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Pullups/Pulldowns on OMAP-L138/AM1808

Inderjit Bains
Expert 2745 points
Other Parts Discussed in Thread: OMAP-L138, AM1808

Stated in every Terminal Function table in the OMAP-L138/AM1808 datasheets:

IPD = Internal Pulldown resistor; IPU = Internal Pullup resistor; CP[n] = configurable pull-up/pull-down (where n is the pin group) using
the PUPDENA and PUPDSEL registers in the System Module. The pull-up and pull-down control of these pins is not active until the
device is out of reset. During reset, all of the pins associated with these registers are weakly pulled down. If the application requires a
pull-up, an external pull-up can be used.

 How soon after reset is de-asserted do the internal pullup/pulldown resistor become active?  Do the pins go back to being weakly pulled down during a Warm Reset?

  • 0
    TI__Guru 62975 points

    Inderjit,

    The pins go back to being weakly pulled down for both POR and Warm reset when reset is initiated by the physical RESET pin.  The Advanced Reset function in CCS does not cause the pins to be weakly pulled down.

    There is no spec on when the weak pull down is released, but it should be safe to assume that the pins are released from weak pull down before the reset sequence is completed (before RESETOUT is released).

    -Tommy