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关于TM4C123GH6PM芯片工作频率设置问题

Other Parts Discussed in Thread: TM4C123GH6PM

您好,我想问一下,TM4C123GH6PM芯片datasheet上写的是工作频率为80MHz。

其芯片内部有一个400MHz的锁相环,通过软件,将芯片的系统频率设置为200MHz,其内部运行时真的是200MHz吗?我试了一下,结果没变快,反而变慢了,这是为什么?