s16-3.asm

51单片机程序教程

	ORG 0000H
	LJMP MAIN
	ORG 030H
MAIN:	MOV P3,# 0F9H
	ACALL DEL1mS
	MOV P3,#0FFH
	MOV P2,# 0A4H
	ACALL DEL1mS
	MOV P2,#0FFH
	MOV P1,#0B0H
	ACALL DEL1mS
	MOV P1,#0FFH
	MOV P0,#99H
	ACALL DEL1mS
	MOV P0,#0FFH
	AJMP MAIN
DEL1mS:MOV R6,#02H
DEL1:	MOV R7,#0FFH
	DJNZ R7,$
	DJNZ R6,DEL1
	RET
	END