There is a design for self switched PIC here:
http://www.romanblack.com/self_swi.htm

uses one cheap tiny (TO-92) SCR, and 2 resistors,
will work with a 7805 reg or just with the battery
and the PIC. :o)
-Roman




A.J. Tufgar wrote:
>
> Edson,
>       Have the second pole of all your buttons goto an 2 input or gate.
> and the output of the or goto the pic power pin (you'll have to make
> sure it handle you pic's current load or you'll have to put some sort
> of driver behind it).  The other input goes to a pic i/o pin.
>
> When a button is pressed it will turn your pic on via the or gate.
>  Your pic then changes the line going to the or gate high, so if the
> user releases the button before your pic is done it keeps power to
> itself.  When it's done set the line low and it will lose power.

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