brief introduction： Counter logic circuit for the achievement of this operation, mainly in digital system 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 trigger with RS flip-flop, T flip-flop, D flip-flop and JK flip-fl

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