program to count the external events by using timers in 8051

//program to count the external events by using timers

#include<reg51.h>

sbit event=P3^5;

void main()

{

 event=1;

 TMOD=0x60;//timer1 as coutner in mode2

 TH1=0x00; //count 0

 while(1)

 {

  do

   {

    TR1=1;

                P1=TL1;

   }while(TF1==0);

   TR1=0;

   TF1=0;

 }

}