W79E201 Datasheet, PDF (83/87 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E201
EXAMPLE 2:
;*****************************************************************************************************************************
;* Example of 4KB LD Flash EPROM program: This loader program will erase the 64KB AP Flash EPROM first,
;* then reads the new code from external SRAM and program them into 64KB AP Flash EPROM.
;* XTAL = 24 MHz
;*****************************************************************************************************************************
.chip 8052
.RAMCHK OFF
.symbols
CHPCON
TA
SFRAL
SFRAH
SFRFD
SFRCN
EQU
EQU
EQU
EQU
EQU
EQU
9FH
C7H
ACH
ADH
AEH
AFH
ORG 000H
LJMP 100H
; JUMP TO MAIN PROGRAM
;************************************************************************
;* 1. TIMER0 SERVICE VECTOR ORG = 0BH
;************************************************************************
ORG 000BH
CLR TR0
; TR0 = 0, STOP TIMER0
MOV TL0, R6
MOV TH0, R7
RETI
;************************************************************************
;* 4KB LD Flash EPROM MAIN PROGRAM
;************************************************************************
ORG 100H
MAIN_4K:
MOV TA,#AAH
MOV TA,#55H
MOV CHPCON,#03H ; CHPCON = 03H, ENABLE IN-SYSTEM PROGRAMMING.
MOV SFRCN,#0H
MOV TCON,#00H ; TCON = 00H, TR = 0 TIMER0 STOP
MOV TMOD,#01H ; TMOD = 01H, SET TIMER0 A 16BIT TIMER
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Publication Release Date: December 16, 2004
Revision A2