4.5.1 Connecting the 32.768 kHz Crystal

The ATtiny817 Xplained Pro board has a 32.768 Hz crystal mounted on the kit. By default, the crystal is not connected as the TOSC pins on the device are used for UART communication to the extension headers and the EDBG CDC. To use the crystal, this connection has to be broken to get a functional crystal operation.

To connect the crystal, remove resistors R307 and R308, and place them on the footprints for R312 and R313. To locate the components, see the assembly drawing in the section above (Kit Modifications).