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当不使用外部晶振。只使用内部REFO作为系统时钟源 , ACLK=32.768K, SMCLK=1M。UART在哪种休眠状态下能自动被唤醒? LPM0还是LPM2, 希望LPM3模式下接收到UART数据也能自动唤醒。