Interrupt Probleme

#include <avr/io.h>

#include <avr/interrupt.h>

int main(void)

{

  DDRC= 0xFF;

  PORTC = 0x00;

  TCCR1B= (1<<WGM12) | (5<<CS10) ;

  TIMSK1= (1<<OCIE1A) | (1<<ICIE1);

  OCR1A = 15000;

  TCCR0A = (2<<WGM00);

  TCCR0B = (5<<CS00);

  OCR0A = 250;

  TIMSK0 = (1<<OCIE0A);

  while(1)

    PORTC |= 0x08;

  ;

}

ISR (TIMER1_COMPA_vect)

{

PORTC |= 0x01;

PORTC &= 0xFE;

}

ISR (TIMER0_COMPA_vect)

{

PORTC |= 0x02;

PORTC |= 0xFD;

}