2003 Microchip Technology Inc. DS80128F-page 1
PIC16F87XA
The PIC16F87XA Rev. B0 parts you have received
conform functionally to the Device Data Sheet
(DS39582B), except for the anomalies described
below. This Errata Sheet supersedes any previously
published Errata for PIC16F87XA Rev. B0.
All the problems listed here will be addressed in future
revisions of the P IC16F 87XA silicon.
1. Module: A/D (Electrical Specifications)
The linearity and error specifications of the A/D
module vary from the originally published specifi-
cations. The new values for 28-pin devices are
shown in Table 1 (below).
To meet these specifications while operating the
microcontroller at the maximum clock speed of
20 MHz, the A/D conversion clock must always
be configured for divide-by-64 operation
(ADCON0<7:6> = 10, ADCON1<6> = 1).
The 40-pin devices of the PIC16F87XA product
family continue to meet the previously published
specifications in the Device Data Sheet.
Work around
This problem is specific to the Rev. B0 and has
been resolved by Rev. B2 of the silicon (date
codes later than 0242xxx).
TABLE 1:
A/D CO NVERTER CHARACT ERISTICS (PARTIAL): PIC16F873A/876A (IND USTRIAL)
PIC16LF873A/876A (INDUS TRIAL)
Note: This issue applies only to 28-pin parts
of this device family (PIC16F873A
and PIC16F876A). PIC16F874A and
PIC16F8 77A dev ices are not affected.
Param
No. Sym. Characteristic New Specification Data Sheet
Specification Units
Min Typ Max Min Typ Max
A03 EIL Integral linearity error PIC16F873A/876A — — ±1.4 ——<±1LSb
A04 EDL Differential linearity
error PIC16F873A/876A ——±1.4 ——<±1LSb
A07 EGN Gain error PIC16F873A/876A — — ±2.0 ——<±1LSb
PIC16F87XA Rev. B0 Silicon Errata Sheet
PIC16F87XA
DS80128F-page 2 2003 Microchip Technology Inc.
2. Module: Flash Program Memory
To ensure proper reading of data from tables in
Flash Program Memory, as described in
Section 3.5 of t he Device Dat a Sheet, the following
work around is necessary.
Work around
A software workaround will enable Flash program
memory to fu nct ion as p ubl is hed . O ne NOP sh ould
precede and six NOPs sh oul d follo w the ins tructio n
that sets the read bit.
Replace the required 3-instruction sequence,
shown in Example 3-3 of the Data Sheet, with the
sequence shown in Example 1 (below). The
interrupts should be disabled during this process.
This problem is specific to Rev. B0 and has been
resolve d by Rev. B2 of th e silic on (date codes later
than 0242x xx ).
EXAMPLE 1:
BCF INTCON, GIE ;Disable the interrupts
NOP ;This NOP is required for the workaround.
BSF EECON1, RD ;This initiates program memory read.
NOP ;Any instructions here are ignored while program memory is read in the
NOP ;second instruction cycle after BSF EECON1, RD.
NOP ;These four NOP's are required for the workaround.
NOP
NOP
NOP
BSF INTCON, GIE ;Enable the interrupts
2003 Microchip Technology Inc. DS80128F-page 3
PIC16F87XA
3. Module: Core
Cert ain code sequence and placem ent may cause
the cor rupti on of a fe w bits in th e instru ction fetch
when the part is used above 4 MHz. A corrupted
instruction fetch will cause the part to execute an
improper instruction and result in unpredictable
outputs.
Microchip cannot predict which code sequences
and placement will cause this failure. If this failure
mechanism exists in your system, it should be evi-
dent during statistically significant preproduction
testing (minimum suggested sample size 100
units) of your particular code sequence and
placement.
Any code change should be tested in the same
manner pri or to th eir im pl ementati on. If mos t p arts
fail your tests, or if fa ilu res are seen a t all voltage s
or at all frequen cies, this indicates t hat the problem
experienced does not relate to this failure
mechanism.
This problem has not been observed at operating
frequencies below 4 MHz.
Work around
Use the part at or below 4 MHz.
This problem is specific to Rev. B0 and has been
resolve d by R ev. B2 o f the si licon (d ate code s later
than 0242x xx ).
4. 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 confl icts with the second
sentenc e of Note 1 on page 131 of the devic e data
sheet: “Pins configured as digital inputs will
convert an analog input.”
Work around
For the ADC m odule to be en abled, it is nec essary
to either:
1. Enable the comparators (CMCON<2:0> ≠ 111).
2. Configure at least one ADC channel as an
analog inp ut (ADCO N1< 3:0> ≠011x).
Clarifications/Correc ti ons to the Data
Sheet:
In the Device Data Sheet (DS39582B), the following
clarifications and corrections should be noted.
None.
PIC16F87XA
DS80128F-page 4 2003 Microchip Technology Inc.
APPENDIX A: REVISION HISTORY
Rev A Document (5/2002)
First revision of this document. Added silicon issues 1
(A/D) and 2 (Flash Progra m Memo ry).
Rev B Document (8/2002)
Added silicon issues 3 (Oscillator) and
4 (A/D Operation).
Added data sheet clarification issue 1 (Comparator).
Rev C Document (12/2002)
Replaced silicon issue 3 (Oscillator) with (Core).
Updated silicon issues 1 (A/D Electrical Specifications),
2 (Flash Program Memory) and 4 (A/D Operation).
Rev D Document (3/2003)
Added data sheet clarification issue 2
(Packaging – Pinout and Product Identification).
Rev E Document (9/2003)
Added data sheet clarification issue 3 (Voltage
Referenc e Specifications).
Rev F Document (10/2003)
Removed all data sheet clarification issues because of
updated data sheet revision.
DS80128F-page 5 2003 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is intended through sug gestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microc hip Technology Incorporat ed with respect
to the accuracy or use of such inf orm ation, or inf ringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE and PowerSmart are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
AmpLab, FilterLab, microID, MXDEV, MXLAB, PICMASTER,
SEEVAL and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
Application Maestro, dsPICDEM, dsPICDEM.net, ECAN,
ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
PICkit, PICDEM, PICDEM.net, PowerCal, PowerInfo,
PowerMate, PowerTool, rfLAB, rfPIC, Select Mode,
SmartSensor , SmartShunt, SmartTel and Total Endurance are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorpora ted in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2003, 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 prot ection features of our
products. Attempts to break microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such ac t s
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and M ountain View, Cali fornia i n March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, micr operipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design an d manufacture of development
systems is ISO 9001 certified.
DS80128F-page 6 2003 Microchip Technology Inc.
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