Counter (digital)

Common card · No. 466450

In digital electronics, a counter is a sequential logic circuit that counts and stores the number of positive or negative transitions of a clock signal. A counter typically consists of flip-flops, which store a value representing the current count, and in many cases, additional logic to effect particular counting sequences, qualify clocks and perform other functions. Each relevant clock transition causes the current count to increment or decrement (increase or decrease by one). A digital counter is a finite-state machine, with a clock input signal and multiple output signals that collectively represent the state. The state indicates the current count, encoded directly as a binary or binary-coded decimal (BCD) number or using encodings such as one-hot or Gray code. Most counters have a reset input which is used to initialize the count. Depending on the design, a counter may have additional inputs to control functions such as count enabling and parallel data loading. Digital counters are...

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