Sequence for Execution of Self-Programming

To execute self-programming (the execution of writes to the NVM controller’s command register), the following steps are required:

  1. 1.The software temporarily enables self-programming by writing the SPM signature to the CCP (CPU.CCP) register.
  2. 2.Within four instructions, the software must execute the appropriate instruction or change to NVM Command Register.

    The protected change is automatically disabled after the CPU executes a write instruction.