6.1.3 STLINK-V3E firmware upgrade
The STLINK-V3E embeds a firmware upgrade mechanism for in-situ upgrades through the USB port. As the
firmware may evolve during the lifetime of the STLINK-V3E product (for example new functionalities, bug fixes,
support for new microcontroller families), it is recommended to visit the www.st.com website before starting to use
the STM32H735G-DK Discovery kit and periodically, to stay up-to-date with the latest firmware version.
6.1.4 Using an external debug tool to program and debug the on-board STM32
There are 2 basic ways to support an external debug tool:
1. Keep the embedded STLINK-V3E running. Power on the STLINK-V3E at first until the COM LED lights RED.
Then connect the external debug tool through CN7 MIPI-10 debug connector.
2. Set the embedded STLINK-V3E in a high-impedance state. When setting the jumper JP3 (STLK_RST) ON,
the embedded STLINK-V3E is in RESET state and all GPIOs are in high impedance. Then the user can
connect his external debug tool on the debug connector CN7.
Figure 9. Connecting an external debug tool to program the on-board STM32
JP3: STLK_RST
CN7: External debug tool connector
JP7: Power supply selection
CN15: ST-LINK USB connector
Table 4 describes the CN7 MIPI10 debug connector pinout.
Table 4. CN7 MIPI-10 debug connector pinout
MIPI-10 pin
STDC14 pin CN7 Designation
- 1 NC Reserved
- 2 NC Reserved
1 3 T_VCC Target VCC
2 4 T_SWDIO
Target SWDIO using SWD protocol or Target JTMS (T_JTMS) using JTAG
protocol
3 5 GND Ground
4 6 T_SWCLK
Target SWCLK using SWD protocol or Target JCLK (T_JCLK) using JTAG
protocol
5 7 GND Ground
6 8 T_SWO
Target SWO using SWD protocol or Target JTDO (T_JTMS) using JTAG
protocol
UM2679
Embedded STLINK-V3E
UM2679 - Rev 1
page 11/42
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