MSP430F67471A: When Is a GPIO pin multiplexed LCD COM port switched from GPIO to COM function?

Part Number:MSP430F67471A

Hello.

I have a question.

When I use 41pin in MSP430F67471AIPZ as LCD COM Port, what kind of register bit  switch from GPIO to LCD COM function ?

I understand 41pin works as LCD COM Port when I use LCD with the mode using the COM3.

But I don't know what register bit switch to it.

Is it settings LCDON bit to 1?  or, LCDMx bit to not 0? 

Regards,

uchida-k