AVR-Chat

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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