Hallo raid_ox,

vermutlich sollte es so gehen...
(dies ist ein ausschnitt aus dem Yeti Init Funktion, der funktioniert gleich wie Asuro)

Code:
//------------------------------------------------------------//
	//  Init USART for RS232 communication                        //
	//------------------------------------------------------------//
	// Init Atmega USART for RS232 communication (connected to Yeti InfraRed transmitter/receiver)
	// default init
	UCSRA=0x00;
	// default init
	UCSRB=0x00;
	// select UCSRC, no parity, 1 stop bit, 8 databits per character
	UCSRC=(1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);
	// select baudrate 2400bps when using 8.0000MHz oscillator (see table 62 in pdf)
	UBRRL=0xCF;

	//------------------------------------------------------------//
	//  Init Timer2, used for generating RS232 IR carrier signal  //
	//------------------------------------------------------------//
	//  prepare 36kHz for IR - Communication
	// WGM21: waveform generation mode 2 => CTC mode => TOP = OCR2
	//        (Only counting up until value OCR2 (TOP) reached)
	// COM20: Toggle OC2 on Compare Match
	// CS20:  No prescaling (so Timer2 clock frequency = 8MHz = 125ns)
	TCCR2=(1<<WGM21)|(1<<COM20)|(1<<CS20);

	// 0x6E = 110, so frequency is 110 * 125ns = 13.75us = 72.727KHz
	// as output is toggled, the real frequency is 72.727KHz / 2 = appr. 36KHz
	OCR2=0x6E;

	//------------------------------------------------------------//
	//  Set 36KHz carrier pin as output
	//------------------------------------------------------------//
	// set carrier signal pin PB3/(MOSI/OC2) as output
 	DDRB|=(1<<PB3);
Gruss,

Henk