What am I still able to download the program into MCU even through I haven't enable the JTAG/SWO

[yang2]

Dear All,

I am evaluating the Nucleo Board H563ZI now.

I notice a very curious pheonmeon. In CubeMX, I didn't configure any SWO or JTAG pins, they are all disabled. However, when I generate the project, I am still able to download the program into MCU by ST LINK on the board ( USB Type-C) and go into debug mode.

Why is that?

Disable all SWO/JTAG function

Download and go into deubg mode  Successfully

[AScha.3 · Accepted solution]

Hi,

its not a curious pheonmeon .

YOU didnt configure SWD - but the chip has a default on power up , setting some pins to a default mode.

So SWD enabled at start...

see ds, pin default settings !

like this:  (note...function after reset ! )

[yang2]

AScha.3

Thank you for your response, it solved my confusion. I really appreciate it.