Do NOT use the UART BPS tables in the data sheet.  A few of the tables
are known to be incorrect.

The equation given in the data sheet is correct.  Use that to determine
spbrg.

-Adam

Rick Mann wrote:

>Hi. I'm trying to get a PIC16F877 to work at 9600 baud. It works fine at
>2400, with BRGH=0, but I can't seem to get reliable operation at 9600 with
>BRGH=1.
>
>I thought I read somewhere that one shouldn't even try to use BRGH=1, but
>all of the examples I've seen on the Microchip website and Piclist.com seem
>to do it.
>
>FWIW, it seemed to work better when the SPRG value was set to 26 instead of
>25, the value everything says I should use.
>
>I have a MAX232 from TI between the PIC and the PC. The handshaking lines
>are all hard-wired.
>
>I try to send ascii '0' through '9' from my terminal program, and display
>those values on 8 LEDs. At 2400 baud, it works great. At 9600, I get
>incorrect (although consistently) values.
>
>Any ideas? Thanks!
>
>--
>Rick
>
>--
>http://www.piclist.com hint: PICList Posts must start with ONE topic:
>[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>
>
>
>

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