该模块为分频器，将1KHZ的时钟频率分频成每分钟一次的时钟频率 事实上，该源码可以实现任意整数的分频，主要让N的值设置好相应的数字-The module for the divider, the clock frequency 1KHz frequency per minute into the first clock frequency In fact, the source can be any integer frequenc