1.5.2.1 Data Watch Point (DWP) and Trace

The DWT unit is able to provide either focused data trace or global data trace. It has four comparators used to compare the following conditions:

Hardware watch point: generates a watch point event to the processor to invoke debug modes such as halt or debug monitor.
ETM trigger: causes the ETM to emit a trigger packet in the instruction trace stream.
PC sampler event trigger
Data address sample trigger

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