The AHB Trace Macrocell (HTM) interface enables a simple connection of the AHB trace macrocell to the processor. It provides a channel for the data trace to the HTM.

Your implementation must include this interface to use the HTM interface. You must set TRCENA to 1 in the Debug Exception and Monitor Control Register (DEMCR) before you enable the HTM port to supply trace data. See the ARMv7-M Architecture Reference Manual.