I am trying to set up a STM32F072R8T6 stm micro electronics programming port. I currently program them through the st link on the pcb. However I want to do a custom PCB and can not understand which pin goes to the proper pin on the STM32F072R8T6. I assume I can use the four pin. The sheet the describes this pin out for the STlink V2 does not tell me which pin goes where. I also it does not have a return to the processor implying I can not use Teraterm to talk to the board during debugging. I have not laided out a STmicro board in a while and what to be sure I don't have to do alot of respins.

 

You only need 4 pins to connect to STLink SWD.

1 - VDD_Target
2 - SWCLK
3 - GND
4 - SWDIO

On the MCU
SWCLK shares the same pin with PA14.
SWDIO shares the same pin with PA13.

 

Are there any PULL UP or PUll Down Required for this bus to operate

 

Are there any PULL UP or PUll Down Required for this bus to operate

No.