AT91SAM3U-SK - EMBEST

1/13

www.embedinfo.com/en

Embest AT91SAM3U ARM-CM3 Board

User Guide

EMBEST CO., LIMITED

Address: Room 509, Luohu Science & Technology Building,

No.85, Taining Road, Shenzhen, Guangdong, China 518020

Telephone: 0086-755-25621715 or 25635626 ext.1715

Fax: 0086-755-25616057

Sales Email: sales.en@embedinfo.com

Support Email: support.en@embedinfo.com

Website: http://www.embedinfo.com/en

2/13

www.embedinfo.com/en

AT91SAM3U4E Chips Based on Atmel ARM Cortex-M3 Kernel

The AT91SAM3U ARM-CM3 Boar d is an ARM embedded evaluation board produced by

Embest, integrates the ATMEL Cortex-M3 core-based processor AT91SAM3U4E, operating at

84 MHz frequency , with internal 256KB flash, 48KB SRAM. The board features USB, I2C, MCI

interface, TFT-LCD, USART interface, 96 I/O port, EBI support SRAM/NOR/NAND memory,

etc. Plenty of software examples, which can be used in Keil MDK environment, are

accompanied in CDROM.

Deliverables

The AT91SAM3U ARM-CM3 toolkit contains the following items:

y a AT91SAM3U ARM-CM3 Board

y power supply

y universal input AC/DC power supply with US, Europe and UK plug adapters

y one 3V Lithium Battery type CR1225

y one USB cable

y one serial RS232 cable

3/13

www.embedinfo.com/en

Content

1. Jumper................................................................................................................................... 4

2. Evaluation Board Hardware................................................................................................ 5

2.1 Board Overview........................................................................................................................................5

2.2 Block Diagram..........................................................................................................................................6

2.3 Processor ...................................................................................................................................................6

2.4 Memory.....................................................................................................................................................6

2.5 Clock Circuitry.........................................................................................................................................6

2.6 Reset and Wake-Up Circuitry.................................................................................................................7

2.7 Power Supply and Management .............................................................................................................7

2.8 UART.........................................................................................................................................................7

2.9 USART ......................................................................................................................................................7

2.10 LED..........................................................................................................................................................8

2.11 LCD Backlight Control and Touch Panel.............................................................................................8

2.12 JTAG .......................................................................................................................................................8

2.13 Audio Codec............................................................................................................................................9

2.14 USB..........................................................................................................................................................9

2.15 ADC .........................................................................................................................................................9

2.16 User Buttons..........................................................................................................................................10

2.17 Temperatur e Sensor .............................................................................................................................10

2.18 SD Card.................................................................................................................................................10

2.19 PIO Expansion......................................................................................................................................10

2.20 Hardware Testing.................................................................................................................................11

4/13

www.embedinfo.com/en

1. Jumper

The AT91SAM3U ARM-CM3 Board jumpers are used for many purposes such as internal

Flash Memory re-initialization, power current measurement and other configurations.

Table 1. Jumpers Setting

Designation Label Default Setting

Feature

JP1 ERASE

Open Close it to reinitialize the Flash content and

some of its NVM bits. This jumper must be

closed for more than 220 ms at power-up to

perform the re-initialization.

JP2(DNP) TEST Not populated

(open) reserved

JP3 VIN Close Measure current feed into VDDIN pin

JP5 AD12B

VREF Pin1 Pin2 close,

Switch to +3V3

Select the reference voltage of the 12-bit ADC

to be either 3.3V (close 1-2) or 2.5V (close 2-3)

JP6 VIO Close Measure current feed into VDDIO pins

JP7 VUTMI

Close Measure current feed into VDDUTMI pin

JP8 VANA Close Measure current feed into VDDANA pin

JP9 VCORE

Close Measure current feed into VDDCORE pins

JP10 VPLL Close Measure current feed into VDDPLL pin

JP11 VOUT Close Measure current out of VDDOUT pin

JP12 NCS0 Close Disconnection possibility on NCS0

JP13 NCS1 Close Disconnection possibility on NCS1

JP14 NCS2 Close Disconnection possibility on NCS2

JP15 3AXS Open G-select feature, sensitivity level switch.

