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TMS570LC4357: Is it possible to use Pin J2 and R3 simultaneously as GIOB[6] ?

Max Wittekind
Expert 1875 points
Part Number: TMS570LC4357


Hello Hercules Support-Team,

We are using the Pin J2 as nERROR, but we want to prevent the nERROR signal on J2 to go LOW on tests that trigger an ESM Error. So for the duration of the test we want to configure J2 as GIOB[6], which is already configured for Pin R3. During the test the state of R3 can be High. So we plan to configure GIOB[6] to be in state HIGH and then switch to J2 so that J2 and R3 output HIGH.

(Q1) Is it possible to configure GIOB[6] to be used simultaneously on PIN R3 and J2?

Thank you and best regards,
Max

  • 0
    TI__Guru**** 198766 points

    Hello Max,

    Yes, both J2 and R3 can be configured as the output of GIOB[6] at the same time. If GIOB[6] is configured as input, only one of J2 or R3 can be used.

  • 0 in reply to QJ Wang
    Expert 1875 points

    Hello QJ,

    Thank you for the quick answer. I have one follow up question.

    (Q2) What happens when R3 ist GIOB[6] Input and then J2 is switched to GIOB[6] also?

    Thank you and best regards,
    Max

  • 0 in reply to Max Wittekind
    TI__Guru**** 198766 points

    Hello Max,

    The PINMMR87[8] and PINMMR[9] are used to select which pin is used as input to GIOB[6]. 

    If PINMMR87[8] is set and PINMMR87[9] is cleared, the terminal J2 is selected. If PINMMR87[8] is cleared and PINMMR87[9] is set, the terminal R3 is selected. 

    If both PINMMR87[8] and PINMMR87[9] are set or cleared, the Default Function (J2) will be selected as GIOB[6] input.