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MSPM0G3507: 串口时钟源为ULPCLK,为何MCU唤醒态和休眠态都可以支持串口通信

Part Number: MSPM0G3507

STANDBY0模式,串口0和串口1时钟源都采用的ULPCLK,为何能正常唤醒MCU呢?按理说低功耗模式下,高速时钟都停止了,串口应该收不到任何数据的。这怎么解释呢