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> The PCF8593 appears to run on only 1uA; is it possible to
> run a pic as an RTC at similar current levels?

Not as far as I'm aware. However, if you're going to use an
external device, and I hesitate to mention this again as I've
done so fairly frequently, you can make your own very very
low Iq calendar IC from a standard kitchen clock IC and a
12F. Combined Iq for most of 2 seconds is around 60nA.
Accuracy can be less than 1 minute per year, and I've found
the cost of the original clock makes no difference. It can be
an awful-looking $1 plastic thing or a $50 up-market job.
Obviously you know which one to trash ;-)

I've also tried this with an old digital watch, by taking the
colon drive line for the LCD. OK for a one-off but otherwise
fiddly

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