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AM6442: unused pins in sysconfig

Kanae
Mastermind 9945 points
Part Number: AM6442
Other Parts Discussed in Thread: SYSCONFIG

Hi Support Team,

How should unused pins be configured in sysconfig?
For example, if GPIO1_19 is not used, should it be unchecked?


Or should it be checked and configured to enable No PULL and kept OPEN in hardware?

Best Regards,
Kanae

  • 0
    TI__Mastermind 37678 points

    Hello Kanae,

    Thanks for reaching out to Texas Instruments E2E support forum.

    Can you please tell us why are you configuring the GPIO1_19 pin when it is not used by the application?

    If you are not using a specific GPIO pin in application, there is no need to configure it.

    Regards,

    Tushar

  • 0 in reply to Tushar Thakur
    Mastermind 9945 points

    Hi Tushar,

    Thank you for your reply.

    Just an example for GPIO1_9, but I was concerned that if the internal PULL is not enabled,
    the internal PULL will be disabled after the reset is released.

    Is it correct in my understanding that such concern is unnecessary and does not need to be set in sysconfig?

    Best Regards,
    Kanae

  • +1 in reply to Kanae
    TI__Mastermind 37678 points

    Hello Kanae,

    Thanks for your response.

    Kanae said:
    Just an example for GPIO1_9, but I was concerned that if the internal PULL is not enabled,
    the internal PULL will be disabled after the reset is released.

    I have checked the above details in the datasheet and found that GPIO1_19 can support for both Pull Up and Pull Down states. The GPIO pin once configured(either PU or PD) in application after initialization will hold the configured value. So when the reset happens the Pin mux settings for specific ball number will go to its default state/pin until configured in the application and hold the previous state for PU/PD settings configured. 

    Please refer below screenshot.

    Please refer to device specific datasheet for more details.

    Hope the above information helps.

    Regards,

    Tushar