s13-2.asm

手把手教你学单片机（第2版）实验程序

	ORG 0000H
	LJMP MAIN
	ORG 0003H
	LJMP 0100H
	ORG 030H
MAIN:	MOV A,#0FFH
	SETB EA
	SETB EX0
LOOP:	MOV P0,A
	LCALL DEL
	AJMP LOOP
DEL: 	MOV R7,#0FFH
DEL1:	MOV R6,#0FFH
DEL2:	DJNZ R6,DEL2
     	DJNZ R7,DEL1
     	RET
	ORG 0100H
	MOV A,P1
	CPL A
	MOV P0,A
	RETI
	END