void init_port();
void init_timer();

void setup() {
  // put your setup code here, to run once:
   volatile long i;
   long  j=0;
   init_port();
   init_timer();
   Serial.begin(9600);
   while(1)
   {
      for(i=0; i<100000;i++);
      Serial.println(j,DEC);
       j++; 
   }
}
void init_timer(){
  volatile char *Timer_TCCR1A=0x80;
  volatile char *Timer_TCCR1B=0x81;
  volatile short *Timer_TCNT1=0x84;
  volatile short *Timer_OCR1A=0x88;
  volatile char *Timer_TIMSK1=0x6F;
 
 *Timer_TCCR1A=0;
 *Timer_TCCR1B=0;
*Timer_TCNT1=0;      //counting start from 0

 *Timer_OCR1A=60000;    //compare match register
 *Timer_TCCR1B=0x0C;
 *Timer_TIMSK1=0x02;    //out compare register enabled pgno402
}
void init_port(){
  volatile char *portF_dir=(volatile char*)0x30;
  *portF_dir=0x01;
}
ISR(TIMER1_COMPA_vect){
  volatile char* portF_data=(volatile char*)0x31;
  *portF_data=0x01;
}
void loop() {
  // put your main code here, to run repeatedly:

}