MSP430: BSL mode - UART transmit pin

Hello:

In several MCUs of the MSP430 family, during the bootstrap loader mode,
the normal UART Tx/Rx transmit/pins aren't used. Instead, other pins are alloted for BSL transmit and receive.

Would you know if the normal Tx transmit output pin goes in high-impedance mode during the BSL mode?

Also, is there any register bit or pin offering information on
"normal" vs "BSL" status?

Thanks.

Jerry
.

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