预分频值（prescaler）和时钟分频因子（ClockDivision）有什么区别？

1、prescaler 是用来分频来自APBx的时钟频率，然后提供给定时器，作为定时器的心跳。
2、ClockDivision是对于输入的分频，在输入捕获的时候要用到，相当于滤波。

关于定时器时钟分频因子(ClockDivision)和预分频系数(Prescaler)

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