Re: [AVR-Chat] Re: Help for circuit design
2008-04-16 by kholt@sonic.net
With this much frequency change, it appears that the crystal is dead
or unconnected, and the oscillator is running on capacitance only.
Ken
On Wed 04/16/08 6:28 AM , "Dennis Clark" dlc@frii.com sent:
> Fuse setting are ok. But the problem is that my crystal frequency
is not
> stable everytime. For example if i am using a crystal of 1.8432MHz
with
> 22pf capacitor the output frequency is nearly 2.2 MHz, but when i
replace
> the capacitor by 27pf the output frequency is nearly 1.9 Mhz. So
Now i am
> cofused, how to choose capacitor so i get stable frequecy as per
crystal.
I think that you've answered your own question with your
observations.
A higher value cap gives greater stability. The higher value tends
to
slow the clock startup time, but in most cases I don't think that is
an
issue.
DLC
> R.P.Modi
>
>
> ----- Original Message ----
> From: David Appleton
> To: AVR-Chat@yahoogroups.com [2]
> Sent: Tuesday, 15 April, 2008 5:21:06 PM
> Subject: [AVR-Chat] Re: Help for circuit design
>
> Check your fuse settings.
>
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> From Chandigarh to Chennai - find friends all over India. Go
to
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--
Dennis Clark
TTT Enterprises
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