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Date: Tue, 19 Oct 2010 17:27:27 +0200 From: Alexander Stein <alexander.stein@...tec-electronic.com> To: linux-arm-kernel@...ts.infradead.org Cc: Grant Edwards <grant.b.edwards@...il.com>, linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org Subject: Re: [PATCH] Documentation about RS485 serial communications On Tuesday 19 October 2010, 16:29:48 Grant Edwards wrote: > 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? I doubt the AT91 do have an internal transceiver but it has a dedicated pin feature (RTS or CTS or something) which can be used to switch between RS232 and RS485 by setting a bit in the USART provided the pin is connected properly. Regards, Alexander -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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