W77E516 查看數據表（PDF） - Winbond

零件编号

产品描述 (功能)

生产厂家

W77E516

8-BIT MICROCONTROLLER

Winbond 

Preliminary W77E516

15. APPLICATION NOTE

In-system Programming Software Examples

This application note illustrates the in-system programmability of the Winbond W77E516 MTP-ROM

microcontroller. In this example, microcontroller will boot from 64 KB APROM bank and waiting for a

key to enter in-system programming mode for re-programming the contents of 64 KB APROM.

While entering in-system programming mode, microcontroller executes the loader program in 4KB

LDROM bank. The loader program erases the 64 KB APROM then reads the new code data from

external SRAM buffer (or through other interfaces) to update the 64KB APROM.

EXAMPLE 1:

;*******************************************************************************************************************

;* Example of 64K APROM program: Program will scan the P1.0. if P1.0 = 0, enters in-system

;* programming mode for updating the content of APROM code else executes the current ROM code.

;* 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

0H

LJMP 100H

; JUMP TO MAIN PROGRAM

;************************************************************************

;* TIMER0 SERVICE VECTOR ORG = 000BH

;************************************************************************

ORG

00BH

CLR TR0

; TR0 = 0, STOP TIMER0

MOV TL0,R6

MOV TH0,R7

RETI

;************************************************************************

;* 64K APROM MAIN PROGRAM

;************************************************************************

ORG 100H

MAIN_64K:

MOV

ANL

CJNE

JMP

A,P1

; SCAN P1.0

A,#01H

A,#01H,PROGRAM_64K ; IF P1.0 = 0, ENTER IN-SYSTEM PROGRAMMING MODE

NORMAL_MODE

PROGRAM_64:

MOV TA,#AAH

MOV TA,#55H

MOV CHPCON,#03H

; CHPCON register is written protect by TA register.

; CHPCON = 03H, ENTER IN-SYSTEM PROGRAMMING MODE

- 81 -

Publication Release Date: August 16, 2002

Revision A1

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