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Philips P89C66x 12-Clock Mode

Discussion in 'Embedded' started by Banjo, Sep 10, 2003.

  1. Banjo

    Banjo Guest

    I'm working with the Philips 89C664HBA which is a 6-clock variant of
    the 8051. I understand (from the datasheet) that you can make this a
    12-clock part via an OTP bit accessible by a parallel programmer. I'd
    like to try the part in 12-clock mode to see if it will solve a timing
    issue in an existing design. I'm not having much luck in determining
    exactly how to do that. What bit?

    From the datasheet: "This device executes one instruction in 6 clock
    cycles, hence
    providing twice the speed of a conventional 80C51. An OTP
    configuration bit lets the user select conventional 12-clock timing if

    Should my crusty old Logical Devices Chipmaster 3000 be able to do
    this? Or will I need to purchase a programmer just to try it? What
    advertised capability would I need to look for when shopping for
    Banjo, Sep 10, 2003
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  2. It might be hidden in some high address (above the normal FLASH) but
    writable by your programmer if you can put it in the hex file. I think
    that's how it works on the P87LPC parts. Try to download the
    programming spec from Philips.. compare with the datasheet..

    Best regards,
    Spehro Pefhany
    Spehro Pefhany, Sep 10, 2003
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  3. The EEtools ChipMAX has, under the Options menu for the 89C66x series,
    a selector for x6/x12 clock.

    Jim Granville, Sep 10, 2003
  4. Banjo

    Schwob Guest

    Schwob, Sep 20, 2003
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