3.1.1 Xplained Mini Clock Output

The mEDBG outputs its CPU clock on a pin.

The clock output can be used to feed the target device with a more accurate clock if this is needed for the application. By default, this clock is disconnected from the target by a not mounted resistor.

To connect the external clock to the ATtiny817, a 0Ω resistor or strap has to be soldered in the footprint, as shown in the figure below (R205).
Figure 3-1. External Clock Footprint

The mEDBG CPU clock frequency depends on the selected voltage, see the table below.

Table 3-2. CPU Clock vs. Voltage
Target VoltagemEDBG CPU Clock
3.3V8 MHz
5.0V16 MHz