Discussion
The register which acts as 'receive' and 'transmit' buffer in serial communication in 8051 is :
Answer: C
The register is SBUF.
SBUF (serial buffer) at SFR address 99H is really two registers at one address: writing to it loads the transmit buffer and starts transmission, and reading it returns the byte received.
SCON is the serial control register, which sets the mode and holds the TI and RI flags. PCON holds the SMOD bit that doubles the baud rate, among power control bits. The accumulator only passes data to and from SBUF; it is not the serial buffer.
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