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12c509 uart baudrate 115k...need some magic :)

 
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12c509 uart baudrate 115k...need some magic :)
PostPosted: Mon Jan 05, 2004 6:52 am     Reply with quote
hi,

I know with 12c509 @4Mhz not possible but I had
seen 12c509 working at that speed.
There is some trick to push 12c509 to 115 baudrate?

thanks in advance
Invisible
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jan 05, 2004 12:40 pm     Reply with quote
That chip has no UART. It has to be done in software.
The built-in CCS libraries don't support such a high baudrate.

See this Piclist page, which has links to sample code
for doing high baudrates with a 4 MHz crystal.
The code is in assembly language.
http://www.piclist.com/techref/microchip/rs232.htm
Invisible
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re
PostPosted: Wed Jan 07, 2004 5:26 am     Reply with quote
hi,

thanks for reply, yes, I know software usart is used,
I preffer faster chips but "someone" decided 12c50x without asking R&D.
Thanks for the link, I think I have there the info I needed,

best regards
Invisible
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