On Fri, Jul 6, 2012 at 12:45 PM, Larry Barello  wrote:
> I believe xmega automatical disable interrupts for one cycle after anything
> that touches the stack and or int priority registers (it has been a few
> years so I might have some details wrong).

Thank you.

That would be this in the XMega Manual:

To prevent corruption when updating the Stack Pointer from software, a
write to SPL will auto-
matically disable interrupts for up to 4 instructions or until the
next I/O memory write.

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