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MSP430F5529: SPI时钟(CLK)不稳定,设定的时钟周期会在一个字节中发生变化

Part Number: MSP430F5529

TI官网提供的关于SPI主机部分的例程,经过简单修改(仅仅修改了对应的复用端口,SIMO: P3.3, SOMI: P3.4, CLK: P2.7),在逻辑分析仪中进行测试时发现周期并不稳定,请问这是硬件自己的原因导致的吗?还是有其它方法可以进行优化改进。