state.asm

如图4.3.1所示

	ORG 00H 
START:	JB P1.4,NEXT1           
	CLR P1.0 
	SJMP NEX1                
NEXT1:	SETB P1.0                
NEX1:	JB P1.5,NEXT2 
	CLR P1.1 
	SJMP NEX2 
NEXT2:	SETB P1.1 
NEX2:	JB P1.6,NEXT3 
	CLR P1.2 
	SJMP NEX3 
NEXT3:  SETB P1.2 
NEX3:	JB P1.7,NEXT4 
	CLR P1.3 
	SJMP NEX4 
NEXT4:	SETB P1.3 
NEX4:	SJMP START 
	END