NMI Source Select
| IRQM4 | The IRQ number of the interrupt that acts as the Non-Maskable Interrupt (NMI) for the Cortex-M4, if enabled by NMIENM4. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| IRQM0 | The IRQ number of the interrupt that acts as the Non-Maskable Interrupt (NMI) for the Cortex-M0+, if enabled by NMIENM0. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| NMIENM0 | Write a 1 to this bit to enable the Non-Maskable Interrupt (NMI) source selected by IRQM0. |
| NMIENM4 | Write a 1 to this bit to enable the Non-Maskable Interrupt (NMI) source selected by IRQM4. |