text1.asm

来自「用到Proteus软件来仿真51单片机」· 汇编 代码 · 共 22 行

FLAG			BIT 00H
				ORG 00H
START:			JB P1.7,START
				JNB FLAG,NEXT
				MOV R2,#200
DV:				CPL P1.0
				LCALL DELY500
				LCALL DELY500
				DJNZ R2,DV
				CPL FLAG
NEXT:			MOV R2,#200
DV1:			CPL P1.0
				LCALL DELY500
				DJNZ R2,DV1
				CPL FLAG
				SJMP START
DELY500:		MOV R7,#250
LOOP:			NOP
				DJNZ R7,LOOP
				RET
				END