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PIC 18 Pin 40MHz 4K 7A/D - 18F1320

Replacement: None. There is no direct replacement for this IC. It has been retired due to slow sales. This page is for reference only.

Microchip's 18F1320 8-Bit Processor. 4K of program space and 16 I/O lines, 7 of which are 10bit Analog to Digital converter capable. Runs up to 40MHz in conjunction with the internal PLL and an external 10MHz crystal, or can also be run up to 20MHz with an external 20MHz external crystal. Check datasheet for more information on oscillator settings. Package can be programmed in circuit.


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  • "...or can also be run up to 20MHz with an external 20MHz external crystal." Externally nifty!
    Also, what happens if you run this at, say, ~25MHz with an external crystal? Does it divide by zero and blow up the universe or something? I ask because I have an idea which requires it to work at 25.175 MHz.
    Note that, according to the datasheet, this should be possible... I'm just confused ;)

    • This PIC can either use a crystal directly (20MHz crystal, 20MHz clock) or you can patch in an internal PLL that will multiply the crystal by four (10MHz crystal, 40MHz clock).
      If you want it to run at 25.175MHz, you can either use the PLL, and feed it a 6.29375MHz frequency (25.175 / 4), or you could try running it a little over spec with a 25.175MHz signal. They make these with some headroom over the clock specs; Nate even did a tutorial on overclocking PICs.

  • Looks like the datasheet link is messed up. Product page is here:
    and the datasheet is here:

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