Hi Rashu,

You have to set the SMOD bit in the PCON register to set the 9600 baud rate on MC site. I guess you have 4800 baud for now.

And one more thing about TX part. To prevent possible wasting MC time it is much better to set TI bit during an initialisation, then first check TI bit, and after then send byte.

txd: jnb TI,txd
mov SBUF,A ;#0x43 in your case
clr TI
ret

Just realize, it takes 1ms to send 1 byte at 9600 baud but it is 1000us and about 500 executable instructions (for 12 MHz clock) in average, too.

Regards,
George