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  1. #1
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    at28c256 time for erase

    How i interface EEPROM (AT28C256) with 8051 microcontroller and i how erase this EEPROM either using GENIUS NSP universal programmer or any other eassy method.

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  2. #2
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    Re: interfacing EEPROM (AT28C256) with 8051 microcontroller

    8051 uses multiplexed address/data bus so you will have to use 74LS373 or similar to latch the lower 8 address lines.
    Example on how to do this you can find here:
    http://www.cs.ucr.edu/~vahid/courses/122a_f99/ch6.pdf

    You can use another external ROM/EPROM and write a short program to erase the EEProm, which,as in the above example, can be connected in the same way to the system as first EPROM + , say, pin P1.0 to select which of them should be used to read program.
    Try "software chip erase" option from the Atmel website:
    h**p://www.atmel-grenoble.com/dyn/products/app_notes.asp?family_id=638&part_id=1904
    Regards,
    IanP



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  3. #3
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    Re: interfacing EEPROM (AT28C256) with 8051 microcontroller

    Hi

    Check philips site for XA app note there is one app note who describe connection of the XA to parallel FLASH memory

    There is also a software for programming & writing the flash

    The philips XA hardware is the same as the 8051 hardware!

    All the best


    Bobi



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