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 1. External Clock
Footprint
The mEDBG CPU clock frequency depends on the selected voltage, see the table below.
| Target Voltage | mEDBG CPU Clock |
|---|---|
| 3.3V | 8 MHz |
| 5.0V | 16 MHz |