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HardwareAllTheThings/docs/debug-interfaces/swd.md

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SWD

Summary

  • SWD Pins

SWD pins

  • SWCLK: Clock into the core
  • SWDIO: Data in / out

JTAG and SWD are similar and can be interfaced with each other:

JTAG Mode SWD Mode Signal
TCK SWCLK Clock into the core
TDI - JTAG test data input
TDO SWV JTAG Test data output / SWV trace data output
TMS SWDIO JTAG test mode select / SWD data in and out
GND GND -

References