W78LE58/W78L058A

- 30 -

MOV R6,#F0H

; TL0 = F0H

MOV R7,#FFH

; TH0 = FFH

MOV TL0,R6

MOV TH0,R7

MOV TMOD,#01H

; TMOD = 01H, SET TIMER0 A 16-BIT TIMER

MOV TCON,#10H

; TCON = 10H, TR0 = 1,GO

MOV PCON,#01H

; ENTER IDLE MODE FOR LAUNCHING THE IN-SYSTEM

; PROGRAMMING

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

;* Normal mode 32KB APROM program: depending user's application

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

NORMAL_MODE:

.

; User's application program

.

.

.

EXAMPLE 2:

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

Example of 4 KB LDROM program: This loader program will erase the 32KB APROM first, then reads the new ;*

code from external SRAM and program them into 32 KB APROM bank. XTAL = 16 MHz

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

.chip 8052

.RAMCHK OFF

.symbols

CHPCON

EQU

BFH

CHPENR

EQU

F6H

SFRAL

EQU

C4H

SFRAH

EQU

C5H

SFRFD

EQU

C6H

SFRCN

EQU

C7H

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 LDROM MAIN PROGRAM

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

ORG 100H