Jinx wrote:
>
> > I have found that good quality decade resistance substitution
> > boxes and decade capacitance substitution boxes in
> > conjunction with a good scope will resolve most RC circuit
> > concerns very quickly.
>
> Granted, but not everyone has access to those. Looking
> through data books of other micros I use, RC seems to be
> quite a neglected feature. Only the book for the Motorola
> 68HH705K1 (which I used a lot before the F84) goes into
> RC in any detail, including an RC v freq graph. No other
> Mot I'm aware of has RC. The Zilog Z8 books merely say
> that RC or even LC can be used, AVRs I'm familiar with
> don't have either RC or internal oscs (except for WDT). I
> wonder how many people actually even consider RC as
> an option and needlessly spend money on crystals or
> resonators. If they were more aware of RC and had an
> accurate way (on paper) of determining values perhaps
> RC would be first choice. I have to admit I myself tend to
> reach for the crystal box rather easily

Obviously not great for timing sensitive stuff,
but I like the RC oscillator. It has a reliability
that you won't get with a vibrating crystal or
resonator. It doesn't rely on mech vibration,
won't wear out like a crystal or resonator, wont
glitch or fail on physical shocks, usually smaller
and cheaper, etc etc. Not every project needs
a perfect accuracy clock. :o)
-Roman

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