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

Part Number: MSP430F67471A


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? 



  • Hi Uchida!

    From the datasheet you can see that the COM functionality overrules all the other settings for the pin since they are don't care:

    So the COM functionality is controlled by the LCD module settings. From the user's guide you get the following:

    This text says, that the multiplexing mode sets the required pins to COM functionality and the multiplexing mode is configured here:

    As a result, when using 4-mux mode or higher, pin 41 is set to COM3, regardless of any settings of P1SEL, DIR or whatever.


  • Hi Dennis,

    I understand.
    Thank you for your reply.



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