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28377的sdfm模块的时钟输入问题

ti工程师:

28377的sdfm模块的输入有时钟信号和数字流信号,ti的开发套件上采用的时钟信号是PWM波来作为sdfm模块和外部调制模块的时钟输入,28377的datasheet上面也说可以采用pwm模块来产生时钟信号作为sdfm模块的时钟输入。我的问题是sdfm模块的时钟输入只能采用pwm模块吗?如果是为什么只能采用pwm作为始终输入呢?期待你们的回答,谢谢!