setup_timer1.ino

void setup_timer1(void)
{
    // Timer/Counter 1 initialization
    // Clock source: System Clock
    // Clock value: 62.500 kHz
    // Mode: CTC top=OCR1A
    // OC1A output: Disconnected
    // OC1B output: Disconnected
    // Noise Canceler: Off
    // Input Capture on Falling Edge
    // Timer Period: 1 s
    // Timer1 Overflow Interrupt: Off
    // Input Capture Interrupt: Off
    // Compare A Match Interrupt: On
    // Compare B Match Interrupt: Off
    TCCR1A = (0 << COM1A1) | (0 << COM1A0) | (0 << COM1B1) | (0 << COM1B0) | (0 << WGM11) | (0 << WGM10);
    TCCR1B = (0 << ICNC1) | (0 << ICES1) | (0 << WGM13) | (1 << WGM12) | (1 << CS12) | (0 << CS11) | (0 << CS10);
    TCNT1H = 0x00;
    TCNT1L = 0x00;
    ICR1H = 0x00;
    ICR1L = 0x00;
    OCR1AH = 0xF4;
    OCR1AL = 0x23;
    OCR1BH = 0x00;
    OCR1BL = 0x00;

    // Timer/Counter 1 Interrupt(s) initialization
    TIMSK1 = (0 << ICIE1) | (0 << OCIE1B) | (1 << OCIE1A) | (0 << TOIE1);

    // Global enable interrupts
    sei();
}