10.5.3 NVMLOCK

NVM write and erase operations require writing 0x55 then 0xAA to this register immediately before the operation execution.
Name: NVMLOCK
Offset: 0x042

Nonvolatile Memory Write Restriction Control Register

Bit 76543210 
 NVMLOCK[7:0] 
Access WOWOWOWOWOWOWOWO 
Reset 00000000 

Bits 7:0 – NVMLOCK[7:0]

Reading this register always returns ‘0’.