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MSP432P401R SPI CLOCK

我想要將SPI的速率更改為8M,但系統本身的速率應該要高於SPI速率對嗎?

我用的範例是http://dev.ti.com/tirex/explore/node?node=ABEAZlDMprmacNpMLdmkWw__z-lQYNj__LATEST&search=MSP432P401R

根據我的推測,要更改速率應該是圖片中的兩行程式碼,我研究了 userguide,但我還是不懂我該如何更改SPI CLOCK和系統的主時鐘,我的SPI速率要8M,而主時鐘應該要改成比SPI時鐘更快一些。