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SWD vs JTAG Debugging Protocols

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Background: Debuggers translate PC commands to microcontroller programming languages
Before standards, manufacturers had proprietary debugging protocols
Standards like JTAG were created to reduce learning time and costs
JTAG Features: Developed by Joint Test Action Group in late 1980s
Uses 5 pins (TDI, TDO, TCK, TMS, TRST) for testing
Supports daisy chaining topology with boundary scanning capability
Latest standard is IEEE 1149.7
SWD Features: Designed by ARM for programming and debugging
Uses only 2 pins (SWDIO, SWCLK) for testing
Supports star topology architecture
Offers special features like debug info printing
Comparison: SWD requires fewer pins and has better performance
JTAG supports both programming and production testing
Many devices support both protocols through multiplexing
SWD preferred for simple designs and debugging
JTAG recommended for complex designs and mass production