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Reset pin of microcontroller!!

Discussion in 'Microcontrollers, Programming and IoT' started by coolbro, Oct 22, 2012.

  1. coolbro

    coolbro

    9
    0
    Oct 18, 2012
    What happen if I dont connect reset pin of microcontroller. Will my microcontroller work properly?
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Depends... On some chips if left floating (unconnected) you can get periodic random resets, full out repeated non-stop resetting, or it might work fine... On some chips you can disable it with a fuse when you flash the firmware and use it as a regular I/O pin, on others you can't...
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    9,364
    1,901
    Nov 17, 2011
    Just don't do it. Tie the reset pin to a defined level using a pull-up or pull-down resistor.

    Beware of disabling the reset pin by programming a fuse or similar. Some chips can no longer be programmed with low voltages (or in system) if the reset pin is disabled.

    When in doubt, consult the manual of the µC in question.
     
  4. Zork

    Zork

    11
    0
    Oct 26, 2012
    Hi coolbro, unfortunately not all microcontrollers have a pull-up (or down) reset to drive a stable level to this pin when floating, you have to look on the datasheet of the device, but it isn't a good idea if the ic doesn't have an internal circuit to monitor the voltage on the power supply (brown-out detector).
     
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