ORG		0000H
		AJMP	START1
		ORG		0030H
SAME	EQU		4EH
START1:	MOV		P1,#00H			;無(wú)輸入時(shí)無(wú)輸出
START:	MOV		A,P3			;讀P3口數(shù)據(jù)
		ANL		A,#1FH			;取用P3口的低五位數(shù)據(jù)
		CJNE	A,#1FH,SHIY		;對(duì)P3口低五位數(shù)據(jù)進(jìn)行判斷
		AJMP	START1
SHIY:	MOV		SAME,A
		LCALL	YS				;延時(shí)
		MOV		A,P3			;讀P3口的數(shù)據(jù)
		ANL		A,#1FH			;取用P3口的低五位數(shù)據(jù)
		CJNE	A,#1FH,SHIY1	;對(duì)P3口的低五位數(shù)據(jù)進(jìn)行判斷
		AJMP	START1			;開關(guān)沒有動(dòng)作時(shí)無(wú)輸出
SHIY1:	CJNE	A,SAME,START1
		CJNE	A,#17H,NEXT1	;P3.3=0時(shí)進(jìn)入左轉(zhuǎn)分支
		AJMP	LEFT
NEXT1:	CJNE	A,#0FH,NEXT2	;P3.4=0時(shí)進(jìn)入右轉(zhuǎn)分支
		AJMP	RIGHT
NEXT2:	CJNE	A,#1DH,NEXT3	;P3.1=0時(shí)進(jìn)入緊急分支
		AJMP	EARGE
NEXT3:	CJNE	A,#1EH,NEXT4	;P3.0=0時(shí)進(jìn)入剎車分支
		AJMP	BRAKE
NEXT4:	CJNE	A,#16H,NEXT5	;P3.0=P3.3=0時(shí)進(jìn)入左轉(zhuǎn)剎車分支
		AJMP	LEBR
NEXT5:	CJNE	A,#0EH,NEXT6	;P3.0=P3.4=0時(shí)進(jìn)入右轉(zhuǎn)剎車分支
		AJMP	RIBR
NEXT6:	CJNE	A,#1CH,NEXT7	;P3.0=P3.1=0時(shí)進(jìn)入緊急剎車分支
		AJMP	BRER
NEXT7:	CJNE	A,#14H,NEXT8	;P3.0=P3.1=P3.3=0時(shí)進(jìn)入左轉(zhuǎn)緊急剎車分支
		AJMP	LBE
NEXT8:	CJNE	A,#0CH,NEXT9	;P3.0=P3.1=P3.4=0時(shí)進(jìn)入右轉(zhuǎn)緊急剎車分支
		AJMP	RBE
NEXT9:	CJNE	A,#1BH,NEXT10	;P3.2=0時(shí)進(jìn)入停靠分支
		AJMP	STOP
NEXT10:	AJMP	ERROR			;其他情況進(jìn)入錯(cuò)誤分支
LEFT:	MOV		P1,#2AH			;左轉(zhuǎn)分支
		LCALL	Y1s
		MOV		P1,#00H
		LCALL	Y1s
		AJMP	START
RIGHT:	MOV		P1,#54H			;右轉(zhuǎn)分支
		LCALL	Y1s
		MOV		P1,#00H
		LCALL	Y1s
		AJMP	START
EARGE:	MOV		P1,#7FH			;緊急分支
		LCALL	Y1s
		MOV		P1,#00H
		LCALL	Y1s
		AJMP	START
BRAKE:	MOV		P1,#60H			;剎車分支
		AJMP	START
LEBR:	MOV		P1,#6AH			;左轉(zhuǎn)剎車分支
		LCALL	Y1s
		MOV		P1,#40H
		LCALL	Y1s
		AJMP	START
RIBR:	MOV		P1,#6AH			;右轉(zhuǎn)剎車分支
		LCALL	Y1s
		MOV		P1,#40H
		LCALL	Y1s
		AJMP	START
BRER:	MOV		P1,#7EH			;緊急剎車分支
		LCALL	Y1s
		MOV		P1,#60H
		LCALL	Y1s
		AJMP	START
LBE:	MOV		P1,#7EH			;左轉(zhuǎn)緊急剎車分支
		LCALL	Y1s
		MOV		P1,#40H
		LCALL	Y1s
		AJMP	START
RBE:	MOV		P1,#7EH			;右轉(zhuǎn)緊急剎車分支
		LCALL	Y1s
		MOV		P1,#20H
		LCALL	Y1s
		AJMP	START
STOP:	MOV		P1,#66H			;停靠分支
		LCALL	Y100ms
		MOV		P1,#00H
		LCALL	Y100ms
		AJMP	START
ERROR:	MOV		P1,#80H			;錯(cuò)誤分支
		LCALL	Y1s
		MOV		P1,#00H
		LCALL	Y1s
		AJMP	START
YS:		MOV		R7,#20H			;延時(shí)
YS0:	MOV		R6,#0FFH
YS1:	DJNZ	R6,YS1
		DJNZ	R7,YS0
		RET
Y1s:	MOV		R7,#04H			;延時(shí)
Y1s1:	MOV		R6,#0FFH
Y1s2:	MOV		R5,#0FFH
		DJNZ	R5,$
		DJNZ	R6,Y1s2
		DJNZ	R7,Y1s1
		RET
Y100ms:	MOV		R7,#66H			;延時(shí)
Y100ms1:MOV		R6,#0FFH
Y100ms2:DJNZ	R6, Y100ms2
		DJNZ	R7, Y100ms1
		RET
		END