msp430f5328 进入LPM4.5后，整个板子功耗电流为0.9 ua，但该值不稳定，会逐渐增大至36.8ua，然后再从36.8ua 降低至0.9ua，
如此来回震荡，请问是什么原因？是某个GPIO 状态不稳，导致的震荡吗？
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