Hi Bikashi,

Some answers:

If you implement your serial interface using interrupts, you can indeed get something done while waiting for serial I/O to complete. A polled interface makes it hard to get anything else done.

Yes, 10 bits = 1 start + 8 data + 1 stop, assuming the uart is set to mode 1 (as you have set it).

Full duplex *is* possible: there are *two* SBUF registers, one for transmit (write-only) and one for receive (read-only).

Check out the tutorials here for using the uart.

Good luck!

Dennis