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GPIO最高输出速度问题

Other Parts Discussed in Thread: MSP430F5438

我使用的是MSP430F5438,MCLK和SMCLK由外部晶振提供20M的时钟,我现在实测的GPIO翻转速率仅有3M多的速率,请问提高GPIO输出速率怎么做,能不能达到20M的输出呢?

谢谢!