SERINIT: ;Initialize serial port
         CLR TR1
         CLR TI
         CLR RI

         MOV SCON,#01011010B ;TI SET INDICATES TRANSMITTER READY.
                             ;MODE 1 REN

         MOV TMOD,#00100001B ;TIMER 1 MODE 8 BIT AUTO RELOAD
         MOV TH1,#0FDH       ;TIMER RELOAD VALUE
         SETB TR1            ;START TIMER