SparkFun Electronics Forum

I am working with an ATmega328. What I want to do is finding a way to save any value in any GPR of the microcontroller using the PC.

I found this video where an already made interface is shown. Apparently, that is very user-friendly. But does it what I'm trying to achieve? For example, if I want to save the value 0x3B in register R16, could I use that software to do it via USB?

Also, I don't know how to connect the USB with the microcontroller pins. I've found this image

but I would have expected the pins TXD and RXD to be used. Is this connection alright?

Sorry if the question is a bit messy, I'm a beginner with this stuff. If you need any further information please let me know.

The micro is undoubtedly running VUSB firmware, which is open source. You will have to modify the basic software interface to do what you want.
https://www.obdev.at/products/vusb/index.html