program to calculating the delays by using timers in 8051

//program to calculating the delays by using timers

#include<reg51.h>

void delay(void);

void main()

{

 while(1)

  {

    P1=0x55;

                delay();

                P1=0xAA;

                delay();

  }

}

void delay()

{

 TMOD=0x01;

 TH1=0x35;

 TL1=0xFF;

 TR0=1;

 while(TF0==0);

 TR0=0;

 TF0=0;

}