The Chip Erase (CHER) command erases the Flash and the EEPROM. The EEPROM is unaltered if
the EEPROM Save During Chip Erase (EESAVE) fuse in FUSE.SYSCFG0 is set. The Flash will not
be protected by Boot Section Lock (BOOTLOCK) bit or Application Code Section Write
Protection (APCWP) bit in NVMCTRL.CTRLB register. The memory will be all
‘1’s after the operation.