>>Done. There are eight button cells, about 3mm tall and 9.5 in
>>    
>>
>
>Way to go. Here are some tips from Microchip. The nW parts
>are what you really want to be using for longest battery life (I've
>tested the 12F675 at 7nA SLEEP current)
>
>================================
>
>http://www.microchip.com/stellent/stellent/idcplg?IdcService=SS_GET_PAGE&nod
>eId=1484
>
>Q. How can I make my PIC16/17 run as low power as possible?
>
>A. Section Tips Posted: 10/25/1997 10:35:49 AM Discussion:
>
>1. Run the clock as slow as you can.
>
>2. Disable the watchdog timer
>
>3. Put the part to sleep whenever possible.
>
>4. Use MCLR to wake part from sleep instead of the WDT if possible.
>
>5. Do not let any inputs float.
>
>6. Do not drive any unnecessary loads. Minimize capacitive or inductive
>loads on switching I/O pins, or resistive loads on other driven pins. If
>a pin is not to be used you can leave it disconnected and drive it low
>or high, or put a pull up or down resistor on it as an input.
>
>7. Turn off all timers when not in use. For instance, TMR0 can be
>incremented from the instruction clock or an external pin. When not in
>use, assign it to the pin (if it is toggling at a lower rate than the
>instruction clock). Do not use prescalers when unnecessary. In other
>words, minimize the amount of logic changing states.
>
>8. Turn off any other peripherals when not in use
>
Exactly. Now the fun begins!  :-)

BTW, I didn't realize the 12F675 was a nW device... and how did you 
manage to *measure* 7 nA?
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist