LM3S600 Bookham Technology, Inc., LM3S600 Datasheet - Page 328
LM3S600
Manufacturer Part Number
LM3S600
Description
Microcontroller
Manufacturer
Bookham Technology, Inc.
Datasheet
1.LM3S600.pdf
(378 pages)
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Analog Comparators
328
Figure 14-2. 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 14-1. Comparator 0 Operating Modes
Table 14-2. Comparator 1 Operating Modes
a. C1o and C1+ signals share a single pin and may only be used as one or the other.
ACCNTL0
ASRCP
00
01
10
11
ACCNTL1
ASRCP
00
01
10
11
reference input
+ve input
Comparator 0
VIN-
Comparator 1
VIN-
C0-
C0-
C0-
C0-
C1-
C1-
C1-
C1-
-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
VIN+
C1o/C1+
reserved
C0+
C0+
Vref
C0+
Vref
a
Output
0
1
2
Output
C1o/C1+
C1o/C1+
C1o/C1+
C1o/C1+
C0o
C0o
C0o
C0o
ACCTL
Interrupt
Interrupt
yes
yes
yes
yes
yes
yes
yes
yes
Preliminary
CINV
ACSTAT
IntGen
output
October 01, 2007
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