1620b.asm

1602液晶测试程序, RS EQU P3.7 RW EQU P3.6 E EQU P3.5

RS      EQU P2.0
RW      EQU P2.1
E       EQU P2.7
        ORG 0000H
        LJMP MAIN
        ORG 0100H
MAIN:   MOV P2,#0FFH

        MOV P1,#01H ;清除屏幕
        
;送命令
        CLR RS
        CLR RW
        SETB E
        ACALL DELAY
        CLR E
        LJMP 
DELAY: ;延时子程序
       MOV R7,#255
D1:    MOV R6,#255
D2:    DJNZ R6,D2
       DJNZ R7,D1
       RET