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请问CC2540里面的GPIO和peripheral的区别

我在设置寄存器的时候

P0SEL = 0;

为0的时候表示是GPIO,为1的时候表示是peripheral,但是具体这两者之间的区别我不是很懂,

请问在何种情况下设置为GPIO,何种情况是peripheral?

十分感谢

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