Showing results for 
Search instead for 
Did you mean: 

J-Link and NUCLEO-U5A5ZJ-Q or STM32U5A9J-DK

Associate II

Does these boards work out of the box with an external debugger like a J-Link Ultra+?  I see they both support a MIPI10 connector (and one supports a tag connector as well) that leads me to believe it supports an external debugger.  However, I can't find any information about connecting these newer boards including jumper configuration changes.  The newer boards with ST-LINK/V3 don't support flashing to JLink-OB.


I'm primarily interested in more break points and trying to use advanced features of that debugger.


Check the schematics, under the CAD Resources tab. If you understand the circuit, and the connections or solder bridges it might be come more apparent which pins and connections will be contented for use. The list is going to be pretty short.

The number of break-points the hardware facilitates is fixed. Modifying flash on-the-fly has it's own issues.

You can use as many BKPT# as you want. Variable levels of telemetry can tell you a lot about flow dynamics and interactions, in real-time systems this is frequently more desirable than dead-stopping a system, or introducing 100's milliseconds of non-responsiveness.

I'd like to see Segger offer an OB firmware for the the V3, V3SE implementations, and be willing to pay reasonable money for it.

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..
Chief II

for U5 nucleo144  board, see user manual:



If you feel a post has answered your question, please click "Accept as Solution".