下面是我从0到1000计数，可是为什么我记到6就错了呢，我是哪里错了啊，我是新手水平不高的   #include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
uchar aa,unmp,qian,bai,shi,ge;
void dingshi();
void dealy(uint z);
void xs(uchar qian,uchar bai,uchar shi,uchar ge);
uchar code table[]={0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,
0x07,0x7f,0x6f}; void main()
{
 dingshi();
  while(1)
   {
   if(aa==20)
   {
     aa=0;
    unmp++;
    if(unmp==1000)
    unmp=0;
    qian=unmp/1000;
    bai=unmp/100%10;
    shi=unmp/10%10;
    ge=unmp%10;    }
  xs(qian,bai,shi,ge);
 }
}
void dingshi()
{
 EA=1;
 ET0=1;
 TMOD=0x01;
 TR0=1;
 TH0=(65536-50000)/256;
 TL0=(65536-50000)%256;
 unmp=0;
}
void et0() interrupt 1
{
 TH0=(65536-50000)/256;
 TL0=(65536-50000)%256;
 aa++;
}
void xs(uchar qian,uchar bai,uchar shi,uchar ge)
{
 P1=table[qian];
 P0=0xf7;
 dealy(5);  P1=table[bai];
 P0=0xfb;
 dealy(5);  P1=table[shi];
 P0=0xfd;
 dealy(5);  P1=table[ge];
 P0=0xfe;
 dealy(5); }
void dealy(uint z)
{
 uint x,y;
 for(x=200;x>0;x--)
 for(y=z;y>0;y--); }
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