PIC16F91X/946 Family Silicon Errata and Data Sheet Clarification

PIC16F91X/946
PIC16F91X/946 Family
Silicon Errata and Data Sheet Clarification
The PIC16F91X/946 family devices that you have
received conform functionally to the current Device Data
Sheet (DS41250F), except for the anomalies described
in this document.
For example, to identify the silicon revision level using
MPLAB IDE in conjunction with MPLAB ICD 2,
MPLAB ICD 3, PICkit™ 2 or PICkit™ 3:
1.
The silicon issues discussed in the following pages are
for silicon revisions with the Device and Revision IDs
listed in Table 1. The silicon issues are summarized in
Table 2.
2.
The errata described in this document will be addressed
in future revisions of the PIC16F91X/946 silicon.
Note:
3.
This document summarizes all silicon
errata issues from all revisions of silicon,
previous as well as current. Only the
issues indicated in the last column of
Table 2 apply to the current silicon
revision.
4.
Note:
Data Sheet clarifications and corrections start on page 6,
following the discussion of silicon issues.
The silicon revision level can be identified using the
current version of MPLAB® IDE and Microchip’s
programmers, debuggers, and emulation tools, which
are available at the Microchip corporate web site
(www.microchip.com).
TABLE 1:
Using the appropriate interface, connect the
device to the MPLAB ICD 2 and MPLAB ICD 3
programmer/debugger, PICkit™ 2 or PICkit™ 3.
From the main menu in MPLAB IDE, select
Configure>Select Device, and then select the
target part number in the dialog box.
Select
the
MPLAB
hardware
tool
(Programmer>Select Tool).
Perform a “Connect” operation to the device
(Programmer>Connect). Depending on the
development tool used, the part number and
Device Revision ID value appear in the Output
window.
If you are unable to extract the silicon
revision level, please contact your local
Microchip sales office for assistance.
The Device ID values for the various devices and
silicon revisions are shown in Table 1.
SILICON DEVREV VALUES
Part Number
Revision ID for Silicon Revision(2)
Device ID(1)
A0
A1
A2
A3
B0
B1
B2
B3
PIC16F913
13Exh
0
0
1
2
PIC16F914
13Cxh
0
0
1
2
PIC16F916
13Axh
0
0
1
2
2
3
4
PIC16F917
138xh
0
0
1
2
2
3
4
PIC16F946
146xh
0
0
1
Note 1:
2:
The device and revision data is stored in the Device ID located at 2006h in program memory.
Refer to the “PIC16F91X/946 Memory Programming Specification” (DS41244) for detailed information.
© 2009 Microchip Technology Inc.
DS80238C-page 1
PIC16F91X/946
TABLE 2:
Module
SILICON ISSUE SUMMARY (PIC16F913/914)
Feature
Item
Number
Affected Revisions(1)
Issue Summary
A0
A1
A2
A3
Type B
1.
Incorrect waveforms.
x
x
x
x
Timer1
LP
2.
Low drive as temp. approaches -40°C.
x
x
x
x
Timer1
Ext. Crystal
3.
Overflow may take additional count.
x
x
x
x
Timer0/
WDT
Prescaler
4.
Reset under specific conditions.
x
x
x
x
LCD
Note 1:
Only those issues indicated in the last column apply to the current silicon revision.
TABLE 3:
Module
SILICON ISSUE SUMMARY (PIC16F916/917)
Feature
Item
Number
Affected Revisions(1)
Issue Summary
A0
A1
A2
B0
B1
B2
B3
Type B
1.
Incorrect waveforms.
x
x
x
x
x
x
x
Timer1
LP
2.
Low drive as temp. approaches -40°C.
x
x
x
x
x
x
x
Timer1
Ext. Crystal
3.
Overflow may take additional count.
x
x
x
x
x
x
x
Timer0/
WDT
Prescaler
4.
Reset under specific conditions.
x
x
x
x
x
x
x
LCD
Note 1:
Only those issues indicated in the last column apply to the current silicon revision.
