JTAG/SWD接口定义

news2025/11/10 2:02:14

1. ST-Link接口定义

2. ULINK2接口定义

为方便查阅，将ST-LINK和ULINK的JTAG和SWD接口定义总结如下：

1. ST-Link接口定义

Pin no.	ST-LINK/V2 connector (CN3)	ST-LINK/V2 function	Target connection (JTAG)	Target connection (SWD)
1	VAPP	Target VCC	MCU VDD(1)	MCU VDD(1)
2	VAPP	Target VCC	MCU VDD(1)	MCU VDD(1)
3	TRST	JTAG TRST	JNTRST	GND(2)
4	GND(3)	GND(3)	GND(3)(4)	GND(3)(4)
5	TDI	JTAG TDO	JTDI	GND(2)
6	GND(3)	GND(3)	GND(3)(4)	GND(3)(4)
7	TMS_SWDIO	JTAG TMS, SW IO	JTMS	SWDIO
8	GND(3)	GND(3)	GND(3)(4)	GND(3)(4)
9	TCK_SWCLK	JTAG TCK, SW CLK	JTCK	SWCLK
10	GND(5)	GND(5)	GND(4)(5)	GND(4)(5)
11	Not connected	Not connected	Not connected	Not connected
12	GND	GND	GND(4)	GND(4)
13	TDO_SWO	JTAG TDI, SWO	JTDO	TRACESWO(6)
14	GND(5)	GND(5)	GND(4)(5)	GND(4)(5)
15	NRST	NRST	NRST	NRST
16	GND(3)	GND(3)	GND(3)(4)	GND(3)(4)
17	Not connected	Not connected	Not connected	Not connected
18	GND	GND	GND(4)	GND(4)
19	VDD(3)	VDD (3.3 V)(3)	Not connected	Not connected
20	GND	GND	GND(4)	GND(4)

1. The power supply from the application board is connected to the ST-LINK/V2 debugging and programming board to ensure signal compatibility between the boards.

2. Connect to GND for noise reduction on the ribbon.

3. Available on ST-LINK/V2 only, not connected on ST-LINK/V2-ISOL.

4. At least one of these pin must be connected to the ground for correct behavior, it is recommended to connecting all of them.

5. GND on ST-LINK/V2, used by SWIM on ST-LINK/V2-ISOL (see Table 3).

6. Optional: for Serial Wire Viewer (SWV) trace.

参考文献：um1075-stlinkv2-incircuit-debuggerprogrammer-for-stm8-and-stm32-stmicroelectronics.pdf

2. ULINK2接口定义

仿真器端口	连接目标板	备注
1. VCC	MCU电源VCC	VCC
2. VCC	MCU电源VCC	VCC
3. TRST	TRST	Test ReSeT/ pin
4. GND	GND或悬空
5. TDI	TDI	Test Data In pin
6. GND	GND或悬空
7. TMS, SWIO	TMS, SWIO	JTAG:Test Mode State pin ; SWD: Data I/O pin
8. GND	GND或悬空
9. TCLK, SWCLK	TMS, SWCLK	JTAG: Test Clock pin ; SWD: Clock pin
10. GND	GND或悬空
11. RTCK	RTCK
12. GND	GND或悬空
13. TDO	TDO	Test Data Out pin
14. GND	GND或悬空
15. RESET	RESET	RSTIN pin
16. GND	GND或悬空
17. NC	NC
18. GND	GND或悬空
19. NC	NC
20. GND	GND或悬空