LM3S317 Datasheet, PDF (315/379 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S317 Data Sheet
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)
Offset 0x010
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
ENreserveRdNG
VREF
Type
RO
RO
RO
RO
RO
RO
RR/OW
RR/OW
RO
RO
RO
RO
RR/OW
RR/OW
RR/OW
RR/OW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:10
9
Name
reserved
EN
8
RNG
7:4
reserved
3:0
VREF
Type
RO
R/W
R/W
RO
R/W
Reset
0
0
0
0
0
Description
Reserved bits return an indeterminate value, and should
never be changed.
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.
Reserved bits return an indeterminate value, and should
never be changed.
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 14-2 on page 310
for some output reference voltage examples.
May 4, 2007
315
Preliminary