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8XC251SA, SB, SP, SQ USER’S MANUAL
10-2
Figure 10-1. Serial Port Block Diagram
Table 10-2. Serial Port Special Function Registers
Mnemonic Description Address
SBUF Serial Buffer. Two separate registers comprise the SBUF register. Writing
to SBUF loads the transmit buffer; reading SBUF accesses the receive
buffer.
99H
SCON Serial Port Control. Selects the serial port operating mode. SCON enables
and disables the receiver, framing bit error detection, multiprocessor
communication, automatic address recognition, and the serial port interrupt
bits.
98H
SADDR Serial Address. Defines the individual address for a slave device. A8H
SADEN Serial Address Enable. Specifies the mask byte that is used to define the
given address for a slave device.
B8H
A4123-02
SBUF
(Receive)
Receive
Shift Register
SBUF
(Transmit)
Read SBUF
Write SBUF
Mode 0
Transmit
TXD
RXD
SCON
TIRI
Interrupt
Request
Serial I/O
Control
IB Bus
Load SBUF