1.5.2 User Configuration Ax and B Areas Protection

The FCP Configuration Word, located in UCAx, has WPUCA bits which can disable Page Erase and Write operations on the UCAx area. The UCAx area is always erased on Bulk Erase.

Two Configuration Words located in the UCB area, if programmed with special keys, disable erase or write operations on the UCB area. FEPUCB, when programmed with 0x84C1F396, permanently disables all ability to erase the UCB page via both Bulk Erase and Page Erase NVM commands. FWPUCB, when programmed with 0x5B9B12E4, permanently disables all ability to write further data to the UCB page. FEPUCB Erase Protection and FWPUCB Write Protection applies to both ICSP and Run-Time Self Programming code execution. If both UCB Program and Erase Protection are activated, it permanently prevents UCB programming and erase operations, and cannot be deactivated.