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external memory problem

ratnakarreddy manda

hi,

i developed code for my project in AT89s52.
complete code is working properly.
now i need EEPROM,so i modified my code to AT89S8252.
my external data getting modified.
RAM test is ok.
hard ware is ok.
iam receiving data from PC through serial communication.
storing same data into external memory.
sending same data to PC.
some of the data getting modified.
plz help in this issue.

Parents
  • 0 in reply to ratnakarreddy manda

    "same code is working well with AT89S52."

    With that descriptive answer we can finally determine all possible root causes. You will figure it out from here and further reply is unnecessary. The causes are some or all of the following:

    1. A difference in the memory or its interface between the two MCU designs -- a hardware problem.
    2. A difference (or error) in the way your code is handling memory accesses -- a software problem.

Reply
  • 0 in reply to ratnakarreddy manda

    "same code is working well with AT89S52."

    With that descriptive answer we can finally determine all possible root causes. You will figure it out from here and further reply is unnecessary. The causes are some or all of the following:

    1. A difference in the memory or its interface between the two MCU designs -- a hardware problem.
    2. A difference (or error) in the way your code is handling memory accesses -- a software problem.

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