11.5.2 Control B

Setting this bit to ‘1’ prevents further updates of FLMAP[1:0]. Only a Reset can clear this bit.

Select which part (in blocks of 32 KB) of the Flash will be mapped as part of the CPU data space and accessible through LD/ST instructions. Changing this bitfield value doesn't affect devices with 32 KB or less Flash size, as the entire Flash is mapped to the CPU data space.

Writing a ‘1’ to this bit protects the EEPROM from further writes.

This bit can only be written to ‘1’. Only Reset clears it to ‘0’.

Writing a ‘1’ to this bit protects the application data section from further writes.

This bit can only be written to ‘1’. Only Reset clears it to ‘0’.

Writing a ‘1’ to this bit protects the BOOT section from a read and instruction fetch. If issuing a read from the application section, it will return ‘0’. An instruction fetch from the BOOT section returns an NOP instruction.

This bit can only be written to ‘1’ from the BOOT section. Only Reset clears it to ‘0’. The bit will only take effect when the BOOT section is left the first time after the bit is written.

The BOOTROW will also be locked for access from the application section.

Writing a ‘1’ to this bit protects the application code section from further writes.

This bit can only be written to ‘1’. Only Reset clears it to ‘0’.