51单片机中断

#include "reg51.h"
unsigned char s[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
unsigned char num=0;
sbit ex=P3^2;
void initte(){
	IT0=1;
	EX0=1;
	EA=1;
	//下降沿触发
	ex=1;
}

void show(){
	P2=s[num];
	if(num==10){
		num=0;
	}
	
}
void isr_ok() interrupt 0{
	num++;
}
void main(){
	initte();
	while(1){	
		show();
	}
}