TXD1DTR#2RTS#3VCCIO4RXD5RI#6GND7NC8DSR#9DCD#10CTS#11CBUS412CBUS213CBUS314USBDP15USBDM163V3OUT17GND18RESET#19VCC20GND21CBUS122CBUS023NC24AGND25TEST26OSCI27OSCO28