Jinx,

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. Actual operational
parameters and actual -dB cutoff points can be determined in spite of
the manufacturer's specifications.

Sincerely,
Ned Seith
Nedtronics
59 3rd Street
Gilroy, CA 95020
(408) 842-0858
ned@nedtron.com





At 10:14 PM 8/17/01 +1200, you wrote:
> > As my current timing routines are geared to 4MHz, it was my
> > objective to use the RC oscillator at 4MHz. The RC oscillator
> > wave form at 4MHz is a clean square wave with rounded upper
> > corners. The amplitude, turn on and turn off times of the wave
>
>4MHz isn't really pushing it for an F84A. 6MHz would be I think.
>Main thing is that you've got something cheap, predictable,
>repeatable etc etc
>
>I mentioned the comparison between F84/F84A and F628 to
>illustrate how the RC high end is being extended with each
>new release. I'm sure 4MHz RC on an F84A / F628 would more
>than likely be superior to that of the older F84. I'm still waiting
>for a 17C44 to upgrade my PSP so I can use F628s. AFAIK
>Microchip has still not quantitised the single R mode for the
>F628 and that was going to be one of my first little jobs. As you
>know this thread started because there was apparently no (I
>have to say easily produced) graph from Microchip for selecting
>RC values for the F84A
>
>--
>http://www.piclist.com hint: The PICList is archived three different
>ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.