数码管动态显示程序

#include<reg51.h>
unsigned char i,j;
unsigned char DuanMa[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned WeiMa[]={0x0e,0x0d,0x0b,0x07};
unsigned XianShi[]={0,2,3,4};
unsigned flag;
void main()
{
  
    i=j=0;
    TMOD=0x01;
    TH0=(65536-5000)/256;
    TL0=(65536-5000)%256;
 EA=1;
 ET0=1;
    TR0=1;
 
    while(1)
    {
    if(flag==1)
       {
       flag=0;  
    if(i==4)i=0;
       P0=DuanMa[XianShi[i]];
    i++;
    if(j==4)j=0;
       P2=WeiMa[j];
    j++;
    }
  }
}
void timer0() interrupt 1
{ 
    TH0=(65536-5000)/256;
    TL0=(65536-5000)%256;
 flag++;
}