EP23TXD1/IIC_SDA22RXD1/IIC_SCL21LED/PB820PBT19RXD018TXD017PB10/RTSI16GND15PB16/SPI_CK14PB17_SPI/MOSI13PB14/SPI_INT12PB1311PB18/SPI_MISO10PB15/SPI_CS9VCC8PB9/CTS17PB66PA15WP4PA03NC2RST1