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Inputs are broadcast to all multiplexed functions

James Liebner
Prodigy 10 points
Part Number: TMS570LC4357

Figure 6-3 of the TMS570LC4357 Technical Reference Manual (SPNU563A) shows an example of how inputs on a terminal are broadcast to all connected multiplexed functions. Is it possible for the settings of some of those functions to affect the input signal as seen by other functions?

For example, terminal W10 is multiplexed to GIOB[3] and DCAN4RX. If the intended use of the terminal is as DCAN4RX, are there recommended settings for GIOB[3] regarding direction, pull up, etc?

  • 0
    TI__Guru**** 186256 points

    The W10 pin is connected as input to both the GIOB[3] and DCAN4RX. there is no input multiplexing on this pin. It is fine if GIOB[3] is not used. If you want to use GIOB[3] as input, you can select R4 pin to be used as GIOB[3] (input only). 

  • 0 in reply to QJ Wang
    Prodigy 10 points

    Hi, thanks for the response.

    I would like to use pin W10 as DCAN4RX, with GIOB[3] not used.

    By default if not otherwise configured, GIOB[3] in the GIO module will be an input with internal pull down enabled.

    Because W10 does not have internal multiplexing, would the default internal pull down from the GIO module effectively be an internal pull down on DCAN4RX as well?

  • 0 in reply to James Liebner
    TI__Guru**** 186256 points

    The internal pull up and down is very weak. The internal pull-down from GIO module doesn't affect CAN4's bus status. 

    As stated in the notes, it's better to configure the GIOB[3] as output pin.