c8051t623-g Silicon Laboratories, c8051t623-g Datasheet - Page 179

• Manufacturer Part Number: c8051t623-g
• Description: Full Speed Usb Eprom Mcu Family
• Manufacturer: Silicon Laboratories

C8051T622/3 and C8051T326/7
SFR Definition 21.3. SBUF1: UART1 Data Buffer
SFR Address = 0xD3
186
Name
Reset
7:0 SBUF1[7:0] Serial Data Buffer Bits.
Bit
Type
Bit
Name
7
0
This SFR is used to both send
data from the UART and to
read received data from the
UART1 receive FIFO.
6
0
Description
5
0
Rev. 1.1
4
0
SBUF1[7:0]
Writing a byte to SBUF1
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.
R/W
Write
3
0
2
0
Reading SBUF1 retrieves
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.
1
0
Read
0
0