LM3S818 Luminary Micro, Inc, LM3S818 Datasheet - Page 86

• Manufacturer Part Number: LM3S818
• Description: Lm3s818 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

System Control
86
Reset
Reset
Type
Type
Bit/Field
31:25
23:19
Run-Mode, Sleep-Mode, and Deep-Sleep-Mode Clock Gating Control 1 (RCGC1, SCGC1, and DCGC1)
Offset 0x104, 0x114, and 0x124
24
18
17
16
RO
RO
31
15
0
0
Register 22: Run-Mode Clock Gating Control 1 (RCGC1), offset 0x104
Register 23: Sleep-Mode Clock Gating Control 1 (SCGC1), offset 0x114
Register 24: Deep-Sleep-Mode Clock Gating Control 1 (DCGC1), offset 0x124
These registers control 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.
RCGC1 is the clock configuration register for running operation, SCGC1 for Sleep operation, and
DCGC1 for Deep-Sleep operation. Setting the ACG bit in the Run-Mode Clock Configuration
(RCC) register (see page 78) specifies that the system uses sleep modes.
RO
RO
30
14
0
0
reserved
reserved
COMP0
GPTM2
GPTM1
GPTM0
Name
RO
RO
29
13
0
0
reserved
reserved
RO
RO
28
12
0
0
Type
R/W
R/W
R/W
R/W
RO
RO
RO
RO
27
11
0
0
RO
RO
26
10
0
0
Reset
RO
RO
25
0
9
0
0
0
0
0
0
0
Preliminary
COMP0
QEI
R/W
R/W
24
0
8
0
Description
Reserved bits return an indeterminate value, and should
never be changed.
This bit controls the clock gating for the Comparator 0
module. If set, the unit receives a clock and functions.
Otherwise, the unit is unclocked and disabled.
Reserved bits return an indeterminate value, and should
never be changed.
This bit controls the clock gating for the General Purpose
Timer 2 module. If set, the unit receives a clock and
functions. Otherwise, the unit is unclocked and disabled.
This bit controls the clock gating for the General Purpose
Timer 1 module. If set, the unit receives a clock and
functions. Otherwise, the unit is unclocked and disabled.
This bit controls the clock gating for the General Purpose
Timer 0 module. If set, the unit receives a clock and
functions. Otherwise, the unit is unclocked and disabled.
RO
RO
23
0
7
0
reserved
RO
RO
22
0
6
0
reserved
RO
RO
21
0
5
0
SSI
R/W
RO
20
0
4
0
RO
RO
19
0
3
0
reserved
GPTM2 GPTM1 GPTM0
R/W
RO
18
0
2
0
February 6, 2007
UART1 UART0
a
R/W
R/W
17
0
1
0
R/W
R/W
16
0
0
0
a
a
a