W77E516 View Datasheet(PDF) - Winbond
Part Name
Description
Manufacturer
W77E516 Datasheet PDF : 85 Pages
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Preliminary W77E516
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
TA, #AAH
TA, #55H
CHPCON, #03H
TCON, #00H
TMOD, #01H
IP, #00H
IE, #82H
R6, #F0H
R7, #FFH
TL0, R6
TH0, R7
TCON, #10H
PCON, #01H
; CHPCON = 03H, ENABLE IN-SYSTEM PROGRAMMING.
; 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
MOV
MOV
MOV
MOV
TCON, #00H
IP, #00H
IE, #82H
TMOD,#01H
R6, #D0H
MOV
MOV
MOV
R7,#8AH
TL0,R6
TH0,R7
; TCON = 00H , TR = 0 TIM0 STOP
; IP = 00H
; IE = 82H, TIMER0 INTERRUPT ENABLED
; TMOD = 01H, MODE1
; SET WAKE-UP TIME FOR ERASE OPERATION, ABOUT 15 mS
DEPENDING ON USER'S SYSTEM CLOCK RATE.
ERASE_P_4K:
MOV SFRCN, #22H
MOV TCON, #10H
MOV PCON, #01H
; SFRCN = 22H, ERASE 64K APROM0
; SFRCN = A2H, ERASE 64K APROM1
; TCON = 10H, TR0 = 1,GO
; ENTER IDLE MODE (FOR ERASE OPERATION)
;*********************************************************************
;* BLANK CHECK
;*********************************************************************
MOV SFRCN, #0H
; SFRCN = 00H, READ 64KB APROM0
; SFRCN = 80H, READ 64KB APROM1
MOV SFRAH, #0H
; START ADDRESS = 0H
MOV SFRAL, #0H
MOV R6, #FDH
; SET TIMER FOR READ OPERATION, ABOUT 1.5 µS.
MOV R7, #FFH
MOV TL0, R6
MOV TH0, R7
BLANK_CHECK_LOOP:
SETB
MOV
MOV
CJNE
INC
MOV
JNZ
INC
MOV
CJNE
JMP
TR0
; ENABLE TIMER 0
PCON, #01H
; ENTER IDLE MODE
A, SFRFD
; READ ONE BYTE
A, #FFH, BLANK_CHECK_ERROR
SFRAL
; NEXT ADDRESS
A, SFRAL
BLANK_CHECK_LOOP
SFRAH
A, SFRAH
A, #0H,BLANK_CHECK_LOOP ; END ADDRESS = FFFFH
PROGRAM_64KROM
- 83 -
Publication Release Date: August 16, 2002
Revision A1
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