3.6 Signature Bytes

All Atmel microcontrollers have a 3-byte signature code which identifies the device. This code can be read in both serial and parallel mode, also when the device is locked. The three bytes reside in a separate address space. For the device signature bytes, there are differences between ATmega328PB and ATmega328 variants, see below table for more detail.

Table 3-5. Device Signature Bytes differences
PartSignature bytes address
0x0000x0010x002
ATmega3280x1E0x950x14
ATmega328P0x1E0x950x0F
ATmega328PB0x1E0x950x16