30.5 Limitations of debugWIRE

The debugWIRE communication pin (dW) is physically located on the same pin as external Reset (RESET). An external Reset source is therefore not supported when the debugWIRE is enabled.

A programmed DWEN fuse enables some parts of the clock system to be running in all sleep modes. This will increase the power consumption while in sleep. Thus, the DWEN fuse should be disabled when debugWire is not used.