LM3S101 Luminary Micro, Inc., LM3S101 Datasheet - Page 263

• Manufacturer Part Number: LM3S101
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

13.2.1
October 5, 2006
Table 13-2. Comparator 1 Operating Modes
a. C0o and C1- signals share a single pin and may only be used as one or the other.
Internal Reference Programming
The structure of the internal reference is shown in Figure 13-3. This is controlled by a single
configuration register (ACREFCTL). Table 13-3 shows the programming options to develop
specific internal reference values, to compare an external voltage against a particular voltage
generated internally.
Figure 13-3. Comparator Internal Reference Structure
Table 13-3. Internal Reference Voltage and ACREFCTL Field Values
EN Bit Value
ACCNTL1
EN=0
ASRCP
ACREFCTL Register
11
VREF
RNG
EN
RNG Bit Value
RNG=X
AVDD
C0o/C1-
VIN-
8R
Preliminary
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
Output Reference Voltage Based on VREF Field Value
15
R
reserved
VIN+
14
•••
Decoder
•••
Comparator 1
R
1
R
0
Output
n/a
8R
internal
reference
LM3S101 Data Sheet
Interrupt
yes
263