© 2005 Microchip Technology Inc. DS80240A-page 1
PIC16F87XA
The PIC16F87XA Rev. B6 parts you have received
conform functionally to the Device Data Sheet
(DS39582B), except for the anomalies described
below.
All the issues listed here will be addressed in future
revisions of the PIC16F87XA silicon.
The following silicon errata apply only to
PIC16F87XA devices with these Device/Revision
IDs:
1. Module: A/D (Operation)
The ADC is disabled when ADCON1<3:0> = 011x
(all inputs digital) and CMCON<2:0> = 111
(comparators are off). This is a special case that
conflicts with the second sentence of Note 1 on
page 131 of the device data sheet: “Pins
configured as digital inputs will convert an analog
input.”
Work around
For the ADC module to be enabled, it is necessary
to either:
1. Enable the comparators (CMCON<2:0> ≠ 111);
or
2. Configure at least one ADC channel as an
analog input (ADCON1<3:0> ≠ 011x).
2. Module: (Program Memory)
A very small number of applications are
experiencing a low failure rate when using self-
write through code types of applications. The most
common of these are bootloader operations. This
type of failure is characterized by a few bytes in
program memory not being written as expected. If
this failure is going to occur, it will occur during a
self-write operation. If a failure is not immediately
observed, then there will be no data retention
issues. The failure does not occur when using an
external programmer through In-Circuit Serial
Programming™ (ICSP™).
This failure is dependent on the sequence of
instructions executed after self-writes. Most of the
failures observed have occurred in applications
running at 5V and with an operating frequency of
12 MHz to 17 MHz.
Good power supply decoupling minimizes this
issue. It is recommended that you use a 0.1 μF
decoupling capacitor with each power pin pair. The
decoupling capacitor should be placed very close
to power pins.
It is recommended that you perform statistically
significant testing within your application’s operat-
ing range (i.e., temperature and voltage) with
devices from multiple lots.
Work around
If your devices are exhibiting this type of failure,
please contact your Microchip sales
representative.
Part Number Device ID Revision ID
PIC16F873A 00 1110 010 00111
PIC16F874A 00 1110 011 00111
PIC16F876A 00 1110 000 00111
PIC16F877A 00 1110 001 00111
PIC16F87XA Rev. B6 Silicon Errata
PIC16F87XA
DS80240A-page 2 © 2005 Microchip Technology Inc.
Clarifications/Corrections to the Data
Sheet:
In the Device Data Sheet (DS39582B), the following
clarifications and corrections should be noted.
None.
REVISION HISTORY
Rev A Document (8/2005)
Original version of this document. Includes silicon
issues 1 (A/D Operation) and 2 (Program Memory).
© 2005 Microchip Technology Inc. DS80240A-page 3
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR WAR-
RANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,
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RELATED TO THE INFORMATION, INCLUDING BUT NOT
LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE,
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Microchip disclaims all liability arising from this information and
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB,
PICMASTER, SEEVAL, SmartSensor and The Embedded
Control Solutions Company are registered trademarks of
Microchip Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Linear Active Thermistor,
MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM,
PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo,
PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode,
Smart Serial, SmartTel, Total Endurance and WiperLock are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2005, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro
®
8-bit MCUs, KEELOQ
®
code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS80240A-page 4 © 2005 Microchip Technology Inc.
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