LM3S328-IRN20-A0T Luminary Micro, Inc., LM3S328-IRN20-A0T Datasheet - Page 283

• Manufacturer Part Number: LM3S328-IRN20-A0T
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

April 27, 2007
Reset
Reset
Type
Type
Bit/Field
31:16
15:8
SSI Control 0 (SSICR0)
Offset 0x000
7
6
R/W
RO
31
15
0
0
Register 1: SSI Control 0 (SSICR0), offset 0x000
SSICR0 is control register 0 and contains bit fields that control various functions within the SSI
module. Functionality such as protocol mode, clock rate and data size are configured in this
register.
R/W
RO
30
14
0
0
reserved
Name
SCR
SPH
SPO
R/W
RO
29
13
0
0
R/W
RO
28
12
0
0
SCR
Type
R/W
R/W
R/W
RO
R/W
RO
27
11
0
0
R/W
RO
26
10
0
0
Reset
0
0
0
0
R/W
RO
25
0
9
0
Preliminary
Description
Reserved bits return an indeterminate value, and should never
be changed.
SSI Serial Clock Rate
The value SCR is used to generate the transmit and receive bit
rate of the SSI. The bit rate is:
BR= F
where CPSDVSR is an even value from 2-254 programmed in the
SSICPSR register, and SCR is a value from 0-255.
SSI Serial Clock Phase
This bit is only applicable to the Freescale SPI Format.
The SPH control bit selects the clock edge that captures data
and allows it to change state. It has the most impact on the first
bit transmitted by either allowing or not allowing a clock
transition before the first data capture edge.
When the SPH bit is 0, data is captured on the first clock edge
transition. If SPH is 1, data is captured on the second clock edge
transition.
SSI Serial Clock Polarity
This bit is only applicable to the Freescale SPI Format.
When the SPO bit is 0, it produces a steady state Low value on
the SSICLK pin. If SPO is 1, a steady state High value is placed
on the SSICLK pin when data is not being transferred.
R/W
RO
24
0
8
0
reserved
SSICLK
SPH
R/W
RO
23
0
7
0
/(CPSDVSR * (1 + SCR))
SPO
R/W
RO
22
0
6
0
R/W
RO
21
0
5
0
FRF
R/W
RO
20
0
4
0
R/W
RO
19
0
3
0
LM3S328 Data Sheet
R/W
RO
18
0
2
0
DSS
R/W
RO
17
0
1
0
R/W
RO
16
0
0
0
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