9.5.7 Configuration Change Protection (CCP)

System critical I/O register settings are protected from accidental modification. Flash self-programming (via store to NVM controller) is protected from accidental execution. This is handled globally by the Configuration Change Protection (CCP) register.

Changes to the protected I/O registers or bits, or execution of protected instructions, are only possible after the CPU writes a signature to the CCP register. The different signatures are listed in the description of the CCP register (CPU.CCP).

There are two modes of operation: one for protected I/O registers, and one for the protected self-programming.