Nano V3 ch340 connection to cpu

[picclock]

 The Nano V3 incorporates a ch340 serial to usb convertor soldered on the reverse side of the pcb.
I am trying to find which pins the cpu uses to connect to it, and whether they are accessible via arduino IDE.

Many thx for your interest.

Best Regards

picclock

[westfw]

Bits D0 (30) (AVR RXD) and D1 (31) (TXD) are accessible as Arduino pins 0 and 1, and of course by Serial.xxx()
Also, there's a cap between DTR and the AVR RESET, and that's normally NOT usable.

[picclock]

@ westfw

I cannot find any connection between pins 2-3 on the ch340, and the 328p.

I suppose my real question is more subtle than the one I asked. I want to use two interrupt routines but I don't want it to screw up the usb connection.

So I really need a way to test if usb communication is busy, and disable it if not, or wait until it becomes not busy.

Hope this makes some sort of sense.

Best Regards

picclock

[DLJ]

They say "A picture is worth a thousand words" so here is a picture showing the connections between the 328P and the CH340.
Good luck.

[picclock]

@ DLJ
Thank you very much.

Best Regards

picclock