ATtiny2313: Problem mit Fast-PWM an Timer1

#ifndef F_CPU

  #warning "F_CPU not defined"

  #define F_CPU 8000000UL

#endif

#include <inttypes.h> 

#include <avr/io.h>

#include <stdlib.h>

#include <util/delay.h>

int main() {

  DDRA = 0b11111111;

  DDRB = 0b11111111;  

  DDRD = 0b11111111;    

  TCCR0A |= (1<<COM0A1) | (1<<COM0B1) | (1<<WGM01) | (1<<WGM00);      //einstellungen für die PWM

  TCCR0B |= (1<<CS00);

  TCCR1A |= (1<<WGM12) | (1<<WGM10) | (1<<COM1A1) | (1<<COM1B1);      //einstellungen für die PWM

  TCCR1B |= (1<<CS10);

  int s = 0;                //zaehlvariable fuer sinus  

  unsigned char sinus[61] = {127,149,170,191,209,224,237,246,252,254,252,246,237,224,209,191,170,149,127,105,84,64,45,30,17,8,2,0,2,8,17,30,45,63,84,105,127,149,170,191,209,224,237,246,252,254,252,246,237,224,209,191,170,149,127,105,84,63,45,30,17};

  unsigned long int zeit = 20000;

  while(1){

    for(unsigned long int i = 0; i < zeit; i++) {

      _delay_us(1);

    }

    if(s == 36){

      s = 1;

    }

    else{

      s ++;

    }

     OCR0A = sinus[s];

     OCR0B = sinus[s + 12];

    OCR1B = sinus[s + 24];

  }

  return(0);

}