@avion23
Hier die Initlaisierung des PWM-Ausgangs des AtTiny461:
Code:
#warning Setup() Registereinstellungen prüfen!

// Timer1 Asynchronous Mode PLL Initialization - Page88
	PLLCSR  = (1 << PLLE);					// Enable PLL
	_delay_us(50);							// Wait 100µs for PLL to stabilize
	_delay_us(50);							// Split due to limits of _delay_us at frequency at 8mhz
	loop_until_bit_is_set(PLLCSR, PLOCK);	// Poll PLock until set 
	PLLCSR 	|= (1 << PCKE);					// Enable Asynchronous Mode

// PWM
/**************************************************************************************
 	Tiny15 - Originalvalues from Appnote:
		TCCR1A  = 0x81;         // define timer1 as 8-bit PWM  
		TIFR    = 0x80;         // clear counter1 overflow flag  
		TIMSK   = 0x80;         // enable counter1 overflow interrupt
		TCNT1   = 0x00;         // set counter1 to zero      
		TCCR1B  = 0x00;         // PWM disabLED

	Tiny461:
		OutPut OC1B, PB3 											PWM1B	= 1
		Fast PWM  													WGM11..0= 00
		Non-Inverting Compare Mode - Cleared on Compare Match 		COM1B1 	= 1
		Asynchrone Clocking Mode, Prescaler = 1  CLK = PCK  		CS10 	= 1
		8 bit from BOTTOM(0x00) to TOP(0xff) TOV1-Flag set on TOP 	OCR1C 	= 0xFF
***************************************************************************************/
	TCCR1A 	= (1 << PWM1B) | (1 << COM1B1);
	TCCR1B 	= (0 <<  CS13) | (0 <<  CS12) | (0 << CS11) | (1 << CS10);
	TCCR1D 	= (0 << WGM11) | (0 << WGM10);
	OCR1C 	= 0xff;

	//TIFR	= (1 << TOV1);  // clear counter1 overflow flag  
	//TIMSK	= (1 << TOIE1); // enable counter1 overflow interrupt
	TCNT1	= 0x00;         // set counter1 to zero      
	OCR1B	= 0x00;         // PWM disabLED

	DDRB	= (1 << PB3);	// PB3 as Output
TimerClockSource taktet intern mit 64Mhz.
Prescaler = 1
PWM mit 8 bit Auslösung.
Ausgabepin ist PB3
Ausgabefrequenz 250khz