#include "avr/io.h"
  #include "avr/interrupt.h"
  
  int main ( )
  {
    ddrb |= 0x82;    
    ddrc = 0x00;    
    ddrd = 0xff;    
  
    tcnt0 = -160;    
    tccr0 = 0x01;    
  
    tcnt1h = (-640)>>8;  
    tcnt1l = (-640);    
    tccr1a = 0x00;
    tccr1b = 0x01;
    timsk = (1<<toie0)|(1<<toie1); 
    sei ();         
  
    while (1)      
      portd = pinc;    
  }
  
  isr (timer0_ovf_vect)    
  {
    tcnt0 = -160;       
    portb ^= 0x02;       
  }
  
  isr (timer1_ovf_vect)    
  {
    tcnt1h = (-640)>>8;  
    tcnt1l = (-640);    
  
    portb ^= 0x80;    
  }