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// Arduino timer CTC interrupt example - interrupt evry 1/100s
#include <avr/io.h>
#include <avr/interrupt.h>
 
#define LEDPIN 13
 
void setup()
{
    pinMode(LEDPIN, OUTPUT);
 
    // inicializacija Timer1
    cli();          // disable all interrupts
    TCCR1A = 0;     // TCCR1A register on 0
    TCCR1B = 0;     // TCCR1B on 0
 
    // set compare match register to desired timer count
    OCR1A = 624;
    // turn on CTC mode
    TCCR1B |= (1 << WGM12);
    // prescaler  - 1:256
    TCCR1B |= (1 << CS12);
    // enable timer compare interrupt
    TIMSK1 |= (1 << OCIE1A);
    // enable all interrupts
    sei();
}
 
void loop()
{
    // do some stuff while my LED keeps blinking
}
 
ISR(TIMER1_COMPA_vect)
{
    digitalWrite(LEDPIN, !digitalRead(LEDPIN));   //Flashing LED and frequency control
}