2.2 Device/Revision ID

The 16-bit Device ID Word is located at the address 3F FFFEh and the 16-bit Revision ID is located at the address 3F FFFCh. These locations are read-only and cannot be erased or modified. See the Device ID and Revision ID registers for more details.

If the ICSP interface has been disabled by setting the ICSPDIS configuration bit, the Device ID and Revision ID can still be read using the dedicated ICSP commands documented in Table 3-1. These commands will only return the Device ID and Revision ID if the ICSP and Debugging interfaces are locked, otherwise these commands will always return a constant value 0xA5A5.