Code:
#include <avr/io.h>
#include <avr/signal.h>
#include <avr/interrupt.h>


SIGNAL (SIG_OUTPUT_COMPARE1B)
{
PORTB ^= 0xFF;

}


int main (void)
{
TIMSK |= 0b00001000;
TCCR1B|= 0b00001010;

DDRB = 0xFF;
OCR1B = 303;
sei();
 
while(1)
{

}
return 0;
}
was habe iich hier falsch gemacht?