LM3S1636_13 Datasheet, PDF (548/655 Pages) Texas Instruments – Stellaris Microcontroller

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Analog Comparators
Register 4: Analog Comparator Reference Voltage Control (ACREFCTL), offset
0x010
This register specifies whether the resistor ladder is powered on as well as the range and tap.
Analog Comparator Reference Voltage Control (ACREFCTL)
Base 0x4003.C000
Offset 0x010
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
EN
RNG
reserved
VREF
Type RO
RO
RO
RO
RO
RO
R/W
R/W
RO
RO
RO
RO
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:10
9
8
7:4
3:0
Name
reserved
EN
RNG
reserved
VREF
Type
RO
R/W
R/W
RO
R/W
Reset
0x00
0
0
0x00
0x00
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.
Resistor Ladder Enable
The EN bit specifies whether the resistor ladder is powered on. If 0, the
resistor ladder is unpowered. If 1, the resistor ladder is connected to
the analog V_DD.
This bit is reset to 0 so that the internal reference consumes the least
amount of power if not used and programmed.
Resistor Ladder Range
The RNG bit specifies the range of the resistor ladder. If 0, the resistor
ladder has a total resistance of 31 R. If 1, the resistor ladder has a total
resistance of 23 R.
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.
Resistor Ladder Voltage Ref
The VREF bit field specifies the resistor ladder tap that is passed through
an analog multiplexer. The voltage corresponding to the tap position is
the internal reference voltage available for comparison. See Table
15-2 on page 543 for some output reference voltage examples.
548
July 24, 2012
Texas Instruments-Production Data