/* ------------------------------------------------------------
  Titel : Projekt Rauchmelder
 --------------------------------------------------------------
 Funktion :  Zähler & Tasterentprellung
 --------------------------------------------------------------
 Prozessor : ATmega8
 Taktfrequenz externer Quarz:    3,686411 MHz
 Sprache : C
 Datum : ©2010
 Version : 1.1
 ------------------------------------------------------------ */

#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>

void main (void)
{
  DDRB  = 0x03;
  PORTB = 0x00;
  PORTC = 0x00;
  DDRC  = 0x00;
  PORTD = 0x00;
  DDRD  = 0x00;
  ACSR  = 0b00001010;

  ISR (ANA_COMP_vect)                                 // Interrupt 0 Sub-Routine (ISR)
    {
     PORTB |= 0x02;
     _delay_ms(2);
     PORTB &=~ 0x02;
     _delay_ms(2);
    }
    while (1)
    {
      PORTB = 0x01;
      _delay_ms(1500);
      PORTB = 0x00;
      _delay_ms(4000);
      sei ();
    }
}