5.2.8. Frequency division

Among the important applications of the flip-flop is the frequency divider. Namely, if we connect the inverted output of D flip-flop to the input and bring the clock, the clock of the halved frequency will appear on the positive output, which is shown on the left part of the following figure. It is no surprise that this circuit is called divide-by-2 counter, because frequency division will help us create counters which are extremely important digital circuits. If we want to continue to divide the frequency, we should connect the inverted output of the first flip-flop with the clock of the next flip-flop, which is shown on the right side of the figure.

Figure 5‑16 D flip-flop frequency division
(Source: referenced)

Let us create an experiment.

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References:

https://www.electronics-tutorials.ws/counter/count_1.html