4.6.6 Device Default Condition

The AT25128B/AT25256B is shipped from Microchip to the customer with the EEPROM array set to an all FFh data pattern (logic ‘1’ state). The Write-Protect Enable bit in the STATUS register is set to logic ‘0’ (the ability of the EEPROM array to write is dictated by the values of the Block Write‑Protect bits while the STATUS register’s ability to write is controlled by the WEL bit). The Block Write Protection bits in the STATUS register are set to logic ‘0’ (no write protection selected).