W79E648 Datasheet, PDF (79/80 Pages) Winbond – Fast 8051 Compatible microcontroller with a redesigned Processor

Preliminary W79E648
; SFRCN = 80H , Read APFlash1
READ_VERIFY_64K:
MOV SFRAL,R2
; SFRAL = LOW ADDRESS
MOV TCON,#10H
; TCON = 10H, TR0 = 1,GO
MOV PCON,#01H
INC R2
MOVX A,@DPTR
INC DPTR
CJNE A,SFRFD,ERROR_64K
CJNE R2,#0H,READ_VERIFY_64K
INC R1
MOV SFRAH,R1
CJNE R1,#0H,READ_VERIFY_64K
;******************************************************************************
;* PROGRAMMING COMPLETLY, SOFTWARE RESET CPU
;******************************************************************************
MOV TA,#AAH
MOV TA,#55H
MOV CHPCON,#83H ; SOFTWARE RESET. CPU will restart from APFlash0
ERROR_64K:
DJNZ R4,UPDATE_64K ; IF ERROR OCCURS, REPEAT 3 TIMES.
.
; IN-SYST PROGRAMMING FAIL, USER'S PROCESS TO DEAL WITH IT.
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Publication Release Date: 05/31/2004
Revision A1