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28377S的ePWM时钟频率问题



我在程序中进行了如下设置:

EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; 
EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;

ePWM1的时钟频率应该是相对于系统主频不分频的。但是测试后发现ePWM的时钟频率不是200MHz而是100MHz,请问这是为什么呢。