LM3S2965_0711 Datasheet, PDF (454/574 Pages) List of Unclassifed Manufacturers – Microcontroller

Analog Comparators
17.2.1
Table 17-3. Comparator 2 Operating Modes
ACCNTL2 Comparator 2
ASRCP VIN- VIN+ Output Interrupt ADC Trigger
00
C2- C2+ n/a
yes
yes
01
C2- C0+ n/a
yes
yes
10
C2- Vref n/a
yes
yes
11
C2- reserved n/a
yes
yes
Internal Reference Programming
The structure of the internal reference is shown in Figure 17-3 on page 454. This is controlled by a
single configuration register (ACREFCTL). Table 17-4 on page 454 shows the programming options
to develop specific internal reference values, to compare an external voltage against a particular
voltage generated internally.
Figure 17-3. Comparator Internal Reference Structure
AVDD
8R R
R
8R
R
R
•••
EN
VREF
RNG
15 14
•••
1
0
Decoder
internal
reference
Table 17-4. Internal Reference Voltage and ACREFCTL Field Values
ACREFCTL Register
Output Reference Voltage Based on VREF Field Value
EN Bit Value RNG Bit Value
EN=0
RNG=X
0 V (GND) for any value of VREF; however, it is recommended that RNG=1 and VREF=0
for the least noisy ground reference.
454
November 30, 2007
Preliminary