RXA1RESET#2XTAL13XTAL24VDD5I2C/SPI#6CS#/A07SI/A18SO9SCL/SCLK10SDA11VSS12VDD13IRQ#14CTSB#15RTSB#16GPIO0/DSRB#17GPIO1/DTRB#18GPIO2/CDB#19GPIO3/RIB#20VSS21TXB22RXB23GPIO4/DSRA#24GPIO5/DTRA#25GPIO6/CDA#26GPIO7/RIA#27VDD28VSS29RTSA#30CTSA#31TXA32EP33