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8051 question

Discussion in '8bit Microcontrollers' started by Fritz Oppliger, May 12, 2004.

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  1. On those 8051 models that have built in XRAM, does one get to use all the
    ports that are otherwise used for AD0...AD15?
    what I'm looking for is a 8051 with 64K Flash and about 16K RAM
    and about 32 I/O pins.
  2. No.
    the internal XDATA area is accessed directly by the processor, without using
    address or data ports like for external XDATA.
    But an address is read out of the internal XDATA bank, ports will be used.
    most 805x with internal XDATA have a setup option to use or not this
    internal ram. So it is possible to use external ram only though AD ports.

    if the application works with the internal XDATA range only, ports are
    available for user I/O.

  3. Bruce

    Bruce Guest

    Check with They have the Dallas DS series 8051
    with 32, 64, or 128kB of NV CMOS SRAM.

    You set the internal partition to divide program/data code space. Access to all
    xdata space is handled internally giving you full access to all xdata without
    wasting I/O-pins.

    You set the partition to whatever size you need for program/data code space. Real
    nice chips. I've used the DS5000 series in many applications.


  4. Edwin Bland

    Edwin Bland Guest

    I believe what used to be Cygnal also has parts that fit what you're looking
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