求助各位大大们

仿真

我在书上找的程序，代码如下：
#include
#define uchar unsigned char
#define uint unsigned int
***it M1=P1^0;
***it dula=P2^6;
***it wela=P2^7;
uchar i,num,num1,num2;
uchar shi,ge;
uchar code tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
void delay();
void display(uchar,uchar);
void main()
{
TMOD=0x11;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
EA=1;
ET0=1;
ET1=1;
TR0=1;
TR1=1;
while(1)
{
  display(shi,ge) ;
}
}
void display(uchar shi,uchar ge)
{
   dula=1;
P0=tab[shi];
dula=0;
P0=0xff;
delay();
wela=1;
P0=0xfe;
wela=0;
delay();
dula=1;
P0=tab[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay();
}
void delay()
{
uint p,q;
for(p=5;i>0;i--)
  for(q=110;i>0;i--);
}
void delayT0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
num1++;
if(num1==4)
  {
num1=0;
M1=~M1;
  }
}
void delayT1() interrupt 3
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
num2++;
if(num2==20)
  {
num2=0;
num++;
if(num==60)
num=0;
shi=num/10;
ge=num%10;
  }
}
但是我用protues仿真时，数码管一直是处于八段全亮的状态，求教各位大大，是怎么回事呢？？