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'RC or crystal ?'
1997\06\04@082852 by Antonio Almeida

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I need to use the 16C63 SCI at 300baud, can i use a RC oscillator or, to
keep it stable, i need to use a crystal? Also, which is the best way in
current terms ?

Thanks,

Antonio Almeida

1997\06\04@095851 by Sergey Kozlov

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----------
> Fr: Antonio Almeida <spam_OUTdeec352TakeThisOuTspamTOM.FE.UP.PT>
> : RC or crystal ?
>
> I need to use the 16C63 SCI at 300baud, can i use a RC oscillator or, to
> keep it stable, i need to use a crystal? Also, which is the best way in
> current terms ?
You may use RC oscillator and calibrate the value for baud rate of USART,
if use 32kHz crystal on TMR1.
I can post souce code for this calibration (I use 4800baud).
Another idea is calibrate baud rate value by recive the knoun sequence
(0,0,0,...) at the beginning.

Sergey
.....ksKILLspamspam@spam@dialup.comlink.khakassia.ru

1997\06\04@115833 by Harold Hallikainen

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On Wed, 4 Jun 1997 13:25:07 +0000 Antonio Almeida <deec352spamKILLspamTOM.FE.UP.PT>
writes:
>I need to use the 16C63 SCI at 300baud, can i use a RC oscillator or,
>to
>keep it stable, i need to use a crystal? Also, which is the best way
>in
>current terms ?
>


       I think an RC would not be stable enough.  I'd suggest using a
resonantor with built in capacitors.  I've had good luck with ones from
muRata running a 16c74a at 16 MHz.

Harold

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