Hier nochmal uebersichtlicher, geht allerdings auch so nicht :/
Code:
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>

int main(void)
{
	TCCR2 = (1<<COM20) | (1<<WGM21) | (1<<CS22) | (1<<CS21) | (1<<CS20);
	OCR2 = 250;
	DDRB |= (1 << PB1);
	while(1){};
	//PORTB |= (1<<PB1);
}
[/code]