Re: Atmel AVR STK500 XT1 & XT2 pins?

From: Rich Webb (bbew.ar_at_mapson.nozirev.ten)
Date: 03/11/04 

Date: Thu, 11 Mar 2004 00:00:37 GMT

On Wed, 10 Mar 2004 11:39:37 -0500, RajW <rajw@intelc64.net> wrote:

>
>Simple noobie question about the Atmel AVR STK500...
>
>Can the XT1 and XT2 pins on PORTE\AUX used to supply a clock signal to
>an external device (explanation below)?
>
>As I am learning to program and interface the AVR's I have a 16550
>UART on a separate experiment board and I see that the 16550 needs a
>crystal or clock source on pins 16 and 17 (XIN and XOUT)... can the
>XT1 and XT2 pins be used to supply the clock source or do I need a
>separate crystal?

You won't be able to use Port E's XT1 and XT2 "as if" they were a
crystal and connect them to the 16550's XIN and XOUT. You may be able to
pull the clock from XT1 and drive XIN with it, though. 

-- 
Rich Webb   Norfolk, VA