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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SPDIP 28 8-Bit 40 MHz I/O number 25
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© 2008 Microchip Technology Inc. DS80209H-page 1
PIC18F2420/2520/4420/4520
The PIC18F2420/2520/4420/4520 Rev. A1 parts you
have received conform functionally to the Device Data
Sheet (DS39631D), except for the anomalies
described below. Any Data Sheet Clarification issues
related to the PIC18F2420/2520/4420/4520 will be
reported in a separate Data Sheet errata. Please check
the Microchip web site for any existing issues.
All the problems listed here will be addressed in future
revisions of the PIC18F2420/2520/4420/4520 silicon.
The following silicon errata apply only to
PIC18F2420/2520/4420/4520 devices with these
Device/Revision IDs:
1. Module: MSSP
In its current implementation, the I
2
C™ Master
mode operates as follows:
a) The Baud Rate Generator for I
2
C in Master
mode is slower than the rates specified in
Table 17-3 of the Device Data Sheet.
For this revision of silicon, use the values
shown in Table 1 in place of those shown in
Table 17-3 of the Device Data Sheet. The
differences are shown in bold text.
b) Use the following formula in place of the one
shown in Register 17-4 (SSPCON1) of the
Device Data Sheet for bit description
SSPM3:SSPM0 = 1000.
SSPADD = INT((F
CY/FSCL) – (FCY/1.111 MHz)) – 1
Date Codes that pertain to this issue:
All engineering and production devices.
TABLE 1: I
2
C™ CLOCK RATE w/BRG
Part Number Device ID Revision ID
PIC18F2420 0001 0001 010 0 0001
PIC18F2520 0001 0001 000 0 0001
PIC18F4420 0001 0000 110 0 0001
PIC18F4520 0001 0000 100 0 0001
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”.
FOSC FCY FCY * 2 BRG Value
F
SCL
(2 Rollovers of BRG)
40 MHz 10 MHz 20 MHz 0Eh 400 kHz
(1)
40 MHz 10 MHz 20 MHz 15h 312.5 kHz
40 MHz 10 MHz 20 MHz 59h 100 kHz
16 MHz 4 MHz 8 MHz 05h 400 kHz
(1)
16 MHz 4 MHz 8 MHz 08h 308 kHz
16 MHz 4 MHz 8 MHz 23h 100 kHz
4 MHz 1 MHz 2 MHz 01h 333 kHz
(1)
4 MHz 1 MHz 2 MHz 08h 100 kHz
4 MHz 1 MHz 2 MHz 00h 1 MHz
(1)
Note 1: The I
2
C™ interface does not conform to the 400 kHz I
2
C specification (which applies to rates greater than
100 kHz) in all details, but may be used with care where higher rates are required by the application.
PIC18F2420/2520/4420/4520 Rev. A1 Silicon Errata Sheet

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