We are using STM32F091RCH7 microcontroller in our design and STLINK-V3SET programmer. A 14 pin JTAG connector is used. Pins 13 and 14, which are T_VCP_RX and T_VCP_TX have been left unconnected. Is it good to go?

JTAG pins are mapped as shown in the attachment. Please review and provide your comments.

This topic has been closed for replies.

Super User

You can leave T_VCP_RX and T_VCP_TX disconnected. They are not needed.

Not sure if JTDI is needed for JTAG or not.

Graduate II

Pretty sure none of the CM0 devices support JTAG, and definitely not the TDO/SWO (PB3) pin

Providing access to the VCP on CM0 might be advisable. Can always mix an inbound UART with a diode AND circuit, signal is idle high

Sign up