11.3.1.4 Boot Row
The Boot Row is 64 bytes of Read-While-Write (RWW) Flash. This section stores information only accessible to the boot loader, such as keys. This section is optionally erased by a chip erase controlled from the fuse settings (FUSE).
The Boot Row section can be read or written from the CPU. When erasing the Boot Row, the entire row is erased at once.
The Boot Row cannot be accessed from the application section.