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DS90UB927和DS90UB928的IO口透传PWM信号

目前我们在项目中通过DS90UB927和DS90UB928的IO口透传PWM信号的时候遇到一点问题,在927侧输入的PWM波形的和在928侧输出的PWM波形不一样,

   有两个问题需要咨询一下你们:

        1.927和928的IO口可不可以透传PWM信号?

        2.如果可以,则可以透传的PWM信号的最高频率是多少?以及占空比

可能是哪儿出了问题,导致上述现象?