I would recommend clearing out the register any time a byte arrives and
store it. This can be done by monitoring the receive flag RCIF. There will
be 1ms of time to do other processing if necessary. If you take more than
that, you are in trouble.

Maybe you can be interrupted by RCIF and handle it then.

What are you using to write code, assembly, PBP, etc.?



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of
martin_claudio@FULLZERO.COM.AR
Sent: Wednesday, June 09, 2004 3:02 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: USART overrun problem


Hi all,
i4m trying to comunicate a PC with a PIC16f874(clock 4 MHZ) , using the
USART asynchronous mode at 9600 bps. The length of each message is  8 bytes
(8bits,Non Parity,1Stop bit). This PIC has a FIFO buffer(Register RCREG) of
two bytes, so the idea is to clean the buffer before the third byte reach
the buffer, i4ve been triying to improve the code in the PIC to clean the
buffer as fast as possible, but i 4m still having this problem. Is there any
good code to avoid it? Can it be done adding hardware? Thanks  a lot
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