Accessing EEPROM of AT89S8252 using Assembly Language

 Accessing EEPROM of AT89S8252 using Assembly Language

hi!
i am using AT89S8252 microcontroller in one of my projects, where i have to store Passwords from user in EEPROM. I am using Keil Simulation software. I dont know how to access in-built EEPROM in AT89S8252 in assembly language. when i am using WCON, keil simulator gives error UNDEFINED SYMBOL. so plz help me out with example programs using EEPROM. Thank U.

 RE: Accessing EEPROM of AT89S8252 using Assembly Language

I've had some example code a long time ago, sorry, I can't find it now.

If register is not defined, define it yourself!
Download MCU datasheet from atmel.com, open page with memory map, see the address of WCON and type
WCON EQU addr

That's it! it will work, I also had to manually define it in my code.

 RTFM!

It's an Atmel part, so just go to the Atmel website http://www.Atmel.com

In the 'Search' box, type "AT89S8252"

The resulting page shows you the Datasheet, Errata, and the AT89S8252 Primer.

The AT89S8252 Primer contains sample assembler code for reading & writing the EEPROM.

 thank u friends.....

hey thank u very much for ur help....

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ri