LM3S1138 Luminary Micro, Inc, LM3S1138 Datasheet - Page 95
LM3S1138
Manufacturer Part Number
LM3S1138
Description
Lm3s1138 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1138.pdf
(491 pages)
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Reset
Reset
Type
Type
Run Mode Clock Gating Control Register 0 (RCGC0)
Base 0x400F.E000
Offset 0x100
Type R/W, reset 0x00000040
July 26, 2008
Bit/Field
31:17
15:10
9:8
16
RO
RO
31
15
0
0
Register 18: Run Mode Clock Gating Control Register 0 (RCGC0), offset 0x100
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. RCGC0 is the
clock configuration register for running operation, SCGC0 for Sleep operation, and DCGC0 for
Deep-Sleep operation. Setting the ACG bit in the Run-Mode Clock Configuration (RCC) register
specifies that the system uses sleep modes.
RO
RO
30
14
0
0
MAXADCSPD
reserved
reserved
RO
RO
29
13
0
0
Name
ADC
reserved
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
R/W
R/W
RO
RO
RO
RO
26
10
0
0
Reset
R/W
RO
MAXADCSPD
25
0
9
0
0
0
0
0
Preliminary
reserved
R/W
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.
ADC0 Clock Gating Control
This bit controls the clock gating for SAR ADC module 0. If set, the unit
receives a clock and functions. Otherwise, the unit is unclocked and
disabled. If the unit is unclocked, a read or write to the unit generates
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.
ADC Sample Speed
This field sets the rate at which the ADC samples data. You cannot set
the rate higher than the maximum rate. You can set the sample rate by
setting the MAXADCSPD bit as follows:
Value
0x3
0x2
0x1
0x0
reserved
RO
RO
23
Description
1M samples/second
500K samples/second
250K samples/second
125K samples/second
0
7
0
R/W
HIB
RO
22
0
6
0
RO
RO
21
0
5
0
reserved
RO
RO
20
0
4
0
LM3S1138 Microcontroller
WDT
R/W
RO
19
0
3
0
RO
RO
18
0
2
0
reserved
RO
RO
17
0
1
0
ADC
R/W
RO
16
0
0
0
95
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