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Microcontroller reset condition

Discussion in 'Electronic Basics' started by Dummy, May 18, 2004.

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  1. Dummy

    Dummy Guest

    RESET pin is active low.
    During powering up, the RESET pin is being pulled high.
    I encounter a situation where under certain condition, microcontroller
    resets without any glitches observed at RESET pin which is still HIGH
    at 3.3V. The sytem resets itself, and I assume that's because of
    microcontroller resets.
    So I was wondering whether RESET pin needs to be driven low before
    resetting? Any other forms of reset that doesn't need a low on RESET
  2. Paul Burke

    Paul Burke Guest

    What uC ? Power glitches? Someone else mentioned watchdog. Does this uC
    have illegal opcode trap? Have you forgotten to enclose the program in a
    while(forever) loop? Is your test gear fast enough to see all relevant
    glitches? Is it really a reset, or is it just vectoring to the restart
    routine via say an uninitialised interrupt vector?

    Paul Burke
  3. maxfoo

    maxfoo Guest

    Just solder a 1K resistor in series from reset pin to Vcc and be done with it.

    Remove "HeadFromButt", before replying by email.
  4. maxfoo

    maxfoo Guest

  5. most likely the watchdog timer. disable it in the configuration settings.
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