All Atmel 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.
| Device Name | Signature Bytes Address | ||
|---|---|---|---|
| 0x00 | 0x01 | 0x02 | |
| ATtiny212 | 0x1E | 0x91 | 0x21 |
| ATtiny412 | 0x1E | 0x92 | 0x23 |