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F28335能否通过20M外部晶振PLL倍频内部系统时钟到140M，RT。另外，一般C2000系列外部晶振频率选择范围大概是多少？谢谢
Mecca,
首先好奇你为什么选择140M的主频。
其次是根据下图，20M的主频没法倍频到140M。
一般晶振选择 10M， 20M ，30M。
