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  • USB Internal Oscillator Setting

    I've used the serial programmer for some time and now have the usb programmer. The old GUI had "internal oscillator". The new one has two choices for internal: 'INTOSC clockout' and 'INTOSCIO'. I can't find the description of these. Simply want to use the internal oscillator on a 16F672. Thanks, Keith

  • #2
    Hi Keith,

    I don't think Microchip makes a 16F672.
    Maybe you meant the 16F627.

    At any rate, the difference between the two options relates to the OSC2 pin.

    'INTOSC clockout' would put out FOSC/4 on the OSC2 pin continuously.
    A 4Mhz internal OSC will produce a 1Mhz output on OSC2.

    Plain 'INTOSC' allows both the OSC1 and OSC2 pins to be used as general I/O.
    PBP3 Manual : Microchip Datasheets - 10F, 12F, 16F, 18F
    Never download a PIC datasheet from anywhere but microchip.com

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    • #3
      Thanks Darrel. Yes, '627; that'll teach me to rely on my memory now only enough room for logic decisions.
      Thanks for that info. Couldn't find source for it.-Keith

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      • #4
        The place to look is in the 627's datasheet section 14-11 CONFIGURATION WORD.
        For the oscillator selection (bit4, 1-0) you'll see this ...



        Then a little further down (14.2.7) it says what CLKOUT means.



        HTH,
        PBP3 Manual : Microchip Datasheets - 10F, 12F, 16F, 18F
        Never download a PIC datasheet from anywhere but microchip.com

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