LM3S101-CRN20-XNPP ETC1 [List of Unclassifed Manufacturers], LM3S101-CRN20-XNPP Datasheet - Page 232
![no-image](/images/no-image-200.jpg)
LM3S101-CRN20-XNPP
Manufacturer Part Number
LM3S101-CRN20-XNPP
Description
Microcontroller
Manufacturer
ETC1 [List of Unclassifed Manufacturers]
Datasheet
1.LM3S101-CRN20-XNPP.pdf
(284 pages)
- Current page: 232 of 284
- Download datasheet (3Mb)
March 22, 2006
Reset
Reset
Type
Type
SSI Data (SSIDR)
Offset 0x008
Bit/Field
R/W
RO
31:16
31
15
0
0
15:0
Register 3: SSI Data (SSIDR), offset 0x008
SSIDR is the data register and is 16-bits wide. When SSIDR is read, the entry in the receive FIFO
(pointed to by the current FIFO read pointer) is accessed. As data values are removed by the SSI
receive logic from the incoming data frame, they are placed into the entry in the receive FIFO
(pointed to by the current FIFO write pointer).
When SSIDR is written to, the entry in the transmit FIFO (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. It is
loaded into the transmit serial shifter, then serially shifted out onto the SSITx 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.
When the SSI is programmed for National Semiconductor MICROWIRE frame format, the default
size for transmit data is eight bits (the most significant byte is ignored). The receive data size is
controlled by the programmer. The transmit FIFO and the receive FIFO are not cleared even when
the SSE bit in the SSICR1 register is set to zero. This allows the software to fill the transmit FIFO
before enabling the SSI.
R/W
RO
30
14
0
0
reserved
Name
DATA
R/W
RO
29
13
0
0
R/W
RO
28
12
0
0
R/W
Type
RO
R/W
27
11
0
0
RO
R/W
RO
26
10
0
0
Reset
R/W
RO
25
0
0
0
9
0
Preliminary
R/W
RO
24
0
8
0
Description
Reserved bits return an indeterminate value, and should
never be changed.
SSI Receive/Transmit Data
A read operation reads the receive FIFO. A write operation
writes the transmit FIFO.
Software must right-justify data when the SSI 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.
reserved
DATA
R/W
RO
23
0
7
0
R/W
RO
22
0
6
0
R/W
RO
21
0
5
0
R/W
RO
20
0
4
0
R/W
RO
19
0
3
0
LM3S101 Data Sheet
R/W
RO
18
0
2
0
R/W
RO
17
0
1
0
R/W
RO
16
0
0
0
232
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