LM3S1620 Datasheet, PDF (371/485 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S1620 Microcontroller
Figure 15-2. Structure of Comparator Unit
-ve input
+ve input ⁰
+ve input (alternate) ¹
CINV
reference input ²
ACCTL
output
IntGen
ACSTAT
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: 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.
Table 15-1. Comparator 0 Operating Modes
ACCNTL0 Comparator 0
ASRCP VIN- VIN+ Output Interrupt
00
C0+ C0o yes
yes
01
C0- C0+ C0o
yes
10
C0- Vref C0o
yes
11
C0- reserved C0o
yes
Table 15-2. Comparator 1 Operating Modes
ACCNTL1 Comparator 1
ASRCP VIN- VIN+ Output Interrupt
00
C1- C1o/C1+ C1o/C1+ yes
01
C1- C0+ C1o/C1+ yes
10
C1- Vref C1o/C1+ yes
11
C1- reserved C1o/C1+ yes
September 02, 2007
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Preliminary