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在System Control and Interrupts Reference Guide中描述GPIO：GPIOINENCLK设置是否使能GPIO的输入时钟，关于GPIO的输入时钟有点晕，GPIO需要时钟做什么？
GPIO也需要和时钟同步。比如说，有些GPIO可以使用滤波的功能，需要同步时钟，等。
