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April 13, 2026
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Debug modes

  • April 13, 2026
  • 1 reply
  • 129 views

I noticed that STM32CubeMX2 (DEBUG features page) offers only three debug modes: JTAG 4‑pin, JTAG 5‑pin, and Single Wire Trace Asynchronous.
In many practical cases, developers use only the SWCLK and SWDIO lines to save pins, so the absence of a simple Serial Wire option (without Trace) seems to be a limitation of the current STM32CubeMX2 release.
This option is still available in STM32CubeMX1 when working with similar MCUs, such as the STM32H5 series.
Is this understanding correct?

Best answer by STackPointer64

Hello @dbessone, and Welcome to ST Community!

This issue has already been reported internally under ticket number CDM0060745, so the trace line is not pin-locked when Serial Wire is selected.

Best regards,

1 reply

STackPointer64Best answer
Technical Moderator
April 13, 2026

Hello @dbessone, and Welcome to ST Community!

This issue has already been reported internally under ticket number CDM0060745, so the trace line is not pin-locked when Serial Wire is selected.

Best regards,

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