13.10 Program and Debug Interface Disable (PDID)
After activating the Program and Debug Interface Disable (PDID), the only way to write to the reprogrammable Flash memory (non-volatile memory (NVM)) is from the code executing on the device. Chip erase or other re-programming attempts through the debug port will fail. Also, any attempt to read out any device content (NVM, RAM, and so on) will fail. Contact a local Microchip sales office for additional information about PDID functionality.