#include <iom88.h>

#pragma vector=TIMER0_OVF_vect
__interrupt void ISR_TOV0 (void)
{
  PORTC = 0xFF;
}

void main()
{ 
  TCCR0A = 1<<CS01;
  TIFR0 = 1<<TOV0;
  TIMSK0 = 1<<TOIE0;

  DDRC = 0xFF;

  while(1);
}