DocID024597 Rev 3 1645/1693
RM0351 Debug support (DBG)
1678
44 Debug support (DBG)
44.1 Overview
The STM32L4x6 devices are built around a Cortex
®
-M4 core which contains hardware
extensions for advanced debugging features. The debug extensions allow the core to be
stopped either on a given instruction fetch (breakpoint) or data access (watchpoint). When
stopped, the core’s internal state and the system’s external state may be examined. Once
examination is complete, the core and the system may be restored and program execution
resumed.
The debug features are used by the debugger host when connecting to and debugging the
STM32L4x6 MCUs.
Two interfaces for debug are available:
• Serial wire
• JTAG debug port
Figure 518. Block diagram of STM32 MCU and Cortex
®
-M4-level debug support
Note: The debug features embedded in the Cortex
®
-M4 core are a subset of the ARM
®
CoreSight
Design Kit.
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