W78LE516 Datasheet, PDF (30/31 Pages) Winbond – 8-BIT MICROCONTROLLER

Preliminary W78LE516
MOV A,SFRFD
; READ ONE BYTE
CJNE A,#FFH,BLANK_CHECK_ERROR
INC SFRAL
; NEXT ADDRESS
MOV A,SFRAL
JNZ BLANK_CHECK_LOOP
INC SFRAH
MOV A,SFRAH
CJNE A,#0H,BLANK_CHECK_LOOP ; END ADDRESS = FFFFH
JMP PROGRAM_64KROM
BLANK_CHECK_ERROR:
MOV P1,#F0H
MOV P3,#F0H
JMP $
;*******************************************************************************
;* RE-PROGRAMMING 64KB APROM BANK
;*******************************************************************************
PROGRAM_64KROM:
MOV DPTR,#0H
MOV R2,#00H
MOV R1,#00H
MOV DPTR,#0H
MOV SFRAH,R1
MOV SFRCN,#21H
MOV R6,#BEH
MOV R7,#FFH
MOV TL0,R6
MOV TH0,R7
; THE ADDRESS OF NEW ROM CODE
; TARGET LOW BYTE ADDRESS
; TARGET HIGH BYTE ADDRESS
; EXTERNAL SRAM BUFFER ADDRESS
; SFRAH, TARGET HIGH ADDRESS
; SFRCN(C7H) = 21 (PROGRAM 64K)
; SET TIMER FOR PROGRAMMING, ABOUT 50 µS.
PROG_D_64K:
MOV SFRAL,R2
; SFRAL(C4H) = LOW BYTE ADDRESS
MOVX A,@DPTR
; READ DATA FROM EXTERNAL SRAM BUFFER. BY ACCORDING USER?
; CIRCUIT, USER MUST MODIFY THIS INSTRUCTION TO FETCH CODE.
MOV SFRFD,A
; SFRFD(C6H) = DATA IN
MOV TCON,#10H
; TCON = 10H, TR0 = 1,GO
MOV PCON,#01H
; ENTER IDLE MODE (PRORGAMMING)
INC DPTR
INC R2
CJNE R2,#0H,PROG_D_64K
INC R1
MOV SFRAH,R1
CJNE R1,#0H,PROG_D_64K
;*****************************************************************************
; * VERIFY 64KB APROM BANK
;*****************************************************************************
MOV R4,#03H
; ERROR COUNTER
MOV R6,#FEH
; SET TIMER FOR READ VERIFY, ABOUT 1.5 µS.
MOV R7,#FFH
MOV TL0,R6
MOV TH0,R7
MOV DPTR,#0H
; The start address of sample code
MOV R2,#0H
; Target low byte address
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