[求助]一個(gè)中斷實(shí)驗(yàn)做不出想要的效果

P0口控制LED和數(shù)碼管，我想要數(shù)碼管在閃，當(dāng)我按下中斷后，LED燈亮。現(xiàn)在按下中斷后LED燈亮了。但回不去讓數(shù)碼管亮。LED燈在那里亂閃？這代碼該怎么改？

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit SJ=P1^4;

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;
 EX0=1;

 wela=1;//11101010
 P0=0xea;
 wela=0;
 while(1)
 {
  for(num=0;num<16;num++)
   {
    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 zd() interrupt 0{

 SJ=0;
    wela=1;//11101010
 P0=0xff;
 wela=0;
 P0=0xfe;
}