10.2.1 Overview
The Nested Vectored Interrupt Controller (NVIC) in the SAM D5x/E5x family devices supports 138 interrupts with eight different priority levels. For more details, refer to the Cortex-M4 Technical Reference Manual (www.arm.com).
Note: Interrupts must be globally enabled using the
__enable_irq()
primitive before any interrupts will fire.