LM3S2110-IQN20-A0 Luminary Micro, Inc., LM3S2110-IQN20-A0 Datasheet - Page 391

• Manufacturer Part Number: LM3S2110-IQN20-A0
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

15.2.1
November 29, 2007
Table 15-3. Comparator 2 Operating Modes
Internal Reference Programming
The structure of the internal reference is shown in Figure 15-3 on page 391. This is controlled by a
single configuration register (ACREFCTL). Table 15-4 on page 391 shows the programming options
to develop specific internal reference values, to compare an external voltage against a particular
voltage generated internally.
Figure 15-3. Comparator Internal Reference Structure
VREF
Table 15-4. Internal Reference Voltage and ACREFCTL Field Values
ACCNTL2
ASRCP
00
01
10
11
ACREFCTL Register
EN Bit Value
RNG
EN
EN=0
AVDD
Comparator 2
VIN-
C2-
C2-
C2-
C2-
RNG Bit Value
VIN+
reserved
RNG=X
C2+
C0+
Vref
8R
Output
n/a
n/a
n/a
n/a
Output Reference Voltage Based on VREF Field Value
0 V (GND) for any value of VREF; however, it is recommended that RNG=1 and VREF=0
for the least noisy ground reference.
R
Interrupt
yes
yes
yes
yes
15
R
Preliminary
14
Decoder
R
1
R
0
8R
LM3S2110 Microcontroller
internal
reference
391