TABLE 4:
Module
SILICON ISSUE SUMMARY (PIC16F946)
Feature
Item
Number
Affected Revisions(1)
Issue Summary
A0
A1
A2
Type B
1.
Incorrect waveforms.
x
x
x
Timer1
LP
2.
Low drive as temp. approaches -40°C.
x
x
x
Timer1
Ext. Crystal
3.
Overflow may take additional count.
x
x
x
Timer0/
WDT
Prescaler
4.
Reset under specific conditions.
x
x
x
LCD
Note 1:
Only those issues indicated in the last column apply to the current silicon revision.
DS80238C-page 2
© 2009 Microchip Technology Inc.
PIC16F91X/946
Silicon Errata Issues
Note:
This document summarizes all silicon
errata issues from all revisions of silicon,
previous as well as current. Only the
issues indicated by the shaded column in
the following tables apply to the current
silicon revision (as applicable).
1. Module: LCD
Work around
Avoid the use of type-B waveforms with one-third
multiplex. When one-third is required, use type-A
waveforms.
Affected Silicon Revisions
PIC16F913/914
A0
A1
A2
A3
X
X
X
X
A0
A1
A2
B0
B1
B2
B3
X
X
X
X
X
X
X
PIC16F946
A2
X
X
X
This can also prevent Timer1 oscillator start-up
under cold conditions.
© 2009 Microchip Technology Inc.
Use of low-power crystals properly matched to the
device will reduce the likelihood of failure. A 1MΩ
resister between OSC2 and VDD will further
improve the drive strength of the circuit.
Affected Silicon Revisions
PIC16F913/914
A0
A1
A2
A3
X
X
X
X
PIC16F916/917
PIC16F916/917
A1
1-2% of devices experience reduced drive as
temperatures approach -40°C. This will result in a
loss of Timer1 counts or stopped Timer1
oscillation.
Work around
The LCD module may generate incorrect
waveforms when using type-B waveforms (WFT =
1) with one-third multiplex (LMUX<1:0> = 10).
A0
2. Module: LP/Timer1 Oscillator Operation
Below 25°C
A0
A1
A2
B0
B1
B2
B3
X
X
X
X
X
X
X
PIC16F946
A0
A1
A2
X
X
X
DS80238C-page 3
PIC16F91X/946
3. Module: Asynchronous Timer1
This Errata supersedes Errata DS80329.
When TImer1 is started or updated, the timer
needs to see a falling edge from the external clock
source before a rising edge can increment the
counter. If writes to TMR1H and TMR1L are not
completed while the external clock pulse is still
high, Timer1 will not count the first clock pulse after
the update.
When using an external crystal, the pulse width
from rising to falling edge is temperature
dependent and may decrease with temperature.
As a result, the timer may require an additional
oscillation to overflow.
Work around
Switching to the HFINTOSC after reloading, the
timer ensures the Timer1 will see a falling edge
before switching back to the external clock source.
Due to the time from Timer1 overflow to the reload
being application specific, wait for the timer to
increment before beginning the reload sequence.
This ensures the timer does not miss a rising edge
during reload.
EXAMPLE 1:
BTFSC
GOTO
BTFSS
GOTO
TMR1L,0
$-1
TMR1L,0
$-1
;Timer has just incremented, 31 μs before next rising edge to
;complete reload
Update:
BCF
BSF
BCF
BSF
BCF
T1CON,TMR1CS
TMR1H,7
T1CON,TMR1ON
T1CON,TMR1CS
T1CON,TMR1ON
;Select
;Timer1
;Timer1
;Select
;Timer1
HFINTOSC for Timer1
high byte 0x80
off
external crystal
on
Critical Timing of code sequence for instructions following last write to TMR1L or TMR1H.
Affected Silicon Revisions
PIC16F913/914
A0
A1
A2
A3
X
X
X
X
PIC16F916/917
A0
A1
A2
B0
B1
B2
B3
X
X
X
X
X
X
X
PIC16F946
A0
A1
A2
X
X
X
DS80238C-page 4
© 2009 Microchip Technology Inc.
