All microcontrollers have a three-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 the signature bytes are given in the following table.
| Part | Signature Bytes Address | JTAG | |||
|---|---|---|---|---|---|
| 0x000 | 0x001 | 0x002 | Part number | Manufacture ID | |
| ATmega324PB | 0x1E | 0x95 | 0x17 | 9511 | 0x1F |