westfw:
--Every 100 ms or so, wake up (via a Timer2 interrupt)
Were you planning on attaching an external crystal to timer2? If not, you are going to need to use one of the power-saving modes that leaves the crystal oscillator running, and these are not subject to the 65ms oscillator startup time.
westfw, yes, I was planning on connecting a 32 Khz crystal. Would that preclude the startup time? If so, I'm a little unclear on why the 65ms startup time would only apply in case of the main oscillator.