linux-kernel - Re: [PATCH] Documentation about RS485 serial communications

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Message-ID: <i9ka0s$4ua$1@dough.gmane.org>
Date:	Tue, 19 Oct 2010 14:29:48 +0000 (UTC)
From:	Grant Edwards <grant.b.edwards@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation about RS485 serial communications

On 2010-10-19, Claudio Scordino <claudio@...dence.eu.com> wrote:

> +2. HARDWARE-RELATED CONSIDERATIONS
> +
> +   Some CPUs (e.g., Atmel AT91) contain a transceiver capable of working both
> +   as RS232 and RS485.

Pardon my curiosity, but I've looked at a few AT91 parts, and I've
never seen on with an internal transceiver -- nor does Google seem
able to find any.

Frankly, I'd be pretty surprised, since it would be very difficult
(fab-wise), to build a mircoprocessor with I/O cells capable of
withstanding the voltage levels specified in RS232.

Can you specify to which parts you're referring?

-- 
Grant Edwards               grant.b.edwards        Yow! I have the power to
                                  at               HALT PRODUCTION on all
                              gmail.com            TEENAGE SEX COMEDIES!!

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