On Sat, Aug 03, 2002 at 05:46:16PM -0400, Michael Simpson wrote:
> The question is for the PLL option I am using a 10MHZ Resonator.   IT works
> at 10MHZ with or with out the PLL option.
>
> As far as the crystals I have tried about 20 brands and types.  I purchased
> about 10 each a few weeks ago so I could test.   At the lower frequencies
> they all seem to work. fine.  I have a few 10mhz crystals and again they
> work fine at XT or HS as 10MHZ.  But in HS/PLL they are still running at
> 10MHZ.

(sound of head scratching...)

They are supposed to run at 10 Mhz. So what exactly is the problem?

The PLL is internal and uses the 10 Mhz external signal to generate the 40 Mhz
clock internally. So there should be no change in the external appearance of
the external oscialltor.

It's supposed to run at 10 Mhz.

So I only have one question: When you enabled the HS/PLL mode did the chip
get 4 times faster than HS mode?

Lastly did you read the errata page for the 18C chips. There are some issues
on oscillator speed based on whether the chip is industrial or extended. Take
a read if you get a chance...

BAJ

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