Cortex M4 MQX uses "cpsid.n i" instruction - what is the ".n"?

[ianwilson]

Hi all,

The file mqx\source\psp\cortex_m\core\M4\dispatch.S uses both:

  cpsid i

and

   cpsid.n i

instructions.

I have looked but can't see any documentation on what the ".n" suffix does.

Sorry if the answer is buried in an ARM document somewhere.  I did search.

Many thanks,

Ian

[danielchen]

Hi wilson:

.n  means narrow instruction, decode with 16 bits

Regards

Daniel