NC1NC2DSRA3CTSA4DTRA5VCC6RTSA7INTA8CSA9TXA10IOW11TXB12CSB13INTB14RTSB15GND16DTRB17CTSB18DSRB19NC20NC21NC22CDB23RIB24RXB25CLKSEL26NC27A228A129A030XTAL131XTAL232RESET33RXRDY34TXRDY35GND36RXC37RIC38CDC39NC40NC41NC42DSRC43CTSC44DTRC45VCC46RTSC47INTC48CSC49TXC50IOR51TXD52CSD53INTD54RTSD55GND56DTRD57CTSD58DSRD59NC60NC61NC62CDD63RID64RXD65VCC66INTSEL67D068D169D270D371D472D573D674D775GND76RXA77RIA78CDA79NC80