6.2 Example

Non-Maskable Interrupt configuration, CRCSCAN

// io.h includes the device header file with register and vector defines
#include <avr/io.h>
// interrupt.h contains the ISR related content
#include <avr/interrupt.h>

void nmi_example(void) {
    // Configure the CRCSCAN peripheral with NMI
    CRCSCAN.CTRLB = CRCSCAN_MODE_PRIORITY_gc | CRCSCAN_SRC_FLASH_gc;
    CRCSCAN.CTRLA = CRCSCAN_NMIEN_bm | CRCSCAN_ENABLE_bm;
}

ISR(CRCSCAN_NMI_vect) {
    // If the CRC scan fails, the NMI interrupt will be handled here
    // The NMI request remains active until a system Reset, and can not be disabled
    
    // Check if level 0 or 1 ISRs were interrupted
    if (CPUINT.STATUS & (CPUINT_LVL0EX_bm | CPUINT_LVL1EX_bm) {
    
    }
}