wow that's great Bruce, thanks a lot
you got farther along than i did, but this was pretty much what i was thinking about
doing

i think i will go to a 0.1mf cap for about 3 seconds

question
do you see a way to distinguish this ULPWU interrupt from some other pin that may have caused wake up from SLEEP ?
i don't

also
in your example code PROBE is for your scope and not directly related to the ULPWU pin, when you
TOGGLE PROBE
your comment says 'clear mismatch register'
does this mean that writing to any pin will clear the mismatch ?
i thought there was a mismatch bit for each pin ?