The main circuit that constitutes the counter is

The basic circuit of an electronic counter is a flip-flop.

The basic circuit of an electronic counter is mainly composed of an input circuit, a comparison circuit, a time reference circuit, a control circuit and a counting display circuit.

The working principle of the counter: We take the digital clock minute and second counter as an example to introduce its principle. It is mainly composed of a quartz crystal oscillator, frequency divider, counter, decoder display and time correction circuit. The oscillator generates a stable high-frequency pulse signal, which is used as the time base of the digital clock, and then outputs a standard second pulse through the frequency divider.

A counter is a device that can record the number of pulses and is the most commonly used logic component in digital circuits. In digital systems, counters mainly count the number of pulses to achieve the functions of measurement, counting and control, and also have frequency division functions.

The counter is composed of a basic counting unit and some control gates. The counting unit is composed of a series of various types of flip-flops with the function of storing information. These flip-flops include RS flip-flops, T flip-flops, and D flip-flops. Triggers etc.

The counter application includes records of calls, text messages, data and other categories, and supports users to choose the clearing date and add reminder values ??according to categories. For example, users can choose any day of the month, or the first day and the last day as the record cycle clearing day, and reminder nodes for call duration, number of text messages, and data traffic amount are added at the same time. Counters are widely used. They can not only be used for counting, but also for frequency division, timing, and to form various detection circuits and control circuits.