DS80C320-ECD DALLAS [Dallas Semiconductor], DS80C320-ECD Datasheet - Page 40

• Manufacturer Part Number: DS80C320-ECD
• Description: High-Speed Microcontroller User Guide
• Manufacturer: DALLAS [Dallas Semiconductor]

Serial Data Buffer 1 (SBUF1)
REN_1
Bit 4
TB8_1
Bit 3
RB8_1
Bit 2
TI_1
Bit 1
RI_1
Bit 0
SFR C1h SBUF1.7
SBUF1.7-0
Bits 7-0
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
RW-0
7
SBUF1.6
Receive Enable.
register.
0 = Serial port 1 reception disabled.
1 = Serial port 1 receiver enabled (modes 1, 2, 3). Initiate synchronous reception
(mode 0).
9
in serial port 1 modes 2 and 3.
9
received data in serial pot 1 modes 2 and 3. In serial port mode 1, when
SM2_1=0, RB8_1 is the state of the stop bit. RB8_1 is not used in mode 0.
Transmitter Interrupt Flag. This bit indicates that data in the serial port 1
buffer has been completely shifted out. In serial port mode 0, TI_1 is set at the
end of the 8
bit. This bit must be manually cleared by software.
Transmitter Interrupt Flag. This bit indicates that a byte of data has been
received in the serial port 1 buffer. In serial port mode 1, RI_1 is set at the end
of the 8
incoming stop bit subject to the state of SM2_1. In modes 2 and 3, RI_1 is set
after the last sample of RB8_1. This bit must be manually cleared by software.
Serial Data Buffer 1. Data for serial port 1 is read from or written to this
location. The serial transmit and receive buffers are separate registers, but both
are addressed at this location.
th
th
RW-0
Transmission Bit State. This bit defines the state of the 9
Received Bit State. This bit identifies the state for the 9
6
th
bit. In serial port mode 1, RI_1 is set after the last sample of the
SBUF1.5
th
RW-0
data bit. In all other modes, this bit is set at the end of the last data
5
This bit enables/disables the serial port 1 receiver shift
SBUF1.4
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RW-0
4
SBUF1.3
RW-0
3
High-Speed Microcontroller User’s Guide
SBUF1.2
RW-0
2
SBUF1.1 SBUF1.0
RW-0
th
1
transmission bit
th
reception bit
RW-0
0