ATMega128 Timer

#include <avr/io.h>

#include <avr/interrupt.h>

#include <stdint.h>

#define  PWMPORT1  PB5

#define PWMPORT2  PB6

// CTC Timer0 Variablen

volatile unsigned int millisekunde;

volatile unsigned int sekunde;

volatile unsigned int minute;

volatile unsigned int stunde;

int main(void)

{

/ Port richtungen bestimmen

DDRB |= (1<<PWMPORT1); // PWMPort OC1A auf Ausgang

DDRB |= (1<<PWMPORT2); // PWMPort OC1B auf Ausgang

// Timer1 PWM 10 Bit Phase Correct

TCCR1A = (1<<WGM11) | (1<<WGM10) | (1<<COM1B1) | (1<<COM1A1);

TCCR1B = (1<<CS10);

OCR1A = 0;

OCR1B = 0;

  while(1)

  {

  }

}

// Timer ISR CTC Overflow

ISR (TIMER0_OVF_vect) {

    millisekunde++;

  if (millisekunde == 1000) 

  {

    millisekunde = 0;

    sekunde++;

  }

  if (sekunde == 60)

  {

    sekunde = 0;

    minute++;

  }

  if (minute == 60)

  {

    minute = 0;

    stunde++;

  }

  if (stunde == 24)

  {

    stunde = 0;

  }

}