Close as 440mv/g, open as 117.5mV/g

JP16 3AXS Open Close to cause a slight deflect on each axis

output, which is device self test

JP17 FORCE

POWER

Open Close to force +3V3 LDO output valid

JP18(DNP) Not populated

(open) Close to enable 50-Ohm terminal resistor for

AD12BAD3 BNC port

JP19(DNP) Not populated

(open) Close to enable 50-Ohm terminal resistor for

AD0 BNC port

JP20 ADVRE

F Pin1 Pin2 close,

Switch to +3V3

Select the reference voltage of the 10-bit ADC

to be either 3.3V (close 1-2) or 2.5V (close 2-3)

JP21 Open Measure current feed into ZigBee module

5/13

www.embedinfo.com/en

2. Evaluation Board Hardware

2.1 Board Overview

Table 2. A List of Hardware Interfaces

J1 External Clock Input Connector

J2 LCD connector

J3 UART DB9 male connector

J4 USART DB9 male connector

J5 HEADPHONE LINE-OUT

J6 Audio LINE-IN

J7 MONO/STEREO MICRO INPUT

J8 SD/MMC Socket

J9 USB Device(B-type) interface

J10 JTAG interface

J11 Power JACK

J12 SAM3U LOFP144

J13 PIOC external pins

J14 PIOB external pins

J15 PIOA external pins

J16 ZigBee

CN1 BNC interface1 supporting ADC12B

CN2 BNC interface2 supporting ADC0

MN1 SAM3 chip

MN2 PSRAM

MN3 NAND Flash

MN4 AAT3194 charge pump DC / DC converters

MN5 Touch Screen controller

MN6 RS232 Transceiver 1

MN7 RS232 Transceiver 2

MN8 WM8731 CODEC

MN9 G-Sensor

MN10 Temperature Sensor

MN11 USB Slave Device interface

MN12 Voltage Regulator

MN13 PolyZen diode

MN14 LC combinatory filter

MN15 LM4040-2.5 PNP

BP1 NRST button

BP2 NRSTB button

BP3 FWUP button

BP4 USR-LEFT button

BP5 USR-RIGHT button

6/13

www.embedinfo.com/en

2.2 Block Diagram

2.3 Processor

The Embest AT91SAM3U ARM-CM3 Board is equipped with a SAM3U4E processor in

LQFP144 package.

2.4 Memory

The SAM3U4E chip embeds:

y 256 KB of embedded Flash

y 48 KB of embedded SRAM with dual bank

y 16 KB of ROM with embedded boot loader routines (UART, USB) and IAP (In-Application

Programming functions) routines.

The SAM3U4E features an Externa l Bus Interface (EBI) which permits connecting to a wide

range of external memories and peripherals. The Embest AT91SAM3U board is equipped

with two kinds of memory devices connected to the SAM3U4E EBI:

y One PSRAM (Micron MT45V512KW16PEGA 512K*16, 48-ball VFBGA), 16 bits data

interface

y One NAND-Flash MT29F2G16ABD.

2.5 Clock Circuitry

The clock generator of a SAM3U4E microcontroller is made of:

y A Low Power 32,768 Hz Slow Clock Oscillator with bypass mode

y A 3 to 20 MHz Crystal Oscillator, which can be bypassed (12 MHz needed in case of

connecting to USB interface)

y A factory programmed fast internal RC Oscillator. 3 output frequencies can be selected: 4,

8 or 12 MHz (default value is 4 MHz).

7/13

www.embedinfo.com/en

y A 480 MHz UTMI PLL providing a clock for the USB High Speed Device Controller

y A programmable PLL r anging from 96 to 192 MHz (input from 8 to 16 MHz), is capable of

providing the clock MCK to the processor and to the peripherals.

The Embest AT91SAM3U board is equipped with one 12 MHz crystal, one 32,768 Hz crystal

and an external clock input connector (optional, not populated by default).

