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Original question:

TMS320F28335: GPIO internal pull up/pull down resistor values: Configure-able?

TMS320F28027: booting issue

krupa k
Prodigy 10 points

Part Number: TMS320F28027

can i remove the pull up resistor connected to GPIO 34 (boot pin). if i remove it will that still provide booting to the mcu? if yes, how?

  • 0
    TI__Mastermind 30185 points

    Hello Krupa,

    If you want to avoid using a pullup resistor, you do not need to remove it. You can simply use the GPIO Port B Pullup Disable register, (GPBPUD) to disable the pullup for GPIO34, you do not need to physically remove it.

    However, I do not know if this will affect booting the MCU as you're asking, so give me some time to look into this.

    Best regards,

    Omer Amir

  • 0
    TI__Guru* 95315 points

    It is not clear whether you are referring to removing the internal PU or an external PU and the reason for such removal. If it is the internal PU, then use the method suggested by Omer to disable it. If you are referring to an external PU, note that the internal PU is a weak PU and that is the reason it is complemented by an external PU. If you remove the external PU, the pin may not be reliably sensed high during boot (especially if the system is noisy).