9.3.2.4.5 Chip Erase Command

The Chip Erase 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) or Application Code Section Write Protection (APCWP) in NVMCTRL.CTRLB. The memory will be all 1’s after the operation.