void timer_init_mega16(void)
{
	ICR1 = (1 << 11) - 1;/* 11 bit pwm */
	OCR1A = 0;
	TCCR1A = (1 << COM1A1) | (1 << CS10) | (1 << WGM11);/* fast pwm, non inverted, top in ICR1 */
	TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS10);/* fast pwm, top in ICR1,  */
	DDRD |= (1 << PD5);/* set pwm pin as output */
	TIMSK = 1 << TOIE1;/* interrupt at top */
}

void timer_init_tiny45(void)
{
	PLLCSR = 1 << PLLE;/* pll enable */
	delay_us(100);
	while(!(PLLCSR & (1 << PLOCK))) {;}/* wait for lock */
	PLLCSR |= 1 << PCKE;/* use pll */
	
	OCR1C = 0xff;
	
	/* output pin: OC1A = PB1 = 6 */
	OCR1A = 0;
	TCCR1 = (1 << PWM1A) | (1 << COM1A1) | (1 << CS10);/* pwm enable, non inverted, no prescaler */
	DDRB |= (1 << PB1);
	
	/* output pin: OC1B = PB5 = 3 */
	//OCR1B = 0;
	//TCCR1 = (1 << CS10);/* no prescaler */
	//GTCCR = (1 << PWM1B) | (1 << COM1B1);/* pwm enable, non inverted */
	//DDRB |= (1 << PB5);
	
	TIMSK = 1 << TOIE1;/* interrupt on overflow */
}