40Mhz


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Thread: 40Mhz

  1. #1

    Smile 40Mhz

    Hello everybody!!

    Does anybody know if the Pic 18F4550 works with a 40 Mhz crystal in HS mode?? If not, does anybody has a hint??

    Thanks to all of you.

  2. #2
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    Smile The PIC18F4550

    Hi Armando,

    I haven't used the PIC18F4550, yet.

    Take a look at this thread:
    http://www.picbasic.co.uk/forum/showthread.php?t=4086
    Quote Originally Posted by Bruce
    Is this a 40MHz crystal (I.E. one requiring parallel caps) or is it a 40MHz TTL
    clock oscillator?
    Quote Originally Posted by Bruce
    Above 25MHz, you'll need a TTL type clock oscillator. HS and HSPLL support
    up to 25MHz primary osc.

    Make sure you have the latest verion of the 4550 data sheet rev DS39632C
    and look in the electrical characteristics section at table 28-8, parameter 1A.

    With a 40MHz TTL type clock oscillator, and EC or ECIO oscillator modes, it
    should work fine.


    CONFIG PLLDIV=10,CPUDIV=OSC1_PLL2,USBDIV=2,FOSC=ECIO_EC
    -Adam-
    Ohm it's not just a good idea... it's the LAW !

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