DS80C320-MCG Datasheet, PDF (40/175 Pages) Dallas Semiconductor – High-Speed Microcontroller User Guide

REN_1
Bit 4
TB8_1
Bit 3
RB8_1
Bit 2
TI_1
Bit 1
RI_1
Bit 0
High-Speed Microcontroller User’s Guide
Receive Enable. This bit enables/disables the serial port 1 receiver shift
register.
0 = Serial port 1 reception disabled.
1 = Serial port 1 receiver enabled (modes 1, 2, 3). Initiate synchronous reception
(mode 0).
9^th Transmission Bit State. This bit defines the state of the 9^th transmission bit
in serial port 1 modes 2 and 3.
9^th Received Bit State. This bit identifies the state for the 9^th reception bit
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^th data bit. In all other modes, this bit is set at the end of the last data
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^th bit. In serial port mode 1, RI_1 is set after the last sample of the
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 (SBUF1)
7
6
5
SFR C1h SBUF1.7 SBUF1.6 SBUF1.5
RW-0 RW-0 RW-0
4
SBUF1.4
RW-0
3
SBUF1.3
RW-0
2
SBUF1.2
RW-0
1
SBUF1.1
RW-0
0
SBUF1.0
RW-0
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
SBUF1.7-0
Bits 7-0
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.
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