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关于MSP430断电后从串口窃电的问题

Other Parts Discussed in Thread: MSP430FR6972, MSP430FR2311

现有msp430fr6972和stm32两套系统,两套系统分别采用两块电池单独供电,中间仅采用三串口线(3.3v) TXD、RXD、GND连接。现在发现,msp430完全放电后后连接到stm32系统,只要stm32 TXD线空闲时为高电平,msp430就可以仅靠stm32串口供电继续工作,现在的解决方法在stm32空闲时将串口转换成普通IO后变为低电平。经过测试,msp430fr2311与电脑usb转串口仅三线连接时也会出现该问题,TI针对此问题在不使用光耦时有什么好的解决方法吗?