INT0中斷不能執(zhí)行51hei-5板 請各位指教

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit DUAN=P2^6;
sbit WEI=P2^7;
sbit D1=P0^0;
sbit SJ=P1^4;
uchar code temp[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
void delay(uint z)
{
     uint x,y;
     for(x=100;x>0;x--)
       for(y=z;y>0;y--);
}
main()
{      
      uint i;
      SJ=0;
      EA=1;
       EX0=1;
      IT0=0;
      WEI=1;
      P0=0;
      WEI=0;
       for(i=0;i<10;i++)
              {
                  P0=temp;
                  delay(600);
                }
                        
}
      
void exter0() interrupt 0 using 0
{
     D1=0;
}