LM3S1150 Datasheet, PDF (370/471 Pages) List of Unclassifed Manufacturers – Microcontroller

Analog Comparators
Register 4: Analog Comparator Reference Voltage Control (ACREFCTL), offset
0x10
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 0x10
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
reserved
EN
RNG
Type RO
RO
RO
RO
RO
RO
R/W
R/W
RO
Reset
0
0
0
0
0
0
0
0
0
22
21
RO
RO
0
0
6
5
reserved
RO
RO
0
0
20
19
18
17
16
RO
RO
RO
RO
RO
0
0
0
0
0
4
3
2
1
0
VREF
RO
R/W
R/W
R/W
R/W
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
0
0
0
0
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.
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.
The RNG bit specifies the range of the resistor ladder. If 0, the resistor
ladder has a total resistance of 32 R. If 1, the resistor ladder has a total
resistance of 24 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.
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
15-4 on page 364 for some output reference voltage examples.
370
June 14, 2007
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