2.6 Reset and Wake-Up Circuitry

The on-board NRST button BP1 and NRSTB button BP2 provide the SAM3U4E with external

reset control. The on-board W AKE-UP button BP3 can be used to w ake up the chip from low

power modes.

2.7 Power Supply and Management

The Embest AT91SAM3U board is supplied with an external 5V DC block through input J11.

Protection circuitry is obtained by a PolyZen diode MN13 and an LC combinatory filter MN14.

The adjustable LDO regulator MN12 enables the voltage v alue to stable around 3.5V and it

powers for all the 3.3V on-board components. The shut down control of this LDO is made of

MOSFETs Q1, Q2 and is guided by the SAM3U4E SHDN pin. When SAM3U4E is in backup

mode, SHDN pin will output a low level signal to shut down the LDO; when it is in the

running mode (not in backup mode), SHDN pin will output a high level signal to run the LDO.

When closing the “FORCE POWER ON” jumper JP17, the P-channel MOSFET Q1 will be forced

on, and the LDO 3.3V will also be forced to output, no matter what level the SHDN Pin input.

2.8 UART

The Universal Asynchronous Receiver features a two-pin UART that can be used for

communication and trace purposes. It offers an ideal channel for in-situ programming

solutions. This UART is associated with two PDC channels to reduce the process time on

packet handling.

This two-pin UAR T (TXD and RXD only) is buffered through an RS232 Transceiver MN6 and

brought the result to the DB9 male connector J3.

2.9 USART

The Universal Synchronous/Asynchronous Receiver Transmitter (USART ) provides one full

duplex universal synchronous/asynchronous link circuit. The data frame is extensively

configurable (such as data, data length, parity check and some stop bits, etc) to support a

broad range of serial communication standards. The USART is also associated with PDC

channels for TX/RX data access.

There are 3 USAR T on the Embest AT91SAM3U board. The board connects the USAR T1 bus

(including TXD, RXD, RTS, and CTS handshake signals control) to the DB9 male connector

8/13

www.embedinfo.com/en

J4 through the RS232 Transceiver MN7.

2.10 LED

There are three LEDs on the Embest AT91SAM3U board:

D2 and D3 green LEDs are user-defined and controlled by the GPIO.

D4 red LED is a power LED indicating the voltage v alue i s 3.3V. It can also be controlled by

the GPIO (by default, the GPIO is disabled and the LED is lighted by an on-board 3.3V

voltage).

2.11 LCD Backlight Control and Touch Panel

The Embest AT91SAM3U board carries one TFT-LCD module with touch screen -

FTM280C12D which integrates the complete driver IC HX8347. The LCD display’s size is 2.8

inches, with the resolution of 240 x 320 pixels.

Table3. LCD Module Pin Output

Pin Symbol Function Pin Symbol

Function

1 GND Ground 27 Y+ Touch panel Y_UP

2 CS Chip Select 28 X- Touch panel Y _LEFT

3 RS Register select signal 29 Y- Touch panel Y_DOWN

4 WR Write operation signal 30 GND Ground

5 RD Read operation signal 31 VDD1 Power supply for digital IO Pad

6~21 DB0~DB15 Data bus 32 VDD2 Power supply for analog circuit

22~23 NC No connection 33~36 A1~A4 Power supply for backlight

24 RESET Reset signal 37~38 NC No connection

25 GND Ground 39 K Backlight ground

26 X+ Touch panel Y_RIGH T

The LCD is reset through NRST, and JTAG interface and BP1 also use NRST. The LCD’s chip selection pin

connects to NCS2. SAM3U4E communicates with LCD through PIOB port, which complies with 16-bit parallel

“8080-like” bus protocol.

The backlight of the LCD consists of 4 LEDs, its driver is AAT3194 (MN4). AAT3194 which is able to open,

close and configure the brightness of the LED connects to SAM3U4E through S2C.

The LCD Unit integrates 4-wire touch screen which is controlled by ADS7843 (MN5), it is a slave device of

SAM3U4E SPI bus. The IN3/IN4 pin of ADS7843 is used to extend the extra functions.

