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外部晶振做时钟 经过倍频后精度不变还是怎加了 ？ 10M 晶振 20ppm 倍频到60M 精度 是20ppm 还是 120ppm？
首先说明一下，芯片手册中没有基于晶振精度对应的时钟频率精度的说明。其次，根据倍频分频的算法，系统频率跟晶振频率是成常规系数关系的，也就是正比例增减，所以我觉得最后的系统时钟精度会是120ppm
