TM4C123FE6PM Datasheet, PDF (1184/1370 Pages) Texas Instruments – Tiva™ TM4C123FE6PM Microcontroller

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 RW, 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
RW
RW
RO
RO
RO
RO
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:10
9
8
Name
reserved
EN
RNG
Type
RO
RW
RW
Reset Description
0x0000.0
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.
0
Resistor Ladder Enable
Value Description
0 The resistor ladder is unpowered.
1 Powers on the resistor ladder. The resistor ladder is connected
to V_DDA.
This bit is cleared at reset so that the internal reference consumes the
least amount of power if it is not used.
0
Resistor Ladder Range
Value Description
0 The ideal step size for the internal reference is VDDA / 29.4.
1 The ideal step size for the internal reference is VDDA / 22.12.
7:4
reserved
RO
0x0
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.
3:0
VREF
RW
0x0
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
18-2 on page 1177 for some output reference voltage examples.
1184
Texas Instruments-Production Data
June 12, 2014