29.8.3 Non-Maskable Interrupt Flag Status and Clear
Important: For SAM
        L11 Non-Secure accesses, read and write accesses (RW*) are allowed only
            if the NMI interrupt is set as Non-Secure in the NONSEC register (NONSEC.NMI
            bit).
      | Name: | NMIFLAG | 
| Offset: | 0x2 | 
| Reset: | 0x00 | 
| Property: | Mix-Secure | 
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| NMI | |||||||||
| Access | RW/RW*/RW | ||||||||
| Reset | 0 | 
Bit 0 – NMI Non-Maskable Interrupt
This flag is cleared by writing a '1' to it.
This flag is set when the NMI pin matches the NMI sense configuration, and will generate an interrupt request.
Writing a '0' to this bit has no effect.
