LM3S1911-IQC20-A0 ETC2 [List of Unclassifed Manufacturers], LM3S1911-IQC20-A0 Datasheet - Page 366
LM3S1911-IQC20-A0
Manufacturer Part Number
LM3S1911-IQC20-A0
Description
Microcontroller
Manufacturer
ETC2 [List of Unclassifed Manufacturers]
Datasheet
1.LM3S1911-IQC20-A0.pdf
(426 pages)
- Current page: 366 of 426
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Analog Comparators
366
VIN- < VIN+, VOUT = 1
VIN- > VIN+, VOUT = 0
As shown in Figure 15-2 on page 366, the input source for VIN- is an external input. In addition to
an external input, input sources for VIN+ can be the +ve input of comparator 0 or an internal reference.
Figure 15-2. Structure of Comparator Unit
+ve input (alternate)
A comparator is configured through two status/control registers (ACCTL and ACSTAT ). The internal
reference is configured through one control register (ACREFCTL). Interrupt status and control is
configured through three registers (ACMIS, ACRIS, and ACINTEN). The operating modes of the
comparators are shown in the Comparator Operating Mode tables.
Typically, the comparator output is used internally to generate controller interrupts. It may also be
used to drive an external pin.
Important:
Table 15-1. Comparator 0 Operating Modes
ACCNTL0
ASRCP
00
01
10
11
reference input
+ve input
Comparator 0
VIN-
C0-
C0-
C0-
C0-
-ve input
Certain register bit values must be set before using the analog comparators. The proper
pad configuration for the comparator input and output pins are described in the
Comparator Operating Mode tables.
VIN+
reserved
C0+
C0+
Vref
Output
0
1
2
C0o
C0o
C0o
C0o
ACCTL
Interrupt
yes
yes
yes
yes
Preliminary
CINV
ACSTAT
IntGen
output
October 09, 2007
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