Table 7. Stdc14/Mipi10 Debug Connector (Cn5) Pinout; Figure 8. Stdc14/Mipi10 Debug Connector (Cn5) - ST STM32U5 User Manual

Figure 8 shows the STDC14/MIPI10 connector (CN5).
Table 7 describes the STDC14/MIPI10 connector (CN5) pinout.
MIPI10 pin
-
-
1
2
3
4
5
6
7
8
9
10
-
-
1. Do not connect to the target. It is not connected to the STM32U5 Nucleo-144 board.
2. Input for the external debug tools and output for the STM32U5 Nucleo-144 board.
3. Optional loopback of JTCK on the target side.
4. NC means not required for the SWD connection, not connected on the STM32U5 Nucleo-144 board.
5. Tied to GND. It might be used by the target for the detection of the tool.
6. Output for the external debug tools and input for the STM32U5 Nucleo-144 board.
Two level shifters are used on VCP and SWD interfaces to offer a debug capability with MCU powered by a 1.8 V
power source. The level Shifters are used for signals from target MCU (1.8/3.3 V) to STLINK-V3E (3.3 V).
UM2861 - Rev 5
Figure 8. STDC14/MIPI10 debug connector (CN5)
Table 7. STDC14/MIPI10 debug connector (CN5) pinout
STDC14 pin CN5
1 NC
2 NC
3 VDD
4 T_SWDIO
5 GND
6 T_SWCLK
7 GND
8 T_SWO
9 NC
10 T_JTDI
11 GNDDetect
12 T_NRST
13 T_VCP_RX
14 T_VCP_TX
Function
Reserved (1)
(1)
Reserved
(2)
Target VDD
Target SWDIO using SWD protocol or target JTMS (T_JTMS) using
JTAG protocol
Ground
Target SWCLK using SWD protocol or target JTCK (T_JTCK) using
JTAG protocol
Ground
Target SWO using SWD protocol or target JTDO (T_JTDO) using JTAG
protocol (SB44 ON)
(3) (4)
T_JRCLK /NC
Not used by SWD protocol, target JTDI (T_JTDI) using JTAG protocol,
only for external tools (SB39 OFF)
(5)
GND detect for plug indicator
Target NRST
Target RX used for VCP (with UART supporting bootloader)
Target TX used for VCP (with UART supporting bootloader)
UM2861
Embedded STLINK-V3E
(6)
(2)
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