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
ATtiny2120x1E0x910x21
ATtiny2140x1E0x910x20
ATtiny4120x1E0x920x23
ATtiny4140x1E0x920x22
ATtiny416 0x1E0x920x21