AVR-Chat

Well, the thing is that I don't want it to be possible to get the hex-code in any way. Like, programming it, disabling every way to read the flash
and that's it. So actually, write-access would be aloud if the hex-code is erased in the same time...

Manne


> However, if you disable the SPI then you have done so permanently if all
> that you have is an AVR ISP or ISPII.  You'll need a STK500 and a
> soldering iron to get it back.
>
> DLC
>
>> On Tue, 23 Oct 2007 16:32:33 +0200 (CEST)
>>  "Manne Tallmarken" <mannet@kth.se> wrote:
>>> Is it possible to permanently disable all kinds of
>>> read/write operations to the flash?
>>>
>>> Regards,
>>>
>>> Manne
>>>
>>
>> I don't believe that you can, PERMANENTLY. If the device
>> can be parallel programmed, the fuses can be over-ridden by
>> erasing the flash (or something like that). Also, devices
>> with SPM operation can write to flash, I believe, if it is
>> run from the proper code space no matter what the fuses are
>> set to.
>>
>> That is my understanding of such things.
>>
>> Jim Wagner
>> Oregon Research Electronics, Consulting Division
>> Tangent, OR, USA
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