LM3S5652 Luminary Micro, Inc, LM3S5652 Datasheet - Page 121
LM3S5652
Manufacturer Part Number
LM3S5652
Description
Lm3s5652 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S5652.pdf
(703 pages)
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Reset
Reset
Type
Type
Sleep Mode Clock Gating Control Register 2 (SCGC2)
Base 0x400F.E000
Offset 0x118
Type R/W, reset 0x00000000
June 02, 2008
Bit/Field
31:17
15:14
12:5
16
13
RO
RO
4
31
15
0
0
reserved
RO
RO
Register 30: Sleep Mode Clock Gating Control Register 2 (SCGC2), offset
0x118
This register controls the clock gating logic. Each bit controls a clock enable for a given interface,
function, or unit. If set, the unit receives a clock and functions. Otherwise, the unit is unclocked and
disabled (saving power). If the unit is unclocked, reads or writes to the unit will generate a bus fault.
The reset state of these bits is 0 (unclocked) unless otherwise noted, so that all functional units are
disabled. It is the responsibility of software to enable the ports necessary for the application. Note
that these registers may contain more bits than there are interfaces, functions, or units to control.
This is to assure reasonable code compatibility with other family and future parts. RCGC2 is the
clock configuration register for running operation, SCGC2 for Sleep operation, and DCGC2 for
Deep-Sleep operation. Setting the ACG bit in the Run-Mode Clock Configuration (RCC) register
specifies that the system uses sleep modes.
30
14
0
0
UDMA
R/W
RO
29
13
reserved
reserved
reserved
0
0
GPIOE
UDMA
Name
USB0
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
R/W
R/W
R/W
RO
RO
RO
RO
RO
26
10
0
0
RO
RO
Reset
25
0
9
0
reserved
0
0
0
0
0
0
reserved
Preliminary
RO
RO
24
0
8
0
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.
USB0 Clock Gating Control. This bit controls the clock gating for Port
H. If set, the unit receives a clock and functions. Otherwise, the unit is
unclocked and disabled. If the unit is unclocked, reads or writes to the
unit will generate a bus fault.
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.
UDMA Clock Gating Control. This bit controls the clock gating for Port
H. If set, the unit receives a clock and functions. Otherwise, the unit is
unclocked and disabled. If the unit is unclocked, reads or writes to the
unit will generate a bus fault.
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.
Port E Clock Gating Control. This bit controls the clock gating for Port
E. If set, the unit receives a clock and functions. Otherwise, the unit is
unclocked and disabled. If the unit is unclocked, reads or writes to the
unit will generate a bus fault.
RO
RO
23
0
7
0
RO
RO
22
0
6
0
RO
RO
21
0
5
0
GPIOE
R/W
RO
20
0
4
0
GPIOD
R/W
RO
19
0
3
0
LM3S5652 Microcontroller
GPIOC
R/W
RO
18
0
2
0
GPIOB
R/W
RO
17
0
1
0
GPIOA
USB0
R/W
R/W
16
0
0
0
121
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