1602.asm

来自「单片机的实用程序代码」· 汇编 代码 · 共 80 行

ORG 00H
RS bit p2.5;定义写数据不是命令接口

RW bit P2.6

E bit P2.7
  org 0000h
main:
        MOV P0,#01H

        ACALL ENABLE

        MOV P0,#38H

        ACALL ENABLE

        MOV P0,#0cH

        ACALL ENABLE

        MOV P0,#06H

        ACALL ENABLE
        MOV P0,#0d0H

        ACALL ENABLE


    LOOP:
         MOV P0,#41H
        ACALL  WRITE
         ACALL DELAY1

        LJMP LOOP
ENABLE:CLR RS

CLR RW

CLR E

ACALL DELAY1

SETB E

RET

WRITE:setb rs

clr rw

clr e

call delay1

setb e

ret
DELAY1:mov r7,#255

d1:mov r6,#255

d2:djnz r6,d2

djnz r7,d1

ret
DELAY: MOV R5,#08H

L7:  MOV R4,#0FAH

L8:  DJNZ R4,L8

     DJNZ R5,L7

     RET