信号灯控制.asm

信号灯控制的Keil、C51、Proteus仿真

			ORG		0030H
			MOV		SP,#60H
			MOV		P2,#00H
			MOV		P1,#0FH
START:		JNB		P1.0,A0
			JNB		P1.1,A1
			JNB		P1.2,A2
			JNB		P1.3,A3
			SJMP	START
A0:			MOV		DPTR,#TAB
			ACALL	DISP
			SJMP	START
A1:			MOV		DPTR,#TAB1
			ACALL	DISP
			SJMP	START
A2:			MOV		DPTR,#TAB2
			ACALL	DISP
			SJMP	START
A3:			MOV		DPTR,#TAB3
			ACALL	DISP
			SJMP	START
DISP:		CLR		A
			MOVC	A,@A+DPTR
			CJNE	A,#0AH,LOOP1
			RET
LOOP1:		MOV		P2,A
			MOV		R3,#20
			ACALL	DELAY
			INC		DPTR
			LJMP	DISP
DELAY:		MOV		R4,#20
D1:			MOV		R5,#248
			DJNZ	R5,$
			DJNZ	R4,D1
			DJNZ	R3,DELAY
			RET
TAB:		DB		01H,03H,07H,0FH,1FH,7FH,0FFH,0AH
TAB1:		DB		80H,0C0H,0E0H,0F0H,0F8H,0FCH,0FEH,0FFH,0AH
TAB2:		DB		0FFH,00H,0FFH,00H,0FFH,00H,0FFH,00H,0AH
TAB3:		DB		81H,0C3H,0E7H,0FFH,0E7H,0C3H,81H,0AH
			END