC23 NCS Pulse Width NCS_WR_PULSE x tCPMCK - 7.7 NCS_WR_PULSE x tCPMCK - 6.7 - - ns SMC24 A0-A22 Valid before NCS Low NCS_WR_SETUP x tCPMCK - 6.5 NCS_WR_SETUP x tCPMCK - 6.3 - - ns SMC25 NWE Low before NCS High - - ns SMC26 NCS High to Data Out, A0-A25, Change SMC27 NCS High to NWE Inactive (NCS_WR_SETUP (NCS_WR_SETUP NWE_SETUP + NCS pulse) NWE_SETUP + NCS pulse) x tCPMCK - 5.1 x tCPMCK - 4.9 NCS_WR_HOLD x tCPMCK - 10.2 NCS_WR_HOLD x tCPMCK - 8.4 - - ns (NCS_WR_HOLD NWE_HOLD) x tCPMCK - 2.1 (NCS_WR_HOLD NWE_HOLD) x tCPMCK - 1.6 - - ns Figure 44-35. SMC Timings - NCS Controlled Read and Write SMC12 SMC12 SMC26 SMC24 A0-A23 SMC13 SMC13 NRD NCS SMC14 SMC14 SMC8 SMC9 SMC10 SMC23 SMC11 SMC22 SMC26 DATA SMC25 SMC27 NWE NCS Controlled READ with NO HOLD 1196 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 NCS Controlled READ with HOLD NCS Controlled WRITE Figure 44-36. SMC Timings - NRD Controlled Read and NWE Controlled Write SMC21 SMC5 SMC17 SMC5 SMC17 SMC19 A0-A23 SMC6 SMC21 SMC6 SMC18 SMC18 SMC20 NCS NRD SMC7 SMC7 SMC1 SMC2 SMC15 SMC21 SMC3 SMC4 SMC15 SMC19 DATA NWE SMC16 NRD Controlled READ with NO HOLD NWE Controlled WRITE with NO HOLD SMC16 NRD Controlled READ with HOLD NWE Controlled WRITE with HOLD SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1197 44.12.7 USART in SPI Mode Timings Timings are given in the following domain: 1.8V domain: VDDIO from 1.65 to 1.95 V, maximum external capacitor = 20 pF 3.3V domain: VDDIO from 2.85 to 3.6 V, maximum external capacitor = 40 pF Figure 44-37. USART SPI Master Mode * MOSI line is driven by the output pin TXD * MISO line drives the input pin RXD * SCK line is driven by the output pin SCK * NSS line is driven by the output pin RTS NSS SPI5 SPI3 CPOL = 1 SPI0 SCK CPOL = 0 SPI4 MISO SPI4 SPI1 SPI2 LSB MSB MOSI Figure 44-38. USART SPI Slave Mode: (Mode 1 or 2) * MOSI line drives the input pin RXD * MISO line is driven by the output pin TXD * SCK line drives the input pin SCK * NSS line drives the input pin CTS NSS SPI13 SPI12 SCK SPI6 MISO SPI7 MOSI 1198 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 SPI8 Figure 44-39. USART SPI Slave Mode: (Mode 0 or 3) NSS SPI14 SPI15 SCK SPI9 MISO SPI10 SPI11 MOSI SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1199 44.12.7.1 USART SPI TImings Table 44-71. Symbol USART SPI Timings Parameter Conditions Min Max Unit MCK/6 - ns - ns - ns - ns Master Mode SPI0 SCK Period SPI1 Input Data Setup Time SPI2 Input Data Hold Time SPI3 Chip Select Active to Serial Clock SPI4 Output Data Setup Time SPI5 Serial Clock to Chip Select Inactive 1.8V domain 3.3V domain 1.8V domain 0.5 x MCK + 0.8 3.3V domain 0.5 x MCK + 1.0 1.8V domain 1.5 x MCK + 0.3 3.3V domain 1.5 x MCK + 0.1 1.8V domain 1.5 x SPCK - 1.5 3.3V domain 1.5 x SPCK - 2.1 1.8V domain - 7.9 9.9 3.3V domain - 7.2 10.7 1.8V domain 1 x SPCK - 7.7 3.3V domain 1 x SPCK - 11.8 - ns ns Slave Mode 1200 SPI6 SCK Falling to MISO SPI7 MOSI Setup Time before SCK Rises SPI8 MOSI Hold Time after SCK Rises SPI9 SCK Rising to MISO SPI10 MOSI Setup Time before SCK Falls SPI11 MOSI Hold Time after SCK Falls SPI12 NPCS0 Setup to SCK Rising SPI13 NPCS0 Hold after SCK Falling SPI14 NPCS0 Setup to SCK Falling SPI15 NPCS0 Hold after SCK Rising SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1.8V domain 4.7 17.3 3.3V domain 4 15.2 1.8V domain 2 x MCK + 0.7 3.3V domain 2 x MCK 1.8V domain 0 3.3V domain 0.1 1.8V domain 4.7 20.1 3.3V domain 4.1 15.5 1.8V domain 2 x MCK + 0.7 3.3V domain 2 x MCK + 0.6 1.8V domain 0.2 3.3V domain 0.1 1.8V domain 2.5 x MCK + 0.5 3.3V domain 2.5 x MCK 1.8V domain 1.5 x MCK + 0.2 3.3V domain 1.5 x MCK 1.8V domain 2.5 x MCK + 0.5 3.3V domain 2.5 x MCK + 0.3 1.8V domain 1.5 x MCK 3.3V domain 1.5 x MCK ns - ns - ns ns - ns - ns - ns - ns - ns - ns 44.12.8 Two-wire Serial Interface Characteristics Table 44-72 describes the requirements for devices connected to the two-wire serial bus. For timing symbols refer to Figure 44-40. Table 44-72. Two-wire Serial Bus Requirements Symbol Parameter VIL Condition Min Max Unit Input Low-voltage -0.3 0.3 x VDDIO V VIH Input High-voltage 0.7 x VDDIO VCC + 0.3 V Vhys Hysteresis of Schmitt Trigger Inputs 0.150 - V VOL Output Low-voltage 3 mA sink current - 0.4 V (1)(2) 300 ns 20 + 0.1Cb(1)(2) 250 ns tr Rise Time for both TWD and TWCK tfo Output Fall Time from VIHmin to VILmax Ci(1) Capacitance for each I/O Pin - 10 pF fTWCK TWCK Clock Frequency 0 400 kHz Rp Value of Pull-up Resistor fTWCK 100 kHz (VDDIO - 0.4V) / 3mA 1000ns / Cb fTWCK > 100 kHz (VDDIO - 0.4V) / 3mA 300ns / Cb fTWCK 100 kHz (3) - s fTWCK > 100 kHz (3) - s fTWCK 100 kHz (4) - s fTWCK > 100 kHz (4) - s fTWCK 100 kHz tHIGH - s fTWCK > 100 kHz tHIGH - s fTWCK 100 kHz tHIGH - s fTWCK > 100 kHz tHIGH - tLOW Low Period of the TWCK Clock tHIGH High Period of the TWCK Clock th(start) Hold Time (repeated) START Condition tsu(start) Set-up Time for a Repeated START Condition th(data) Data Hold Time tsu(data) Data Setup Time tsu(stop) Setup Time for STOP Condition tBUF Bus Free Time between a STOP and START Condition Notes: 1. 2. 3. 4. 5. 20 + 0.1Cb 10 pF < Cb < 400 pF Figure 44-40 fTWCK 100 kHz fTWCK > 100 kHz s 0 3 x tCPMCK (5) 0 3 x tCPMCK (5) fTWCK 100 kHz tLOW - 3 x tCPMCK (5) fTWCK > 100 kHz tLOW - 3 x tCPMCK (5) s s - ns - ns fTWCK 100 kHz tHIGH - s fTWCK > 100 kHz tHIGH - s fTWCK 100 kHz tLOW - s fTWCK > 100 kHz tLOW - s Required only for fTWCK > 100 kHz Cb = capacitance of one bus line in pF. Per I2C Standard, Cb Max = 400 pF The TWCK low period is defined as follows: tLOW = ((CLDIV x 2CKDIV) + 4) x tMCK The TWCK high period is defined as follows: tHIGH = ((CHDIV x 2CKDIV) + 4) x tMCK tCPMCK = MCK bus period. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1201 Figure 44-40. Two-wire Serial Bus Timing tfo tHIGH tLOW tr tLOW TWCK tsu(start) th(start) TWD th(data) tsu(data) tsu(stop) tBUF 1202 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 44.12.9 Embedded Flash Characteristics The maximum operating frequency given in Table 44-73 is limited by the embedded Flash access time when the processor is fetching code out of it. The table provides the device maximum operating frequency defined by the value of the field FWS in the EEFC_FMR. This field defines the number of wait states required to access the embedded Flash memory. The embedded Flash is fully tested during production test. The Flash contents are not set to a known state prior to shipment. Therefore, the Flash contents should be erased prior to programming an application. Table 44-73. Embedded Flash Wait State at 105C Maximum Operating Frequency (MHz) VDDCORE 1.08V VDDCORE 1.2V FWS Read Operations VDDIO 1.62-3.6 V VDDIO 2.7-3.6 V VDDIO 1.62-3.6 V VDDIO 2.7-3.6 V 0 1 cycle 16 20 17 21 1 2 cycles 33 40 34 42 2 3 cycles 50 60 52 63 3 4 cycles 67 80 69 84 4 5 cycles 84 100 87 105 5 6 cycles 100 - 104 120 Table 44-74. AC Flash Characteristics Parameter Program Cycle Time Erase Pin Assertion Time Full Chip Erase Data Retention Page Program Time(2) Endurance Notes: Conditions(1) Min Typ Max Unit Erase Page Mode - 10 50 ms Erase Block Mode (by 4 Kbytes) - 50 200 ms Erase Sector Mode - 400 950 ms 220 - - ms 1 Mbyte - 9 18 512 Kbytes - 5.5 11 256 Kbytes - 3 6 128 Kbytes - 2 4 Not powered or powered - 20 - years 1 word changed in the page - - 75 s 2 words changed in the page - - 120 s 4 words changed in the page - - 210 s 16 words changed in the page - - 740 s 32 words changed in the page - - 1.45 ms Full page - - 3 ms - - - - Erase pin high Write/Erase cycles per page, block or sector @ 85C Write/Erase cycles per page, block or sector @ 50C 10k 50k s cycles 1. Only the read operation is characterized between -40 and 105 C. Other operations are characterized between -40 and 85 C. 2. All bits in the word(s) are set to 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1203 45. Mechanical Characteristics All packages of the SAM4S devices respect the recommendations of the NEMI User Group. 45.1 100-lead LQFP Mechanical Characteristics Figure 45-1. 100-lead LQFP Package Mechanical Drawing CONTROL DIMENSIONS ARE IN MILLIMETERS Note : 1. This drawing is for general information only. Refer to JEDEC Drawing MS-026 for additional information. Table 45-1. Device and LQFP Package Maximum Weight SAM4S Table 45-2. 800 Package Reference JEDEC Drawing Reference MS-026 JESD97 Classification e3 Table 45-3. LQFP Package Characteristics Moisture Sensitivity Level 1204 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 3 mg 45.2 100-ball TFBGA Mechanical Characteristics Figure 45-2. 100-ball TFBGA Package Drawing Table 45-4. TFBGA Package Reference - Soldering Information (Substrate Level) Ball Land Diameter 450 m Soldering Mask Opening 350 m Table 45-5. Device and 100-ball TFBGA Package Maximum Weight SAM4S 141 Table 45-6. 100-ball TFBGA Package Characteristics Moisture Sensitivity Level Table 45-7. mg 3 100-ball TFBGA Package Reference JEDEC Drawing Reference MO-275-DDAC-1 JESD97 Classification e8 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1205 45.3 100-ball VFBGA Mechanical Characteristics Figure 45-3. 100-ball VFBGA Package Drawing Table 45-8. VFBGA Package Dimensions Symbol Package: Common Dimensions (mm) VFBGA X E 7.000 0.100 Y D 7.000 0.100 X eE 0.650 Y eD 0.650 Total Thickness: A 1.000 max Mold Thickness: M 0.450 ref. Substrate Thickness: S 0.210 ref. Body Size: Ball Pitch: 1206 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 45-8. VFBGA Package Dimensions (Continued) Symbol Common Dimensions (mm) Ball Diameter: 0.300 Stand Off: A1 0.160 ~ 0.260 Ball Width: b 0.270 ~ 0.370 Package Edge Tolerance: aaa 0.100 Mold Flatness: bbb 0.100 Coplanarity: ddd 0.080 Ball Offset (Package): eee 0.150 Ball Offset (Ball): fff 0.080 Ball Count: n 100 X E1 5.850 Y D1 5.850 X I 0.575 Y J 0.575 Edge Ball Center to Center: Corner Ball Center to Package Edge: Table 45-9. VFBGA Package Reference - Soldering Information (Substrate Level) Ball Land Diameter 0.27 mm Soldering Mask Opening 275 m Table 45-10. Device and 100-ball VFBGA Package Maximum Weight SAM4S Table 45-11. 75 100-ball VFBGA Package Characteristics Moisture Sensitivity Level Table 45-12. mg 3 100-ball VFBGA Package Reference JEDEC Drawing Reference MO-275-BBE-1 JESD97 Classification e8 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1207 45.4 64-lead LQFP Mechanical Characteristics Figure 45-4. 64-lead LQFP Package Drawing Table 45-13. 64-lead LQFP Package Dimensions (in mm) Millimeter Symbol Min Nom Max Min Nom Max A - - 1.60 - - 0.063 A1 0.05 - 0.15 0.002 - 0.006 A2 1.35 1.40 1.45 0.053 0.055 0.057 D 12.00 BSC 0.472 BSC D1 10.00 BSC 0.383 BSC E 12.00 BSC 0.472 BSC E1 10.00 BSC 0.383 BSC R2 1208 Inch 0.08 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 - 0.20 0.003 - 0.008 Table 45-13. 64-lead LQFP Package Dimensions (in mm) Millimeter Inch Symbol Min Nom Max Min Nom Max R1 0.08 - - 0.003 - - q 0 3.5 7 0 3.5 7 1 0 - - 0 - - 2 11 12 13 11 12 13 3 11 12 13 11 12 13 c 0.09 - 0.20 0.004 - 0.008 L 0.45 0.60 0.75 0.018 0.024 0.030 L1 1.00 REF 0.039 REF S 0.20 - - 0.008 - - b 0.17 0.20 0.27 0.007 0.008 0.011 e 0.50 BSC. 0.020 BSC. D2 7.50 0.285 E2 7.50 0.285 Tolerances of Form and Position aaa 0.20 0.008 bbb 0.20 0.008 ccc 0.08 0.003 ddd 0.08 0.003 Table 45-14. Device and LQFP Package Maximum Weight SAM4S Table 45-15. 750 mg LQFP Package Reference JEDEC Drawing Reference MS-026 JESD97 Classification e3 Table 45-16. LQFP Package Characteristics Moisture Sensitivity Level 3 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1209 45.5 64-lead QFN Mechanical Characteristics Figure 45-5. 64-lead QFN Package Drawing Table 45-17. Device and QFN Package Maximum Weight (Preliminary) SAM4S Table 45-18. 280 QFN Package Reference JEDEC Drawing Reference MO-220 JESD97 Classification e3 Table 45-19. QFN Package Characteristics Moisture Sensitivity Level 1210 mg SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 3 45.6 64-ball WLCSP Mechanical Characteristics This package respects the recommendations of the NEMI User Group. Figure 45-6. 64-ball WLCSP Package Mechanical Drawing (SAM4SD32/SAM4SD16) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1211 Figure 45-7. 64-ball WLCSP Package Mechanical Drawing (SAM4S16/SAM4S8/SAM4S4/SAM4S2) Table 45-20. 64-ball WLCSP Package Dimensions (in mm) Common Dimensions Symbol MIN. NOM. MAX. Total Thickness A 0.455 0.494 0.533 Stand Off A1 0.17 - 0.23 Wafer Thickness A2 Body Size (4) 0.254 0.025 / 4.424 BSC(2)/3.323 BSC(3) D 4.423 BSC E 4.723 BSC(1) / 3.420 BSC(2)/3.323 BSC(3) Ball Diameter (Size) Ball/Bump Width (1) 0.25 b 0.23 0.26 eD 0.4 eE 0.4 n 64 D1 2.8 BSC E1 2.8 BSC Ball/Bump Pitch Ball/Bump Count Edge Ball Center to Center 1212 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 0.29 Table 45-20. 64-ball WLCSP Package Dimensions (in mm) (Continued) Common Dimensions Symbol MIN. NOM. Package Edge Tolerance aaa 0.03 Coplanarity (Whole Wafer) ccc 0.075 Ball/Bump Offset (Package) ddd 0.05 Ball/Bump Offset (Ball) eee Notes: 1. For SAM4SD32/SAM4SD16 2. For SAM4S16/SAM4S8 3. For SAM4S4/SAM4S2 4. SAM4SD32/SD16/S8/S16 are pin-to-pin compatible. 0.015 Figure 45-8. UBM Pad Installation Table 45-21. WLCSP Package Reference - Soldering Information (Substrate Level) UBM Pad (Under Bump Metallurgy) (E) 200 m PBO2 Opening (j) 240 m Table 45-22. Device and 64-ball WLCSP Package Maximum Weight SAM4S Table 45-23. TBD mg 64-ball WLCSP Package Characteristics Moisture Sensitivity Level Table 45-24. MAX. 1 64-ball WLCSP Package Reference JEDEC Drawing Reference Not JEDEC JESD97 Classification e1 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1213 45.7 48-lead LQFP Mechanical Characteristics Figure 45-9. 48-lead LQFP Package Drawing 1.0 1.0 1.0 1 2 3 1 Table 45-25. Device and 48-lead LQFP Package Maximum Weight SAM4S Table 45-26. 190 48-lead LQFP Package Characteristics Moisture Sensitivity Level 1214 mg SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 3 Table 45-27. 48-lead LQFP Package Reference JEDEC Drawing Reference JESD97 Classification e3 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1215 45.8 48-lead QFN Mechanical Characteristics Figure 45-10. 48-lead QFN Package Drawing Table 45-28. Device and 48-lead LQFP Package Maximum Weight SAM4S Table 45-29. 143 48-lead QFN Package Characteristics Moisture Sensitivity Level Table 45-30. mg 3 48-lead QFN Package Reference JEDEC Drawing Reference JESD97 Classification 1216 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 e3 45.9 Soldering Profile Table 45-31 gives the recommended soldering profile from J-STD-020C. Table 45-31. Soldering Profile Profile Feature Green Package Average Ramp-up Rate (217C to Peak) 3C/sec. max. Preheat Temperature 175C 25C 180 sec. max. Temperature Maintained Above 217C 60 sec. to 150 sec. Time within 5C of Actual Peak Temperature 20 sec. to 40 sec. Peak Temperature Range 260C Ramp-down Rate 6C/sec. max. Time 25C to Peak Temperature 8 min. max. Note: The package is certified to be backward compatible with Pb/Sn soldering profile. A maximum of three reflow passes is allowed per component. 