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Chip Enable Input

Discussion in 'Electronic Basics' started by Boki, Apr 19, 2005.

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  1. Boki

    Boki Guest

    Hi All,
    Simple questions.

    What is Chip Enable ? ( a PIO of flash memory )

    All other PIO will only funtion correct until Chip Enable is high?

    Best regards,

  2. Yes. It allows you to select amongst different peripherals.
    The correct level, Low or High is according to the datasheet.

  3. Pooh Bear

    Pooh Bear Guest

    Chip Enable is usually active *low* in fact.

    When CE isn't asserted, it's as if the chip wasn't there essentially.

  4. Lord Garth

    Lord Garth Guest

    When CE is false (low), the outputs and inputs are in tri-state or high
    impedance, it is as if
    the chip were not there. In fact the chip goes into a low power state for
    drain on the supply. Micro amps of drain is common in this mode.

    CE must be true (high) for the device to operate.

    OE or Output Enable allows for the address bus (and select logic) to access
    the device without
    causing data to appear on the data bus. Think of an EEPROM which is being
    written, you
    would not want the data, which is being changed, to be available until the
    write operation
    is finished.
  5. Boki

    Boki Guest

    Got it!
    Thank you all for the information.

    Best regards,
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