The DSU - Device Service Unit peripheral provides the Device Selection bits in the Device Identification register (DID.DEVSEL) in order to identify the device by software. The SAM L22 variants have a reset value of DID=0x10820xxx, with the last digits identifying the variant:
| DSU DID.DEVSEL | Device |
|---|---|
| 0x0 | L22N18 |
| 0x1 | L22N17 |
| 0x2 | L22N16 |
| 0x3-0x4 | Reserved |
| 0x5 | L22J18 |
| 0x6 | L22J17 |
| 0x7 | L22J16 |
| 0x8-0x9 | Reserved |
| 0xA | L22G18 |
| 0xB | L22G17 |
| 0xC | L22G16 |
| 0xD-0xFF | Reserved |