10.3.2.4 Commands
Reading the Flash/EEPROM and writing the page buffer is handled with normal load/store instructions. Other operations, such as writing and erasing the memory arrays, are handled by commands in the NVM.
To execute a command in the NVM:
- Confirm that any previous operation is completed by reading the Busy (EEBUSY and FBUSY) Flags in the NVMCTRL.STATUS register.
- Write the appropriate key to the Configuration Change Protection (CPU.CCP) register to unlock the NVM Control A (NVMCTRL.CTRLA) register.
- Write the desired command value to the CMD bit field in the Control A (NVMCTRL.CTRLA) register within the next four instructions.