2.12 JTAG

The standard 20-pin JTAG connector of the board is able to connect to any ARM JTAG

emulator, such as SAM-ICE.

9/13

www.embedinfo.com/en

2.13 Audio Codec

The Embest AT91SAM3U board includes a audio codec WM8731 for digital sound input and

output. The function of the audio jacks is as follows:

y microphone input

y line audio input

y headphone output

The SAM3U4E programmable clock output is used to generate the WM8731 master clock

(MCLK). The SAM3U4E ODT (On-Die Termination) feature guarantees a signal integrity on

this clock line without the need for external discrete components.

WM8731 pin 21 MODE is pulled down by default; this configures the device as a TWI device

for internal register access.Pin15 CSB is pulled up, which sets its TWI address as 33

[0x0011011].

The WM8731 digital interface works in slave mode on the SAM3U4E Synchronous Serial

Controller (SSC) interface, which means that Codec digital audio bit clock and ADC/DAC

left/right control clock are to be generated by the SAM3U4E.

Figure1. Codec Slave Mode

2.14 USB

The SAM3U4E UDPHS port is compliant with the Universal Serial Bus (USB) rev 2.0 High

Speed device specification. J9 is a B-type receptacle for USB device.

Both R2 and R3 39-Ohm resistors build up a 90-Ohm differential impedance together with

a 5-Ohm output impedance of the Hi-speed channel drivers.

R68 and R69 build up a divider circuit, makes the voltage value reduce from5V to

3.3Vimplement plug-in detection (5V level gets lowered to a PIO compatible 3.3V, it

implements the detect function through PA0.

Note: PA0 is also shared with ZigBee signal IRQ0.

2.15 ADC

There are 8 multiplexed analog input channels on the 12-bit ADC, as well as the 10-bit ADC.

The board optionally connects the two ADC channels to BNC header: one is 12-bit ADC

channel 3, the other is 10-bit ADC channel 0.

A potentiometer is also connected to these two channels to implement an easy access to

ADC programming and debugging (or implement an analog user control such as display

10/13

www.embedinfo.com/en

brightness, volume, etc.).

Note: In the case of default setting, both AD12BAD3 and AD0 connect to the potentiometer,

thus, AD12BAD3 and AD0 are actually like being connected together. If these two ports

need to work separately, R82 and/or R84 should be removed.

Figure2. ADC Input

2.16 User Buttons

The board has two user buttons which connect to PIO lines, they are defined as left and right

buttons by default.

2.17 Temperature Sensor

A temperature sensor MCP9800 is connected to the SAM3U4E TWI bus. This device also

features an open-drain output ALERT pin and outputs an alert signal when the ambient

temperature goes beyond the user-programmed temperature limit.

Note that the 0-Ohm resistors R15 and R16 have been implemented to offer a disconnection

possibility (freeing these dedicated PIO lines for other custom usage).

2.18 SD Card

The board has an MMC/MMCPlus high-speed 8-bit multimedia interface. This interface is

used as a 4/8-bit interface, connected to an 8-bit SD/MMC card slot to do card detection.

2.19 PIO Expansion

The SAM3U4E product features 3 PIO controllers: PIOA, PIOB and PIOC, which multiplex the

I/O lines of the peripheral set. Each PIO controller controls up to 32 PIO lines. Expansion

ports J13, J14, J15 provide a way for customers to define any PIO channels.

All the expansion port pins are directly connected to the SAM3U4E chip, except PB4 and PB5,

which are assigned as AD12BAD3 and AD0 by default on the board. Solder drops have been

implemented on the board to avo id signal conflicts from tr aces rout ing to expa nsion ports.

If PB4 and PB5 need to be connected to the J14 connector, solder drops SD3 and SD4 should

be shorted.

11/13

www.embedinfo.com/en

2.20 Hardware Testing

Table4. Routine Introduction of Embest AT91SAM3U Evaluation Board

Experiment Name Function Description

NVIC Turn on LED lights according pushing USR-LEFT of

USR-RIGHT button.

