2. Used to set SERIAL Controlling modesTIMER INTERRUPT SM0/SCON.7 = SERIAL port mode specifier SM1/SCON.6 = SERIAL port mode specifier SM2/SCON.5 = For multiprocessor communication REN/SCON.4 = Receive Enable TB8/SCON.3 = Transfer bit 8 RB8/SCON.2 = Receive bit 8 TI/SCON.1 = Transmit Interrupt RI/SCON.0 = Receive Interrupt

4. RB8= gets a copy of stop bit when 8 bit data is received(used for mode 2 & 3)

5. TI = TI flag becomes HIGH when data is transferred