Baud Rate Issue with 8MHz Crystal


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  1. #1
    Join Date
    Sep 2005
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    Post Baud Rate Issue with 8MHz Crystal

    Hi All,

    I need to reach a baud rate of 115200 and I have a Dev Board that only has an 8MHz Crystal, and normally I need at least 16MHz to reach that speed. I am using a 18F87J50 which is on the Dev Board. Do you think I could do something fancy using the Internal OSC to help generate the speed for 115200?

    Any help would be greatly appreciated,

    Regards,

    Gavo

  2. #2
    Join Date
    Mar 2003
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    Commerce Michigan USA
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    Default Re: Baud Rate Issue with 8MHz Crystal

    Why not use the 4xPLL with your 8mhz xtal?
    Dave Purola,
    N8NTA
    EN82fn

  3. #3
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    Default Re: Baud Rate Issue with 8MHz Crystal

    Thanks Dave, the problem is I can't see it in the Configuration Bits like the 18F26K22?

  4. #4
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    Default Re: Baud Rate Issue with 8MHz Crystal

    Gavo, Look on page 36 of the 18F87J50 data sheet. It's all right there....
    Dave Purola,
    N8NTA
    EN82fn

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