Re: Adding serial ports to ARM-based board
From: Leon Heller (leon_heller_at_hotmail.com)
Date: 04/09/04
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Date: Fri, 9 Apr 2004 07:18:46 +0100
"stan" <ssg97@hotmail.com> wrote in message
news:c4237bbc.0404082159.2b375fb0@posting.google.com...
> Hello. I got sharp 79520 arm board. The processor basically has 2
> UARTS and we need at least 3 more serial ports for our design.
> What are the options to add 3 more serial ports (with baud rate up to
> 112k)?
> any design ideas you can suggest?
Where I used to work I designed a serial comms hub using a mid-range PIC
with SPI and four '2313 AVRs as UARTs, communicating with the PIC via
bit-banged SPI. It ran at 115k, and could have used more '2313s for
additional serial ports. The '2313s used their on-chip RAM for buffers.
Another option is to use Maxim SPI UARTs.
Leon
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