The mEDBG outputs its CPU clock on a pin. This clock pin is connected to the ATmega328P clock input and is used to have a synchronous clock with the mEDBG to enable debugging through debugWIRE.
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 |