D31D42D53D64D75GND6RXA7RIA#8CDA#9DSRA#10CTSA#11DTRA#12VCC13RTSA#14INTA15CSA#16TXA17IOW#18TXB19CSB#20INTB21RTSB#22GND23DTRB#24CTSB#25DSRB#26CDB#27RIB#28RXB29CLKSEL30NC31A232A133A034XTAL135XTAL236RESET37RXRDY#38TXRDY#39GND40RXC41RIC#42CDC#43DSRC#44CTSC#45DTRC#46VCC47RTSC#48INTC49CSC#50TXC51IOR#52TXD53CSD#54INTD55RTSD#56GND57DTRD#58CTSD#59DSRD#60CDD#61RID#62RXD63VCC64INTSEL65D066D167D268