45.10 Packaging Resources Land Pattern Definition. Refer to the following IPC Standards: IPC-7351A and IPC-782 (Generic Requirements for Surface Mount Design and Land Pattern Standards) http://landpatterns.ipc.org/default.asp Atmel Green and RoHS Policy and Package Material Declaration Datasheet available on www.atmel.com SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1217 46. Marking All devices are marked with the Atmel logo and the ordering code. Additional marking is as follows: YYWW V XXXXXXXXX ARM where 1218 "YY": manufactory year "WW": manufactory week "V": revision "XXXXXXXXX": lot number SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 47. Ordering Information Devices in TFBGA, VFBGA, LQFP and QFN packages can be ordered in trays or in tape and reel. Devices in a WLCSP package are available in tape and reel only. Table 47-1 provides ordering codes for tray packing. For tape and reel, append an `R' to the tray ordering code; e.g., ATSAM4SD32CA-CUR. Table 47-1. Ordering Codes for SAM4S Devices Ordering Code MRL ATSAM4SD32CA-CU A ATSAM4SD32CB-CU B ATSAM4SD32CA-CFU A ATSAM4SD32CB-CFU B ATSAM4SD32CA-AU A ATSAM4SD32CB-AU B ATSAM4SD32CA-AN A ATSAM4SD32CB-AN B ATSAM4SD32BA-MU A ATSAM4SD32BB-MU B ATSAM4SD32BA-AU A ATSAM4SD32BB-AU B ATSAM4SD32BA-AN A ATSAM4SD32BB-AN B ATSAM4SD32BA-UUR A ATSAM4SD32BB-UUR B ATSAM4SD16CA-CU A ATSAM4SD16CB-CU B ATSAM4SD16CA-CFU A ATSAM4SD16CB-CFU B ATSAM4SD16CA-AU A ATSAM4SD16CB-AU B ATSAM4SD16CA-AN A ATSAM4SD16CB-AN B ATSAM4SD16BA-MU A ATSAM4SD16BB-MU B ATSAM4SD16BA-AU A ATSAM4SD16BB-AU B ATSAM4SD16BA-AN A ATSAM4SD16BB-AN B Flash (Kbytes) SRAM (Kbytes) Package Carrier Type Operating Temperature Range 2*1024 160 TFBGA100 Tray Industrial (-40C to +85C) 2*1024 160 VFBGA100 Tray Industrial (-40C to +85C) 2*1024 160 LQFP100 Tray Industrial (-40C to +85C) 2*1024 160 LQFP100 Tray Industrial (-40C to +105C) 2*1024 160 QFN64 Tray Industrial (-40C to +85C) 2*1024 160 LQFP64 Tray Industrial (-40C to +85C) 2*1024 160 LQFP64 Tray Industrial (-40C to +105C) 2*1024 160 WLCSP64 Tape and reel Industrial (-40C to +85C) 2*512 160 TFBGA100 Tray Industrial (-40C to +85C) 2*512 160 VFBGA100 Tray Industrial (-40C to +85C) 2*512 160 LQFP100 Tray Industrial (-40C to +85C) 2*512 160 LQFP100 Tray Industrial (-40C to +105C) 2*512 160 QFN64 Tray Industrial (-40C to +85C) 2*512 160 LQFP64 Tray Industrial (-40C to +85C) 2*512 160 LQFP64 Tray Industrial (-40C to +105C) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1219 Table 47-1. 1220 Ordering Codes for SAM4S Devices (Continued) Ordering Code MRL ATSAM4SD16BA-UUR A ATSAM4SD16BB-UUR B ATSAM4SA16CA-CU A ATSAM4SA16CB-CU B ATSAM4SA16CA-CFU A ATSAM4SA16CB-CFU B ATSAM4SA16CA-AU A ATSAM4SA16CB-AU B ATSAM4SA16CA-AN A ATSAM4SA16CB-AN B ATSAM4SA16BA-MU A ATSAM4SA16BB-MU B ATSAM4SA16BA-AU A ATSAM4SA16BB-AU B ATSAM4SA16BA-AN A ATSAM4SA16BB-AN B ATSAM4S16CA-CU A ATSAM4S16CB-CU B ATSAM4S16CA-CFU A ATSAM4S16CB-CFU B ATSAM4S16CA-AU A ATSAM4S16CB-AU B ATSAM4S16CA-CFN A ATSAM4S16CB-CFN B ATSAM4S16CA-AN A ATSAM4S16CB-AN B ATSAM4S16BA-MU A ATSAM4S16BB-MU B ATSAM4S16BA-AU A ATSAM4S16BB-AU B ATSAM4S16BA-UUR A ATSAM4S16BB-UUR B ATSAM4S16BA-AN A ATSAM4S16BB-AN B ATSAM4S8CA-CU A ATSAM4S8CB-CU B SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Flash (Kbytes) SRAM (Kbytes) Package Carrier Type Operating Temperature Range 2*512 160 WLCSP64 Tape and reel Industrial (-40C to +85C) 1024 160 TFBGA100 Tray Industrial (-40C to +85C) 1024 160 VFBGA100 Tray Industrial (-40C to +85C) 1024 160 LQFP100 Tray Industrial (-40C to +85C) 1024 160 LQFP100 Tray Industrial (-40C to +105C) 1024 160 QFN64 Tray Industrial (-40C to +85C) 1024 160 LQFP64 Tray Industrial (-40C to +85C) 1024 160 LQFP64 Tray Industrial (-40C to +105C) 1024 128 TFBGA100 Tray Industrial (-40C to +85C) 1024 128 VFBGA100 Tray Industrial (-40C to +85C) 1024 128 LQFP100 Tray Industrial (-40C to +85C) 1024 128 VFBGA100 Tray Industrial (-40C to +105C) 1024 128 LQFP100 Tray Industrial (-40C to +105C) 1024 128 QFN64 Tray Industrial (-40C to +85C) 1024 128 LQFP64 Tray Industrial (-40C to +85C) 1024 128 WLCSP64 Reel Industrial (-40C to +85C) 1024 128 LQFP64 Tray Industrial (-40C to +105C) 512 128 TFBGA100 Tray Industrial (-40C to +85C) Table 47-1. Ordering Codes for SAM4S Devices (Continued) Ordering Code MRL ATSAM4S8CA-CFU A ATSAM4S8CB-CFU B ATSAM4S8CA-AU A ATSAM4S8CB-AU B ATSAM4S8CA-CFN A ATSAM4S8CB-CFN B ATSAM4S8CA-AN A ATSAM4S8CB-AN B ATSAM4S8BA-MU A ATSAM4S8BB-MU B ATSAM4S8BA-AU A ATSAM4S8BB-AU B ATSAM4S8BA-UUR A ATSAM4S8BB-UUR B ATSAM4S8BA-AN A ATSAM4S8BB-AN B ATSAM4S4CA-CU A ATSAM4S4CB-CU B ATSAM4S4CA-CFU A ATSAM4S4CB-CFU B ATSAM4S4CA-AU A ATSAM4S4CB-AU B ATSAM4S4CA-AN A ATSAM4S4CB-AN B ATSAM4S4BA-MU A ATSAM4S4BB-MU B ATSAM4S4BA-AU A ATSAM4S4BB-AU B ATSAM4S4BA-UUR A ATSAM4S4BB-UUR B ATSAM4S4BA-AN A ATSAM4S4BB-AN B ATSAM4S4AA-MU A ATSAM4S4AB-MU B ATSAM4S4AA-AU A ATSAM4S4AB-AU B Flash (Kbytes) SRAM (Kbytes) Package Carrier Type Operating Temperature Range 512 128 VFBGA100 Tray Industrial (-40C to +85C) 512 128 LQFP100 Tray Industrial (-40C to +85C) 512 128 VFBGA100 Tray Industrial (-40C to +105C) 512 128 LQFP100 Tray Industrial (-40C to +105C) 512 128 QFN64 Tray Industrial (-40C to +85C) 512 128 LQFP64 Tray Industrial (-40C to +85C) 512 128 WLCSP64 Reel Industrial (-40C to +85C) 512 128 LQFP64 Tray Industrial (-40C to +105C) 256 64 TFBGA100 Tray Industrial (-40C to +85C) 256 64 VFBGA100 Tray Industrial (-40C to +85C) 256 64 LQFP100 Tray Industrial (-40C to +85C) 256 64 LQFP100 Tray Industrial (-40C to +105C) 256 64 QFN64 Tray Industrial (-40C to +85C) 256 64 LQFP64 Tray Industrial (-40C to +85C) 256 64 WLCSP64 Reel Industrial (-40C to +85C) 256 64 LQFP64 Tray Industrial (-40C to +105C) 256 64 QFN48 Tray Industrial (-40C to +85C) 256 64 LQFP48 Tray Industrial (-40C to +85C) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1221 Table 47-1. 1222 Ordering Codes for SAM4S Devices (Continued) Ordering Code MRL ATSAM4S4AA-AN A ATSAM4S4AB-AN B ATSAM4S2CA-CU A ATSAM4S2CB-CU B ATSAM4S2CA-CFU A ATSAM4S2CB-CFU B ATSAM4S2CA-AU A ATSAM4S2CB-AU B ATSAM4S2CA-AN A ATSAM4S2CB-AN B ATSAM4S2BA-MU A ATSAM4S2BB-MU B ATSAM4S2BA-AU A ATSAM4S2BB-AU B ATSAM4S2BA-UUR A ATSAM4S2BB-UUR B ATSAM4S2BA-AN A ATSAM4S2BB-AN B ATSAM4S2AA-MU A ATSAM4S2AB-MU B ATSAM4S2AA-AU A ATSAM4S2AB-AU B ATSAM4S2AA-AN A ATSAM4S2AB-AN B SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Flash (Kbytes) SRAM (Kbytes) Package Carrier Type Operating Temperature Range 256 64 LQFP48 Tray Industrial (-40C to +105C) 128 64 TFBGA100 Tray Industrial (-40C to +85C) 128 64 VFBGA100 Tray Industrial (-40C to +85C) 128 64 LQFP100 Tray Industrial (-40C to +85C) 128 64 LQFP100 Tray Industrial (-40C to +105C) 128 64 QFN64 Tray Industrial (-40C to +85C) 128 64 LQFP64 Tray Industrial (-40C to +85C) 128 64 WLCSP64 Reel Industrial (-40C to +85C) 128 64 LQFP64 Tray Industrial (-40C to +105C) 128 64 QFN48 Tray Industrial (-40C to +85C) 128 64 LQFP48 Tray Industrial (-40C to +85C) 128 64 LQFP48 Tray Industrial (-40C to +105C) 48. Errata 48.1 Errata SAM4SD32/SD16/SA16/S16/S8 Rev. A Parts The errata are applicable to the devices in Table 48-1. Table 48-1. Device List for Errata Described in Section 48.1 Device Name Revision Chip ID SAM4SD32C A 0x29A7_0EE0 SAM4SD32B A 0x2997_0EE0 SAM4SD16C A 0x29A7_0CE0 SAM4SD16B A 0x2997_0CE0 SAM4SA16C A 0x28A7_0CE0 SAM4SA16B A 0x2897_0CE0 SAM4S16C A 0x28AC_0CE0 SAM4S16B A 0x289C_0CE0 SAM4S8C A 0x28AC_0AE0 SAM4S8B A 0x289C_0AE0 48.1.1 Flash Controller (EEFC) Issue: Flash Buffer Not Cleared The Write Buffer in the embedded Flash is not cleared after trying to write to a locked region. Therefore, the data that was previously loaded into the Write Buffer would remain in the buffer while the next page write command (e.g., WP) is being executed. Workaround: Do not do partial programming (Fill completely the Write Buffer). Note that this problem occurs only if the software tries to write into a locked region. Issue: Code Loop Optimization Cannot Be Disabled The EFC does not work after the buffer for loop optimization is disabled; in Flash Mode Register (EEFC_FMR), CLOE = 0. Workaround: The CLOE bit must be kept at 1. Issue: Erase Sector Command Cannot Be Performed If a Subsector Is Locked (ONLY in Flash Sector0) If one of subsector (Small Sector 0, Small Sector1 and Larger Sector) is locked, the Erase Sector Command (ES) is not possible on non-locked subsectors. Workaround: All the lock bits of the sector0 must be cleared prior to issuing the ES command. After the ES command has been issued, the first sector lock bits must be reverted to the state before clearing them. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1223 48.1.2 Flash Issue: Incorrect Flash Read May Occur Depending on VDDIO Voltage and Flash Wait State Flash read issues leading to wrong instruction fetch or incorrect data read may occur under the following operating conditions: VDDIO < 2.4V and Flash wait state(1) 1 If the core clock frequency does not require the use of the Flash wait state (2) (FWS = 0 in EEFC_FMR) or if only data reads are performed on the Flash (e.g., if the code is running out of SRAM), there are no constraints on VDDIO voltage. The usable voltage range for VDDIO is defined in Table 44-3 "DC Characteristics". Notes: 1. Defined by the FWS field in EEFC_FMR register. 2. See Section 44.12.9 "Embedded Flash Characteristics" for the maximum core clock frequency at zero (0) wait state. Workaround: Two workarounds are available: 1. Reduce the device speed to decrease the number of wait states to 0. 2. Copy the code from Flash to SRAM at 0 wait states and then run the code out of SRAM. The issue will be corrected in the next device revision, Marketing Revision Level B (MRL B). Please contact your local Sales Representative for further details. Issue: Read Error after a GPNVM or Lock Bit Writing The sequence below leads to a bad read value. Fail sequence is: Read Flash @ address XXX Programming Flash: Write GPNVM or Lock Bit instructions Read Flash @ address XXX Workaround: A dummy read at another address needs to be included in the sequence. Sequence is: Read Flash @ address XXX Programming Flash: Write GPNVM or Lock Bit instructions Read Flash @ address YYY (dummy read) Read Flash @ address XXX 48.1.3 Watchdog Issue: Watchdog Not Stopped in Wait Mode When the Watchdog is enabled and the bit WAITMODE = 1 is used to enter wait mode, the watchdog is not halted. If the time spent in Wait Mode is longer than the Watchdog time-out, the device will be reset if Watchdog reset is enabled. Workaround: 1224 When entering wait mode, the Wait For Event (WFE) instruction of the processor Cortex-M4 must be used with the SLEEPDEEP of the System Control Register (SCB_SCR) of the Cortex-M = 0. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 48.1.4 Brownout Detector Issue: Unpredictable Behavior if BOD is Disabled, VDDCORE is Lost and VDDIO is Connected In active mode or in wait mode, if the Brownout Detector is disabled (SUPC_MR.BODDIS = 1) and power is lost on VDDCORE while VDDIO is powered, the device might not be properly reset and may behave unpredictably. Workaround: When the Brownout Detector is disabled in active or in wait mode, VDDCORE always needs to be powered. 48.1.5 Low-power Mode Issue: Unpredictable Behavior When Entering Sleep Mode When entering Sleep mode, if an interrupt occurs during WFI or WFE (PMC_FSMR.LPM = 0) instruction processing, the ARM core may read an incorrect data, thus leading to unpredictable behavior of the software. This issue is not present in Wait mode. Workaround: The following conditions must be met: 1. The interrupt vector table must be located in Flash. 2. The Matrix slave interface for the Flash must be set to 'No default master'. This is done by setting the field DEFMSTR_TYPE to 0 in the register MATRIX_SCFG. The code example below can be used to program the NO_DEFAULT_MASTER state: MATRIX_SCFG[2] = MATRIX_SCFG_SLOT_CYCLE(0xFF) | MATRIX_SCFG_DEFMSTR_TYPE(0x0); This must be done once in the software before entering Sleep mode. 48.1.6 PIO Issue: PB4 Input Low-level Voltage Range The undershoot is limited to -0.1V. In normal operating conditions, the VIL minimum value on PB4 is limited to 0V. Workaround: The voltage on PB4 with respect to ground must be in the range -0.1V to + VDDIO + 0.4V instead of -0.3V to + VDDIO + 0.4V for all other input pins, as shown in Table 44.1 "Absolute Maximum Ratings". The minimum VIL on PB4 must be 0V instead of -0.3V for all other input pins, as shown in Table 44.3 "DC Characteristics". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1225 48.2 Errata SAM4SD32/SD16/SA16/S16/S8 Rev. B Parts The errata are applicable to the devices in Table 48-1. Table 48-2. Device List for Errata Described in Section 48.1 Device Name Revision Chip ID SAM4SD32C B 0x29A7_0EE1 SAM4SD32B B 0x2997_0EE1 SAM4SD16C B 0x29A7_0CE1 SAM4SD16B B 0x2997_0CE1 SAM4SA16C B 0x28A7_0CE1 SAM4SA16B B 0x2897_0CE1 SAM4S16C B 0x28AC_0CE1 SAM4S16B B 0x289C_0CE1 SAM4S8C B 0x28AC_0AE1 SAM4S8B B 0x289C_0AE1 48.2.1 Flash Controller (EEFC) Issue: Flash Buffer Not Cleared The Write Buffer in the embedded Flash is not cleared after trying to write to a locked region. Therefore, the data that was previously loaded into the Write Buffer would remain in the buffer while the next page write command (e.g., WP) is being executed. Workaround: Do not do partial programming (Fill completely the Write Buffer). Note that this problem occurs only if the software tries to write into a locked region. Issue: Code Loop Optimization Cannot Be Disabled The EFC does not work after the buffer for loop optimization is disabled, in Flash Mode Register (EEFC_FMR) CLOE = 0. Workaround: The CLOE bit must be kept at 1. Issue: Erase Sector Command Cannot Be Performed If a Subsector Is Locked (ONLY in Flash Sector0) If one of subsector (Small Sector 0, Small Sector1 and Larger Sector) is locked, the Erase Sector Command (ES) is not possible on non-locked subsectors. Workaround: 1226 All the lock bits of the sector0 must be cleared prior to issuing the ES command. After the ES command has been issued, the first sector lock bits must be reverted to the state before clearing them. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 48.2.2 Flash Issue: Read Error after a GPNVM or Lock Bit Writing The sequence below leads to a bad read value. Fail sequence is: Read Flash @ address XXX Programming Flash: Write GPNVM or Lock Bit instructions Read Flash @ address XXX Workaround: A dummy read at another address needs to be included in the sequence. Sequence is: Read Flash @ address XXX Programming Flash: Write GPNVM or Lock Bit instructions Read Flash @ address YYY (dummy read) Read Flash @ address XXX 48.2.3 Watchdog Issue: Watchdog Not Stopped in Wait Mode When the Watchdog is enabled and the bit WAITMODE = 1 is used to enter wait mode, the watchdog is not halted. If the time spent in Wait Mode is longer than the Watchdog time-out, the device will be reset if Watchdog reset is enabled. Workaround: When entering wait mode, the Wait For Event (WFE) instruction of the processor Cortex-M4 must be used with the SLEEPDEEP of the System Control Register (SCB_SCR) of the Cortex-M = 0. 48.2.4 Brownout Detector Issue: Unpredictable Behavior if BOD is Disabled, VDDCORE is Lost and VDDIO is Connected In active mode or in wait mode, if the Brownout Detector is disabled (SUPC_MR.BODDIS = 1) and power is lost on VDDCORE while VDDIO is powered, the device might not be properly reset and may behave unpredictably. Workaround: When the Brownout Detector is disabled in active or in wait mode, VDDCORE always needs to be powered. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1227 48.2.5 PIO Issue: PB4 Input Low-level Voltage Range The undershoot is limited to -0.1V. In normal operating conditions, the VIL minimum value on PB4 is limited to 0V. Workaround: The voltage on PB4 with respect to ground must be in the range -0.1V to + VDDIO + 0.4V instead of -0.3V to + VDDIO + 0.4V for all other input pins, as shown in Table 44.1 "Absolute Maximum Ratings". The minimum VIL on PB4 must be 0V instead of -0.3V for all other input pins, as shown in Table 44.3 "DC Characteristics". 1228 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 48.3 Errata SAM4S4/S2 Rev. A Parts The errata are applicable to the devices in Table 48-3. Table 48-3. Device List for Errata Described in Section 48.3 Device Name Revision Chip ID SAM4S4C A 0x28AB_09E0 SAM4S4B A 0x289B_09E0 SAM4S4A A 0x288B_09E0 SAM4S2C A 0x28AB_07E0 SAM4S2B A 0x289B_07E0 SAM4S2A A 0x288B_07E0 48.3.1 Flash Controller (EEFC) Issue: Erase Sector (ES) Command Cannot Be Performed If a Subsector Is Locked (ONLY in Flash sector 0) If one of the subsectors small sector 0 small sector 1 larger sector is locked within the Flash sector 0, the erase sector (ES) command cannot be processed on non-locked subsectors. Refer to the Flash overview in Section 8. "Memories". Workaround: All the lock bits of the sector 0 must be cleared prior to issuing the ES command. After the ES command has been issued, the lock bits must be reverted to the state before clearing them. 48.3.2 Flash Issue: Incorrect Flash Read May Occur Depending on VDDIO Voltage and Flash Wait State Flash read issues leading to wrong instruction fetch or incorrect data read may occur under the following operating conditions: VDDIO < 2.4V and Flash wait state(1) 1 If the core clock frequency does not require the use of the Flash wait state(2) (FWS = 0 in EEFC_FMR) or if only data reads are performed on the Flash (e.g., if the code is running out of SRAM), there are no constraints on VDDIO voltage. The usable voltage range for VDDIO is defined in Table 44-3 "DC Characteristics". Notes: 1. Defined by the FWS field in EEFC_FMR. 2. See Section 44.12.9 "Embedded Flash Characteristics" for the maximum core clock frequency at zero (0) wait state. Workaround: Two workarounds are available: 1. Reduce the device speed to decrease the number of wait states to 0. 