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 (NVMCTRL.ADDR) register.
- 2.Write the data to be written to the
fuse to the Data (NVMCTRL.DATA) register.
- 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.