Timer0 ISR Routine Not Triggering

Projects Programming
5

switched it up to this and it still isn't working

ISR(TIMER0_COMPA_vect)
{
	//toggle the pin high then low
	PORTC |= (1<<PORTC2);
	PORTC &= ~(1<<PORTC2);
	/*
	//Update the OCR0A value
	pos++;
	OCR0A = timer[pos];
	if(pos==3)
		pos=0;
	*/
}