LM3S308 Luminary Micro, Inc, LM3S308 Datasheet - Page 309

• Manufacturer Part Number: LM3S308
• Description: Lm3s308 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Reset
Type
Type
SSI Control 1 (SSICR1)
SSI0 base: 0x4000.8000
Offset 0x004
Type R/W, reset 0x0000.0000
June 04, 2008
Bit/Field
31:4
RO
RO
3
2
31
15
0
0
RO
RO
Register 2: SSI Control 1 (SSICR1), offset 0x004
SSICR1 is control register 1 and contains bit fields that control various functions within the SSI
module. Master and slave mode functionality is controlled by this register.
30
14
0
0
RO
RO
29
13
reserved
0
0
Name
SOD
MS
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
R/W
R/W
RO
RO
RO
26
10
0
0
reserved
RO
RO
Reset
25
0x00
0
9
0
0
0
Preliminary
RO
RO
24
0
8
0
reserved
Description
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.
SSI Slave Mode Output Disable
This bit is relevant only in the Slave mode (MS=1). In multiple-slave
systems, it is possible for the SSI master to broadcast a message to all
slaves in the system while ensuring that only one slave drives data onto
the serial output line. In such systems, the TXD lines from multiple slaves
could be tied together. To operate in such a system, the SOD bit can be
configured so that the SSI slave does not drive the SSITx pin.
The SOD values are defined as follows:
SSI Master/Slave Select
This bit selects Master or Slave mode and can be modified only when
SSI is disabled (SSE=0).
The MS values are defined as follows:
Value
Value
0
1
0
1
RO
RO
23
0
7
0
Description
SSI can drive SSITx output in Slave Output mode.
SSI must not drive the SSITx output in Slave mode.
Description
Device configured as a master.
Device configured as a slave.
RO
RO
22
0
6
0
RO
RO
21
0
5
0
RO
RO
20
0
4
0
SOD
R/W
RO
19
0
3
0
LM3S308 Microcontroller
R/W
RO
MS
18
0
2
0
SSE
R/W
RO
17
0
1
0
LBM
R/W
RO
16
0
0
0
309