w78le58 Winbond Electronics Corp America, w78le58 Datasheet - Page 30

• Manufacturer Part Number: w78le58
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

BLANK_CHECK_ERROR:
;*******************************************************************************
;* RE-PROGRAMMING 32KB APROM BANK
;*******************************************************************************
PROGRAM_32KROM:
PROG_D_32K:
;*****************************************************************************
; * VERIFY 32KB APROM BANK
;*****************************************************************************
CJNE A,#FFH,BLANK_CHECK_ERROR
INC SFRAL
MOV A,SFRAL
JNZ BLANK_CHECK_LOOP
INC SFRAH
MOV A,SFRAH
CJNE A,#80H,BLANK_CHECK_LOOP ; END ADDRESS = 7FFFH
JMP PROGRAM_32KROM
CJNE R2,#0H,PROG_D_32K
INC R1
MOV SFRAH,R1
MOV P1,#F0H
MOV P3,#F0H
MOV DPTR,#0H
MOV R1,#00H
MOV DPTR,#0H
MOV SFRAH,R1
MOV R6,#BEH
MOV R7,#FFH
MOV TL0,R6
MOV TH0,R7
MOV SFRAL,R2
MOV SFRFD,A
MOV TCON,#10H
MOV PCON,#01H
MOV R4,#03H
MOV R6,#FEH
MOV R7,#FFH
MOV TL0,R6
MOV TH0,R7
MOV DPTR,#0H
MOV R2,#0H
MOV R1,#0H
JMP $
MOVX A,@DPTR
INC DPTR
INC R2
CJNE R1,#80H,PROG_D_32K
MOV R2,#00H
MOV SFRCN,#21H
; NEXT ADDRESS
; 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 32K)
; SET TIMER FOR PROGRAMMING, ABOUT 50 S.
; SFRAL(C4H) = LOW BYTE ADDRESS
; READ DATA FROM EXTERNAL SRAM BUFFER. BY ACCORDING USER?
; CIRCUIT, USER MUST MODIFY THIS INSTRUCTION TO FETCH CODE
; SFRFD(C6H) = DATA IN
; TCON = 10H, TR0 = 1,GO
; ENTER IDLE MODE (PRORGAMMING)
; ERROR COUNTER
; SET TIMER FOR READ VERIFY, ABOUT 1.5 S.
; The start address of sample code
; Target low byte address
; Target high byte address
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Preliminary W78LE58