W78IRD2 Datasheet, PDF (72/76 Pages) Winbond – 8-BIT MICROCONTROLLER

W78IRD2
ANL A, #80H
CJNE A, #80H, UPDATE_64K; CHECK H/W REBOOT MODE ?
MOV CHPCON, #03H ; CHPCON = 03H, ENABLE IN-SYSTEM PROGRAMMING.
MOV CHPENR, #00H ; DISABLE CHPCON WRITE ATTRIBUTE
MOV TCON, #00H
MOV TMOD, #01H
MOV IP, #00H
MOV IE, #82H
MOV R6, #F0H
MOV R7, #FFH
MOV TL0, R6
MOV TH0, R7
MOV TCON, #10H
MOV PCON, #01H
; TCON = 00H, TR = 0 TIMER0 STOP
; TMOD = 01H, SET TIMER0 A 16BIT TIMER
; IP = 00H
; IE = 82H, TIMER0 INTERRUPT ENABLED
; TCON = 10H, TR0 = 1, GO
; ENTER IDLE MODE
UPDATE_64K:
MOV CHPENR, #00H ; DISABLE CHPCON WRITE-ATTRIBUTE
MOV TCON, #00H ; TCON = 00H, TR = 0 TIM0 STOP
MOV IP, #00H
; IP = 00H
MOV IE, #82H
; IE = 82H, TIMER0 INTERRUPT ENABLED
MOV TMOD, #01H ; TMOD = 01H, MODE1
MOV R6, #3CH
; SET WAKE-UP TIME FOR ERASE OPERATION, ABOUT 15 ms. DEPENDING
; ON USER'S SYSTEM CLOCK RATE.
MOV R7, #B0H
MOV TL0, R6
MOV TH0, R7
ERASE_P_4K:
MOV SFRCN, #22H
MOV TCON, #10H
MOV PCON, #01H
; SFRCN(C7H) = 22H ERASE 64K
; TCON = 10H, TR0 = 1, GO
; ENTER IDLE MODE (FOR ERASE OPERATION)
;*********************************************************************
;* BLANK CHECK
;*********************************************************************
MOV SFRCN, #0H ; READ 64KB AP Flash EPROM MODE
MOV SFRAH, #0H ; START ADDRESS = 0H
MOV SFRAL, #0H
MOV R6, #FBH
; SET TIMER FOR READ OPERATION, ABOUT 1.5 µS.
MOV R7, #FFH
MOV TL0, R6
MOV TH0, R7
BLANK_CHECK_LOOP:
SETB TR0
; ENABLE TIMER 0
MOV PCON, #01H ; ENTER IDLE MODE
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
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