m4-1.asm

来自「单片机的几个应用设计程序源代码」· 汇编 代码 · 共 45 行

	ORG	0H
	MOV	SP,#60H
START	JB	P3.0,$
	JB	P3.1,REV
	ANL	P1,#11110000B
FOR:	CLR	P1.3
	SETB	P1.0
	SETB	P1.1
	ACALL	SPEED
	CLR	P1.0
	SETB	P1.1
	SETB	P1.2
	ACALL	SPEED
	CLR	P1.1
	SETB	P1.2
	SETB	P1.3
	ACALL	SPEED
	CLR	P1.2
	SETB	P1.3
	SETB	P1.0
	ACALL	SPEED
	AJMP	START
REV:	CLR	P1.0
	SETB	P1.3
	ACALL	SPEED
	CLR	P1.3
	SETB	P1.2
	ACALL	SPEED
	CLR	P1.2
	SETB	P1.1
	ACALL	SPEED
	CLR	P1.1
	SETB	P1.0
	ACALL	SPEED
	AJMP	START
SPEED	MOV	A,P2
	ANL	A,#0FH
	MOV	R7,A
X2	MOV	R6,#20H
X1	MOV	R5,#90H
	DJNZ	R5,$
	DJNZ	R6,X1
	DJNZ	R7,X2
	RET
	END