#include <reg51.h>
//31．            6位數(shù)顯頻率計數(shù)器
unsigned char code dispbit[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; 
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66, 
                               0x6d,0x7d,0x07,0x7f,0x6f,0x00,0x40}; 
unsigned char dispbuf[8]={0,0,0,0,0,0,10,10}; 
unsigned char temp[8]; 
unsigned char dispcount; 
unsigned char T0count; 
unsigned char timecount; 
bit flag; 
unsigned long x; 
  
void main(void) 
{ 
  unsigned char i; 
  
  TMOD=0x15; 
  TH0=0; 
  TL0=0; 
  TH1=(65536-4000)/256; 
  TL1=(65536-4000)%256; 
  TR1=1; 
  TR0=1; 
  ET0=1; 
  ET1=1; 
  EA=1; 
  
  while(1) 
   { 
     if(flag==1) 
       { 
         flag=0; 
         x=T0count*65536+TH0*256+TL0; 
         for(i=0;i<8;i++) 
           { 
             temp[i]=0; 
           } 
         i=0; 
         while(x/10) 
           { 
             temp[i]=x%10; 
             x=x/10; 
             i++; 
           } 
         temp[i]=x; 
         for(i=0;i<6;i++) 
           { 
             dispbuf[i]=temp[i]; 
           } 
         timecount=0; 
         T0count=0; 
         TH0=0; 
         TL0=0; 
         TR0=1; 
       } 
   } 
} 
  
void t0(void) interrupt 1 using 0 
{ 
  T0count++; 
} 
  
void t1(void) interrupt 3 using 0 
{ 
  TH1=(65536-4000)/256; 
  TL1=(65536-4000)%256; 
  timecount++; 
  if(timecount==250) 
    { 
      TR0=0; 
      timecount=0; 
      flag=1; 
    } 
  P0=dispcode[dispbuf[dispcount]]; 
  P2=dispbit[dispcount]; 
  dispcount++; 
  if(dispcount==8) 
    { 
      dispcount=0; 
    } 
}