mov th1,#0fah ;baud rate (fd=19200,fa=9600) 
mov tl1,#0fah ;TH1=TL1 = 256 - (freq / (32 * 12 * BAUD)) 
mov pcon,#00h 
mov scon,#50h ;8-bit UART mode1 (Serial Mode 1 Set by Timer 1)