If you have an I-jet Trace or J-Trace debug probe for Cortex-M3, you can use ETM trace and ITM trace concurrently.

In this case, if you activate the ETM trace and the ITM trace, ITM trace data will also be collected in the ETM trace buffer, instead of being streamed via the SWO channel. This means that the ITM trace data will not be displayed until the execution has stopped, instead of being continuously updated live in the ITM Trace window.