6.7 Signature Bytes

All tinyAVR® microcontrollers have a 3-byte signature code that identifies the device. The three bytes reside in a separate address space. For the device, the signature bytes are given in the following table.

Note: When the device is locked, only the System Information Block (SIB) can be accessed.
Table 6-4. Device ID
Device NameSignature Bytes Address
0x000x010x02
ATtiny2020x1E0x910x23
ATtiny2040x1E0x910x22
ATtiny4020x1E0x920x27
ATtiny4040x1E0x920x26
ATtiny4060x1E0x920x25