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当使用24M时钟作为 SMCLK和MCLK时，MSP430F5438A SPI 的最高速度是多少？
SPI速度的瓶颈是IO口状态转换的时间。对MSP430F5438A来讲
fuclk(max) = 1/tsu + thd + tvalid
参考F5438A数据手册可以得到(3.0V)
fuclk(max)=1(50nS+0nS+20nS) = ~14Mhz
在2.2V下，fuclk更低一些。
