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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 Reg-
ister (SxTBUF) is shown in Figure 11-9. These registers have the same functions in any serial
port mode.
Register Name:
Register Mnemonic:
Register Function:
15
Bit
Mnemonic
RB7:0
Received
Data
NOTE: 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)
Serial Receive Buffer Register
SxRBUF
Received data bytes are stored in SxRBUF.
Reset
Bit Name
State
0
SERIAL COMMUNICATIONS UNIT
R
R
R
R
B
B
B
B
7
6
5
4
Function
Received data byte.
0
R
R
R
R
B
B
B
B
3
2
1
0
A1290-0A
11-9
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