TCNT1 = 0; TCCR1A = 0; TCCR1B = (1 << WGM12) | (1 << CS10); // CTC, fclk/1 OCR1A = TIMER_1MS_TICKS; TIMSK = (1 << OCIE1A); __enable_interrupt();....#pragma vector=TIMER1_COMPA_vect__interrupt void irqTimer1Handler(void){/// ops }