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switch off "non maskable interrupts" with Cortex M3

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?

Sebastian Gaertner over 12 years ago

Note: This was originally posted on 14th May 2009 at http://forums.arm.com

right, only hard faults can be switched off. But never NMIs.

Bye
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Felix Varghese over 12 years ago

Note: This was originally posted on 1st June 2009 at http://forums.arm.com

Yup, NON-MASKABLE interrupts get their name from the fact that they cannot be turned off !!
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guestposter guestposter over 12 years ago

Note: This was originally posted on 13th May 2009 at http://forums.arm.com

Hi there, the FAULTMASK does not stop the processor from taking NMI.
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switch off &quot;non maskable interrupts&quot; with Cortex M3

switch off "non maskable interrupts" with Cortex M3