N.C.1D52D63D74RCLK5N.C.6RX7TX8CS09CS110CS2#11BAUDOUT#12N.C.13XTAL114XTAL215IOW#16IOW17GND18IOR#19IOR20N.C.21DDIS#22TXRDY#23AS#24NC25A226A127A028RXRDY#29INT30OP2#31RTS#32DTR#33OP1#34RESET35NC36NC37CTS#38DSR#39CD#40RI#41VCC42D043D144D245D346D447NC48