#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
 
 
#ifndef OCR1A
#define OCR1A OCR1  
#endif
 
#ifndef WGM12
#define WGM12 CTC1 
#endif
 
#ifndef PINC
#define KEY_INPUT   PIND    
#else
#define KEY_INPUT   PINC    
#endif
#define LED_DIR     DDRB
 

#define XTAL        11059008L   
 
#define DEBOUNCE    256L        
 
#define uchar unsigned char
#define uint unsigned int
 
uchar prescaler;
uchar volatile second;         
 
 
SIGNAL (SIG_OUTPUT_COMPARE1A)
{
 
#if XTAL % DEBOUNCE                     
  OCR1A = XTAL / DEBOUNCE - 1;      
#endif
  if( --prescaler == 0 ){
    prescaler = (uchar)DEBOUNCE;
    second++;              
#if XTAL % DEBOUNCE         
    OCR1A = XTAL / DEBOUNCE + XTAL % DEBOUNCE - 1; 
#endif
  }
}
 
 
int main( void )
{
	
  DDRD |= (1 << PD0);								// PD0 als Ausgang festlegen//
  int sek = 0;
  
  
  
  while(1)               
 
  TCCR1B = (1<<WGM12) | (1<<CS10);                     
  OCR1A = XTAL / DEBOUNCE - 1;          
  TCNT1 = 0;                            
  second = 0;
  prescaler = (uchar)DEBOUNCE;          
  TIMSK = 1<<OCIE1A;                                       
                                        
  sei();
  
 
 
  for(;;)
  {
    if( second == 60 )
    {
		second = 0;
		sek = sek +1;								// sek zählt die Sekunden //
	}
	
  }
  
	if (sek == 5) PORTD |= (1 << PD0);						// Nach 5 Sekunden soll Ausgang PD0 aktiviert werden //
	
	  
}