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CH340 connect to ESP8266 (upload sketch) OFF OFF OFF OFF ON ON ON NoUSE
CH340 connect to ESP8266 (connect) OFF OFF OFF OFF ON ON OFF NoUSE
CH340 connect to ATmega2560 (upload sketch) OFF OFF ON ON OFF OFF OFF NoUSE
CH340 connect to ATMega2560 COM to ESP8266 ON ON ON ON OFF OFF OFF NoUSE
ATMega2560 + ESP8266 ON ON OFF OFF OFF OFF OFF NoUSE
All modules work independent OFF OFF OFF OFF OFF OFF OFF NoUSE
https://robotdyn.com/mega-wifi-r3-atmega2560-esp8266-flash-32mb-usb-ttl-ch340g-micro-usb.html