Debugging is a critical part in the code development for the microcontrollers. Debugging interfaces help debug the microcontroller. SWD (Serial Wire Debug) and JTAG (Joint Test Action Group) are debugging interfaces used in embedded systems, but they differ in structure, functionality, and applications. SWD is ideal for ARM-based microcontrollers where fewer pins and high-speed debugging are needed. JTAG is more versatile, supporting multiple architectures and offering boundary scanning for production testing.
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