The device supports ETM and ITM trace.
Trace data from the ETM and ITM is sent to an external debugger through a 4-bit wide parallel trace port (TPIU), as illustrated in Access port unlocking.
In addition to parallel trace mode, the TPIU supports serial trace mode through the serial wire output (SWO) trace protocol. Parallel and serial trace modes cannot be used at the same time. ETM trace is only supported in parallel trace mode. ITM trace is supported in both parallel and serial trace mode. See the debug documentation of the IDE for more information.
TPIU trace pins are multiplexed with GPIO pins. The SWO and TRACEDATA[0] pins can use the same GPIO. The SWO pin can also use a separate GPIO on P2. See Pin assignments for more information.
Trace speed is configured in the register TRACEPORTSPEED. Trace pin speed is determined by the GPIO drive setting of the multiplexed pins. See GPIO — General purpose input/output for information on drive settings.