zhongduan.asm

能显示时间

ORG 0000H
	AJMP MAIN
ORG 0003H
	AJMP INSER
ORG 0030H
MAIN:
	SETB EX0
	SETB IT0
	SETB EA
HERE: 
	SJMP HERE
ORG 0200H
INSER:
	MOV A,#0F0H
	MOV P1,A
	MOV A,P1
	SWAP A
	MOV P1,A
RETI
END