The Debug in connector (P18) makes it possible to connect external debuggers for debugging when the interface MCU USB cable is not connected or the Preview Development Kit (PDK) is in nRF only mode.
For trace, a footprint for a 20-pin connector is available (P25). If trace functionality is required, it is possible to mount a 2×10 pin 1.27 mm pitch surface-mount pin header.
GPIO | Trace | Default use |
---|---|---|
P0.12 | TRACECLK | |
P0.11 | TRACEDATA[0] | |
P0.10 | TRACEDATA[1] | |
P0.09 | TRACEDATA[2] | Button 4 |
P0.08 | TRACEDATA[3] | Button 3 |
The reference voltage for the debug input and trace is by default connected to VDD_nRF'. This can be connected to the VDD by cutting SB60 and soldering SB59.