它们是模拟计数器，经编程后可以计算脉冲。
它采用二进制计数器以把被乘数由并行形式转换成脉冲序列形式。
It USES binary counters for the conversion of the multiplicand from parallel to pulse-train form.
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 .
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