按键移动.asm

刚学时编的小程序

		ORG 0000H
		AJMP MAIN
MAIN:	MOV R0,#7H
		MOV A,#0FEH
		MOV P1,A
/*LOOP:	
		JB P3.0,LOOP2
		ACALL RUNR
		
LOOP2:	
		JB P3.1,LOOP
		ACALL RUNL
		AJMP LOOP  */
		
RUNR:	RR A
		MOV P1,A
		ACALL DELAY
		DJNZ R0,RUNR
		MOV R0,#8H
	;	RET

RUNL:	RL A
		MOV P1,A
		ACALL DELAY
		DJNZ R0,RUNL
		MOV R0,#8H
	;	RET

		AJMP RUNR

DELAY:MOV R2,#20H
ASD:	MOV R3,#50H
AED:	MOV R4,#50H
		DJNZ R4,$
		DJNZ R3,AED
		DJNZ R2,ASD
		RET

		END