#include<avr/io.h>
#include<util/delay_basic.h>
#include<avr/iom32.h>
#include<avr/interrupt.h>
volatile uint8_t b;
void main()
{
DDRB|=(1<<PB3);
TCCR0|=(1<<WGM00)|(1<<COM01)|(1<<CS00);
TCNT0=0;
while(1)
{
OCR0=255;
_delay_loop_2(9900);
OCR0=0;
_delay_loop_2(9900);
}
}