单片机关于中断的具体C语言编程实现

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit d1=P1^0;
uchar num;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delay(uint z);
void main()
{
    EA=1;//开总中断
    EX0=1;//开外部中断0
    //IT0=1;
    TCON=0x01;
    wela=1;//11101010
    P0=0xea;
    wela=0;
    while(1)
    {
        for(num=0;num<16;num++)
            {
                d1=1;
                dula=1;
                P0=table[num];
                dula=0;
                delay(1000);   
            }
    }
}

void delay(uint z)
{
    uint x,y;
    for(x=z;x>0;x--)
        for(y=110;y>0;y--);   
}

void exter0() interrupt 0
{
    d1=0;   
}