2. Copy the code from Flash to SRAM at 0 wait states and then run the code out of SRAM. The issue will be corrected in the next device revision, Marketing Revision Level B (MRL B). Please contact your local Sales Representative for further details. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1229 48.3.3 Brownout Detector Issue: Unpredictable Behavior if BOD is Disabled, VDDCORE is Lost and VDDIO is Connected In active mode or in wait mode, if the Brownout Detector is disabled (SUPC_MR.BODDIS = 1) and power is lost on VDDCORE while VDDIO is powered, the device might not be properly reset and may behave unpredictably. Workaround: When the Brownout Detector is disabled in active or in wait mode, VDDCORE always needs to be powered. 48.3.4 Low-power Mode Issue: Unpredictable Behavior When Entering Sleep Mode When entering Sleep mode, if an interrupt occurs during WFI or WFE (PMC_FSMR.LPM = 0) instruction processing, the ARM core may read an incorrect data, thus leading to unpredictable behavior of the software. This issue is not present in Wait mode. Workaround: The following conditions must be met: 1. The interrupt vector table must be located in Flash. 2. The Matrix slave interface for the Flash must be set to `No default master'. This is done by setting the field DEFMSTR_TYPE to 0 in the register MATRIX_SCFG. The code example below can be used to program the NO_DEFAULT_MASTER state: MATRIX_SCFG[2] = MATRIX_SCFG_SLOT_CYCLE(0xFF) | MATRIX_SCFG_DEFMSTR_TYPE(0x0); This must be done once in the software before entering Sleep mode. 48.3.5 PIO Issue: PB4 Input Low-level Voltage Range The undershoot is limited to -0.1V. In normal operating conditions, the VIL minimum value on PB4 is limited to 0V. Workaround: The voltage on PB4 with respect to ground must be in the range -0.1V to + VDDIO + 0.4V instead of -0.3V to + VDDIO + 0.4V for all other input pins, as shown in Table 44.1 "Absolute Maximum Ratings". The minimum VIL on PB4 must be 0V instead of -0.3V for all other input pins, as shown in Table 44.3 "DC Characteristics". 1230 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 48.4 Errata SAM4S4/S2 Rev. B Parts The errata are applicable to the devices in Table 48-4. Table 48-4. Device List for Errata Described in Section 48.4 Device Name Revision Chip ID SAM4S4C B 0x28AB_09E1 SAM4S4B B 0x289B_09E1 SAM4S4A B 0x288B_09E1 SAM4S2C B 0x28AB_07E1 SAM4S2B B 0x289B_07E1 SAM4S2A B 0x288B_07E1 48.4.1 Flash Controller (EEFC) Issue: Erase Sector (ES) Command Cannot Be Performed If a Subsector Is Locked (ONLY in Flash sector 0) If one of the subsectors small sector 0 small sector 1 larger sector is locked within the Flash sector 0, the erase sector (ES) command cannot be processed on non-locked subsectors. Refer to the Flash overview in Section 8. "Memories". Workaround: All the lock bits of the sector 0 must be cleared prior to issuing the ES command. After the ES command has been issued, the lock bits must be reverted to the state before clearing them. 48.4.2 Brownout Detector Issue: Unpredictable Behavior if BOD is Disabled, VDDCORE is Lost and VDDIO is Connected In active mode or in wait mode, if the Brownout Detector is disabled (SUPC_MR.BODDIS = 1) and power is lost on VDDCORE while VDDIO is powered, the device might not be properly reset and may behave unpredictably. Workaround: When the Brownout Detector is disabled in active or in wait mode, VDDCORE always needs to be powered. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1231 48.4.3 PIO Issue: PB4 Input Low-level Voltage Range The undershoot is limited to -0.1V. In normal operating conditions, the VIL minimum value on PB4 is limited to 0V. Workaround: The voltage on PB4 with respect to ground must be in the range -0.1V to + VDDIO + 0.4V instead of -0.3V to + VDDIO + 0.4V for all other input pins, as shown in Table 44.1 "Absolute Maximum Ratings". The minimum VIL on PB4 must be 0V instead of -0.3V for all other input pins, as shown in Table 44.3 "DC Characteristics". 1232 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 49. Revision History In the tables that follow, the most recent version of the document appears first. Table 49-1. Doc. Date SAM4S Datasheet Rev. 11100K Revision History Changes "Features": updated "Memories" section. Added section "Safety Features Highlight". Section 8., "Memories" 09-Jun-15 Added Section 8.1.3.4 "Error Code Correction (ECC)". Section 44., "Electrical Characteristics" Added Table 44-24, "SAM4SD32/SA16/SD16 Typical Active Power Consumption with VDDCORE@ 1.2V running from Flash Memory (AMP2) or SRAM". Table 49-2. Doc. Date SAM4S Datasheet Rev. 11100J Revision History Changes "Features": updated "System" and "Peripherals" sections Section 2., "Block Diagram" Updated Figures Section 4., "Package and Pinout" 28-May-15 Modified AD13 and AD14 position in Table 4-2 "SAM4SD32/SD16/SA16/S16/S8/S4/S2 100-ball TFBGA Pinout" and Table 4-3 "SAM4SD32/SD16/SA16/S16/S8/S4/S2 100-ball VFBGA Pinout" Section 44., "Electrical Characteristics" Updated Table 44-41, "ADC Timing Characteristics" Table 44-74, "AC Flash Characteristics": added one "Endurance" value Section 48., "Errata" Section 48.1.5, "Low-power Mode" and Section 48.3.4, "Low-power Mode": modified Workaround 2 (code example) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1233 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History Changes Introduction of four new devices: ATSAM4SD32BA-UUR, ATSAM4SD32BB-UUR, ATSAM4SD16BA-UUR and ATSAM4SD16BB-UUR Modified "Description", Section 2. "Block Diagram", and Section 6.5, "ERASE Pin" Updated Table 9-1 "Real-time Event Mapping List" Added footnotes in Table 11-2 "Multiplexing on PIO Controller A (PIOA)", Table 11-3 "Multiplexing on PIO Controller B (PIOB)" and Table 11-4 "Multiplexing on PIO Controller C (PIOC)" Deleted reset value from individual register description sections (reset values are found in "register mapping" sections) Section 12., "ARM Cortex-M4 Processor" Figure 12-1 "Typical Cortex-M4 Implementation"; replaced "Cortex-M4" with "Cortex-M4F" Table 12-11 "Faults": note 1 now applied to IACCVIOL. Section 12.9.1.13 "Configurable Fault Status Register": removed `MLSPERR' bit Table 12-34 "System Timer (SYST) Register Mapping": corrected SYST_CSR reset value Section 13., "Debug and Test Features" Modified Section 13.5.2 "Debug Architecture" Section 14., "Reset Controller (RSTC)" Figure 14-3 "General Reset State": corrected signal name to vddio_nreset Section 14.4, "Functional Description": deleted subsection "Brownout Manager" and redundant subsection "Reset Controller Status Register" (register is described in Section 14.5.2, "Reset Controller Status Register") Updated Section 14.4.1, "Reset Controller Overview" 03-Apr-15 Section 14.4.3, "Reset States": organized subsections in order of reset state priority Section 14.4.4, "Reset State Priorities": reworded first paragraph Section 14.5.2, "Reset Controller Status Register": updated bit and field descriptions Section 15., "Real-time Timer (RTT)" Updated Figure 15-2 "RTT Counting" and Section 15.4 "Functional Description" Section 15.5.1 "Real-time Timer Mode Register": updated RTPRES field description Modified ALMV description in Section 15.5.2 "Real-time Timer Alarm Register" Section 15.5.2 "Real-time Timer Alarm Register": added "(cleared on read)" to each bit description Added notes in Section 15.5.3 "Real-time Timer Value Register" Section 16., "Real-time Clock (RTC)" Replaced "APB" with "System Bus" in Section 16.3, "Block Diagram" Updated "Section 16.1, "Description" and Section 16.5, "Functional Description" (removed references to the 20th century) Section 16.5.5, "RTC Internal Free Running Counter Error Checking": replaced "RTC status clear control register" with "Status Clear Command Register" Updated Section 16.5.7, "RTC Accurate Clock Calibration" (added figures and descriptions) Updated Section 16.6.2, "RTC Mode Register" and Section 16.6.11, "RTC Interrupt Mask Register" Section 17., "Watchdog Timer (WDT)" In Figure 17-2 "Watchdog Behavior", "WDT_CR = WDRSTT" replaced with "WDT_CR.WDRSTT=1" Updated Section 17.5.3 "Watchdog Timer Status Register" 1234 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History (Continued) Changes Section 18., "Supply Controller (SUPC)" Updated Figure 18-1 "Supply Controller Block Diagram". Section 18.4.2, "Slow Clock Generator": modified last paragraph with information on entering Bypass mode. Modfied Section 18.4.7.1, "Wake-up Inputs", Section 18.5.5, "Supply Controller Mode Register", Section 18.5.7, "Supply Controller Wake-up Inputs Register" and Section 18.5.8, "Supply Controller Status Register" Section 18.4.7.2, "Low-power Tamper Detection and Anti-Tampering": corrected `...LPDBCCLR bit must be set in SUPC_MR' to `...LPDBCCLR bit must be set in SUPC_WUMR'Updated Figure 18-4 "Wake-up Sources" Section 18.5.2, "Supply Controller (SUPC) User Interface": corrected reset value for SUPC_MR. Section 19., "General Purpose Backup Registers (GPBR)" Modified Section 19.1, "Description" and Section 19.2, "Embedded Characteristics" Table 19-1 "Register Mapping": added reset value 0x00000000 for all registers SYS_GPBRx Section 19.3.1, "General Purpose Backup Register x": inserted sentence "These registers are reset at first power-up and on each loss of VVDIO" Section 20., "Enhanced Embedded Flash Controller (EEFC)". Updated Section 20.2, "Embedded Characteristics" Added Figure 20-1 Flash Memory Areas Section 20.3.2, "Interrupt Sources": changed last sentence Section 20.4.1, "Embedded Flash Organization": corrected instance of command name "Get descriptor" to "Get Flash Descriptor" Figure 20-7 Command State Chart: replaced two instances of "MC_FSR" with "EEFC_FSR" 03-Apr-15 Modified Section 20.4.3.2, "Write Commands", Section 20.4.3.3, "Erase Commands", Section 20.4.3.8, "Unique Identifier Area" and Section 20.4.3.9, "User Signature Area" Section 20.5, "Enhanced Embedded Flash Controller (EEFC) User Interface": deleted address offsets from individual register descriptions (offsets are provided in Section 20-6, "Register Mapping") Modified Section 20.5.1, "EEFC Flash Mode Register", Section 20.5.2, "EEFC Flash Command Register" and Section 20.5.3, "EEFC Flash Status Register": added new field `ZERO' (register bits 26:25) Updated Section 20-6, "Register Mapping" Section 21., "Fast Flash Programming Interface (FFPI)" Section 21-1, "16-bit Parallel Programming Interface": renamed figure Section 22., "Cortex-M Cache Controller (CMCC)" Section 22.4.3, "Cache Performance Monitoring": corrected "MODE field of the CMCC_CFG register" to "MODE field of the CMCC_MCFG register" Table 22-1 "Register Mapping": removed CMCC_CTRL reset value for this write-only register; replaced "Cache ..." with "Cache Controller ..." in "Register" column contents Updated Section 22.5.1, "Cache Controller Type Register" Updated bit descriptions in Section 22.5.3, "Cache Controller Control Register", Section 22.5.4, "Cache Controller Status Register", Section 22.5.5, "Cache Controller Maintenance Register 0", Section 22.5.8, "Cache Controller Monitor Enable Register" and Section 22.5.9, "Cache Controller Monitor Control Register". Section 22.5.7, "Cache Controller Monitor Configuration Register": changed access from Write-only to Read/Write. Section 22.5.8, "Cache Controller Monitor Enable Register": removed reset value from several write-only registers (reset values are found in Table 22-1 "Register Mapping") and changed access from Write-only to Read/Write. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1235 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History (Continued) Changes Section 23., "Cyclic Redundancy Check Calculation Unit (CRCCU)" Modified Section 23.1, "Description" and Section 23.2, "Embedded Characteristics" Updated Figure 23-1, "Block Diagram"Section 23.5.2, "CRC Calculation Unit Operation": reworded text describing how to start the CRCCU Table 23-3 "Register Mapping": deleted reset value 0x00000000 from all write-only registers Section 23.6, "Transfer Control Registers Memory Mapping": added reset values to Table 23-2 "Transfer Control Register Memory Mapping" Section 23.7, "Cyclic Redundancy Check Calculation Unit (CRCCU) User Interface": Modified Section 23.7.10, "CRCCU Mode Register" and Section 23.7.11, "CRCCU Status Register" Section 26., "Static Memory Controller (SMC)" Added Latch Enables for NAND Flash in Table 26-1 "I/O Line Description". Updated Section 26.9.5, "Register Write Protection" and added information on write protection to Section 26.16.1, "SMC Setup Register", Section 26.16.2, "SMC Pulse Register", Section 26.16.3, "SMC Cycle Register" and Section 26.16.4, "SMC MODE Register". Updated Section 26.16.8, "SMC Write Protection Mode Register", Section 26.16.9, "SMC Write Protection Status Register"and Section 26.10, "Scrambling/Unscrambling Function". Section 27., "Peripheral DMA Controller (PDC)" Added Section 27.3, "Peripheral DMA Controller Connections" Table 27-2 "Register Mapping": removed reset value from Transfer Control Register / PERIPH_PTCR (register access is write-only) 03-Apr-15 Modified Section 27.6.10, "Transfer Status Register" Section 28., "Clock Generator" Section 28.2, "Embedded Characteristics" : removed bullet "Write Protected Registers". Section 28.4.2, "Slow Clock Crystal Oscillator": deleted redundant content from end of section; appended "OSCBYPASS bit of the Supply Controller Mode Register (SUPC_MR) needs to be set at 1" to read "OSCBYPASS bit of the Supply Controller Mode Register (SUPC_MR) needs to be set at 1 prior to writing a 1 in bit XTALSEL". Added Section 28.5.5, "Bypassing the Main Crystal Oscillator". Updated Section 28.6.1, "Divider and Phase Lock Loop Programming". Section 29., "Power Management Controller (PMC)" Updated Section 29.2, "Embedded Characteristics" and Section 29.7, "USB Clock Controller": Modified Section 29.11, "Fast Startup" Table 29-3 "Register Mapping": changed PMC_SR reset value to 0x0003_0008 (was 0x0001_0008) Modified Section 29.17.7, "PMC Clock Generator Main Oscillator Register", Section 29.17.8, "PMC Clock Generator Main Clock Frequency Register", Section 29.17.9, "PMC Clock Generator PLLA Register" and Section 29.17.10, "PMC Clock Generator PLLB Register" Section 31., "Parallel Input/Output Controller (PIO)" Replaced all instances of "PIO clock" and "PIO controller clock" with "peripheral clock" Renamed "MCK" or "master clock" to "Peripheral clock" as needed Section 31.2, "Embedded Characteristics": replaced bullet "Write Protect Registers" with "Register Write Protection" Updated Figure 31-2, "I/O Line Control Logic" and Figure 31-5, "Input Debouncing Filter Timing" 1236 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History (Continued) Changes Updated Section 31.5.1, "Pull-up and Pull-down Resistor Control" and Section 31.5.3, "Peripheral A or B or C or D Selection" Section 31.5.10, "Input Edge/Level Interrupt": edited, reorganized and reformatted example of interrupt generation (migrated configuration subsections into Table 31-3 "Configuration for Example Interrupt Generation") Moved Section 31.5.14, "I/O Lines Programming Example" to appear before Section 31.5.15, "Register Write Protection" Section 31.6.38, "PIO Additional Interrupt Modes Mask Register": modified P0-P31 bit description Replaced instances of "div_slclk" with "div_slck"; replaced instances of "slow_clock" with "slck" Added bit configuration values in Section 31.6.50, "PIO Parallel Capture Interrupt Enable Register", Section 31.6.51, "PIO Parallel Capture Interrupt Disable Register" and Section 31.6.52, "PIO Parallel Capture Interrupt Mask Register" Section 32., "Synchronous Serial Controller (SSC)" Renamed "Master Clock" or "MCK" to "peripheral clock" Updated Figure 32-1 "Block Diagram" and Figure 32-5 "Time Slot Application Block Diagram", Figure 32-15 "Receive Compare Modes" Modified Section 32.9 "Synchronous Serial Controller (SSC) User Interface", Section 32.9.17 "SSC Write Protection Mode Register", Section 32.9.18 "SSC Write Protection Status Register", Section 32.9.6 "SSC Transmit Frame Mode Register" Replaced "16" with "256" in Section 32.8.5.1 "Frame Sync Data", Section 32.8.6.1 "Compare Functions" and Table 32-4 "Data Frame Registers" Section 33., "Serial Peripheral Interface (SPI)" Updated Section 33.3 "Block Diagram"fModified Section 33.7.3.2, "Master Mode Flow Diagram": replaced instance of "Peripheral Data Controller" with "PDC" 03-Apr-15 Modified Section 33.7.3 "Master Mode Operations", Section 33.8.1 "SPI Control Register", Section 33.8.2 "SPI Mode Register", Section 33.8.5 "SPI Status Register", Section 33.8.9 "SPI Chip Select Register" and Section "Transfer Size" Section 33.7.1 "Modes of Operation": updated text relating to Slave mode Modified last paragraph in Section 33.7.3.5 "Peripheral Selection" and Section 33.7.3.8 "Peripheral Deselection without PDC" Section 34., "Two-wire Interface (TWI)" Reformatted graphics for improved readability Updated Section 34.1, "Description", Table 34-1 "Atmel TWI Compatibility with I2C Standard", Figure 34-1 Block Diagram and Figure 34-9 Master Read with Multiple Data Bytes Section 34.7.3.3, "Programming Master Mode": added note to end of section "Data Transmit with the PDC" and "Data Receive with the PDC": updated step 2 Replaced instances of "shift register" with "internal shifter" Section 34.8.5, "TWI Clock Waveform Generator Register": replaced tmck with tperipheral clock in CLDIV and CHDIV field description Table 34-7 "Register Mapping": replaced TWI_THR reset value "0x00000000" with "-" In register description sections: removed reset values from write-only registers Moved section "Master Mode" into Section 34.2, "Embedded Characteristics" Replaced Section 6. "Application Block Diagram" with updated Section 34.5, "I/O Lines Description" Moved section "Slave Mode" into Section 34.7, "Functional Description" Updated "Clock Synchronization in Write Mode" Section 34.7.3.3, "Programming Master Mode": replaced all occurrences of "TWIHS_" with "TWI_". SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1237 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History (Continued) Changes Section 34.8, "Two-wire Interface (TWI) User Interface": - removed line "Reset:" from above all register tables; redundant with Table 34-7 "Register Mapping". - replaced instance of acronym "TWI2" with "TWI" in section title Figure 34-4 Master Mode Typical Application Block Diagram: renamed lines from host with SDA and SCL; placed TWD and TWCK in host block Updated Section 34.7.3.4, "Master Transmitter Mode", Section 34.7.3.5 "Master Receiver Mode", Figure 34-23 Slave Mode Typical Application Block Diagram:, Figure 34-24 Read Access Ordered by a Master, Figure 34-25 Write Access Ordered by a Master, Figure 34-26 Master Performs a General Call, Figure 34-28 Clock Synchronization in Write Mode, Figure 34-31 Read Write Flowchart in Slave Mode, Section 34.8.1, "TWI Control Register", Section 34.8.5, "TWI Clock Waveform Generator Register" and Section 34.8.6, "TWI Status Register" Section 35., "Universal Asynchronous Receiver Transmitter (UART)" Figure 35-1 UART Block Diagram: changed `MCK' to `peripheral clock'; added `bus clock' to diagram. In diagrams and equations: changed `MCK' to `peripheral clock' Figure 35-2 Baud Rate Generator: removed `(PMC)' from figure. Section 35.5.1, "Baud Rate Generator": deleted equation for Baud Rate calculation. Now in Section 35.6.9, "UART Baud Rate Generator Register". Section 35.5.2.4, "Receiver Overrun": replaced "(or the Peripheral Data Controller or DMA Controller)" with "(or the PDC)" Section 35.5.4, "Peripheral DMA Controller (PDC)": replaced "peripheral data controller" with "PDC" Section 35.6.6, "UART Status Register": replaced "Peripheral Data Controller" with "PDC" in ENDRX and ENDTX bit descriptions 03-Apr-15 Section 35.6.9, "UART Baud Rate Generator Register": added equation to CD bit description. Section 36., "Universal Synchronous Asynchronous Receiver Transceiver (USART)" Replaced all references to `MCK' with 'peripheral clock' Removed section "Application Block Diagram" Modified Figure 36-1, "USART Block Diagram", Figure 36-3, "Fractional Baud Rate Generator" and Figure 36-36, "Example of RTS Drive with Timeguard" Updated Section 36.2, "Embedded Characteristics" Modified Table 36-15 "Register Mapping" Updated Table 36-7 "Possible Values for the Fi/Di Ratio" Modified Section 36.5.3, "Interrupt Sources" and Section 36.6.1, "Baud Rate Generator" Removed all references to bit RXIDLEV Replaced bit ITERATION with bit ITER (US_CSR register) Section 36.6.1.3, "Baud Rate in Synchronous Mode or SPI Mode": replaced "CLK0" with "CLKO" Modified Section 36.6.3.8 "Parity", Section 36.6.3.3 "Asynchronous Receiver" Section 36.6.3.8 "Parity", "Transmit Character Repetition" and "Disable Successive Receive NACK" Modified Section 36.6.10, "Register Write Protection", Section 36.7.1, "USART Control Register", Section 36.7.3, "USART Mode Register" , , Section 36.7.5, "USART Interrupt Enable Register", Section 36.7.6, "USART Interrupt Enable Register (SPI_MODE)", Section 36.7.7, "USART Interrupt Disable Register", Section 36.7.8, "USART Interrupt Disable Register (SPI_MODE)", Section 36.7.9, "USART Interrupt Mask Register", Section 36.7.10, "USART Interrupt Mask Register (SPI_MODE)", Section 36.7.11, "USART Channel Status Register", Section 36.7.12, "USART Channel Status Register (SPI_MODE)", Section 36.7.15, "USART Baud Rate Generator Register", Section 36.7.16, "USART Receiver Time-out Register", Section 36.7.17, "USART Transmitter Timeguard Register" and Section 36.7.21, "USART Manchester Configuration Register" 1238 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History (Continued) Changes Section 37., "Timer Counter (TC)" "Master clock" or "MCK" replaced with "peripheral clock" Replaced all occurrences of `quadrature decoder logic' with `quadrature decoder' or `QDEC' Modified Section 37.1, "Description" Modified Section 37.2, "Embedded Characteristics" Modified Section 37.5.2, "Power Management" and Section 37.5.3, "Interrupt Sources" Section 37.6.14.2, "Input Pre-processing": deleted sentence "Filters can be disabled using the FILTER bit in the TC_BMR" Updated Figure 37-16, "Input Stage" Section 37.6.14, "Quadrature Decoder": removed subsection "Missing Pulse Detection and Auto-correction" Modified Section 37.6.14.4, "Position and Rotation Measurement" and Section 37.6.14.5, "Speed Measurement" Updated Section 37.6.17, "Register Write Protection" Section 37.7.2, "TC Channel Mode Register: Capture Mode": in `Name' line, replaced "(WAVE = 0)" with "(CAPTURE_MODE)" Section 37.7.3, "TC Channel Mode Register: Waveform Mode": in `Name' line, replaced "(WAVE = 1)" with "(WAVEFORM_MODE)" Updated Section 37.7.5, "TC Counter Value Register", Section 37.7.6 "TC Register A", Section 37.7.7 "TC Register B" , Section 37.7.8 "TC Register C", Section 37.7.9 "TC Status Register" and , Section 37.7.14, "TC Block Mode Register"Section 37.7.18, "TC QDEC Interrupt Status Register" and Section 37.7.20, "TC Write Protection Mode Register" Section 38., "High Speed Multimedia Card Interface (HSMCI)" 03-Apr-15 Section 38.1, "Description": removed sentence "Only one slot can be selected at a time (slots are multiplexed)" Added Section 38.14.19, "HSMCI FIFOx Memory Aperture" Section 39., "Pulse Width Modulation Controller (PWM)" Updated Section 39.2, "Embedded Characteristics" Section 39.6.2.2, "Comparator": Corrected the PWM waveform period formulas. Updated Table 39-4 "Fault Inputs" and Figure 39-5. "Waveform Properties". Replaced "Master Clock (MCK)", "MCK" or "master clock" with "peripheral clock"; Updated Section 39.5.2, "Power Management" and Section 39.5.3, "Interrupt Sources" Corrected register name PWM_CPRx to PWM_CPRDx Section 39.6.2.7, "Synchronous Channels": corrected paragraph beginning with`If a channel x is defined as a synchronous channel'. Updated Table 39-6 "Register Mapping" Updated Section 39.7.23, "PWM Fault Mode Register", Section 39.7.24, "PWM Fault Status Register", Section 39.7.25, "PWM Fault Clear Register", Section 39.7.27, "PWM Fault Protection Enable Register" Section 39.7.30, "PWM Write Protection Control Register" and Section 39.7.31, "PWM Write Protection Status Register": removed reset values. Changed CPRE bit description in Section 39.7.36, "PWM Channel Mode Register". Added Table 39-17 "Event Line Generation Waveform (Example)" Section 40., "USB Device Port (UDP)" Table 40-6, Register Mapping: modified footnote No. 1. Section 40.7.4, "UDP Interrupt Enable Register": modified WAKEUP bit description "Using Endpoints With Ping-pong Attributes": Replaced Bank 0 with Bank 1 in step 12 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1239 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History (Continued) Changes Section 41., "Analog Comparator Controller (ACC)" Added Table 41-1 "List of External Analog Data Inputs" Changed all occurrences of `MCK' to `peripheral clock'. Updated Table 41-2 "ACC Pin List" Updated Figure 41-1, "Analog Comparator Controller Block Diagram" Section 41.7.2, "ACC Mode Register": replaced two instances of "CF" with "CE" in SELFS bit description Section 41.7.6, "ACC Interrupt Status Register": added (cleared on read) to CE bit description Section 42., "Analog-to-Digital Converter (ADC)" Corrected ADC_SR to ADC_ISR in Section 42.6.5, "Conversion Results". Figure 42-1 "Analog-to-Digital Converter Block Diagram": Added bus clock and added ADCClock output from Control Logic block Revised Section 42.6.1, "Analog-to-Digital Conversion" Added Section 42.6.2, "ADC Clock" Section 42.6.3, "ADC Reference Voltage": changed title (was "Conversion Reference") Modified Figure 42-4 "EOCx and DRDY Flag Behavior" and Figure 42-5 "EOCx, OVREx and GOVREx Flag Behavior" Modified warning below Figure 42-5 "EOCx, OVREx and GOVREx Flag Behavior". Section 42.6.8, "Comparison Window": Removed paragraph on LOWRES bit use. Updated Section 42.6.9, "Differential Inputs" 03-Apr-15 Modified Table 42-5 "Gain of the Sample and Hold Unit" and Table 42-6 "Offset of the Sample and Hold Unit". Section 42.6.10, "Input Gain and Offset": all references to "OFFSET" bit changed to OFFx. Added Figure 42-8 "Buffer Structure". Modified Section 42.7.2, "ADC Mode Register", Section 42.7.6, "ADC Channel Disable Register", Section 42.7.12, "ADC Interrupt Status Register", Section 42.7.14, "ADC Extended Mode Register", Section 42.7.16, "ADC Channel Gain Register" Replaced references to vrefin by VADVREF in text and figures. Section 42.6.12 "Automatic Calibration": Removed sentence on ADC running mode. Replaced instances of "ADCClock" with "ADC clock" or acronym "ADCCLK" throughout Section 43., "Digital-to-Analog Converter Controller (DACC)" MCK replaced with Peripheral clock Updated Section 43.2, "Embedded Characteristics" Updated Figure 43-1 "DACC Block Diagram" Section 43.6.6, "DACC Timings": replaced two instances of "DACC clock periods" with "peripheral clock periods" Table 43-3 "Register Mapping": - Removed reset value from write-only register DACC_CDR - Displayed offset ranges 0x34-0x90 and 0x98-0xE0 as "Reserved" Modified Section 43.7.2, "DACC Mode Register" Removed references to Sleep mode and refresh period 1240 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-3. Doc. Date SAM4S Datasheet Rev. 11100I Revision History (Continued) Changes Section 44., "Electrical Characteristics": Updated Table 44-27, "4/8/12 MHz RC Oscillators Characteristics" Updated parameter definition for Rpara(standby) and Cpara(standby) in Table 44-33, "XIN Clock Electrical Characteristics (In Bypass Mode)" Updated SSC4 and SSC7 values and removed Note 1 in Table 44-66, "SSC Timings" Removed footnotes from Table 44-31, "3 to 20 MHz Crystal Oscillator Characteristics" 03-Apr-15 Updated tTRACKTIM value in Table 44-41, "ADC Timing Characteristics" Replaced tof symbol with tfo in Table 44-72, "Two-wire Serial Bus Requirements" Section 45., "Mechanical Characteristics" Updated Section 45.6, "64-ball WLCSP Mechanical Characteristics" Section 48., "Errata" Added limitation on PB4 Input Voltage Range on Rev. A and Rev. B Parts (Section 48.1.6, "PIO", Section 48.2.5, "PIO", Section 48.3.5, "PIO" and Section 48.4.3, "PIO") SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1241 Table 49-4. SAM4S Datasheet Rev. 11100H Revision History Doc. Date Changes Section 30. "Chip Identifier (CHIPID)" Table 30-1 "SAM4S Chip ID Registers": updated with Rev B values Section 30.3.1 "Chip ID Register": - field "EPROC: added new row with value 0, name SAMx7, description Cortex-M7 - field "NVPSIZ: changed name and description for value 8 - field "SRAMSIZ: changed name and description for value 2 Section 30.3.2 "Chip ID Extension Register": in EXID field description, replaced "bit" with "field" Section 44. "Electrical Characteristics": Updated and harmonized parameter symbols throughout Table 44-3 "DC Characteristics": updated footnotes Table 44-4 "1.2V Voltage Regulator Characteristics": replaced two footnotes with single footnote for VDDIN conditions; deleted "Cf. External Capacitor Requirements" from CDIN and CDOUT conditions Table 44-5 "Core Power Supply Brownout Detector Characteristics": added parameter "Reset Period" Table 44-8 "Zero-Power-on Reset Characteristics": modified parameter name "Reset Time-out Period" to "Reset Period" Section 44.4.2.1 "Sleep Mode": deleted sentence "Table 44-14 shows the current consumption in typical conditions"; 08-Jan-15 corrected cross-reference link in title of Figure 44-6 Figure 44-9 "Measurement Setup for Wait Mode": replaced "3.3V" with "3.6V" Table 44-21 "SAM4S4/2 Active Power Consumption with VDDCORE @ 1.2V Running from Flash Memory or SRAM": added footnote "Flash Wait State (FWS) in EEFC_FMR adjusted versus core frequency" Table 44-22 "SAM4S16/S8 Active Power Consumption with VDDCORE @ 1.2V Running from Flash Memory or SRAM": added "AMP2" caption to SRAM column Table 44-27 "32.768 kHz Crystal Oscillator Characteristics": added "Allowed Crystal Capacitance Load" parameter Figure 44-13 "32.768 kHz Crystal Oscillator Schematic": added label "Ccrystal" Added Section 44.5.5 "32.768 kHz XIN32 Clock Input Characteristics in Bypass Mode" Table 44-30 "3 to 20 MHz Crystal Oscillator Characteristics": added "Allowed Crystal Capacitance Load" parameter Table 44-31 "3 to 20 MHz Crystal Characteristics": corrected ESR unit `W' to `' Table 44-32 "XIN Clock Electrical Characteristics (In Bypass Mode)": for RPARASTANDBY, replaced "Impedance" with "Resistance" in parameter description and corrected unit `W' to `' Updated Figure 44-16 "XIN Clock Timing" Figure 44-21 "Simplified Acquisition Path": added caption "ADC Input"; replaced caption "12-bit ADC Core" with "12-bit ADC" 1242 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-4. SAM4S Datasheet Rev. 11100H Revision History (Continued) Doc. Date Changes Added "Symbol" column to Table 44-57 "Static Performance Characteristics", Table 44-58 "Dynamic Performance Characteristics", Table 44-59 "Analog Outputs", and Table 44-60 "Analog Comparator Characteristics" Section 44.11 "Temperature Sensor": specified instances of "27C" as ambient temperature Table 44-63 "I/O Characteristics": added parameter "Maximum I/O skew" Section 44.12.3.1 "Maximum SPI Frequency": - under "Master Write Mode", replaced "the maximum SPI frequency is the one from the pad" with "the maximum SPI frequency is defined by the pin FreqMax value - updated content under "Master Read Mode" Table 44-65 "SSC Timings": in Min/Max values for SSC4 and SSC7, corrected links to footnote 2 Section 44.12.9 "Embedded Flash Characteristics": in first paragraph, corrected "field FWS of the MC_FMR" to "field FWS of the EEFC_FMR" Section 45. "Mechanical Characteristics" Inserted heading Section 45.1 "100-lead LQFP Mechanical Characteristics" Inserted heading Section 45.2 "100-ball TFBGA Mechanical Characteristics" Inserted heading Section 45.3 "100-ball VFBGA Mechanical Characteristics" Inserted heading Section 45.4 "64-lead LQFP Mechanical Characteristics" Table 45-16 "LQFP Package Characteristics": corrected title (was "LQFP and QFN Package Characteristics") 08-Jan-15 Inserted heading Section 45.5 "64-lead QFN Mechanical Characteristics" Inserted heading Section 45.6 "64-ball WLCSP Mechanical Characteristics" Inserted heading Section 45.7 "48-lead LQFP Mechanical Characteristics" and added sentence "This package respects the recommendations of the NEMI User Group." Inserted heading Section 45.8 "48-lead QFN Mechanical Characteristics" and added sentence "This package respects the recommendations of the NEMI User Group." Table 45-29 "48-lead QFN Package Characteristics": corrected title (was "48-lead LQFP Package Characteristics") and changed Moisture Sensitivity Level from 1 to 3 Table 45-30 "48-lead QFN Package Reference": corrected title (was "48-lead LQFP Package Reference") Added Section 46. "Marking" Section 47. "Ordering Information": Table 47-1 "Ordering Codes for SAM4S Devices": added ordering codes for MRL `B' Section 48. "Errata" Section 48.1 "Errata SAM4SD32/SD16/SA16/S16/S8 Rev. A Parts": added Section 48.1.5 "Low-power Mode" Added Section 48.2 "Errata SAM4SD32/SD16/SA16/S16/S8 Rev. B Parts" Section 48.3 "Errata SAM4S4/S2 Rev. A Parts": added Section 48.3.4 "Low-power Mode" Added Section 48.4 "Errata SAM4S4/S2 Rev. B Parts" . