LM3S818 Luminary Micro, Inc, LM3S818 Datasheet - Page 307

• Manufacturer Part Number: LM3S818
• Description: Lm3s818 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

February 6, 2007
Reset
Reset
Type
Type
Bit/Field
31:10
Analog Comparator Reference Voltage Control (ACREFCTL)
Offset 0x010
7:4
3:0
9
8
RO
RO
31
15
0
0
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.
RO
RO
30
14
0
0
reserved
reserved
Name
VREF
RNG
EN
RO
RO
29
13
0
0
RO
RO
28
12
0
0
Type
R/W
R/W
R/W
RO
RO
RO
RO
27
11
0
0
RO
RO
26
10
0
0
Reset
0
0
0
0
0
EN
R/W
RO
RO
25
0
9
0
0
Preliminary
reserved
RNG
R/W
RO
RO
24
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
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 302
for some output reference voltage examples.
0
8
0
0
reserved
RO
RO
23
0
7
0
RO
RO
22
0
6
0
RO
RO
21
0
5
0
RO
RO
20
0
4
0
R/W
DD
RO
RO
19
0
3
0
0
.
LM3S818 Data Sheet
R/W
RO
RO
18
0
2
0
0
VREF
R/W
RO
RO
17
0
1
0
0
R/W
RO
RO
16
0
0
0
0
307