void timer0SetPrescaler(u08 prescale)
{
	// set prescaler on timer 0
	outb(TCCR0, (inb(TCCR0) & ~TIMER_PRESCALE_MASK) | prescale);
}

void timer1SetPrescaler(u08 prescale)
{
	// set prescaler on timer 1
	outb(TCCR1B, (inb(TCCR1B) & ~TIMER_PRESCALE_MASK) | prescale);
}

void timer2SetPrescaler(u08 prescale)
{
	// set prescaler on timer 2
	outb(TCCR2, (inb(TCCR2) & ~TIMER_PRESCALE_MASK) | prescale);
}

void timer3SetPrescaler(u08 prescale)
{
	// set prescaler on timer 2
	outb(TCCR3B, (inb(TCCR3B) & ~TIMER_PRESCALE_MASK) | prescale);
}