Locked ATMEGA8

Discussion in 'Embedded Systems and Microcontrollers' started by allahjane, Dec 15, 2012.

  1. allahjane

    allahjane Thread Starter Member

    Joined:
    Sep 19, 2012
    Messages:
    75
    hello there

    I have a ATMEGA8 that I flashed with a AVR programmer. I think I messed up some of the Fuse bits unintentionally .

    Now the the code I had flashed runs fine (without any external crystals) but I cannot re-flash (reprogram) the that microcontroller.
    the programmer just refuses to identify anything is in its socket!

    No, the programmer is okay as it can program other MCUs.

    I am assuming I may disable the Serial programming interface of the MCU

    If you think there could be some other problem please notify me.

    is there anyway i can re-program the MCU to be used again?
  2. MrChips

    MrChips Moderator Staff Member

    Joined:
    Oct 2, 2009
    Messages:
    10,098
    The short answer is NO.
  3. bug13

    bug13 Active Member

    Joined:
    Feb 13, 2012
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    835
    Location:
    The Hobbit Island (NZ), UTC +12
    Try high voltage programming, but if you don't have the high voltage programmer easily available, I would just buy another chip.

    from http://en.wikipedia.org/wiki/Atmel_AVR
  4. hgmjr

    hgmjr Moderator Staff Member

    Joined:
    Jan 28, 2005
    Messages:
    9,030
    Location:
    Tennessee, USA (GMT-6)
    I agree with bug13. I have experienced the occasional setting of a fuse that rendered the AVR that I was using to become temporarily unprogrammable. The high voltage parallel programming (HVPP) approach has always allowed me to recover.

    hgmjr
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