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怎么样才能让采样周期取PWM周期的十分之一，触发源怎么选择？
请问用的是哪颗芯片？
以下是以F280049为例的相关配置，具体信息可以下载技术手册http://www.ti.com/lit/ug/sprui33b/sprui33b.pdf
请参考下图中标红的寄存器配置内容。
请查看F28335 EPWM 文档 http://www.ti.com/lit/ug/sprug04a/sprug04a.pdf
其中分频寄存器只支持1，2，3次分频。
