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SELM_1不加的话，用示波器看SMCLK的频率是1兆，但是加上SELM-1后，用示波器看SMCLK的频率是270khz。请问是什么原因啊？
您好，SELM选择的是MCLK的源，所以和您确认一下您观测的是哪个引脚？
我查看的是SMCLK的频率。但是很明显，其余都不改动，只是添加SELM_1后对SMCLK的频率有影响。
您参考一下我们的UCS例程：C:\ti\msp\MSP430Ware_3_80_14_01\examples\devices\MSP430F5xx_6xx\MSP430F55xx_Code_Examples\C
