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原先使用475MHZ的片子，接24MHZ晶振能刚好倍频到456MHZ。现在改用375MHZ的片子，我计算了下，如果还是用24MHZ的晶振没法倍频到375MHZ。
请问我应该选用多少MHZ的晶振才能刚好倍频到375MHZ呢？
