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Re: [avr-chat] at90can128 async crystal

From: Joerg Wunsch
Subject: Re: [avr-chat] at90can128 async crystal
Date: Mon, 19 Sep 2005 07:07:00 +0200 (MET DST)

Daniel Kruszyna <address@hidden> wrote:

> Does the at90can128 require capacitors to ground on the
> tosc{1,2} pins when using timer0 in asynchronous mode?

I think that's more a question of your crystal rather than the
processor.  Quite often, the capacitance of the inputs and circuitry
suffices as crystal load, but if your crystal specifies more than some
10 ... 20 pF, you probably need to add external Cs.  Also, if you
don't add a trimmable C, take precautions to trim in software if you
need the precision.

cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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