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1243 Table 49-5. Doc. Date SAM4S Datasheet Rev. 11100G Revision History Changes Table 3-1 "Signal Description List": WKUP[15:0] voltage reference type added. In Figure 5-4 "Backup Battery", modified ADC, DAC, Analog Comparator Supply from 2.0V to 2.4V Modified Section 6.5 "ERASE Pin". Modified bullet list on use of erase commands depending on sector size in Section 8.1.3.1 "Flash Overview" Modified Section 8.1.3.5 "Security Bit", Section 8.1.3.11 "GPNVM Bits" and Section 8.1.4 "Boot Strategies". Section 24. "Boot Program" Section 24.5.4 "In Application Programming (IAP) Feature": 5th sentence: added "...the EFC number..." 27-May-14 Section 29. "Power Management Controller (PMC)" Section 29.17.9 "PMC Clock Generator PLLA Register": Min value for bit MULA corrected to 4 from 7. Section 29.17.10 "PMC Clock Generator PLLB Register": Min value for bit MULB corrected to 4 from 1. Section 44. "Electrical Characteristics" Added Table 44-24 "Typical Power Consumption on VDDCORE (VDDIO = 3.3V, TA = 25C)". Table 44-73 "AC Flash Characteristics": Added parameter Erase Pin Assertion Time. Section 48. "Errata" Added Section Issue: and Section Issue: "Incorrect Flash Read May Occur Depending on VDDIO Voltage and Flash Wait State". 1244 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-6. Doc. Date SAM4S Datasheet Rev. 11100F 29-Jan-14 Revision History Changes Update to add SAM4S4 and SAM4S2 devices. "Description" 48-pin package option added at end of section. "Features" "System": Added bullet on tamper detection and anti-tampering feature "Packages" : Modified dimensions of 64-ball WLCSP package used for SAM4S16/S8. Added 48-lead package options. Section 1. "Configuration Summary" Table 1-2, "Configuration Summary for SAM4S8/S4/S2 Devices" added. Section 2. "Block Diagram" Figure 2-5, "SAM4S4/S2 100-pin Version Block Diagram", Figure 2-6, "SAM4S4/S2 64-pin Version Block Diagram" and Figure 2-7, "SAM4S4/S2 48-pin Version Block Diagram" added. Section 3. "Signal Description" Added fault input number and added comment for "PWMFI0-2" ("PWM Fault Input" ) signal in Table 3-1 "Signal Description List": Available on SAM4S4/S2 only. Section 4. "Package and Pinout" 29-Jan-14 Added Table 4-6, "SAM4S4/S2 64-ball WLCSP Pinout". Added Section 4.3 "48-lead Packages and Pinouts". Section 5. "Power Considerations" Figure 5-2, "Single Supply": Modified note with restrictions after the figure. Figure 5-3, "Core Externally Supplied": Changed voltage for ADC, DAC, Analog Comparator Supply. Modified note with restrictions after the figure. Removed redundant Figure 5-4. Wake-up Source. Section 6. "Input/Output Lines" Added Section 6.6 "Anti-tamper Pins/Low-power Tamper Detection". Section 8. "Memories" Section 8.1.1 "Internal SRAM", Section 8.1.3 "Embedded Flash", Table 8-2, "Lock Bit Number", Section 8.1.3.11 "GPNVM Bits" Added SAM4S4 and SAM4S2 devices. Section 10. "System Controller" Removed redundant Figure 10-1. System Controller Block Diagram. Section 11. "Peripherals" Table 11-2, "Multiplexing on PIO Controller A (PIOA)" updated with Peripheral D information and note on PWMFI signals available for SAM4S4/S2 only. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1245 Table 49-6. Doc. Date SAM4S Datasheet Rev. 11100F 29-Jan-14 Revision History (Continued) Changes Section 12. "ARM Cortex-M4 Processor" Section 12.5.3 "Power Management Programming Hints": in 2nd instruction line, replaced "WFE(void)" with "WFI(void)" to match `Wait For Interrupt' and in 2nd instruction line, replaced "WFE(void)" with "WFI(void)" to match `Wait For Interrupt' Section 12.9.1.2 "CPUID Base Register": updated `Constant' field description Section 12.9.1.5 "Application Interrupt and Reset Control Register": updated `VECTCLRACTIVE' and `VECTRESET' field descriptions Section 12.9.1.7 "Configuration and Control Register": updated `USERSETMPEND' field description Section 12.9.1.16 "MemManage Fault Address Register": updated `ADDRESS' field description Section 12.9.1.17 "Bus Fault Address Register": updated `ADDRESS' field description Section 12.10.1.1 "SysTick Control and Status": updated `TICKINT' and `ENABLE' field descriptions Section 12.10.1.2 "SysTick Reload Value Registers": updated `RELOAD' field description Section 12.10.1.3 "SysTick Current Value Register": updated `CURRENT' field description Section 12.10.1.4 "SysTick Calibration Value Register": updated register reset value; updated `TENMS' and `SKEW' field descriptions. Section 12.11.2.2 "MPU Control Register": updated `ENABLE' field description. Section 12.11.2.3 "MPU Region Number Register": updated `REGION' field description. Updated Section 12.11.2.4 "MPU Region Base Address Register". Added Section 12.11.2.6 "MPU Region Base Address Register Alias 1"to Section 12.11.2.11 "MPU Region Attribute and Size Register Alias 3". Corrected "Sterling Pound" symbol () to "less than or equal to" symbol () in operation description in Section 12.6.7 "Saturating Instructions". Table 12-30 "Mapping of Interrupts to the Interrupt Variables": updated count range in "Interrupts" column. Section 14. "Reset Controller (RSTC)" Figure 14-3 "General Reset State": replaced "backup_nreset" with "vddbu_nreset". Section 14.4.2.2 "NRST External Reset Control": replaced "ext_nreset" with "exter_nreset". Section 14.4.4.2 "Backup Reset": replaced "core_backup_reset" with "vddcore_nreset"; reworded content to improve comprehension. RSTTYP information corrected in Section 14.4.6 "Reset Controller Status Register". Section 14.5.1 "Reset Controller Control Register": updated EXTRST value 1 description (deleted phrase "and resets the processor and the peripherals"). Section 14.5.3 "Reset Controller Mode Register": inserted sentence "This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_WPMR)." Section 15. "Real-time Timer (RTT)" Figure 15-1 "Real-time Timer": replaced "16-bit Divider" with "16-bit Prescaler. Revised Section 15.4 "Functional Description". Section 15.5.4 "Real-time Timer Status Register": updated RTTINC bit description. 1246 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-6. Doc. Date SAM4S Datasheet Rev. 11100F 29-Jan-14 Revision History (Continued) Changes Section 16. "Real-time Clock (RTC)" Section 16.1 "Description": updated to explain need for accurate external 32.768 kHz clock Section 16.2 "Embedded Characteristics": added feature "Write-Protected Registers" Section 16.5.6 "Updating Time/Calendar": reworded second paragraph for clarity Section 16.5.7 "RTC Accurate Clock Calibration": replaced sentence "The period interval between 2 correction events is programmable in order to cover the possible crystal oscillator clock variations" with "According to the CORRECTION, NEGPPM and HIGHPPM values configured in the RTC Mode Register (RTC_MR), the period interval between two correction events differs" Section 16.6.1 "RTC Control Register", Section 16.6.2 "RTC Mode Register", Section 16.6.5 "RTC Time Alarm Register", Section 16.6.6 "RTC Calendar Alarm Register": added sentence "This register can only be written if the WPEN bit is cleared in the System Controller Write Protection Mode Register (SYSC_WPMR)" and updated description of UPDCAL bit Section 16.6.2 "RTC Mode Register": corrected typo (THIGH value 2 description now reads "3.91 ms") Section 18. "Supply Controller (SUPC)" Section 18.1 "Embedded Characteristics": added bullets on tamper detection and on anti-tampering. Figure 18-1 "Supply Controller Block Diagram" modified. Section 18.3.4 "Supply Monitor": Supply Monitor sampling mode, power reduction factor: replaced incorrect values of 32, 256 or 2048 by the correct values of 2, 16 and 128. Section 18.3.6.2 "Brownout Detector Reset": Reworked 1st paragraph for clarity Section 18.3.7.1 "Wake-up Inputs": corrected WKUPPLx pins to WKUPTx pins. WKUP0, WKUP15 references changed to WKUPx. Figure 18-4 "Wake-up Sources": Defined a section of the graphic as Low-power Tamper Detection Logic. Section 18.3.7.2 "Low-power Tamper Detection and Anti-Tampering": Changed all references to RTCOUT1 and RTCOUT 0 to RTCOUTx. Other minor modifications to improve clarity. Figure 18-5 "Low-power Debouncer (Push-to-Make Switch, Pull-up Resistors)", Figure 18-6 "Low-power Debouncer (Push-to-Break Switch, Pull-down Resistors)", Figure 18-7 "Using WKUP Pins Without RTCOUTx Pins": Modified pin names. Added Section 18.3.8 "Register Write Protection". In Section 18.4.9 "System Controller Write Protection Mode Register", updated register name and bit descriptions. Added Section 18.3.9 "Register Bits in Backup Domain (VDDIO)". Section 18.4.3 "Supply Controller Control Register": Added sentence on WPEN bit below register table and added note to descriptions of bits VROFF and XTALSEL indicating the bits are in the backup domain. Section 18.4.5 "Supply Controller Mode Register": Added sentence on WPEN bit below register table and added note to all bit descriptions except bit KEY indicating the bits are in the backup domain Section 18.4.4 "Supply Controller Supply Monitor Mode Register", , Section 18.4.6 "Supply Controller Wake-up Mode Register" and Section 18.4.7 "Supply Controller Wake-up Inputs Register": Added sentence on WPEN bit below register table and added a sentence below the register tables stating that the register is located in the backup domain Section 18.4.7 "Supply Controller Wake-up Inputs Register": corrected register name (was "System Controller WakeUp Inputs Register") SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1247 Table 49-6. Doc. Date SAM4S Datasheet Rev. 11100F 29-Jan-14 Revision History (Continued) Changes Section 20. "Enhanced Embedded Flash Controller (EEFC)" Corrected partial programming boundary from 32-bit to 64-bit and reworked Section 20.4.3.2 "Write Commands" and all sub-sections with figures Figure 20-7 Full Page Programming to Figure 20-9 Programming Bytes in the Flash. In Section 20.4.3.3 "Erase Commands", modified paragraph on Erase pages (EPA) and Erase sector (ES) commands, as well as Table 20-4 "FARG Field for EPA Command". Added "small sector" text as limitations in Table 20-4 "FARG Field for EPA Command". Added notes when FARG exceeds limits in Section 20.4.3.4 "Lock Bit Protection". Re-worked Section 20.4.3.5 "GPNVM Bit" and added title in Section 20.4.3.6 "Calibration Bit". In Section 20.5.2 "EEFC Flash Command Register", changed the description of FARG field accordingly. Replaced NVIC by "interrupt controller" everywhere in the document. Section 23. "Cyclic Redundancy Check Calculation Unit (CRCCU)" Section 23.1 "Description": added sentence with information on CRCCU and data integrity check. Section 23.2 "Embedded Characteristics": removed bullet `Single AHB Master Interface'. Inserted two new bullets on data integrity check and background task. Added note. Modified access type of Section 23.7.7 "CRCCU DMA Interrupt Mask Register". Section 23.6.2 "Transfer Control Register": updated IEN bit description Section 23.6.3 "Transfer Reference Register": replaced "compared with that register" with "compared with this field" in REFCRC field description Updated bit descriptions in Section 23.7.2 "CRCCU DMA Enable Register" to Section 23.7.6 "CRCCU DMA Interrupt Disable Register", in Section 23.7.8 "CRCCU DMA Interrupt Status Register", in Section 23.7.9 "CRCCU Control Register" and in Section 23.7.12 "CRCCU Interrupt Enable Register" to Section 23.7.15 "CRCCU Interrupt Status Register". Section 27. "Peripheral DMA Controller (PDC)" Replaced "on- and/or off-chip" with "target" in Section 27.1 "Description"and Section 27.4.2 "Memory Pointers". Added last paragraph to Section 27.4.1 "Configuration" specifying that the peripheral clock must be enabled for a PDC transfer. Section 28. "Clock Generator" Added Section 28.5.5 "Switching Main Clock between the Main RC Oscillator and Fast Crystal Oscillator". Section 29. "Power Management Controller (PMC)" Reworked Section 29.11 "Fast Startup" and added Section 29.12 "Start-up from Embedded Flash" Reworked Section 29.13 "Main Clock Failure Detector". Enhanced Section 29.14 "Programming Sequence" Enhanced Section 29.14 "Programming Sequence" Section 29.16 "Register Write Protection": Changed section title and re-worked content. In Section 29.17.21 "PMC Write Protection Mode Register" and Section 29.17.25 "PMC Peripheral Clock Status Register 1": Changed register names and modified bit and field descriptions. Section 30. "Chip Identifier (CHIPID)" Section 30.3.1 "Chip ID Register": Modified "ARCH: Architecture Identifier" bit description table to show only SAM4S. Section 31. "Parallel Input/Output Controller (PIO)" Section 31.5.14 "Register Write Protection": Changed section title and revised content. Section 31.7.46 "PIO Write Protection Mode Register": Modified register name and aligned bit descriptions. Replaced list of protectable registers with cross-reference to section "Register Write Protection". Section 31.7.47 "PIO Write Protection Status Register": Modified register name and aligned bit descriptions. Removed note. 1248 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-6. Doc. Date SAM4S Datasheet Rev. 11100F 29-Jan-14 Revision History (Continued) Changes Section 33. "Serial Peripheral Interface (SPI)" `MCK' replaced with `peripheral clock' throughout. Updated Figure 33-1 "Block Diagram", Figure 33-3 "SPI Transfer Format (NCPHA = 1, 8 bits per transfer)" and Figure 33-4 "SPI Transfer Format (NCPHA = 0, 8 bits per transfer)" Modified Section 33.7.3 "Master Mode Operations", Modified Section 33.7.5 "Register Write Protection", Section 33.8.10 "SPI Write Protection Mode Register" and Section 33.8.11 "SPI Write Protection Status Register" MCK replaced with peripheral clock Section 34. "Two-wire Interface (TWI)" Section 34.2 "Embedded Characteristics"; removed bullet "Next Buffer Support" Added details on master/slave mode configuration in Step 2 and fixed typos (`TXDIS' --> `TXTDIS', `RXDIS' --> `RXTDIS'), added commands 6-9 in Section 34.8.7.1 "Data Transmit with the PDC" on page 724 and and commands 4 and 12 in Section 34.8.7.2 "Data Receive with the PDC" on page 724. Updated Figure 34-27 "Master Performs a General Call". Corrected TWI_THR to Write-only access in Table 34-7 "Register Mapping" and Section 34.11.11 "TWI Transmit Holding Register" Added Section 34.10.6 "Using the Peripheral DMA Controller (PDC) in Slave Mode" Section 34.11.6 "TWI Status Register", updated the description of "NACK: Not Acknowledged (clear on read)", used in master mode Section 35. "Universal Asynchronous Receiver Transmitter (UART)" Corrected the offset for PDC registers in Section 35.6 "Universal Asynchronous Receiver Transmitter (UART) User Interface". Section 36. "Universal Synchronous Asynchronous Receiver Transceiver (USART)" Table 36-2 "I/O Line Description": corrected RXD type from Input to I/O. Added a paragraph on IRDA_FILTER programming criteria in Section 36.7.5.3 "IrDA Demodulator" and in the corresponding bitfield description in Section 36.8.20 "USART IrDA FILTER Register". Corrected Figure 36-22 "Parity Error" for stop bit value. Replaced 33400 baudrate with 38400 in Table 36-10, "Maximum Timeguard Length Depending on Baud Rate," on page 792, Table 36-11, "Maximum Time-out Period," on page 793. Section 36.7.10 "Register Write Protection": Changed section title and re-worked content. Section 36.8.22 "USART Write Protection Mode Register" and Section 36.8.23 "USART Write Protection Status Register": Changed register names and modified bit and field descriptions. In Section 36.7.3.4 "Manchester Decoder", updated information on RXIDLEV bit in 4th paragraph. Section 36.8.3 "USART Mode Register": in table describing `PAR Parity Type' field, added value `5' and description. Section 36.8.18 "USART FI DI RATIO Register": modified FI_DI_RATIO field from 16 bits to 11 bits. In Section 36.8.21 "USART Manchester Configuration Register" added RXIDLEV as bit 31 and added bit description. Section 37. "Timer Counter (TC)" TIOA1 replaced with TIOB1 in Section 37.1 "Description"and added a note for ENETRG description in Section 37.7.3 "TC Channel Mode Register: Waveform Mode". Erroneous description of TCCLKS table, rows 0 to 4 reworked in Section 37.7.2 "TC Channel Mode Register: Capture Mode" and Section 37.7.3 "TC Channel Mode Register: Waveform Mode" Section 37.7.14 "TC Block Mode Register": corrected TC2XC2S field configuration values: value 2 is TIOA0 (was TIOA1); value 3 is TIOA1 (was TIOA2) Section 37.6.2 "16-bit Counter", Section 37.6.11.1 "WAVSEL = 00", Figure 37-9 "WAVSEL = 10 without Trigger", Figure 37-10 "WAVSEL = 10 with Trigger", Section 37.6.11.3 "WAVSEL = 01", and Figure 37-14 "WAVSEL = 11 with Trigger": replaced "0xFFFF" with "2n-1" in first paragraph (with "n" representing counter size) SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1249 Table 49-6. Doc. Date SAM4S Datasheet Rev. 11100F 29-Jan-14 Revision History (Continued) Changes Section 38. "High Speed MultiMedia Card Interface (HSMCI)" Changed PDCFBYTE to FBYTE in Section 9.6 "WRITE_SINGLE_BLOCK/WRITE_MULTIPLE_BLOCK Operation using DMA Controller" and in Section 9.8 "READ_SINGLE_BLOCK/READ_MULTIPLE_BLOCK Operation using DMA Controller". Section 38.13 "Register Write Protection": changed title (was "Write Protection Registers"); revised content In Section 38.14.2 "HSMCI Mode Register", PDCMODE bit description, corrected reference to MCI Mode Register to HSMCI Status Register. In Section 38.14.7 "HSMCI Block Register", BLKLEN bit description, removed sentence on its accessibility in HSMCI Mode Register. Section 38.14.17 "HSMCI Write Protection Mode Register": modified register name (was HSMCI Write Protect Mode Register); replaced list of protectable registers with cross-reference to section "Register Write Protection" Section 38.14.18 "HSMCI Write Protection Status Register": modified register name (was HSMCI Write Protect Status Register) and updated description Section 40. "USB Device Port (UDP)" Section 40.2 "Embedded Characteristics": replaced bullet "Integrated Pull-up on DP" with "Integrated Pull-up on DPP", added bullet "Integrated Pull-down on DDM" Section 40.6.3.6 "Entering in Suspend State": replaced "must drain less than 500uA" with "must drain no more than 2.5 mA" Section 40.6.3 "Controlling Device States": replaced "may not consume more than 500 A" with "must not consume more than 2.5 mA" Table 40-6 "Register Mapping": corrected reset values for for UDP-FDR0..Y. Updated note (1). Section 40.4.2 "Power Management": added detail on fast RC. Changed register names: Section 40.7.10 old: UDP Endpoint Control and Status Register (Control, Bulk Interrupt Endpoints), new: "UDP Endpoint Control and Status Register (CONTROL_BULK)" Section 40.7.11 old: UDP Endpoint Control and Status Register (Isochronous Endpoints), new: "UDP Endpoint Control and Status Register (ISOCHRONOUS)". Section 41. "Analog Comparator Controller (ACC)" Section 41.1 "Description" Updated section for clarity. Figure 41-1 "Analog Comparator Controller Block Diagram": Updated for clarity. Section 41.6 "Functional Description", Section 41.6.2 "Analog Settings" and Section 41.6.4 "Fault Mode": Updated for clarity. Replaced section "Write Protection System" with Section 41.6.5 "Register Write Protection". Updated Section 41.7.8 "ACC Write Protection Mode Register" and Section 41.7.9 "ACC Write Protection Status Register". Bit 0 name in Section 41.7.9 "ACC Write Protection Status Register" changed from WPROTERR to WPVS. Section 42. "Analog-to-Digital Converter (ADC)" Section 42.1 "Description": Added sentence: The last channel is internally connected by a temperature sensor. Section 42.2 "Embedded Characteristics": updated section with new characteristics Section 42.6.3 "Conversion Resolution": Modified content to limit information on 12-bit resolution. Section 42.6.14 "Register Write Protection": Reworked content. Section 42.7.3 "ADC Channel Sequence 1 Register" and Section 42.7.4 "ADC Channel Sequence 2 Register": modified max channel number to 15. Section 42.7.12 "ADC Interrupt Status Register": updated `ENDRX' and `RXBUFF' bit descriptions. Section 42.7.15 "ADC Compare Window Register": updated `LOWTHRES' and `HIGHTHRES' field descriptions. Section 42.7.20 "ADC Write Protection Mode Register" and Section 42.7.21 "ADC Write Protection Status Register": Modified register names (from Write Protect to Write Protection). Reworked field descriptions. 1250 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-6. Doc. Date SAM4S Datasheet Rev. 11100F 29-Jan-14 Revision History (Continued) Changes Section 43. "Digital-to-Analog Converter Controller (DACC)" Section 43.7.7 "DACC Interrupt Enable Register", Section 43.7.8 "DACC Interrupt Disable Register" and Section 43.7.9 "DACC Interrupt Mask Register": modified bit descriptions. Rework of all "refresh" related paragraphs, Section 43.7.3 "DACC Channel Enable Register" and Section 43.6.7 "DACC Timings". Modified description for "REFRESH: Automatic Refresh Period" field in Section 43.7.2 "DACC Mode Register". Re-worked Section 43.6.8 "Register Write Protection" and associated registers and bit/field descriptions in Section 43.7.12 "DACC Write Protection Mode Register" and Section 43.7.13 "DACC Write Protection Status Register". Section 44. "Electrical Characteristics" Added Section 44.2 "Recommended Operating Conditions". Section 44.4 "Power Consumption": Added power consumption values for SAM4S4/SAM4S2. Updated Section 44.4.1 "Backup Mode Current Consumption". Removed Supply Ripple Voltage parameter from Table 44-30, "3 to 20 MHz Crystal Oscillator Characteristics" Table 44-32 "XIN Clock Electrical Characteristics (In Bypass Mode)": Added CPARASTANDBY AND RPARASTANDBY parameters. Updated and re-worked Section 44.8 "12-bit ADC Characteristics": Updated Section 44.9 "12-bit DAC Characteristics". Removed Max Voltage Ripple parameter from Table 44-55, "Analog Power Supply Characteristics". Added Refresh Time to Table 44-56, "Channel Conversion Time and DAC Clock". In Section 44.12 "AC Characteristics" modified Table 44-64, "SPI Timings". Table 44-65, "SSC Timings" Table 44-66, "SMC Read Signals - NRD Controlled (READ_MODE = 1)" Table 44-68, "SMC Write Signals - NWE Controlled (WRITE_MODE = 1)" Table 44-69, "SMC Write Signals - NCS Controlled (WRITE_MODE = 0)" Table 44-70, "USART SPI Timings" Table 44-71 "Two-wire Serial Bus Requirements": Added parameter tBUF Section 44.12.9 "Embedded Flash Characteristics": modified Table 44-72, "Embedded Flash Wait State at 105C". Table 44-73, "AC Flash Characteristics": Full Chip Erase: Added values for 256 Kbytes and 128 Kbytes. Added new parameter Page Program Time. Section 45. "Mechanical Characteristics" Table 45-20 "64-ball WLCSP Package Dimensions (in mm)" Added body size for SAM4S4 for WLCSP64 package. Figure 45-8 "48-lead LQFP Package Drawing" and corresponding characteristics added. Figure 45-9 "48-lead QFN Package Drawing" and corresponding characteristics added. Section 48. "Errata" Added Section 48.3 "Errata SAM4S4/S2 Rev. A Parts". Section 47. "Ordering Information" Added information on carrier type availability. Updated Table 47-1 "Ordering Codes for SAM4S Devices". Added new ordering codes for SAM4S4 and SAM4S2 devices. SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1251 Table 49-7. SAM4S Datasheet Rev. 11100E 24-Jul-13 Revision History Doc. Rev. 11100E Comments Change Request Ref. Introduction Added WLCSP64 package in Section "Features", Table 1-1, "Configuration Summary for SAM4SD32/SD16/SA16/S16 Devices", added Figure 4-6 and Table 4-5, "SAM4S16/S8 64-ball WLCSP Pinout". 8620 Updated Section 5.6 "Low-power Modes". Added information on WFE. 9073 Added 2nd paragraph in Section 6.1 "General Purpose I/O Lines". 8992 RTC Added new bullet "Safety/security features" in Section 16.2 "Embedded Characteristics". 8544 Last sentence added in Section 16.5.3 "Alarm". 8900 Added note in Section 16.5.3 "Alarm", Section 16.6.5 "RTC Time Alarm Register" and Section 16.6.6 "RTC Calendar Alarm Register". 9027 Replaced values for temperature range with a generic term in Section 16.5.7 "RTC Accurate Clock Calibration". 9033 Block diagram centered for readability in Section 16.3 "Block Diagram". rfo PMC Section 28.4.2 "Slow Clock Crystal Oscillator", replaced "...in MOSCSEL bit of CKGR_MOR,..." with "...in XTALSEL bit of SUPC_CR,..." in the last phrase of the 3d paragraph. 9069 Section 28.4.2 "Slow Clock Crystal Oscillator", added references on the OSCSEL bit of PMC_SR in the 3d paragraph. rfo Register names in Clock Generator: Replaced "PLL_MCKR" with "PMC_MCKR" and "PLL_SR" with "PMC_SR" 8970 in Section 28.5.6 "Software Sequence to Detect the Presence of Fast Crystal" In Section 28.6.1 "Divider and Phase Lock Loop Programming", 3rd bullet, replaced PMC_IER with PMC_SR. 8963 Deleted previous 4th bullet (was useless sentence "Disable and then enable the PLL..."). In Figure 28-3 and Section 28.5.3 "3 to 20 MHz Crystal or Ceramic Resonator-based Oscillator" paragraph 5, replaced MOSCXTCNT with MOSCXTST. Added code example in step 1. of Section 29.14 "Programming Sequence". Corrected reset value of CKGR_MOR register in Table 29-3, "Register Mapping". Corrected value of PLLA(B)COUNT field description in Section 29.17.9 "PMC Clock Generator PLLA Register" and Section 29.17.10 "PMC Clock Generator PLLB Register". Added a note in Section 29.17.8 "PMC Clock Generator Main Clock Frequency Register" and reworked a paragraph in Section 28.5.2 "Fast RC Oscillator Clock Frequency Adjustment" 8447 8564 8853 Electrical Characteristics rfo Changed 85C temperatures with 105C in the whole chapter. Added read/write characteristics temperature information on Flash in Note (3), Table 44-3, "DC Characteristics" and Note (1), Table 44-73, "AC Flash Characteristics". Modified Section 44.4.1 "Backup Mode Current Consumption" and Table 44-9 to Table 44-23 with up-to-date current consumption values. rfo Updated Section 44.4.2.1 "Sleep Mode". Added Section 44.4.3.1 "SAM4S4/2 Active Power Consumption". rfo In Section 44.4.4 "Peripheral Power Consumption in Active Mode", updated Table 44-24, "Typical Power Consumption on VDDCORE (VDDIO = 3.3V, TA = 25C)" rfo Mechanical Characteristics 1252 Added Figure 45-6 and associated package dimensions and soldering tables for WLCSP64 package. 8620 Soldering tables updated in Section 45. "Mechanical Characteristics". rfo SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-7. SAM4S Datasheet Rev. 11100E 24-Jul-13 Revision History (Continued) Change Request Ref. Doc. Rev. 11100E Comments Ordering Information New ordering codes (105 C, reel conditioning, WLCSP package) added in Table 47-1, "Ordering Codes for SAM4S Devices". 8620, rfo Errata Added Section Issue: "Watchdog Not Stopped in Wait Mode" and Section Issue: "Unpredictable Behavior if BOD is Disabled, VDDCORE is Lost and VDDIO is Connected". 9075 Backpage ARMConnected(R) logo and corresponding text deleted. Table 49-8. rfo SAM4S Datasheet Rev. 11100D 15-Apr-13 Revision History Change Request Ref. Doc. Rev. 11100D Comments Introduction Deleted sleep mode for fast start-up in Section 5.8 "Fast Start-up". 8763 Added 32 kHz trimming features in Section "Features". rfo Notes added in Section 8.1.3.1 "Flash Overview", below Figure 8-3. Electrical Characteristics In Table 43-26, added 2 lines describing CPARASTANDBY and RPARASTANDBY parameters. 8614 In Table 43-62, Endurance line, deleted "Write/erase... @ 25C" and 100k value. 8850 In Table 43-62, added Write Page Mode values. 8860 Errata Deleted former Chapter 45 "SAM4S Series Errata" (was only a cross-reference to Engineering Samples Erratas), added a new detailed Section 48. "Errata". 8645 Backpage ARMPowered(R) logo replaced with ARMConnected(R) logo, corresponding text updated. rfo SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1253 Table 49-9. SAM4S Datasheet Rev. 11100C 09-Jan-13 Revision History Doc. Rev. 11100C Comments Change Request Ref. Introduction In Section 2. "Block Diagram", USB linked to Peripheral Bridge instead of AHB Bus Matrix in Figure 2-3, Figure 8386 2-4, Figure 3. and Figure 2-2. Reference to the LPM bit removed in the whole datasheet. 8392 Flash rails mentioned in Section 5.1 "Power Supplies". 8406 Section 9. "Real Time Event Management" created. 8439 WKUP[15:0] pins added on each block diagram in Section 2. "Block Diagram" and in Table 3-1, "Signal Description List". 8459 All diagrams updated with Real Time Events in Section 2. "Block Diagram". 8484 JTAG and PA7 pins details added in Section 6.2.1 "Serial Wire JTAG Debug Port (SWJ-DP) Pins". 8547 CORTEX Section 12.8.3 "Nested Vectored Interrupt Controller (NVIC) User Interface", offset information for NVIC register 8211 mapping updated in Table 12-31 "Nested Vectored Interrupt Controller (NVIC) Register Mapping". Section 12.9.1 "System Control Block (SCB) User Interface", deleted lines with MMFSR, BFSR, UFSR and updated the note in Table 12-32, "System Control Block (SCB) Register Mapping". Table 12-34 "System Timer (SYST) Register Mapping": table name updated (SysTick changed to SYST). Harmonized instructions code fonts in Section 12.6 "Cortex-M4 Instruction Set". Fixed various typos. 8343 RTT RTC 1Hz calibrated clock feature added in Section 15.1 "Description", Section 15.4 "Functional Description" and in RTT_MR register, see Section 15.5.1 "Real-time Timer Mode Register". RTC New bullet "Safety/security features" added in Section 16.2 "Embedded Characteristics". 8544 WDT Note added in Section 17.5.3 "Watchdog Timer Status Register". 8128 SUPC Offsets updated and SYSC_WPMR in Table 18-1 "System Controller Registers". Section 18.4.9 "System Controller Write Protection Mode Register" added. 8253 Force Wake Up Pin removed from Section 18.1 "Embedded Characteristics". 8263 In Section 18.3.3 "Core Voltage Regulator Control/Backup Low-power Mode", removed informations related to 8363, 8407 WFE and WFI, deleted reference to 1.8V for voltage regulator. Figure 18-1 Block Diagram updated. 8515 EEFC 1254 In Section 20.5.2 "EEFC Flash Command Register", table added in FCMD bitfield, details added in table in FARG bitfield. 8352 Note concerning bit number limitation added in Section 20.4.3.5 "GPNVM Bit". 8390 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-9. SAM4S Datasheet Rev. 11100C 09-Jan-13 Revision History (Continued) Change Request Ref. Doc. Rev. 11100C Comments CMCC Updated access condition from Write-only to Read-only in Section 22.5.4 "Cache Controller Status Register" and Section 22.5.10 "Cache Controller Monitor Status Register". Index bitfield size increased from 4 to 5 bits in Section 22.5.6 "Cache Controller Maintenance Register 1", bitfield description completed. 8373 "0xXX - 0xFC" offset replaced with "0x38 - 0xFC" in the last row in Table 22-1 "Register Mapping". In Figure 22- rfo 1, replaced "Cortex MPPB" with "APB Interface" in Block Diagram. CRCCU TRWIDTH bitfield description table completed in Section 23.6.2 "Transfer Control Register". 