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MSPM0C1104: RST issue

Li Bo
Prodigy 20 points
Part Number: MSPM0C1104


Tool/software:

Hi, 

we found MCU RST couldn't work, below is testing:

step1. TI-RST-new1.png: when power up, RST always Low and after 500ms, pull it to High.

     but, found MCU not work.

step2.  TI-RST-new2.png: after step1, pull RST to Low 100us, then pull Up. found MCU begain to work.

step3. TI-RST-new3.png: when power up, RST always Low and after 500ms, pull it to High, delay 100ms, pull it Low for 180us,

           then pull it High. but, still found MCU not work.

below is RST Low about 180us

step4: ater step3, repeat step2, MCU could work.

Best regards,

Bob

  • +1
    TI__Mastermind 40040 points

    Hi 

    Sorry for the late reply, when I did the test today I don't fond this issue. Here is what I did from myside

    Using two LP-MSPM0C1104 one is to control the RST pin pull up delay time the other is just toggle GPIO.

    Hardware connection: Controller side board using PA2 to control target side NRST pin and using PA26 to detect 3.3v from target side. So need to connect PA2(Controller) to NRST(target), PA26(controller) to 3.3v(target) and shared the GND.

    Software:

    Controller side code:

    LP_MSPM0C1104_NRST_TEST.zip

    Target test side code:

    gpio_toggle_output_LP_MSPM0C1104_nortos_ticlang.zip

    First make the controller side be powered and running the code, then power on the target side board, capture the signal of NRST pin, target 3.3v and target GPIO pin as below

    As you can see it is working normally. 

    You can try to use same set up with mine  to see if you also can get the issue above.

    By the way, dose the issue happen every time or just some time?

    Could you upload a picture of the device top screen and let know if the device you test is our production device or early samples.

  • 0 in reply to Gary Gao
    Prodigy 20 points

    thank you, we find the reason.

    when power up, MCU receive a interrupt signal and ISR API has some error, it make MCU hung up.

    after fixed it, it work ok.

    thank you.