PIC16F91X/946
4. Module: Timer0 and WDT Prescaler
Assignment Spurious Reset
A spurious Reset may occur if the Timer0/Watchdog Timer (WDT) prescaler is assigned from the
WDT to Timer0 and then back to the WDT.
Summary
The issue only arises when all of the below
conditions are met:
• Timer0 external clock input (TOCKI) is enabled.
• The Prescaler is assigned to the WDT, then to
the Timer0 and back to the WDT.
• During the assignments, the T0CKI pin is high
when bit TOSE is set, or low when TOSE is
clear.
• The 1:1 Prescaler option is chosen.
Affected Silicon Revisions
PIC16F913/914
A0
A1
A2
A3
X
X
X
X
PIC16F916/917
A0
A1
A2
B0
B1
B2
B3
X
X
X
X
X
X
X
PIC16F946
A0
A1
A2
X
X
X
Description
On a POR, the Timer0/WDT prescaler is assigned
to the WDT.
If the prescaler is reassigned to Timer0 and Timer0
external clock input (TOCKI) is enabled then the
prescaler would be clocked by a transition on the
TOCKI pin.
On power-up, the TOCKI pin is (by default)
enabled for Timer0 in the OPTION register.
If the T0CKI pin is:
• High and Timer0 is configured to transition on a
falling edge (TOSE set), or
• Low and Timer0 is configured to transition on a
rising edge (TOSE clear)
Then, if the prescaler is reassigned to the WDT, a
clock pulse to the prescaler will be generated on
the reassignment.
If the prescaler is configured for the 1:1 option, the
clock pulse will incorrectly cause a WDT Time-out
Reset of the device.
Work around
1.
Disable the Timer0 external clock input by
clearing the TOCKI bit in the OPTION
register.
2.
Modify the TOSE bit in the OPTION register to
the opposite configuration for the logic level
on the T0CKI pin.
3.
Select a prescaler rate other than 1:1 and
issue a CLRWDT instruction before switching
to the final prescaler rate.
© 2009 Microchip Technology Inc.
DS80238C-page 5
PIC16F91X/946
Data Sheet Clarifications
APPENDIX A:
The following typographical corrections and clarifications are to be noted for the latest version of the device
data sheet (DS41250F):
Rev A Document (5/2005)
Initial release of Errata, adding Items 1-3.
Note:
Corrections are shown in bold. Where
possible, the original bold text formatting
has been removed for clarity.
1. Module: LCD Driver Module Block
Diagram (Note 1)
In Figure 10-1; “LCD Driver Module Block Diagram,” page 144, change Note 1:
From: These are not directly connected to the I/O
pads, but may be tri-stated, depending on
the configuration of the LCD module.
To:
DOCUMENT
REVISION HISTORY
Rev B Document (2/2007)
Added Module 1: LCD.
Rev. C Document (4/2009)
Updated Errata to new format. This Errata supersedes
Errata DS80329.
Data Sheet Clarification: Removed Module 1:
CCPR2L/CCPR2H Address and Module 3: MCLR.
Added Module 2: LP/Timer1 Oscillator Operation
Below 25°C; Added Module 3: Asynchronous Timer1;
Module 4: Timer0 and WDT Prescaler Assignment
Spurious Reset.
These signals are connected directly to
the I/O pads, but may be tri-stated,
depending on the configuration of the LCD
module.
DS80238C-page 6
© 2009 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
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suits, or expenses resulting from such use. 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, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
FilterLab, Hampshire, Linear Active Thermistor, MXDEV,
MXLAB, 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, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP,
PICkit, PICDEM, PICDEM.net, PICtail, PIC32 logo, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select
Mode, Total Endurance, TSHARC, WiperLock and ZENA 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.
© 2009, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, 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.
© 2009 Microchip Technology Inc.
DS80238C-page 7
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03/26/09
DS80238C-page 8
© 2009 Microchip Technology Inc.