STM32H7XX device security bit error

[JCHUN.2]

hi

I have a question while set Option byte using STM32 ST-LINK Utility.

I'm testing STM32H750 MCU (chip, socket EVK, ST-Link)

After I set the Security bit using ST-Link Utility, MCU can't debug anymore. (like figure1)

Is it right that setting Security bit make MCU can not debug?

And is there any method that makes Security bit 0? Thank you

[Jocelyn RICARD · Accepted solution]

Hello,

First I would suggest using STM32CubeProgrammer instead of STLink Utility.

Secondly, when activating the security bit, you cannot connect under reset any more.

So, you need to attach in hotplug, and you should be able to disable the security bit.

Best regards

Jocelyn