HW methods

AN4655

6/21

DocID027483 Rev 1

Figure 1. Remapping option principle

Figure 2. Multiplexing principle while using dedicated group of routing interface (RI)

During debug, an additional communication port is often needed to communicate the

application specific diagnostic information and system monitoring during real run. User can

setup virtual COM communication port at SWO pin while using specific instrumentation

trace macro-cell (ITM) and Serial Wire Viewer (SWV) interface.

The ITM is an application-driven trace source that supports printf style debugging to trace

Operating System (OS) and application events, and emits diagnostic system information via

STLink tool. The ITM module is available at some latest products and so save standard