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Problem with AT89C51ED2 --EEPROM!

Murali S

Hi Keil,

I have written the follwing code for writing the byte in EEPROM in ED2. The Problem is BUSY flag is not being cleared.

while(!(EECON & 0x01)) ;
EA = 0;
EECON |= 0x02;

XBYTE[0X0055] = 'C';

EECON |= OxOO;
EA = 1;

Please provide the suggesion.

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  • 0

    hi,

    while(!(EECON & 0x01)) ;
EA = 0;
EECON |= 0x02;

XBYTE[0X0055] = 'C';

EECON |= OxOO;
EA = 1;

    First of all, you should wait till EEBUSY has been set to zero. Your while() waits for the flag will be set to '1' -- that's wrong.
    Another issue is: to disconnect EEPROM you should use AND but your code shows OR.
    In sum:

    while(EECON & 0x01)
   ;
EA = 0;
EECON = 0x02;
XBYTE[0X0055] = 'C';
EECON = OxOO;
EA = 1;


    If the code above is still not work please post assembly code generated by compiler.

    Regards,
    Oleg

Reply
  • 0

    hi,

    while(!(EECON & 0x01)) ;
EA = 0;
EECON |= 0x02;

XBYTE[0X0055] = 'C';

EECON |= OxOO;
EA = 1;

    First of all, you should wait till EEBUSY has been set to zero. Your while() waits for the flag will be set to '1' -- that's wrong.
    Another issue is: to disconnect EEPROM you should use AND but your code shows OR.
    In sum:

    while(EECON & 0x01)
   ;
EA = 0;
EECON = 0x02;
XBYTE[0X0055] = 'C';
EECON = OxOO;
EA = 1;


    If the code above is still not work please post assembly code generated by compiler.

    Regards,
    Oleg

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