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MSP430F5438 LPM4 为何SMCLK还有时钟输出?

Other Parts Discussed in Thread: MSP430F5438

各位大侠,MSP430F5438 ,进入LPM4,3.15V,功耗还有0.5mA左右,且SMCLK还有时钟输出。问题可能出在哪里?