"locked" PIC

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Discussion in 'Embedded Systems and Microcontrollers' started by mik3, Jul 18, 2008.

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  1. Jul 18, 2008 #1
    mik3

    Thread Starter Senior Member

    Feb 4, 2008
    4,846
    69
    hi guys,
    I bought some new PIC18f4685, I programmed two of them 3-4 times and now i cant program them any more. It seems they have been locked. I cant see the reason because the configuration bits are not set to code protection. If the configuration bits were wrong then i couldnt program it for a second time but i did 3-4 times and then it locked. Now, i am afraid to program the others because they may get locked.

    Do you know why this happens?
     
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  2. Jul 19, 2008 #2
    bertus

    Administrator

    Apr 5, 2008
    18,374
    3,523
    #2 Reply
  3. Jul 20, 2008 #3
    n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    5
    Can you read them (either program memory or EEPROM)? Try erasing the entire chip first and see what happens.
     
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  4. Jul 20, 2008 #4
    mik3

    Thread Starter Senior Member

    Feb 4, 2008
    4,846
    69
    I cant read them, it reads only FFFF. I erased all the chip from the programmers options but nothing changes. Is there any other ways to erase the chip?
     
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