High frequency counter

Suppose that Enable is high, the counter counts up every clock cycle, and the frequency of the PWM output is the clock frequency divided by 2 count bits.

假设高信号使能，计数器每个时钟周期进行计数，PWM输出的频率为时钟频率的2次幂分频。

Owing to the limited frequency of the internal high-speed counter of PLC, the peripheral unit of PLC is used for PLC-based frequency measurement of hydraulic turbine governors.

基于可编程序控制器（PLC）的水轮机调速器，受PLC内部高速计数器最高计数频率的限制，频率测量大多通过PLC外部单元来实现。

The disadvantage of high precision frequency accuracy measurement method available is that an expensive high-resolution time interval counter is needed.

常用高精度校频算法的不足在于需要昂贵的高分辨时间间隔计数器。