PIC18F2220/2320/4220/4320 Rev. C2 Silicon Errata

PIC18F2220/2320/4220/4320
PIC18F2220/2320/4220/4320 Rev. C2 Silicon Errata
The PIC18F2220/2320/4220/4320 Rev. C2 parts you
have received conform functionally to the Device Data
Sheet (DS39599G), except for the anomalies
described below. Any Data Sheet Clarification issues
related to the PIC18F2220/2320/4220/4320 will be
reported in a separate Data Sheet errata. Please check
the Microchip web site for any existing issues.
The following silicon errata apply only to
PIC18F2220/2320/4220/4320 devices with these
Device/Revision IDs:
Part Number
Device ID
Revision ID
PIC18F2220
0000 0101 100
0 0111
PIC18F2320
0000 0101 000
0 0111
PIC18F4220
0000 0101 101
0 0111
PIC18F4320
0000 0101 001
0 0111
The Device IDs (DEVID1 and DEVID2) are located at
addresses 3FFFFEh:3FFFFFh in the device’s
configuration space. They are shown in binary in the
format “DEVID2 DEVID1”.
All of the issues listed here will be addressed in future
revisions of the PIC18F2220/2320/4220/4320 silicon.
1. 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
This is repeated for each DAW instruction.
Date Codes that pertain to this issue:
All engineering and production devices.
© 2008 Microchip Technology Inc.
DS80403A-page 1
PIC18F2220/2320/4220/4320
2. Module: MSSP (All I2C™ and SPI Modes)
The Buffer Full flag bit (BF) of the SSPSTAT register (SSPSTAT<0>) may be inadvertently cleared,
even when the SSPBUF register has not been
read. This will occur only when the following two
conditions occur simultaneously:
• The four Least Significant bits of the BSR
register are equal to 0Fh (BSR<3:0> = 1111)
and
• Any instruction that contains C9h in its 8 Least
Significant bits (i.e., register file addresses,
literal data, address offsets, etc.) is executed.
Work around
Identified work arounds will involve setting the
contents of BSR<3:0> to some value other than
0Fh.
In addition to those proposed below, other solutions
may exist.
1. When developing or modifying code, keep
these guidelines in mind:
• Assign 12-bit addresses to all variables.
This allows the assembler to know when
Access Banking can be used.
• Do not set the BSR to point to Bank 15
(BSR = 0Fh).
• Allow the assembler to manipulate the
Access bit present in most instructions.
Accessing the SFRs in Bank 15 will be done
through the Access Bank. Continue to use
the BSR to select all GPR Banks.
2. If accessing a part of Bank 15 is required and
the use of Access Banking is not possible,
consider using indirect addressing.
3. If pointing the BSR to Bank 15 is unavoidable,
review the absolute file listing. Verify that no
instructions contain C9h in the 8 Least Significant bits while the BSR points to Bank 15
(BSR = 0Fh).
3. Module: MSSP (SPI, Slave Mode)
In its current implementation, the SS (Slave
Select) control signal generated by an external
master processor may not be successfully recognized by the PIC® microcontroller operating in
Slave Select mode (SSPM3:SSPM0 = 0100). In
particular, it has been observed that faster transitions (those with shorter fall times) are more likely
to be missed than slower transitions.
Work around
Insert a series resistor between the source of the
SS signal and the corresponding SS input line of
the microcontroller. The value of the resistor is
dependent on both the application system’s
characteristics and process variations between
microcontrollers. Experimentation and thorough
testing is encouraged.
This is a recommended solution; others may exist.
Date Codes that pertain to this issue:
All engineering and production devices.
Date Codes that pertain to this issue:
All engineering and production devices.
DS80403A-page 2
© 2008 Microchip Technology Inc.
PIC18F2220/2320/4220/4320
REVISION HISTORY
Rev A Document (9/2008)
Initial release of this errata. Includes silicon issues 1
(Core – DAW Instruction), 2 (MSSP – All I2C™ and SPI
modes) and 3 (MSSP – SPI, Slave Mode).
© 2008 Microchip Technology Inc.
DS80403A-page 3
PIC18F2220/2320/4220/4320
NOTES:
DS80403A-page 4
© 2008 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
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OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
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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
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FilterLab, 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, PICkit, PICDEM,
PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, 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.
© 2008, 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.
© 2008 Microchip Technology Inc.
DS80403A-page 5
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DS80403A-page 6
© 2008 Microchip Technology Inc.