Now that I see there's the PIC18Cxxx devices, which solves my RAM
problems, I wonder about battery backing the RAM.  I'm thinking MAYBE I
can just drive the PIC off my +5V through a diode with a super-cap after
the diode.  I'm HOPING that when the power goes out, as the super-cap
discharges, the brown out detect in the PIC would shut everything down
(ideally shutting down the oscillator, WDT, and putting the I/O pins in
input mode so they don't try to drive anything).  I can't seem to find
this sort of detail in the datasheets or application notes.
        Any ideas?  What WOULD be a good way to make the RAM in the PIC
nonvolatile?

Harold



Harold Hallikainen
harold@hallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

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