#include<reg51.h>
timer0_over() interrupt 1
{
	TR0=0;	 //stop timer
	TF0=0;//timer overflow set to 0
	TH0=0xd8;	 //set timerhigh delay for 10msec
	TL0=0xf0;  //set timerlow
	P1=~P1;
	TR0=1;	  //start timer
}

main()
{
	P1=0x00;
	IE|=0x82;//EA=1,ES=0 ET0=1 everything else is 0
	TR0=0;	 //stop timer
	TF0=0;			  //set timer overflow to 0
	TMOD=0x1;		   //set timer mode
	TH0=0xd8;	   //set timerhigh delay for 10msec
	TL0=0xf0;  //set timerlow
	TR0=1;			 //start timer
	while(1);
}