DMA DMA transfers data from memory to memory working on

Link List Mode.

PDC In this experiment, PDC module (peripheral DMA

controller) obtains serial data from DBGU, stored in the

data array, and finally displayed.

USART Send a message using USART. Display them through PC

HyperTerminal.

You can also send data or files according PC

HyperTerminal. USART can receive them, display the

transfer size per second and total transfer size.

PWR You can control board working in four different power

modes (Sleep Mode, Active Mode, Wait Mode, Backup

Mode) by pressing different keys according PC

HyperTerminal. You can also wakeup it by pushing

USR-LEFT button when it working in SLEEP MODE and

WAIT MODE, by pushing FWUP button when it working in

BACKUP MODE.

GPBR Write in values to four corresponding backup registers.

And then software reset the entire processor and

peripherals. At the next restart, display the value of the

four back-up registers in HyperTerminal, and compare

them with the values written in previously. If there is no

difference between them, LED(D2) will blink, else,

LED(D3) will blink.

RTT Y ou can set the pre-divider value, as well as the RTT alarm

value in this procedure. It will generate a alarm interrupt

as soon as RTT counter reach the value set previously.

RTC This experiment can detect the RTC time and date,

displaying the time the date, setting time and date.

WDT Let watchdog can gener ate an int errupt when it’ s counter

value reach zero or there is a error occurred according

configuring its mode register. NOTE: don’t reset the

system. It will generate an interrupt if you haven’t reset

12/13

www.embedinfo.com/en

an appropriate value to the corresponding register before

the cut-off time.

PWM This procedure sets up PWM channel 0, channel 1 and

channel 2. You can view the output value of channel 0

according P A7 of PB0, view the output value of channel 1

according PA9 or PB2. Positive pulses of Channel 0,

Channel 1 and Channel 2 are as the inputs of D2, D3 a nd

D4 (LED) respectively. Y ou can also configure the channel

according the serial port.

ADC This experiment tests ADC0 and ADC12B and show the

voltage values from the four-channel ADC pins. You can

configure the values of GAIN, Bias Current, Mode, and

Sample Offset.

EEFC To achieve the reading and writing, latches, GPNVM

settings, and erase for the two internal FLASH.

NandFlash Read and write to external NANDFLASH according SMC.

SRAM Test the external SRAM. R ead and write it. If success, D2

lights, else D3 lights.

TIM This procedure mainly tests TC module of the board.

Configure TC working in Waveform Mode. RA=0x1000. It

will generate interrupt and turn on LED light when

generating Comparing matches.

HSMCI This procedure tests the HSMCI interface by using a SD

card with FAT32 file system. It can format the SD card,

write in a bin file, read it and compare its contents with

the contents written in previously.

SSC This sample can play the WAV file, related Information can

display in HyperTerminal. The WAV file must be 48KHz，

Two-channel stereo, and Previously stored in the SD card.

SSC interface connected to WM8731, it can send audio

data to WM8731 and decode simply and play. You can

hear the music by using a headphone.

SPI Achieve the communication between SPI interface and

touch-screen controller. Touch-screen controller can

receive the commands sent from SPI interface and

Feedback the corresponding data to SPI.

Touch Screen The main function of this routine is to obtain the

coordinates of the touch-point on the touch screen, and

print it in the serial port and LCD screen.

13/13

www.embedinfo.com/en

LCD LCD display routines. It can display characters, text,

graphics and so on.

TWI This procedure test Temp. Sensor according TWI. It can

read the va lues of the sensor inte rnal registers, access to

the current configuration, and get the current

temperature value.

UDPHS This is a USB mass-storage test case. There are two DISK

sample in this project, one for Extended SRAM addressed

from 0x60000000(size: 512KB),one for SD Card inserting

on the SD/MMC socket of the board.

USB_CDC This procedure achieves the test for the USB

Communication Device class (CDC) serial communication.

RTX_Traffic BLINKY test case based on RTX operating system. It

simulates the changes of traffic lights at a crossroads.