Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X 데이터 시트
제품 코드
DK-TM4C129X
Register 3: QSSI Data (SSIDR), offset 0x008
Important: This register is read-sensitive. See the register description for details.
The SSIDR register is 16-bits wide. When the SSIDR register is read, the entry in the receive FIFO
that is pointed to by the current FIFO read pointer is accessed. When a data value is removed by
the QSSI receive logic from the incoming data frame, it is placed into the entry in the receive FIFO
pointed to by the current FIFO write pointer.
that is pointed to by the current FIFO read pointer is accessed. When a data value is removed by
the QSSI receive logic from the incoming data frame, it is placed into the entry in the receive FIFO
pointed to by the current FIFO write pointer.
When the SSIDR register is written to, the entry in the transmit FIFO that is pointed to by the write
pointer is written to. Data values are removed from the transmit FIFO one value at a time by the
transmit logic. Each data value is loaded into the transmit serial shifter, then serially shifted out onto
the
pointer is written to. Data values are removed from the transmit FIFO one value at a time by the
transmit logic. Each data value is loaded into the transmit serial shifter, then serially shifted out onto
the
SSInDAT0/SSInTX
pin at the programmed bit rate.
When a data size of less than 16 bits is selected, the user must right-justify data written to the
transmit FIFO. The transmit logic ignores the unused bits. Received data less than 16 bits is
automatically right-justified in the receive buffer.
transmit FIFO. The transmit logic ignores the unused bits. Received data less than 16 bits is
automatically right-justified in the receive buffer.
QSSI Data (SSIDR)
QSSI0 base: 0x4000.8000
QSSI1 base: 0x4000.9000
QSSI2 base: 0x4000.A000
QSSI3 base: 0x4000.B000
Offset 0x008
Type RW, reset 0x0000.0000
QSSI1 base: 0x4000.9000
QSSI2 base: 0x4000.A000
QSSI3 base: 0x4000.B000
Offset 0x008
Type RW, reset 0x0000.0000
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
reserved
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Type
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DATA
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Type
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
Description
Reset
Type
Name
Bit/Field
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x0000
RO
reserved
31:16
QSSI Receive/Transmit Data
A read operation reads the receive FIFO. A write operation writes the
transmit FIFO.
transmit FIFO.
Software must right-justify data when the QSSI is programmed for a
data size that is less than 16 bits. Unused bits at the top are ignored by
the transmit logic. The receive logic automatically right-justifies the data.
data size that is less than 16 bits. Unused bits at the top are ignored by
the transmit logic. The receive logic automatically right-justifies the data.
0x0000
RW
DATA
15:0
December 13, 2013
1398
Texas Instruments-Advance Information
Quad Synchronous Serial Interface (QSSI)