Hi, Lawrence

> Now, I would think that a brownout reset would take care of any power
supply
> dips, and I have brownout reset enabled in this chip.  Any reboot that is
> not a clean Power-on-reset will trigger a watchdog timeout and also shut
off
> the power.  Is there something I don't understand about brownout reset, or
> is there some level of Power Supply voltage that might be below spec for
the
> PIC, but not hit the brownout voltage?

    If your supply line inverts polarity on power up or any of your pins see
negative voltages very weird things can happen. This might happen if you
power on cycle is so bad as you describe. One option to test if this is the
case is to make a hardware power up delay of the pic's supply. Easily done
with 1 or 2 small transistors and passives.

    ALWAYS set your unused pins to outputs or tie them to VCC or Ground with
a resistor.

Best regards,
Alexandre Guimaraes

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