Counting is one of the simplest and basic operations. A counter is a logic circuit that implements this kind of operation. In a digital system, a counter mainly counts the number of pulses to achieve the functions of measurement, counting, and control. It also has a frequency division. Function, the counter is composed of a basic counting unit and some control gates. The counting unit is composed of a series of various triggers with the function of storing information. These triggers include RS triggers, T triggers, D triggers, and JK. Triggers, etc.
The most sequential logic circuit used in digital electronics. The counter can not only be used to count clock pulses, but also can be used for frequency division, timing, generating beat pulses and pulse sequences, and performing digital operations. However, the calculation result cannot be displayed. Generally, it can only be displayed through an external LCD or LED screen.
Counters are used in industry with the following features: 1. 6-digit LED digital display; 2. There are two count inputs: A and B; 3. The counting frequency can reach 20KHz; 4, also has an LED warning light indication; 5, at the same time support RS485, RS232 serial interface, the output, power, communication with each other using optical isolation without interference.
The counter application includes records of call, text message, data and other categories, and supports users to choose the clearing date and add reminder values according to categories. For example, the user can choose any day of the month, or the first and last day as a record cycle Clear day, and add reminder nodes for call duration, number of SMS messages, and data traffic.
The counter is widely used, not only for counting, but also for frequency division, timing, and the formation of various detection circuits and control circuits.
For the convenience of use, some monolithic integrated counters also have functions such as asynchronous zero setting, preset number, hold, and the corresponding control end.