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// Test and Measurement Connectors

SWD 2-Pin ARM Cortex

SWD (Serial Wire Debug, ARM CoreSight) uses just 2 signals (SWDIO and SWCLK) plus power and ground for debugging and programming ARM Cortex processors, offering an alternative to 4-wire JTAG in space-constrained designs.

// Specifications
Standard
ARM CoreSight SWD
Signals
SWDIO and SWCLK (2 wires)
Speed
Up to 10 MHz SWCLK
Connector
10-pin 1.27mm or 0.05 inch Cortex
Use Case
ARM Cortex M0 M3 M4 M7 programming and debug
Tools
Segger J-Link ST-Link CMSIS-DAP
// Pin Reference Table
Pin Name Function Type
1 VCC Target 3.3V supply PWR
2 SWDIO Serial wire data input output BUS
3 SWCLK Serial wire clock BUS
4 SWO Serial wire trace output optional BUS
5 nRESET Target reset optional I/O
6 GND Ground GND