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From: Fred Bloggs
User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0
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Subject: Re: Querry, Kick Starting Crystal Oscilator.
References: <3DCA905A.59FD928B@mmm.com.DELETETHIS> <3DCAE105.6CAAD7B9@mmm.com.DELETETHIS> <3DCBDC8E.2E54EBC@mmm.com.DELETETHIS>
Date: Sat, 09 Nov 2002 04:21:43 GMT
NNTP-Posting-Date: Fri, 08 Nov 2002 20:21:43 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
Roy McCammon wrote:
> Jim Thompson wrote:
>>|Just looking at the specs on the processor.
>>|use this crystal in this circuit and wait this long).
>>Can you reference a processor data sheet?
> Jim, I cannot reveal the processor, but it is nothing
> special in this regard. You simply hang a 32KHz crystal
> on it and it oscillates after a while. The reference
> design holds the chip in reset for 2.1 seconds for
> the purpose of letting that oscillator start. The
> manufacturer isn't much help (they are digital guys).
> All they say is they don't know how fast it starts
> and that we better stick to the reference design.
> So, I assume its a parallel resonant design and
> that I might couple in a start up signal from
> a cmos 555 via a 1pf cap and then once the processor
> gets going, it would quench the 555.
This can't be an ordinary processor. Is there something like a built-in
PLL or some other form of timing generator that requires complete
start-up and stabilization of the 32KHz? If so, then an external clock
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