> Perhaps I could use a pre-built RTC? I vaguely remember seeing
> some reference timed alarms in their datasheets... Have the RTC
> turn the PIC on every week or something

As long-term accuracy isn't an issue for you, you might want to
consider the DS1284 / DS1286. Has its own internal 10-year
battery and settable alarm. Sounds ideal

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2678



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