The ATmega324PB Xplained Pro has a CryptoAuthentication™ Device (ATECC508A) connected to the I2C buss.
More information about ATECC508A can be found at http://www.atmel.com/devices/ATECC508A.aspx.
| ATmega324PB pin | ATECC508A pin | Function | Shared functionality |
|---|---|---|---|
| PE5 | 5 | SDA | EXT1/EXT3/EXT4/EDBG I2C |
| PE6 | 6 | SCL | EXT1/EXT3/EXT4/EDBG I2C |