LM4F111E5QR Datasheet, PDF (367/1114 Pages) Texas Instruments – Microcontroller

Stellaris^® LM4F111E5QR Microcontroller
Register 88: Inter-Integrated Circuit Power Control (PCI2C), offset 0x920
The PCI2C register controls the power provided to the I²C modules. Clearing the bit corresponding
to one of the modules indicates to the hardware that firmware requests that the peripheral be
unpowered. When a bit in this register is set, the corresponding module's state is not retained.
Software should perform a peripheral reset using the SRI2C register if the active mode changes
and the corresponding bit in the RCGCI2C, SCGCI2C, or DCGCI2C register is a 1 or the Pn bit is
changed from a 0 to a 1. Software must re-initialize the module when re-enabled due to the loss of
state.
Note: The I²C modules do not currently have the ability to respond to the power down request.
Setting a bit in this register has no effect on power consumption. This register is provided
for future software compatibility.
Inter-Integrated Circuit Power Control (PCI2C)
Base 0x400F.E000
Offset 0x920
Type R/W, reset 0x0000.003F
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
P5
P4
P3
P2
P1
P0
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
Bit/Field
31:6
5
Name
reserved
P5
Type
RO
R/W
Reset
0
1
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.
I²C Module 5 Power Control
The value of this bit does not have meaning unless the corresponding,
active mode RCGCI2C, SCGCI2C or DCGCI2C bit is cleared.
Value Description
1
I²C module 5 is powered, but does not receive a clock. In this
case, the module is inactive.
This configuration provides the second-lowest power
consumption of the module because it consumes only leakage
current.
0
I²C module 5 is not powered and does not receive a clock. In
this case, the module's state is not retained.
This configuration provides the lowest power consumption state
of the module because it consumes no dynamic nor leakage
current.
April 25, 2012
367
Texas Instruments-Advance Information