Please help me in these topics also:

a)Can it be possible for a Ucontoller to recieve data while doing other job, (e.g. controlling motor speed and recieving data at the same time) ?

b)Are there altogether 10 bits (including Start and Stop bit) in a frame while using 8 bits mode ?

c)Full duplex is not possible as there is only one SBUF.I guess.