Peter Dannegger wrote:
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Exactly,

the lock bits are intended for, that all further programming operations except the full erase may fail.

So reading all ones is the correct behaviour?

Then I just have to figure out why the chip behaves (in the actual circuit) like it was programmed with all ones after setting the lock bits...

Right now I use the same algorithm and timing for programming the lock bits, as I do for programming the data area. Is that what I'm supposed to do? The description in the data sheet is not too clear.

Best regards,

Mikkel C. Simonsen