GPIOA8/TXTA1GPIOA9/RXTA2NC3NC4GND5USBD+6USBD-7VIO8VCC9VCC_REG10VBUS_SENSE11RESET#12NC13USB_STAT214USB_STAT115GPIOB9/RXTB16GPIOB8/TXTB17GPIOB7/RS485B18GPIOB6/CLKB19NC20TXB21RXB22GPIOB5/RTSB#/RS485B23VIO24GND25GPIOB4/CTSB#26GPIOB3/DTRB#27GPIOB2/DSRB#28GPIOB1/CDB#29GPIOB0/RIB#/RWKB#30GPIOA0/RIA#/RWKA#31GPIOA1/CDA#32GPIOA2/DSRA#33GPIOA3/DTRA#34GPIOA4/CTSA#35GPIOA5/RTSA#/RS485A36RXA37TXA38GPIOA6/CLKA39GPIOA7/RS485A40EP41