text1.asm

霹雳灯！ 只有一个led亮

ORG 0
START: MOV A,#0FEH
LOOP:  MOV R0,#7
LOOPL: MOV P2,A
       RL A
       ACALL DELAY
	DJNZ R0,LOOPL

	MOV R0,#7
LOOPR:	MOV P2,A
	RR A
	ACALL DELAY
	DJNZ R0,LOOPR
	JMP LOOP

DELAY:	MOV R7,#200
D1:	MOV R6,#250
	DJNZ R6,$
	DJNZ R7,D1
	RET
	END