数控分频器的功能就是当在输入端给定不同输入数据时，将对输入的时钟信号有不同的分频比，参考代码中的数控分频器是用可并行预置的加法计数器设计完成的，当加法计数器溢出时进行并行预置。-The function of NC divider is when in the input given different input data, the input clock signal has a different frequency ratio, reference code in the NC divider is parallel to finish the design of the addition counter preset, when the addition counter overflow of parallel presetting.