Carolina,

Just do a comparison of what you receive versus the Ascii code for "a".
You can do this several ways,
But I would subtract one from the other, and then check the "Z" flag in
the STATUS register.  If after
The subtraction, the "Z" flag is a "1", they are the same and you have
indeed received an "a".  If the 
"Z" flag is not a "1", then you have received something other than an
"a", so you can continue what you
Were doing.  Hope this helps.


 
Regards,

	
Jim 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Carolina Dieguez
Sent: Friday, May 25, 2007 2:57 PM
To: piclist@mit.edu
Subject: [PIC]

A Visual Basic Application is sending to my PIC circuit a string 'a'.
How can I recognize letter 'a' is being received by my PIC 16F873A??

Can my PIC read strings or identify this "a" in another way?

I need to know whether I'm receiving an "a" because if this is so, I
must enable an interruption.

Many thanks in advace for your help and support.

Carolina.
--
http://www.piclist.com PIC/SX FAQ & list archive View/change your
membership options at http://mailman.mit.edu/mailman/listinfo/piclist

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist