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28377D的ADC采样问题

请教下,28377D中用到两组PWM,分别对应两组ADC,如果两组PWM同步同频,那么或可以放到一个CPU里运行ADC采样并PWM计算控制,现在的情况是,PWM输出的频率不同,也就是两组PWM对应AD采样的频率不同,那么这样的情况怎么实现ADC采样以满足两组PWM控制.