PIC18F2331/2431/4331/4431 Rev. A3 Silicon Errata

PIC18F2331/2431/4331/4431
PIC18F2331/2431/4331/4431 Rev. A3 Silicon Errata
The PIC18F2331/2431/4331/4431 parts you have
received conform functionally to the Device Data Sheet
(DS39616), except for the anomalies described below.
Any Data Sheet Clarification issues related to the
PIC18F2331/2431/4331/4431 will be reported in a
separate Data Sheet errata. Please check the
Microchip web site for any existing issues.
All the issues listed here will be addressed in future
revisions of the PIC18F2331/2431/4331/4431 silicon.
The following silicon errata apply only to
PIC18F2331/2431/4331/4431 devices with these
Device/Revision IDs:
Part Number
Device ID
Revision ID
PIC18F2331
00 1000 111
00010
PIC18F2431
00 1000 110
00010
PIC18F4331
00 1000 101
00010
PIC18F4431
00 1000 100
00010
The Device IDs (DEVID1 and DEVID2) are located at
addresses 3FFFFEh:3FFFFFh in the device’s
configuration space. They are shown in hexadecimal
in the format “DEVID2 DEVID1”.
1. Module: PCPWM
When the PCPWM is operated in Complementary
mode with a non-zero dead-time value and the
duty cycle results in an active-low time of less than
1 TCY, the PWM generator will miss the rising edge
for a new PWM period and the PWM output will
alternate between one PWM period high and one
PWM period low.
Work around
2. Module: PCPWM
When the PCPWM is operated in Center-Aligned
mode with double updates and the duty cycle
alternates on each update between a zero and
non-zero value, an incorrect waveform is generated (the PWM output will alternate between one
PWM period high and one PWM period low). If in
Complementary mode, dead time will not be
inserted properly.
Work around
Do not use zero duty cycle when in Center-Aligned
mode with double updates. Instead of zero, set the
duty cycle to a small, non-zero value.
Date Codes that pertain to this issue:
All engineering and production devices.
3. Module: PCPWM
When the PCPWM is operated in Center-Aligned
mode with double updates and the duty cycle
alternates on each update between a greater than
100% duty cycle and a non-zero value, an incorrect
waveform is generated.
Work around
Do not use equal to or greater than 100% duty cycle
when in Center-Aligned mode with double updates.
Ensure that the maximum duty cycle value is
always smaller than or equal to the PWM period,
i.e., PDCH:PDCL ≤ (4 * (PTPERH:PTPERL)).
Date Codes that pertain to this issue:
All engineering and production devices.
When in Complementary mode with a non-zero
dead-time value, ensure that the active-low time
will always be greater than 1 TCY. In other words,
when dead time is not equal to zero, ensure that:
PDCH:PDCL < (4 * PTPERH:PTPERL)
or
PDCH:PDCL > (4 * (PTPERH:PTPERL + 1))
Date Codes that pertain to this issue:
All engineering and production devices.
© 2005 Microchip Technology Inc.
DS80192C-page 1
PIC18F2331/2431/4331/4431
4. Module: PCPWM
If dead-time insertion is enabled and it is a nonzero value, glitches in the PWM output will occur
under the following conditions:
1. When the PWM timer is stopped by clearing
the PTEN bit.
2. When the duty cycle is changed to zero.
Work around
1. Before disabling the PWM timer, ensure that
PORTB is set up to maintain a safe state of
external hardware and that TRISB is set up to
define the pins as outputs.
2. Do not use zero duty cycle when dead-time
insertion is enabled. Instead of zero, set the
duty cycle to a small, non-zero value (such as
‘1’).
7. Module: Core (DAW Instruction)
The DAW instruction may improperly clear the
Carry bit (STATUS<0>) when executed.
Work around
Test the Carry bit state before executing the DAW
instruction. If the Carry bit is set, increment the
next higher byte to be added, using an instruction
such as INCFSZ (this instruction does not affect
any Status flags and will not overflow a BCD
nibble). After the DAW instruction has been
executed, process the Carry bit normally (see
Example 1).
EXAMPLE 1:
PROCESSING THE CARRY
BIT DURING BCD ADDITIONS
MOVLW
ADDLW
0x80
0x80
; .80 (BCD)
; .80 (BCD)
BTFSC
INCFSZ
DAW
BTFSC
INCFSZ
STATUS, C
byte2
; test C
; inc next higher LSB
STATUS, C
byte2
; test C
; inc next higher LSB
Date Codes that pertain to this issue:
All engineering and production devices.
5. Module: PCPWM
The PTMRH register will read as ‘00’ or the last
value written to it, even though the upper four bits
of the PWM timer may be different. Writing to
PTMRH will effect the upper four bits of the PWM
timer when PTMRL is subsequently written.
Although the PWM timer operates correctly, the
double-buffer circuit does not transfer data to the
PTMRH register from the upper four bits of the
PWM timer.
Work around
PWM operation is not affected. Do not attempt to
read PTMRH.
Date Codes that pertain to this issue:
All engineering and production devices.
6. Module: PCPWM
In Complementary mode with dead-time insertion,
when using OVDCOND and OVDCONS to
override the PWM outputs, dead time is not
inserted correctly when the dead-time prescaler is
FOSC/4, FOSC/8 or FOSC/16.
Work around
None. Use dead-time prescaler of FOSC/2 in these
circumstances.
Date Codes that pertain to this issue:
All engineering and production devices.
DS80192C-page 2
This is repeated for each DAW instruction.
Date Codes that pertain to this issue:
All engineering and production devices.
