LM3S101-CRN20-XNPP ETC1 [List of Unclassifed Manufacturers], LM3S101-CRN20-XNPP Datasheet - Page 77

• Manufacturer Part Number: LM3S101-CRN20-XNPP
• Description: Microcontroller
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

System Control
77
Reset
Reset
Type
Type
Run-Mode, Sleep-Mode, and Deep-Sleep-Mode Clock Gating Control 2 (RCGC2, SCGC2, and DCGC2)
Offset 0x108, 0x118, and 0x128
RO
RO
31
15
0
0
Register 25: Run-Mode Clock Gating Control 2 (RCGC2), offset 0x108
Register 26: Sleep-Mode Clock Gating Control 2 (SCGC2), offset 0x118
Register 27: Deep-Sleep-Mode Clock Gating Control 2 (DCGC2), offset 0x128
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). 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 (see page 70) specifies that the system uses sleep modes.
The bit diagram for these three registers is shown below. Bits have the same definitions as DC4
(see page 59) and use DC4 as the mask.
RO
RO
30
14
0
0
RO
RO
29
13
0
0
RO
RO
28
12
0
0
RO
RO
27
11
0
0
RO
RO
26
10
0
0
reserved
RO
RO
25
0
9
0
Preliminary
RO
RO
24
0
8
0
reserved
RO
RO
23
0
7
0
RO
RO
22
0
6
0
RO
RO
21
0
5
0
RO
RO
20
0
4
0
RO
RO
19
0
3
0
PORTC PORTB PORTA
R/W
RO
18
0
2
0
March 22, 2006
R/W
RO
17
0
1
0
R/W
RO
16
0
0
0