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interfacing EEPROM (AT28C256) with 8051 microcontroller

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quris_terris

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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.
 

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:
**broken link removed**

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
 

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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