LM3S1621 Datasheet, PDF (639/947 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S1621 Microcontroller
Register 13: ADC Control (ADCCTL), offset 0x038
This register configures the voltage reference. The voltage reference for the conversion can be the
internal 3.0-V reference or an external voltage reference in the range of 2.4 V to 3.06 V.
ADC Control (ADCCTL)
ADC0 base: 0x4003.8000
Offset 0x038
Type R/W, reset 0x0000.0000
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
VREF
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:1
0
Name
reserved
VREF
Type
Reset Description
RO 0x0000.000 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.
R/W
0
Voltage Reference Select
Value Description
1 The external VREFA input is the voltage reference.
0 The internal reference as the voltage reference.
January 21, 2012
639
Texas Instruments-Production Data