3.3.3 Data EEPROM Code Protection
The CPD Configuration bit controls the code protection for the
Data EEPROM. When enabled, external reads and writes are inhibited, and a read will
return all ‘0’s. In addition, further programming is disabled until a
Bulk Erase operation is performed on the configuration memory region. The CPU can
continue to read the memory, regardless of the protection bit settings. Self-writing the
program memory is dependent upon the write protection setting.
Important: The only way to
disable PFM or Data EEPROM code protection is to use the Bulk Erase command with the bit
associated with configuration memory in the payload set to ‘
1’. This
will disable code protection and also erase all the memory locations.