old_timerold_timer 71.9k99 gold badges9999 silver badges177177 bronze badges 1 from your title question. The frequency is ideally how fast the "clock" is, 16Mhz means every 62.5 nano seconds the logic is re-evaluated and changes state. If you are playing the piano and you dirilik change the notes once a second then you are at one hz, the prior note