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系统时钟是25MHZ，要给PWM时钟分频，应该怎么去分配，两者的关系优势什么?
你看看这是官网的程序，先设置系统主时钟，然后配置PWM的时钟
PWM的操作，请参考：
C:\ti\TivaWare_C_Series-2.1.0.12573\examples\peripherals\pwm
这里库函数有详细的配置。
