/*******************************************************************************

*       																					          *
* 4位不帶小數(shù)點(diǎn)的頻率計(jì)                                              	       *
*                                                                              *
********************************************************************************
*  51測(cè)試網(wǎng)論壇例程                 版權(quán)所有轉(zhuǎn)載注明版權(quán)連接WWW.8951.com       *
*******************************************************************************/
#include <AT89X51.H>
#include <stdio.h>
int value=0,n=0;
int n,n1,n2,n3,n4;
int LEDData [] = { 0x28, 0x7E, 0xA2, 0x62, 0x74, 0x61, 0x21, 0x7A, 0x20, 0x60};
void delay(short i);
void initial(void);
void display(void);
main ()
{
initial();
   while(1)
   {
      if(n==100)
    {
      display();  
   n=0;
   value=0;
    }
   }
   
}
  void initial(void)//定時(shí)器計(jì)數(shù)器初始化
{
IE=0x8b;
TCON=0x01;
TMOD=0x11;
TH0=0xD8;//T0作為定時(shí)器初始化0.01秒中一次斷
TL0=0xF0;
TH1=0XFF;//T1產(chǎn)生625HZ
TL1=0X60;
TR0=1;
TR1=1;
}
void delay(short i)
{
     int j=0;
  int k=0;
  k=i*2;
  while(j<k) j++;

}

void extern0_ISR () interrupt 0 //INT0外部脈沖中斷
{
  EX0=0;
  value++;
  EX0=1;
}

void timer0_ISR  () interrupt 1  //定時(shí)器每0.01秒中斷一次T0
  {  
   n++;
    TH0=0xD8;
    TL0=0xF0;


  }
void timer1_ISR  () interrupt 3//T1625hz
{
P1=P1^0xc0;
TH1=0XFF;//T1產(chǎn)生3125HZ
TL1=0X60;
}
void display(void)
{
    
     n4=value/1000;
     n3=(value-n4*1000)/100;
     n2=(value-n4*1000-100*n3)/10;
     n1=value-n4*1000-100*n3-10*n2;
while(1)
   {
  P2=0x3f;
     P0=LEDData [n1];     
  delay(50);
     P2=0x5f;
     P0=LEDData [n2];
  delay(50);
     P2=0x6f;
     P0=LEDData [n3];    
  delay(50);
     P2=0xf7;
     P0=LEDData [n4];  
     delay(50);
  P2=0xff;
    }
}