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在PLL Configration里Frequency始终为0，且不可修改，请问个大神，这是bug还是我哪儿操作不对，附图如下：
并且配置完PLL后，系统自动会将CPU clock frequency改为0！！！
这算答案吗？？？？
应该是需要在代码里进行PLL的配置。
