每当计数器被时钟脉冲触发一次时，计数器输出的二进制数便累减1。
The counter output, which represents a binary number, decreases by 1 any time the counter is triggered by a pulse .
数据选择器则将两个计数器中处于保持状态的奇偶数据交替输出，实现双边沿触发加法计数器的功能。
Data selector alternately to realize the functions of double edge trigger addition counter output the odd and even data in two counters.
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