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Bug in writing to the BS-Register?!

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  1. 2009-07-01 16:48:05 UTC
    Hello Everybody,

    I've tried for quite a while now to set the BS-Register of either a AT91SAM7X or ATMEGA16.

    It fails for both of them, I fear :(

    I can read their BS-Register fine, thought!
    I can also read their ID-CODEs.

    I'm using an ARM-USB-TINY.

    My guess so far is, that the BS-Register is just not written the way I intend.

    Here is what I do: (i chopped off the first 129 bit, just showing the last 12)

    PORTA(0) is hard wired to PORTA(3)!

    jtag> instruction sample/preload
    jtag> dr
    100101110110
    dr 100101110000
    (same except for the last three bit, which are for PORTA(0) )
    jtag> shift dr
    jtag> instruction extest
    jtag> shift dr
    jtag> dr
    100101110110

    So thats not what I would expect... it shoud rather be
    100101110100 (second last bit is now zero) or something close to it!

    Hope you have an Idea!

    Greetings from Hamburg/Germany

    - Thorsten
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