5.6.1.2 Password Use
Offset 3FCh is the last 32-bit word in the EEPROM memory block. If bit 31 is a ‘0’ in that word, then the location can
be treated as EEPROM data that stores only positive integers in the range 0 to 2 billion (or so). If bit 31 is a ‘1’ and the
rest of the word is not all 1's (that is, if the word is not in its initial, erased, state), then the word contains a password that
can be used to unlock the EEPROM memory block.