There are a few items at
http://www.piclist.com/../microchip/rs232

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James Newton (PICList Admin #3)
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-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of David Huisman
Sent: Monday, May 01, 2000 23:01
To: PICLIST@MITVMA.MIT.EDU
Subject: Dual UART on PIC16C73


Hi all,

Has anyone here created a second software UART on the PIC16C73.
I would like to have 2 ports simultaneously operating.
The requirement only needs 1/2 duplex but I want to be able to receive 19200
Baud via the on-board hardware UART simultaneously to 9600 Baud on the Bit
bashed port.

I have written a small app in C that provides a interrupt driven software
UART.
It detects falling edge of Start bit by setting RB.0 up as External
Interrupt and when edge is detected, a state machine runs that validates the
Start bit 1/2 a period after edge falling and then uses Timer1 to read the
next 8 data bits and stop bit.

If someone has some code already written that does this, it will save me
"reinventing the wheel" and also may offer a more elegant and robust
solution.

Thanks in advance.

Regards
David Huisman

Please only reply if you can offer a solution based on the above
requirements.