brief introduction： Counting is one of the most simple and basic operation, the counter is for the operation of logic circuit, a counter in a digital system is mainly to count of the number of pulses, so as to realize the function, measuring, counting and control of frequency division function concurrently at the same time, the counter is controlled by basic counting unit and some of the door, the counting unit consists of a series which has the function of storing information of various kinds of trigger, the trigg

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