1.5.3 Entire Flash Protection

The FCP Configuration Word, located in the UCAx area, allows protection of the entire Flash from ICSP read-back (CP bit) and CRC calculations by the NVM module (CRC bit).

The FPED Configuration Word in the UCB area has the PED bit, which disables Bulk Erase, Page Erase, Row and Quadword Write for the entire device Flash. When this feature is enabled (PED bit = 0), it restricts all modification of the user Flash, User OTP and UCA/UCB Configuration pages in ICSP mode. Run-Time Self-Programming code execution is unaffected by PED.

When this Program or Erase Protection feature (PED bit = 0) is used with UCB Erase Protection (FEPUCB word is 0x84C1F396), once activated, it permanently prevents the entire Flash ICSP programming and erase operations and cannot be deactivated.