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C6657的upp时钟问题?



最近在做6657的upp部分,看datasheet时,有个疑惑,望各位能解答:

文档中有提到:upp的时钟最高可达75MHZ,可是又有提到upp的时钟最高可以为CPU频率的二分之一,假如CPU频率为1G,则UPP时钟速率为500MHZ,

这前后是不是有矛盾啊?

坐等解答!!!谢谢