LM3S6611-IQC20-A0T ETC2 [List of Unclassifed Manufacturers], LM3S6611-IQC20-A0T Datasheet - Page 412

• Manufacturer Part Number: LM3S6611-IQC20-A0T
• Description: Microcontroller
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

Analog Comparators
412
VIN- < VIN+, VOUT = 1
VIN- > VIN+, VOUT = 0
As shown in Figure 16-2 on page 412, 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 16-2. 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 16-1. 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