80C186EC/80C188EC Microprocessor User's Manual

SERIAL COMMUNICATIONS UNIT
11.2 PROGRAMMING
This section describes how to program the serial port using the appropriate registers. The Serial
Receive Buffer Register (SxRBUF) is shown in Figure 11-8 and the Serial Transmit Buffer Register
(SxTBUF) is shown in Figure 11-9. These registers have the same functions in any serial
port mode.
Register Name:
Register Mnemonic:
Register Function:
Serial Receive Buffer Register
SxRBUF
Received data bytes are stored in SxRBUF.
15 0
R
B
7
R
B
6
R
B
5
R
B
4
R
B
3
R
B
2
R
B
1
R
B
0
A1290-0A
Bit
Mnemonic
Bit Name
Reset
State
Function
RB7:0
NOTE:
Received
Data
0 Received data byte.
Reserved register bits are shown with gray shading. Reserved bits must be written
to a logic zero to ensure compatibility with future Intel products.
Figure 11-8. Serial Receive Buffer Register (SxRBUF)
11-9