The readout protection can be set by writing 0xAA in the ROP option byte. It can be disabled
by reprogramming the ROP option byte. Enabling and disabling readout protection is
possible only in ICP mode.
When the readout protection is selected, reading or modifying the Flash program memory in
ICP mode (using the SWIM interface) is forbidden. When available, the data EEPROM
memory is also protected against read and write access through ICP.
Erasing the ROP option byte to disable the readout protection causes the Flash program
memory, the DATA area and the option bytes to be erased.