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Thanks, thats what i thought, but for STM32L073 i read the datasheet and all the Eval board docs, but nowhere is it clearly stated which exact pins are needed to be brought to the programming header.

I went to the STM32L073 web page and looked through every link...absolutely nowhere does it tell exactly which pins are needed for programming or for debugging.

STM32L073CBU6 (LQFP48)

[URL unfurl="true"]https://www.st.com/en/microcontrollers-microprocessors/stm32l073cb.html[/URL]

With PIC microcontrollers you are left in no doubt whatsoever about which exact pins are needed.

As for debugging, its the same.

We have a new board coming out and i want to put prog/debug on there in case there are problems and the software guys need to look into the processor (debug it)  and reprogram it.