I was observing some timer signals yesterday, earlier in the morning I had my oscilloscope on another lab workbench where I would first make some changes, reflash the board and then take it to that workbench to observe, while providing power use a switchable microusb cord connected to a usb wall connector. Like the setup shown here :
However, I was getting kinda lazy running back & forth so I thought maybe I could just have it connected to my PC so I can observe it right after flashing. So I hooked everything up, and then turned on the oscilloscope...and as soon as I pressed the power button, "zap" went my MCU, with a bit of smoke as well.
Setup shown here :
After some googling, I think it was maybe something to do with the scenario shown in this video (which is also the reference for my drawing), can anyone kindly help me figure out what the actual cause is? Though I have lots of spare boards, I still wanted to know how I can prevent this while also learn what had happened. Thanks in advance!