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计数器是最常用的时序电路之一，他们不只可以用来指望脉冲，还可以分频，定时，发生跳动的脉搏和其他的时钟信号等。
The counter is the most commonly used one of the sequential circuits, they not only can be used to count on pulse, still can separate frequency, timing, produce beats pulse and other clock signal etc.
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