10.3.2.4.7 Write Fuse Command

The Write Fuse (WFU) command writes the fuses. It can only be used by the UPDI; the CPU cannot start this command.

Follow this procedure to use the Write Fuse command:
  1. Write the address of the fuse to the Address register (NVMCTRL.ADDR).
  2. Write the data to be written to the fuse to the Data register (NVMCTRL.DATA).
  3. Execute the Write Fuse command.
  4. After the fuse is written, a Reset is required for the updated value to take effect.

For reading fuses, use a regular read on the memory location.