[求助]我寫的動態(tài)顯示怎么速度上不去啊，高手看看

RT，我是初學(xué)者，學(xué)到數(shù)碼管動態(tài)顯示，我寫了如下程序，按理說應(yīng)該分辨不清楚的吧，而現(xiàn)在還是一個(gè)數(shù)一個(gè)數(shù)的蹦，蹦的也還不算慢，哪兒寫錯(cuò)了嘛，虛心求教

#include<reg52.h>
#define uchar unsigned char
sbit duan=P2^6;
sbit wei=P2^7;
uchar code du[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07};
uchar code we[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
uchar num,num1;
void main()
{ 
 TMOD=1;
 TH0=(65536-1)/256;
 TL0=(65536-1)%256;
 TR0=1;
 while(1)
 {
  if(TF0==1)
  {
   TF0=0;
   num++;
  }
  if(num==1)
  {
   num=0;
   wei=1;
   P0=we[num1];
   wei=0;
   duan=1;
   P0=du[num1];
   duan=0;
   num1++;
   if(num1==8)
   {num1=0;}

  }
 }

}