• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 78 subscribers
  • Views 286 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F6779: P 1.1 (P1IN) register not detected I/O pin after reset first time

TinK
Intellectual 675 points
Part Number: MSP430F6779

Hi,

I have problem about P 1.1 (P1IN) register not detected I/O pin after reset first time.

Situation is following.

Step1: Power ON.

Step2: I/O pin P 1.1 Supply as high logic

Step3: Setting P 1.1 as input direction.

Step4: Reading the P1IN register but the value of P1IN not set as the I/O pin P 1.1 (it still 0).

Step5: I/O pin P 1.1 Supply as low logic

Step6: Reading the P1IN register, the value of P1IN is update correctly (P1IN update following the pin 1.1)

Why P 1.1 (P1IN) register not detected I/O pin after reset first time?

  • 0
    TI__Guru 60231 points

    Hi Tink,

    Interesting.  Let me dig into this and I respond with an answer.

  • 0 in reply to Dennis Lehman
    Intellectual 675 points

    Hi .

    I found this is errata  SLAZ350AD

    PORT26 PORT Module
    Category Functional
    Function Incorrect values for P1.1 / P1.2 input pins during power-up
    Description If P1.1/P1.2 is pulled up externally to DVCC during power-up the logical HIGH value might
    not be read correct by the device (ZERO is read instead of ONE).

  • +1 in reply to TinK
    TI__Guru 60231 points

    Hi Tink,

    Sorry for getting back to you so late.  Ok, so it sounds like you got it figured out.

    I'll change the status of this posting to RESOLVED, but if this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information.
    If this thread locks, please click the "Ask a related question" button and in the new thread describe the current status of your issue and any additional details you may have to assist us in helping to solve your issues.

**Attention** This is a public forum