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  1. #1
    Join Date
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    Default 16F1827 - Slow Clock

    Apparently there is something I do not see. And is 3.30 am...

    The following settings make the PIC run at 1/4 the speed it is supposed to.

    Code:
    #config
      __config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_ON & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_OFF & _FCMEN_OFF
      __config _CONFIG2, _WRT_OFF & _PLLEN_ON & _LVP_OFF & _STVREN_OFF ;& _BORV_25
    #endconfig
    
    DEFINE OSC 32
    If I set the DEFINE OSC at 8 then the speed is as expected. But the above config is for 8 x 4 PLL = 32MHz...

    Where am I wrong?

    Ioannis

  2. #2
    Join Date
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    Default Re: 16F1827 - Slow Clock

    osccon=$70


    or

    & _PLLEN_OFF


    osccon=$F0


    also


    it takes a little time for pll to stabilise

    while !oscstat.6 : wend ;wait for pll ready
    Last edited by richard; - 22nd June 2018 at 02:44.
    This is more entertaining than Free to Air TV

  3. #3
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    Default Re: 16F1827 - Slow Clock

    Hmm, I did OSCCON=$F0 but at the same time & _PLLEN_ON.

    Does it matter?
    Ioannis

  4. #4
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    Default Re: 16F1827 - Slow Clock

    you would think not , but I have been using mplabx/mcc mostly lately and for some chips it does indeed matter it seems.
    soft selecting pll always works so that's what i'm used to doing ,
    This is more entertaining than Free to Air TV

  5. #5
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    Default Re: 16F1827 - Slow Clock

    And it does work as expected!

    Thanks Richard.

    Ioannis

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