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atomic and IEN

Hello all,
I have seen an old post a while ago discussing an interesting problem but I just don't seem to be able to find it: Somebody described an interesting experiment that demonstrated that setting IEN to 0 does not shut down interrupt immediately but after a couple of clock cycles. If I remember correctly, he suggested solving the problem like this:

_atomic(0) ;
IEN = 0 ;

Is there indeed a reason to be worried given the prefetch pipeline?

Thanks in advance,
Tamir Michael

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