•Mode 2: Serial port operates as a 9-bit UART with a fixed baud rate. 11-bits are transmitted or received. Start bit (always 0), 8 data bits (LSB first), a programmable 9th bit, and a stop bit (always 1).
•On transmission, the 9thbit whatever has been put in TB8 in SCON (may be a parity bit).
•On reception, the 9thbit is placed in RB8 in SCON.
•Baud Rate is
programmable to either 1/32 or 1/64 of the
on-chip oscillator frequency.