Programming ATMega8515

Discussion in '8bit Microcontrollers' started by russ lyttle, Apr 15, 2008.

  1. russ lyttle

    russ lyttle Guest

    I'm trying to program ATMega8515's using STK500 and have not had any
    luck. I've programmed ATMega16's and AT90S8515 OK with 3 Stk500 boards,
    but get device ID errors with ATMega8515's. I've also looked on the
    Atmel site, but haven't found the right FM to read.
    russ lyttle, Apr 15, 2008
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  2. russ lyttle

    Tom Guest

    Is your STK-500 firmware up to date?
    Tom, Apr 15, 2008
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  3. russ lyttle

    Rich Webb Guest

    The "usual" problem with programming AVRs is that they typically
    (all?) come from the factory set to use the internal RC oscillator as
    the clock source and that oscillator is typically (always?) set, or
    divided down, to 1 MHz.

    If the STK500's programming clock is higher than 1/4 of that then
    programming will fail. Check the "settings" button under the Main tab
    from the STK500 window in AVR Studio.

    A good test is to *always* do a signature check before trying to
    program. If the signature is wrong or cannot be read then something's

    Once you're talking to it reliably, set the fuses as needed if you're
    using an external clock source or crystal.
    Rich Webb, Apr 15, 2008
  4. russ lyttle

    russ lyttle Guest

    Thanks for the reply
    Perhaps not. I updated AVR studio4, then updated firmware with the
    version on my harddrive. Where do I find for sure the latest firmware?
    russ lyttle, Apr 16, 2008
  5. russ lyttle

    russ lyttle Guest

    On all ATMega8515 the signatures read 0x1E 0x93 0x01 with a warning that
    the signature doesn't match the selected device. On ATMega8515L nothing
    is readable, neither signature or fuses.
    The clock is set for 28k
    Firmware version is 0x020a
    russ lyttle, Apr 16, 2008
  6. russ lyttle

    Rich Webb Guest

    An Atmega8515's signature should be 0x1E 0x93 0x06, where 0x1E is the
    manufacturer (Atmel), 0x93 is memory size (8K), and 0x06 is a
    sequential code for that memory size.

    The signature you're getting is for the older AT90S8515.
    Rich Webb, Apr 16, 2008
  7. russ lyttle

    russ lyttle Guest

    Now that is strange. Although plainly marked as ATMega8515, the do
    program as AT90S8515. I'll have to find out where purchasing got them.
    thanks a lot
    russ lyttle, Apr 16, 2008
  8. russ lyttle

    Tom Guest

    When you install a newer version of Studio it will read the firmware in
    the STK500 and tell you if it needs to be updated, and will do it from
    within the program.
    Tom, Apr 17, 2008
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