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MSP430与CC2530串口UART通信问题

Other Parts Discussed in Thread: MSP430F149, CC2530

应用MSP430F149与CC2530应用UART通信(MSP430F149和CC2530的电源VCC分别有按键开关控制),发现以下问题:

Q1:MSP430F149的开关关闭,CC2530的开关打开,MSP430F149仍然能够正常运行,并且UART通信正常且稳定,请问为什么?

Q2:MSP430F149的开关打开,CC2530的开关打开,MSP430F149仍然能够正常运行,此时UART通信不稳定(有少发字节现象),请问为什么?