N.C.1D52D63D74RCLK5N.C.6RX7TX8CS09CS110-CS211-BAUDOUT12N.C.13XTAL114XTAL215-IOW16IOW17GND18-IOR19IOR20N.C.21-DDIS22-TXRDY23-AS24N.C.25A226A127A028-RXRDY29INT30-OP231-RTS32-DTR33-OP134RESET35N.C.36N.C.37-CTS38-DSR39-CD40-RI41VCC42D043D144D245D346D447N.C.48