MOV TMOD,#$20   ;DISABLE GATE
                           ;TIMER MODE
                           ;TIMER 1, MODE 2
           MOV TL1,#$FF    ;RELOAD VALUE=255
           MOV TH1,#$FF
           MOV TCON,#$50   ;BOTH TIMERS RUNNING
           MOV SCON,#$70   ;MODE 1, 8 BIT UART