Register 13: ADC Control (ADCCTL), offset 0x038
This register configures various ADC module attributes, including the ADC resolution and the voltage
reference. The resolution of the ADC defaults to 10-bit for backwards compatibility with other members
of the Stellaris family, but can be configured to 12-bit resolution. The voltage reference for the
conversion can be the internal 3.0-V reference, an external voltage reference in the range of 2.4 V
to 3.06 V, or an external voltage reference in the range of 0.8 V to 1.02 V.
ADC Control (ADCCTL)
ADC0 base: 0x4003.8000
ADC1 base: 0x4003.9000
Offset 0x038
Type R/W, reset 0x0000.0000
16171819202122232425262728293031
reserved
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
0123456789101112131415
VREFreservedRESreserved
R/WR/WROROR/WROROROROROROROROROROROType
0000000000000000Reset
DescriptionResetTypeNameBit/Field
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.
0x0000.000ROreserved31:5
Sample Resolution
DescriptionValue
The ADC returns 12-bit data to the FIFOs.1
The ADC returns 10-bit data to the FIFOs.0
0R/WRES4
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.
0x0ROreserved3:2
Voltage Reference Select
DescriptionValue
Internal Reference
The internal reference as the voltage reference. The conversion
range is from 0 V to 3.0 V.
0x0
3.0 V External Reference
A 3.0 V external VREFA input is the voltage reference. The ADC
conversion range is 0.0 V to the voltage of the VREFA input.
0x1
Reserved0x2
1.0 V External Reference
A 1.0 V external VREFA input is the voltage reference. The ADC
conversion range is 0.0 V to three times the voltage of the
VREFA input.
0x3
0x0R/WVREF1:0
581July 24, 2012
Texas Instruments-Production Data
Stellaris
®
LM3S6G65 Microcontroller
OBSOLETE: TI has discontinued production of this device.