C8051F380/1/2/3/4/5/6/7/C
SFR Definition 24.3. SBUF1: UART1 Data Buffer
Bit
7
6
5
4
3
2
1
0
Name
Type
SBUF1[7:0]
R/W
Reset
0
0
0
0
0
0
0
0
SFR Address = 0xD3; SFR Page = All Pages
Bit Name Description
Write
Read
7:0
SBUF1[7:0] Serial Data Buffer Bits.
Writing a byte to SBUF1
Reading SBUF1 retrieves
data from the UART and to
read received data from the
UART1 receive FIFO.
This SFR is used to both send initiates the transmission.
When data is written to
SBUF1, it first goes to the
Transmit Holding Register,
where it is held for serial
transmission. When the
transmit shift register is
available, data is trans-
ferred into the shift regis-
ter, and SBUF1 may be
written again.
Rev. 1.4
data from the receive
FIFO. When read, the old-
est byte in the receive
FIFO is returned, and
removed from the FIFO.
Up to three bytes may be
held in the FIFO. If there
are additional bytes avail-
able in the FIFO, the RI1
bit will remain at logic 1,
even after being cleared
by software.
247
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