Re: Sharp remote control ceramic resonator frequency?

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Article #583

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#583

From: Bob Parker
Date: Sat, 26 Mar 2005 14:49

38 lines
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Hi Brian,
   Everyone else answered your question for me! As they said, NTSC
colorburst crystals are very common and very cheap. The firmware in
the micro doesn't need a higher clock frequency than that, so that's
why I chose it.
   The micro internally divides the 3.58MHz by 8950 (179 x 50) to
produce a 400Hz reference for all its timing. It worked out pretty
well. :)

Regards,
Bob

"Brian Goldsmith" <brian.goldsmith@nospam.echo1.com.au> wrote:

>
>"Michael A. Terrell" <mike.terrell@earthlink.net> wrote
>
>
>Bob Parker wrote:
>>
>> The DSE ESR meter uses 3.58MHz.... ;)
>>
>> Bob
>
>
>   Was that because you had plenty on hand, or was it recommended for
>the microprocessor you selected? :)
>
>
>
>**** As 3.579545 MHz  is the NTSC colour burst frequency,there are millions 
>of these crystals around the world.Because of availibility and low cost,they 
>get used in all sorts of circuits.
>
>Brian Goldsmith. 
>

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From: Bob Parker <bobpdeletethis@despammed.com>
Newsgroups: sci.electronics.repair,aus.electronics
Subject: Re: Sharp remote control ceramic resonator frequency?
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