Figuring out the Fixed Voltage Reference (FVR) 12F1822 (and others)

[Heckler]

Hey group,

Well I spent most of the weekend trying to figure out how to take advantage of the FVR to improve my A/D conversions.

Just when I though I'd never get it... and Darrel's (and others) hints and tips were falling into a black hole (where my brain should be), it all started to make sense.

I can now use the FVR as a reference to either reading Vdd or an outside AD input. (what fun!)

Any way one thing that is still confusing me is a note on the 12F1822 datasheet.
The FVRCON register contains a FVRRDY bit 6 that tells you when the FVR is stable.

Note 1: FVRRDY is always ‘1’ on PIC12F1822/16F1823 only

Datasheet pp. 138

So what are the ramifications of that??
Does that mean that one should include a fixed delay to give the FVR time to settle down? Or that the FVR is always ready on these chips and there is no need to wait for it?


thanks