© 2005 Microchip Technology Inc.

DS80209D-page 13

PIC18F2420/2520/4420/4520

REVISION HISTORY

Rev A Document (9/2004)

First revision of this document which includes silicon

issues 1-6 (ECCP), 7-11 (MSSP), 12 (ECCP and CCP),

13 (A/D), 14-15 (Timer1/Timer3) and 16 (BOD/HLVD).

Rev B Document (11/2004)

Changes made to silicon issue 7 (MSSP), 9 (MSSP)

and 10 (MSSP). Added silicon issue 17 (EUSART),

18 (Interrupts), 19 (ECCP) and 20 (Timer1/Timer3).

Rev C Document (2/2005)

Added Date Code information to all issues, updated text

and reordered issues for clarity. Issues in this revision

are: 1-5 (MSSP), 6-8, 10-12, 14-15 (ECCP), 9, 13

(ECCP and CCP), 16 (A/D), 17 (BOD), 18-19

(EUSART), 20-22 (Timer1/Timer3) and 23 (Interrupts).

Rev D Document (12/2005)

Updated issues 4 (MSSP), 9 (ECCP and CCP) and 23

(Interrupts). Added issues 24-26 (EUSART), 27-31

(MSSP), 32 (MSSP – SPI Mode) and 33 (Timer1 –

Asynchronous Counter).