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MSP430F4152基础时钟



#define SCFQ_2M (0x3F)    

单片机外接时钟32.768KHZ,时钟初始化SCFQ_2M;///* fMCLK=64*fACLK * /,用是示波器查看输出主时钟频率2Mhz,但是会有0.5mhz左右的波动,这正常吗?可以通过什么语句设置使它更稳定些