DPRG mailing list archives: [DPRG] AVR Software UART

Mon Feb 18 12:03:26 CST 2008

Scott,

One thing I have done on several of my projects is to use a discrete
multiplexer chip like 74157 to switch the TX and RX lines to and from 2
different devices.

Good Luck,
Rick

-----Original Message-----
From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org] On
Behalf Of scott at lighthouse21.com
Sent: Monday, February 18, 2008 1:41 AM
To: dprglist at dprg.org
Subject: [DPRG] AVR Software UART

Hello all,
     I'm attempting to interface additional serial devices to an Atmel
AVR, the hardware UART is already in use.  I basically need a
bit-banged TX only module.  The only examples I can find still rely
on timers which are also in use.  Does anyone have a starting point
for developing this?  I'm clocking the AVR at 1MHz and need to put
out 9600 baud.

     Thanks,
     Scott

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