tp3r.asm

MCS-51单片机实验 39个实用实验和源码

        ORG     0000H
        LJMP    START
        ORG     0040H
START:
        MOV     SP,#60H
JD:     CPL     P3.5            ;P3.5取反
        LCALL   DELAY           ;延时
    	NOP
        SJMP    JD
DELAY:                          ;延时子程序(1秒)
        MOV     R0,#0AH
DELAY1: MOV     R1,#00H
DELAY2: MOV     R2,#0B2H
        DJNZ    R2,$
        DJNZ    R1,DELAY2
        DJNZ    R0,DELAY1
        RET
        END