VND1VPD2DCD#3DSR#4CTS#5RTS#6USR117USR108RESET9VPA10TXAN11TXAP12VREF13VBG14RXA15VNA16VND17OSCOUT18OSCIN19VPD20NC21VND22TXD23TXCLK24VPD25RXD26RXCLK27DTR#28USR2029RING#30RELAY#31RI#32EP33