8303 Updated Section 23.1 "Description" and Section 23.5.2 "CRC Calculation Unit Operation". rfo PDC Offset data for Register Mapping updated in Table 27-1 "Register Mapping". 7976 "ABP bridge" changed to "APB bridge" in Section 27.1 "Description". rfo PMC Section 28.5.6 "Software Sequence to Detect the Presence of Fast Crystal" added. 8371 Updated CKGR_MOR register reset value to 0x0000_0008 in Section 29.17 "Power Management Controller (PMC) User Interface". 8448 CHIPID Section 30.3.1 "Chip ID Register", in ARCH bitfield description table, rows sharing SAM3/SAM4 names reconfigured with standalone rows for each name. Section 30.3.1 "Chip ID Register", in ARCH bitfield description table, various devices added or removed. 7730 7977, 8034, 8383 Section 30.3.1 "Chip ID Register", in SRAMSIZ bitfield description table, replaced 1K/1Kbyte with 192K/192Kbyte for value1. 8036 In Section 30.2 "Embedded Characteristics", updated Table 30-1 "SAM4S Chip ID Registers". rfo PIO DSIZE bit description updated in Section 31.7.49 "PIO Parallel Capture Mode Register". 7705 Section 31.4.2 "External Interrupt Lines" added. Section 31.4.4 "Interrupt Generation" updated. rfo SSC Removed Table 30-4 in Section 32.7.1.1 "Clock Divider". 7303 Last line (PDC register) updated in Table 32-5 "Register Mapping". 7971 Reworked tables and bitfield descriptions in Section 32.9.3 "SSC Receive Clock Mode Register", Section 32.9.4 "SSC Receive Frame Mode Register", Section 32.9.5 "SSC Transmit Clock Mode Register", Section 32.9.6 "SSC Transmit Frame Mode Register". 8466 SPI In Section 33.2 "Embedded Characteristics", added the 2 first bullets, deleted the previous last bullet. 8544 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1255 Table 49-9. SAM4S Datasheet Rev. 11100C 09-Jan-13 Revision History (Continued) Doc. Rev. 11100C Comments Change Request Ref. TWI NVIC and AIC changed to Interrupt Controller. Section 33.10.4.5 "PDC" removed. "This bit is only used in Master mode" removed from bitfields ENDRX, ENDTX, RXBUFF, and TXBUFE in Section 34.11.6 "TWI Status Register". Figure 34-23 updated: SVREAD = 1 and first occurrence of RXRDY = 1. 7844 7884 Removed "20" at the end of the 1st paragraph in Section 34.1 "Description". 7921 Table 34-7 "Register Mapping", replaced "0x100 - 0x124" with "0x100 - 0x128" and "Reserved for the PDC" with 7973 "Reserved for PDC registers" in the PDC line. Section 34.10.6 "Using the Peripheral DMA Controller (PDC) in Slave Mode" reworked. rfo UART Table 35-3 "Register Mapping", PDC registers info for register mapping updated. 7967 USART Section 36.7.1 "Baud Rate Generator", replaced "or 6" with "or 6 times lower" in the last phrase. rfo HSMCI Phrase "not only for Write operations now" removed from NOTBUSY bitfield descriptionI in Section 38.14.12 "HSMCI Status Register". 8394 replaced BCNT bitfield table with the corresponding description and updated Warning note in BCNT bitfield description in Section 38.14.7 "HSMCI Block Register". 8431 In Section 38.6.3 "Interrupt", replaced references to NVIC/AIC with "interrupt controller". rfo PWM Typo corrected in line Timer0 in Table 39-4 "Fault Inputs". 8438 Replaced `Main OSC' with `Main OSC (PMC)' in Table 39-4 "Fault Inputs". rfo UDP Pull-up' and `pull-down' spelling harmonized in the whole chapter. 7867 Added UDP_CSRx (ISOENDPT) alternate register in Section 40.7.11 "UDP Endpoint Control and Status Register (ISOCHRONOUS)". 8414 ADC Removed "...and EOC bit corresponding to the last converted channel" from the last phrase of the third paragraph in Section 42.6.4 "Conversion Results". 8357 TRANSFER value set to 2 in TRANSFER bitfield description in Section 42.7.2 "ADC Mode Register". 8462 Text amended in Section 42.1 "Description". rfo SLEEP and FWUP bitfield description texts in tables updated in Section 42.7.2 "ADC Mode Register". Electrical Characteristics Whole chapter reworked to add SAM4SD32/SD16/SA16 data, various values added or updated. rfo, 8435 Clext values changed in Table 44-30. 8391 Configurations A and B updated in Section 44.4.1 "Backup Mode Current Consumption". 8422 Mechanical Characteristics QFN64 package drawing and table updated in Figure 45-5. 1256 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 8529 . Table 49-10. SAM4S Datasheet Rev. 11100B 31-Jul-12 Revision History Change Request Ref. Doc. Rev. 11100B Comments Introduction 48 pins packages (SAM4S16A and SAM4S8A devices) removed. 8100 Write Protected Registers added in "Description" on page 1. 8213 Note related to EWP and EWPL commands added in Section 8.1.3.1 "Flash Overview" on page 38. 8225 References to WFE instructions replaced by relevant bits precise descriptions. 8275 Dual bank and cache memory mentioned in "Description" on page 1 and "Configuration Summary" on page 4. rfo Flash and SRAM memory sizes updated in "Description" on page 1 and "Configuration Summary" on page 4. 1 A instead of 3 in "Description" on page 1, Section 5.3 on page 27 and Section 5.6.1 on page 30. Table titles and sub-section titles updated with new devices. New block diagram added in Figure 2-2 on page 6. VFBGA100 package added: Figure 4-3 on page 17 and Table 4-3 on page 20 added. Reference to CortexM3 deleted and VDDIO value added in Section 5.6.1 "Backup Mode" on page 30. Entering Wait Mode process updated and current changed from 15 to 32 A in Section 5.6.2 on page 30. Added paragraph detailing mode selection with FLPM value in Section 5.6.3 on page 31. Values added and notes updated in Table 5-1 on page 32. Third paragraph frequency values updated in Section 6.1 on page 34. SRAM upper address changed to 0x20400000, and EFC1 added in Figure 7-1 on page 37. Note added in Section 8.1.3.1 "Flash Overview" on page 38. New devices features added in Section 8.1.1 "Internal SRAM" on page 38, Section 8.1.3.1 "Flash Overview" on page 38, Section 8.1.3.4 "Lock Regions" on page 42, Section 8.1.3.5 "Security Bit" on page 42, Section 8.1.3.11 "GPNVM Bits" on page 43. EEFC replaced by EEFC0 and EEFC1 in Table 11-1 on page 48. `Cortex M-4' changed for `Cortex-M4' in block diagrams: Figure 2-3 on page 7 and Figure 2-4 on page 8. rfo Section 5.6.4 "Low-power Mode Summary Table", updated the list of potential wake up sources for Sleep Mode rfo in Table 5-1 on page 32. Added references to S16 in the flash size description in Section 8.1.3.1 "Flash Overview". rfo Section 2. "Block Diagram", replaced "Time Counter B" by "Time Counter A" in Figure 2-3 on page 7. rfo Fixed the section structure for Section 5.6.3 "Sleep Mode". rfo CORTEX FPU related instructions deleted in Table 12-13 on page 87. 8252 Fonts style corrected for instructions code in the whole chapter. rfo Updated Figure 12-9 on page 97. rfo RSTC Updated for dual core. 8306 EXTRST field description updated in Section 14.5.1 "Reset Controller Control Register" on page 283. 8340 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1257 Table 49-10. SAM4S Datasheet Rev. 11100B 31-Jul-12 Revision History (Continued) Doc. Rev. 11100B Comments Change Request Ref. RTC In Section 16.6.2 "RTC Mode Register" on page 303, formulas associated with conditions HIGHPPM = 1 and HIGHPPM = 0 have been swapped, text has been clarified. 7950 In Section 16.5.7 "RTC Accurate Clock Calibration" on page 299, paragraph describing RTC clock calibration circuitry correction updated with mention of crystal drift. 7952 SUPC References to WFE instructions deleted in Section 18.3.3 "Core Voltage Regulator Control/Backup Low-power rfo Mode" on page 328. Supply monitor threshold values modified in Section 18.3.4 "Supply Monitor" on page 328. SMTH bit table replaced by a cross-reference to Electrical characteristics in Section 18.4.4 "Supply Controller Supply Monitor Mode Register" on page 338. Typo in Section 18.4.8 "Supply Controller Status Register" on page 343 is now fixed. 8024 "half" replaced with "first half" in Section 18.4.6 "Supply Controller Wake-up Mode Register" on page 340 and in 8067 Section 18.4.7.2 "Low Power Debouncer Inputs" on page 295. Figure 18-4 on page 331 modified. Push-to-Break figure example Figure 18-6 on page 333 added, title of Figure 18-5 on page 333 modified. 8064, 8082 "square waveform .." changed to "duty cycle .." in Section 18.4.7.2 "Low Power Debouncer Inputs" on page 295. 8082 Switching time of slow crystal oscillator updated in Section 18.3.2 "Slow Clock Generator" on page 328. 8266 8226 EEFC Added GPNVM command line in Section * "FARG: Flash Command Argument" on page 368. 8076 Unique identifier address changed in Section 20.4.3.8 "Unique Identifier" on page 363. 8274 User Signature address changed in Section 20.4.3.9 "User Signature" on page 363. Changed the System Controller base address from 0x400E0800 to 0x400E0A00 in Section 20.5 "Enhanced Embedded Flash Controller (EEFC) User Interface" on page 365. rfo FFPI All references, tables, figures related to 48-bit devices cleared in this whole chapter. rfo CMCC New chapter. CRCCU 7803 Typos: CCIT802 corrected to CCITT802, CCIT16 corrected to CCITT16 in Section 23.5.1 "CRC Calculation Unit" on page 399 and Section 23.7.10 "CRCCU Mode Register" on page 414. TRC_RC corrected to TR_CRC in Section 23.7.10 "CRCCU Mode Register" on page 414. SMC 1258 "turned out" changed to "switched to output mode" in Section 26.8.4 "Write Mode" on page 450. 7925 Removed DBW which is not required for 8-bit only in Section 26.15.4 "SMC MODE Register" on page 476. 8307 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Table 49-10. SAM4S Datasheet Rev. 11100B 31-Jul-12 Revision History (Continued) Change Request Ref. Doc. Rev. 11100B Comments PMC Added a note in Section 29.17.7 "PMC Clock Generator Main Oscillator Register" on page 528. 7848 Max MULA/MULB value changed from 2047 to 62 in Section 29.17.9 "PMC Clock Generator PLLA Register" on 8064 page 531 and Section 29.17.10 "PMC Clock Generator PLLB Register" on page 532. Step 5 in Section 28.2.13 "Programming Sequence" on page 463: Master Clock option added in CSS field. 8170 Third paragraph added in Section 28.2.12 "Main Crystal Clock Failure Detector" on page 462. WAITMODE bit added in Section 29.17.7 "PMC Clock Generator Main Oscillator Register" on page 528. 8208 CHIPID Table 30-1 on page 552 modified. rfo TC Changed TIOA1 in TIOB1 in Section 37.6.14.1 "Description" on page 860 and Section 37.6.14.4 "Position and 8101 Rotation Measurement" on page 865. PWM Font size enlarged in Figure 39-14 on page 964. 7910 "CMPS" replaced with "CMPM" in whole document. 8021 ADC EOCAL pin and description added in Section 42.7.12 "ADC Interrupt Status Register" on page 1106. rfo PDC register row added in Section 42.7 "Analog-to-Digital Converter (ADC) User Interface" on page 1092. 7969 Added comment in Section 42.7.15 "ADC Compare Window Register" on page 1109. 8045 Features added in Section 42.2 "Embedded Characteristics" on page 1077. 8088 Comments added, and removed "offset" in Section 42.6.11 "Automatic Calibration" on page 1090. 8133 Electrical Characteristics Whole chapter updated. In tables, values updated, and missing values added. 8085, 8245 Comment for flash erasing added in Section 44.12.9 "Embedded Flash Characteristics" on page 1199. 8223 Updated conditions for VLINE-TR and VLOAD-TR in Table 44-4 on page 1143. rfo Removed the "ADVREF Current" row from Table 43-30 on page 1059. rfo Updated the "Offset Error" parameter description in Table 43-32 on page 1061. Updated the TACCURACY parameter description in Table 44-6 on page 1144. Updated the temperature sensor description in Section 44.11 "Temperature Sensor" on page 1180 and the slope accuracy parameter data in Table 44-60 on page 1180. rfo Mechanical Characteristics 48 pins packages (SAM4S16A and SAM4S8A devices) removed. 8100 100-ball VFBGA package drawing added in Figure 45-3 on page 1203. rfo Ordering Information Table 47-1 on page 1216 completed with new devices and reordered. rfo Errata rfo Removed the Flash Memory section. Removed the Errata section and added references for two separate errata documents in Section 47. "Ordering rfo Information" on page 1216. Specified the preliminary status of the datasheet. rfo SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1259 Table 49-11. SAM4S Datasheet Rev. 11100A 28-Oct-11 Revision History Doc. Rev. 11100A Comments First issue. 1260 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 Change Request Ref. Table of Contents Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Safety Features Highlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Configuration Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3. Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4. Package and Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1 4.2 4.3 5. Power Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 6. 100-lead Packages and Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 64-lead Packages and Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 48-lead Packages and Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power-up Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Typical Powering Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Active Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low-power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wake-up Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fast Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 27 28 29 30 30 33 33 Input/Output Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.1 6.2 6.3 6.4 6.5 6.6 General Purpose I/O Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System I/O Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NRST Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ERASE Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-tamper Pins/Low-power Tamper Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 36 37 37 37 37 7. Product Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 8. Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 8.1 8.2 9. Embedded Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 External Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Real Time Event Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 9.1 9.2 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Real Time Event Mapping List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 10. System Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 10.1 10.2 System Controller and Peripheral Mapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Power-on-Reset, Brownout and Supply Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 11. Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 11.1 11.2 Peripheral Identifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Peripheral Signal Multiplexing on I/O Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1261 12. ARM Cortex-M4 Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 12.1 12.2 12.3 12.4 12.5 12.6 12.7 12.8 12.9 12.10 12.11 12.12 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Cortex-M4 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Cortex-M4 Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Cortex-M4 Core Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 Nested Vectored Interrupt Controller (NVIC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 System Control Block (SCB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 System Timer (SysTick) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233 Memory Protection Unit (MPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262 13. Debug and Test Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 13.1 13.2 13.3 13.4 13.5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Debug and Test Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 267 268 269 270 14. Reset Controller (RSTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275 14.1 14.2 14.3 14.4 14.5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reset Controller (RSTC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275 275 275 276 281 15. Real-time Timer (RTT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285 15.1 15.2 15.3 15.4 15.5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Real-time Timer (RTT) User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285 285 285 286 288 16. Real-time Clock (RTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293 16.1 16.2 16.3 16.4 16.5 16.6 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Real-time Clock (RTC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293 293 294 294 294 302 17. Watchdog Timer (WDT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319 17.1 17.2 17.3 17.4 17.5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Watchdog Timer (WDT) User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319 319 320 321 323 18. Supply Controller (SUPC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 18.1 1262 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 18.2 18.3 18.4 18.5 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supply Controller (SUPC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 329 330 339 19. General Purpose Backup Registers (GPBR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349 19.1 19.2 19.3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349 General Purpose Backup Registers (GPBR) User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 20. Enhanced Embedded Flash Controller (EEFC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352 20.1 20.2 20.3 20.4 20.5 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enhanced Embedded Flash Controller (EEFC) User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . 