; timer functions

TIMER1_INIT_NP:

	; clock select, no prescaler
	in tmp1,TCCR1B
	cbr tmp1,(1<<CS12)
	cbr tmp1,(1<<CS11)
	sbr tmp1,(1<<CS10)
	out TCCR1B,tmp1

	ret

TIMER1_INIT_8:

	; clock select, prescaler 64
	in tmp1,TCCR1B
	cbr tmp1,(1<<CS12)
	sbr tmp1,(1<<CS11)
	cbr tmp1,(1<<CS10)
	out TCCR1B,tmp1

	ret

TIMER1_INIT_64:

	; clock select, prescaler 64
	in tmp1,TCCR1B
	cbr tmp1,(1<<CS12)
	sbr tmp1,(1<<CS11)
	sbr tmp1,(1<<CS10)
	out TCCR1B,tmp1

	ret

TIMER1_INIT_256:

	; clock select, prescaler 256
	in tmp1,TCCR1B
	sbr tmp1,(1<<CS12)
	cbr tmp1,(1<<CS11)
	cbr tmp1,(1<<CS10)
	out TCCR1B,tmp1

	ret

TIMER1_INIT_1024:

	; clock select, prescaler 1024
	in tmp1,TCCR1B
	sbr tmp1,(1<<CS12)
	cbr tmp1,(1<<CS11)
	sbr tmp1,(1<<CS10)
	out TCCR1B,tmp1

	ret

TIMER1_INT_ENABLE:

	; overflow interrupt enable
	in tmp1,TIMSK
	sbr tmp1,(1<<TOIE1)
	out TIMSK,tmp1

	ret

TIMER1_INT_DISABLE:

	; overflow interrupt disable
	in tmp1,TIMSK
	cbr tmp1,(1<<TOIE1)
	out TIMSK,tmp1

	ret