led亮灭.asm

包含单片机开发的入门程序

ORG  0000H
START:  MOV   P0,#0FH
	ACALL  DELAY
	MOV   P0,#0F0H
	ACALL  DELAY
	SJMP   START
DELAY:  MOV  R3,#0FFH
DEL2:   MOV R4,#0FFH
DEL1:   NOP
	DJNZ R4,DEL1
	DJNZ R3,DEL2
	RET
	END