John, We do not recommend supplying voltage to a particular pin when the MSP430 is not powered via DVCC. GPIO when the device is not properly powered are in a high impedance state. This means you can run into situations where the MSP430 can be back powered, or at least partially powered by GPIO when DVCC is 0V. It is possible in this situation the MCU will be in an unknown state or draw excessive current.
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