... , 1MBytes SRAM, 2Mbytes flash memory, voltage regulator, 2 channels DB-9 serial port connector, 1 USB connector, switches and LED which is ... so onKey feature:Loading codes easily through bootstrap and serial port “0”(DB-9, J3) ,or USB port(J25)2 connectors(DB ... -9, RS-232) , 1 USB connector4 serial interface (2 internal + 2 URAT)Voltage regulatorInterface used ...