Code:
ISR(SIG_OUTPUT_COMPARE0)
{
	OCR0 = 125;
}

int main()
{
	sei();
//	DDRD = (1<<PB3); 
// Vertippt
        DDRB = (1<<PB3);	
        TIMSK = (1<<OCIE0);
	TCCR0 = (1<<WGM00) || (1<<WGM01) || (1<<COM00) || (1<<COM01) || (1<<CS00)||(1<<CS01);
	OCR0 = 125;
	while(1);
	return 0;
}
aber ich bekomme kein signal an PB3/oc0