With synchronous counters, all the data bits change synchronously with the application of a clock signal. A counter can be constructed to operate as a synchronous circuit or as an asynchronous circuit. Counters that operate in both the UP and DOWN modes, are called bidirectional counters.Ĭounters are sequential logic devices that are activated or triggered by an external timing pulse or clock signal. Likewise, counters which decrease their sequence of numbers or states when activated by a clock input are said to operate in a “count-down” mode. Counters which advance their sequence of numbers or states when activated by a clock input are said to operate in a “count-up” mode. The job of a counter is to count by advancing the contents of the counter by one count with each clock pulse.
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