[time-nuts] An embedded NTP server

[Attila Kinali]

Hoi Bob,

On Tue, 1 Jan 2013 12:03:49 -0500
Bob Camp <lists at rtty.us> wrote:


> On Jan 1, 2013, at 11:34 AM, Attila Kinali <attila at kinali.ch> wrote:
>
> > What about those uC that use a VCO that runs up at several 100MHz (i've
> > seen up to 800MHz) and devide it down to what they actually need.
> > Shouldnt this improve jitter quite considerably?

> Most of the small micro's don't get very fancy on the clock chain.
> You are lucky if the VCO is running at twice the CPU clock. In some
> cases the input capture(s) (and PWM's)  are running directly on the
> VCO (at say 72 MHz) and the CPU is running at half  or a quarter of that. 

That's why i was specifically asking about those uC which use a higher
frequency VCO for their clock generation. Ie not the tiny 8bit stuff,
but those in the ARM7/Cortex-M3 class.

			Attila Kinali

-- 
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