AVR-Chat

While we are at it (EMI) one should probertly also connect a 10nF capacitor
to the last unused XTAL2 output to balance the pierce.
 
On the MASTER a 1Mohm between XTAL1/2 and a series resistor from XTAL2 to
crystal of a hundred ohms is a good idea. take output from XTAL2 pin
directly through a second resistor (100R) to the XTAL1 pin of a slave. 
 
Regards
Lasse
 
  _____  

From: Dave VanHorn [mailto:dvanhorn@dvanhorn.org] 
Sent: 4. januar 2005 14:43
To: AVR-Chat@yahoogroups.com
Subject: RE: [AVR-Chat] multiprocessing with AVR (2)
 
At 08:14 AM 1/4/2005, you wrote:

>No . look at the oscillator schematics . it's a standard pierce .
>
>XTAL1 = Input
>XTAL2 = Output
>
>MASTER CHIP:  Crystal between XTAL1 and XTAL2 with 2 decoupling caps.
>
>SLAVE CHIP #1: Connect XTAL1 to MASTER XTAL2
>
>SLAVE CHIP #2: Connect XTAL1 to SLAVE CHIP #1 XTAL2
>
>SLAVE CHIP #3: Connect XTAL1 to SLAVE CHIP #2 XTAL2
>

You're well advised to add a series resistor, up close to the package, on 
XTAL2, to reduce EMI,
That. and a solid ground return path.



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