> I'm wondering why are you using an external 4Mhz crystal instead of
> 16LF628's internal oscillator?

Mostly because it was Friday afternoon and I knew the calibration value had
long since been lost (or does 16F628 even have a calibration value like
12C508?), so I went with something I'd done many times before and didn't
require any looking up in the manual.  You are right, the internal RC
oscillator would probably be the right answer, after checking a few things
in the manual.

> Or the LF version doesn't have one?

It does.  F and LF parts are the same silicon.  The LF parts are the ones
found to work at lower voltages.  Sometimes regular F parts could have been
labeled as LF but weren't because of stocking and demand issues.

> That could save some power and reduce circuit complexity.

Complexity yes, but power isn't an issue.  Either way the PIC draws less
than 1mA, which is dwarfed by the 100mA required from the battery to power
the LEDs.




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