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???
05/24/07 08:30
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 		 #139725 - Non-Volatile Storage required
Responding to: ???'s previous message
Syed Saleem said:
1. to have password that can be changed by authenticated user

The term you are looking for is Non-Volatile Storage

There are many ways to achieve this, eg:
  • "EEPROM" maybe on-chip, or maybe externally-connected (usually via a serial interface such as I2C, SPI, or Microwire);

  • Battery-Backed RAM;

  • Your device may have on-chip Flash that can be used for data storage - you will have to check the Datasheet for details;

  • Other technologies - such as FRAM

    i tried using using 'const' qualifier

    'const' means what is says - the data is read-only;
    You need writable storage that doesn't lose its content on a reset or power-cycle!

    the solution should only make use of only the internal memory

    So check the Datasheet to see what's available.

    i am using "keilc" compiler


    I presume you mean Keil C51?
    http://www.keil.com/c51/

    What version do you have?


    • List of 12 messages in thread
    TopicAuthorDate
    storing constants            01/01/70 00:00      
       Non-Volatile Storage required            01/01/70 00:00      
          version of keil            01/01/70 00:00      
          not on this one            01/01/70 00:00      
          battery backed            01/01/70 00:00      
             yse a FRAM or EEPROM            01/01/70 00:00      
                I don't think the customer will like this... :-)            01/01/70 00:00      
                   Good catch, Jan            01/01/70 00:00      
             Battery can be removed            01/01/70 00:00      
                not for that reason            01/01/70 00:00      
                   hidden password            01/01/70 00:00      
       Secure EEPROM?            01/01/70 00:00      

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