In a message dated 97-03-24 19:30:06 EST, you write:

<<
 I made the move from running my project with the emulator to running with
 the actual part today. Seems to work fine at 5V but when I switch from power
 supply (5V) to battery (3.6V) the PIC doesn't seem to run.

 I programmed the PIC with my Picstart Plus. I ordered a Promate two weeks
 ago but due to the efficient purchasing group they haven't placed the order
 yet. I seem to recall something about needing a special programmer for other
 than 5V supply operation. Can someone please enlighten me. The data book
 didn't seem to.

 Thanks,

 - -Mark
  >>
Mark,
What kind of battery are you using?  Size, MAH rating?  I recently finished a
project using the 68HC916.  I had a rough time with the power consumption.
 If you are using lithium cells, the voltage accross the cell will change
with current output.  You may be dipping below the minimum voltage the Pic
will run at.  What is your current consumption at 5 volts?  We had to use a
MAX878 micro power switcher.  I can get a good 3.3 volts out even if the
input battery voltage drops down to .8 volts.  The switcher will put out
100ma max.
Hope this helps
Dave Duley
V.P. DreiTek Inc.