8. Module: EUSART
Bit SENDB in the TXSTA register is not automatically cleared by hardware upon completion of
transmission of a Sync Break.
Work around
Check the TRMT bit in TXSTA. If the TRMT bit is
set, Break transmission is said to be complete.
9. Module: EUSART
If the transmitter is left enabled while the module is
performing an auto-baud operation, an arbitrary
data byte may get transmitted.
Work around
Clear TXEN bit (TXSTA<5>) before any auto-baud
operation and set it after auto-baud is complete.
Enable TXEN only when a data byte is to be
transmitted. Care must be taken to ensure that the
TX pin is pulled high, either through an external
resistor, or by making the TX pin an output and
writing ‘1’ to it, to not disturb the transmit line.
© 2005 Microchip Technology Inc.
PIC18F2331/2431/4331/4431
10. Module: EUSART
14. Module: EUSART
This module may perform incorrect auto-baud
calculation if the ABDEN (BAUDCTL<0>) bit was
set while the receive pin was at a low level.
The EUSART cannot receive asynchronous data at
the four fastest baud rates (BRGH = 1, BRG16 = 1
and SPBRG < 4).
Work around
Work around
Wait for the RX pin to go high and then set the
ABDEN bit.
Use a slower baud rate or a faster system clock
speed.
11. Module: EUSART
In Asynchronous Receiver mode, the EUSART
does not load the SPBRGH value after completion
of auto-baud.
Work around
Do not enable the BRG16 (BAUDCTL<3>) bit.
If the BRG16 is in use, ensure that the auto-baud
SPBRG value does not exceed the 8-bit value.
12. Module: EUSART
The CREN (RCSTA<4>) bit is cleared after every
auto-baud operation.
Work around
Upon completion of auto-baud, manually set the
CREN bit.
15. Module: HSADC
A ΔIAD (parameter D026) of greater than 300 μA
(for VDD = 3V) is observed when the device is
put into Sleep mode with the HSADC enabled
(ADON = 1) without setting the GO/DONE bit so
that at least one conversion is performed.
Observed ΔIAD will increase in proportion to VDD.
Work around
If no conversion will be done while in Sleep mode,
disable the HSADC module by clearing the ADON
bit before entering Sleep mode.
If power consumption is an issue for the
application, do not put the part into Sleep mode
with the HSADC enabled if no conversion is to be
performed.
13. Module: EUSART
Writing to the USART/EUSART TXREG register
faster than the baud rate in Synchronous mode
will overwrite the previous value instead of
double-buffering, as in Asynchronous mode.
Work around
Load the first character into TXREG and then wait
for a TX interrupt, or check the TXIF bit before
writing each additional character to TXREG.
© 2005 Microchip Technology Inc.
DS80192C-page 3
PIC18F2331/2431/4331/4431
REVISION HISTORY
Rev A Document (6/2004)
First revision of this document. Silicon issues 1-6
(PCPWM), 7 (Core – DAW Instruction) and 8-14
(EUSART) and Data Sheet Clarification issues 1 (Poweron Reset), 2 (Watchdog Timer), 3 (PWM Equations),
4 (DC Characteristics) and 5 (LVD Characteristics).
Rev B Document (12/2004)
Added Data Sheet Clarification issue 6 (28-Pin QFN
Diagram).
Rev C Document (05/2005)
Added silicon issue 15 (HSADC). All Data Sheet Clarification issues were removed and placed into a separate
Data Sheet Errata.
DS80192C-page 4
© 2005 Microchip Technology Inc.
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.
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 WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,
WRITTEN OR ORAL, STATUTORY OR OTHERWISE,
RELATED TO THE INFORMATION, INCLUDING BUT NOT
LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE,
MERCHANTABILITY OR FITNESS FOR PURPOSE.
Microchip disclaims all liability arising from this information and
its use. Use of Microchip’s products as critical components in
life support systems is not authorized except with express
written approval by Microchip. No licenses are conveyed,
implicitly or otherwise, under any Microchip intellectual property
rights.
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.
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.
© 2005 Microchip Technology Inc.
DS80192C-page 5
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
India - Bangalore
Tel: 91-80-2229-0061
Fax: 91-80-2229-0062
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
India - New Delhi
Tel: 91-11-5160-8631
Fax: 91-11-5160-8632
Austria - Weis
Tel: 43-7242-2244-399
Fax: 43-7242-2244-393
Denmark - Ballerup
Tel: 45-4450-2828
Fax: 45-4485-2829
China - Chengdu
Tel: 86-28-8676-6200
Fax: 86-28-8676-6599
Japan - Kanagawa
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
France - Massy
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
China - Fuzhou
Tel: 86-591-8750-3506
Fax: 86-591-8750-3521
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
Germany - Ismaning
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Atlanta
Alpharetta, GA
Tel: 770-640-0034
Fax: 770-640-0307
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
Kokomo
Kokomo, IN
Tel: 765-864-8360
Fax: 765-864-8387
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
China - Qingdao
Tel: 86-532-502-7355
Fax: 86-532-502-7205
Malaysia - Penang
Tel:011-604-646-8870
Fax:011-604-646-5086
Philippines - Manila
Tel: 011-632-634-9065
Fax: 011-632-634-9069
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
England - Berkshire
Tel: 44-118-921-5869
Fax: 44-118-921-5820
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Taiwan - Hsinchu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
San Jose
Mountain View, CA
Tel: 650-215-1444
Fax: 650-961-0286
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
04/20/05
DS80192C-page 6
© 2005 Microchip Technology Inc.