; timer functions

TIMER0_INIT:

	; clock select, no prescaling
	ldi tmp1,0x01
	out TCCR0B,tmp1

	ret

TIMER0_INT_INIT:

	; overflow interrupt
	ldi tmp1,0x02
	out TIMSK,tmp1

	ret

TIMER0_INT_END:

	; overflow interrupt
	ldi tmp1,0x00
	out TIMSK,tmp1

	ret