352 352 352 353 370 21. Fast Flash Programming Interface (FFPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 21.1 21.2 21.3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 Parallel Fast Flash Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 22. Cortex-M Cache Controller (CMCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 22.1 22.2 22.3 22.4 22.5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cortex-M Cache Controller (CMCC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 385 386 386 388 23. Cyclic Redundancy Check Calculation Unit (CRCCU) . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 23.1 23.2 23.3 23.4 23.5 23.6 23.7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 CRCCU Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401 Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 CRCCU Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403 Transfer Control Registers Memory Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404 Cyclic Redundancy Check Calculation Unit (CRCCU) User Interface . . . . . . . . . . . . . . . . . . . . . . 408 24. Boot Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424 24.1 24.2 24.3 24.4 24.5 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hardware and Software Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Device Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAM-BA Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424 424 424 425 426 25. Bus Matrix (MATRIX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430 25.1 25.2 25.3 25.4 25.5 25.6 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Master/Slave Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Memory Mapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Special Bus Granting Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System I/O Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430 430 431 431 432 433 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1263 25.7 25.8 Register Write Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434 Bus Matrix (MATRIX) (MATRIX) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435 26. Static Memory Controller (SMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443 26.1 26.2 26.3 26.4 26.5 26.6 26.7 26.8 26.9 26.10 26.11 26.12 26.13 26.14 26.15 26.16 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O Lines Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multiplexed Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Memory Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Connection to External Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard Read and Write Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Scrambling/Unscrambling Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic Wait States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data Float Wait States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Wait . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slow Clock Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Asynchronous Page Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Static Memory Controller (SMC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443 443 444 444 445 446 446 448 450 459 459 464 468 474 476 479 27. Peripheral DMA Controller (PDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 490 27.1 27.2 27.3 27.4 27.5 27.6 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peripheral DMA Controller Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peripheral DMA Controller (PDC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 490 490 491 492 493 495 28. Clock Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506 28.1 28.2 28.3 28.4 28.5 28.6 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slow Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Divider and PLL Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506 506 507 508 509 513 29. Power Management Controller (PMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515 29.1 29.2 29.3 29.4 29.5 29.6 29.7 29.8 29.9 29.10 29.11 29.12 29.13 29.14 1264 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Master Clock Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Processor Clock Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SysTick Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . USB Clock Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peripheral Clock Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Free-Running Processor Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Programmable Clock Output Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fast Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Startup from Embedded Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main Clock Failure Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Programming Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 515 515 516 516 517 517 517 518 518 518 518 520 520 522 29.15 Clock Switching Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525 29.16 Register Write Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528 29.17 Power Management Controller (PMC) User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529 30. Chip Identifier (CHIPID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560 30.1 30.2 30.3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 561 Chip Identifier (CHIPID) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 562 31. Parallel Input/Output Controller (PIO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567 31.1 31.2 31.3 31.4 31.5 31.6 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 571 Parallel Input/Output Controller (PIO) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585 32. Synchronous Serial Controller (SSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642 32.1 32.2 32.3 32.4 32.5 32.6 32.7 32.8 32.9 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643 Application Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643 SSC Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644 Pin Name List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645 Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647 Synchronous Serial Controller (SSC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659 33. Serial Peripheral Interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 686 33.1 33.2 33.3 33.4 33.5 33.6 33.7 33.8 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Serial Peripheral Interface (SPI) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 686 687 688 688 689 689 691 704 34. Two-wire Interface (TWI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 719 34.1 34.2 34.3 34.4 34.5 34.6 34.7 34.8 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O Lines Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Two-wire Interface (TWI) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 719 719 720 720 720 721 721 746 35. Universal Asynchronous Receiver Transmitter (UART) . . . . . . . . . . . . . . . . . . . . . . . . . 761 35.1 35.2 35.3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 761 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 761 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 761 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1265 35.4 35.5 35.6 Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 762 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 762 Universal Asynchronous Receiver Transmitter (UART) User Interface . . . . . . . . . . . . . . . . . . . . . 768 36. Universal Synchronous Asynchronous Receiver Transceiver (USART) . . . . . . . . . 779 36.1 36.2 36.3 36.4 36.5 36.6 36.7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 779 Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 779 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 781 I/O Lines Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 781 Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 782 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 783 Universal Synchronous Asynchronous Receiver Transmitter (USART) User Interface . . . . . . . . . 814 37. Timer Counter (TC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 851 37.1 37.2 37.3 37.4 37.5 37.6 37.7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Timer Counter (TC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 851 851 852 853 853 854 875 38. High Speed Multimedia Card Interface (HSMCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 905 38.1 38.2 38.3 38.4 38.5 38.6 38.7 38.8 38.9 38.10 38.11 38.12 38.13 38.14 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin Name List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bus Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Speed MultiMedia Card Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SD/SDIO Card Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CE-ATA Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HSMCI Boot Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HSMCI Transfer Done Timings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Register Write Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Speed MultiMedia Card Interface (HSMCI) User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . 905 905 906 907 907 908 908 911 918 919 920 921 923 924 39. Pulse Width Modulation Controller (PWM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 952 39.1 39.2 39.3 39.4 39.5 39.6 39.7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O Lines Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pulse Width Modulation Controller (PWM) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 952 953 954 954 954 957 980 40. USB Device Port (UDP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1028 40.1 40.2 40.3 40.4 1266 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1028 1028 1029 1030 40.5 40.6 40.7 Typical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1030 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1032 USB Device Port (UDP) User Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1045 41. Analog Comparator Controller (ACC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1069 41.1 41.2 41.3 41.4 41.5 41.6 41.7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin Name List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analog Comparator Controller (ACC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1069 1069 1069 1070 1070 1071 1072 42. Analog-to-Digital Converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1083 42.1 42.2 42.3 42.4 42.5 42.6 42.7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analog-to-Digital (ADC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1083 1084 1085 1085 1086 1087 1097 43. Digital-to-Analog Converter Controller (DACC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1121 43.1 43.2 43.3 43.4 43.5 43.6 43.7 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Embedded Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Dependencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital-to-Analog Converter Controller (DACC) User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 1121 1121 1122 1122 1122 1124 1126 44. Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1142 44.1 44.2 44.3 44.4 44.5 44.6 44.7 44.8 44.9 44.10 44.11 44.12 Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oscillator Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PLLA, PLLB Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . USB Transceiver Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-bit ADC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-bit DAC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analog Comparator Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1142 1142 1143 1149 1163 1169 1170 1172 1181 1183 1183 1184 45. Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1204 45.1 45.2 45.3 45.4 45.5 45.6 100-lead LQFP Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100-ball TFBGA Mechanical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100-ball VFBGA Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64-lead LQFP Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64-lead QFN Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64-ball WLCSP Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1204 1205 1206 1208 1210 1211 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 1267 45.7 45.8 45.9 45.10 48-lead LQFP Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48-lead QFN Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Soldering Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Packaging Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1214 1216 1217 1217 46. Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1218 47. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1219 48. Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1223 48.1 48.2 48.3 48.4 Errata SAM4SD32/SD16/SA16/S16/S8 Rev. A Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Errata SAM4SD32/SD16/SA16/S16/S8 Rev. B Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Errata SAM4S4/S2 Rev. A Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Errata SAM4S4/S2 Rev. B Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1223 1226 1229 1231 49. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1233 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1261 1268 SAM4S Series [DATASHEET] Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15 ARM Connected Logo XXXXXX Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com (c) 2015 Atmel Corporation. / Rev.: Atmel-11100K-ATARM-SAM4S-Datasheet_09-Jun-15. Atmel(R), Atmel logo and combinations thereof, Enabling Unlimited Possibilities(R), and others are registered trademarks or trademarks of Atmel Corporation in U.S. and other countries. ARM(R), ARM Connected(R) logo, and others are the registered trademarks or trademarks of ARM Ltd. Windows(R) is a registered trademark of Microsoft Corporation in U.S. and/or other countries. Other terms and product names may be trademarks of others. DISCLAIMER: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. SAFETY-CRITICAL, MILITARY, AND AUTOMOTIVE APPLICATIONS DISCLAIMER: Atmel products are not designed for and will not be used in connection with any applications where the failure of such products would reasonably be expected to result in significant personal injury or death ("Safety-Critical Applications") without an Atmel officer's specific written consent. Safety-Critical Applications include, without limitation, life support devices and systems, equipment or systems for the operation of nuclear facilities and weapons systems. Atmel products are not designed nor intended for use in military or aerospace applications or environments unless specifically designated by Atmel as military-grade. Atmel products are not designed nor intended for use in automotive applications unless specifically designated by Atmel as automotive-grade.