void init_port();
void init_Timer();



int main()
{
  volatile long i;
  volatile int j = 0;
  init_port();
  init_Timer();
  Serial.begin(115200);
  while(1)
  {
    for(i=0 ; i<1000000 ; i++);
    Serial.println(j,DEC);
    j++;
  }



return 0;

}



void init_port()

{
  volatile char *dirf ;
  dirf = (volatile char *)0x30;
  *dirf = 0x01;

}


void init_Timer()
{
  volatile char *Timer1_TCCR1A;
  Timer1_TCCR1A = (volatile char *)0X80;


  volatile char *Timer1_TCCR1B; //TO SELECT CLOCK SOURCE AND PRESCALING
  Timer1_TCCR1B = (volatile char *)0X81;//ADDRESS OF TCCR1B OF TIMER1 (16 BIT)
  


  volatile char *Timer_TCNT1;
  Timer_TCNT1 = (volatile char *)0x84;
  

  volatile char *Timer_OCR1A;
  Timer_OCR1A = (volatile char *)0x88;

  volatile char *Timsk1; 
  Timsk1 = (volatile char *)0x6f;
  

  *Timer1_TCCR1A = 0;
  *Timer1_TCCR1B = 0;
  *Timer_TCNT1 = 0;
  
  *Timer_OCR1A = 60000;
  *Timer1_TCCR1B= 0X0C; //CTC MODE and prescale 256
  *Timsk1 = 0x02; //enable  to enable overflow interrupt
}

ISR(TIMER1_COMPA_vect)
{
  //volatile long i;
  
  volatile char *portoutf;
  portoutf = (volatile char *)0x31;
  *portoutf ^= 0x01;

}