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MSPM0L1306-Q1: MSPM0L1306请问怎么设置单片机的运行频率

Part Number: MSPM0L1306-Q1
Other Parts Discussed in Thread: MSPM0L1306, SYSCONFIG

MSPM0L1306在低温-40度不能启动,,担心可能是单片机运行频率的问题,用的是单片机的内部晶振,ROSC接了一个100K,25PPM的电阻,请问怎么设置单片机的运行频率?就是上电设置单片机运行频率的代码,想让单片机在低频率下运行看看,比如是设置为4MHZ的运行频率,急,谢谢了!