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switch off "non maskable interrupts" with Cortex M3

Sebastian Gaertner
Note: This was originally posted on 12th May 2009 at http://forums.arm.com

The register FAULTMASK allows to enable/disable the NMI, non maskable interrupts.
I thought NMI's could generally never be switched off by the user. But with FAULTMASK = 1
I can switch off?
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