LM3S300-IQN25-C2 Datasheet, PDF (437/498 Pages) Texas Instruments – Stellaris LM3S300 Microcontroller

NRND: Not recommended for new designs.
Stellaris^® LM3S300 Microcontroller
13.1
Block Diagram
Figure 13-1. Analog Comparator Module Block Diagram
C2-
-ve input _{Comparator 2}
C2+
+ve input
output
C2o
+ve input (alternate)
ACCTL2
ACSTAT2
interrupt
reference input
C1-
-ve input _{Comparator 1}
C1+
+ve input
output
C1o
+ve input (alternate)
ACCTL1
ACSTAT1
interrupt
reference input
C0-
-ve input _{Comparator 0}
C0+
+ve input
output
C0o
+ve input (alternate)
ACCTL0
ACSTAT0
interrupt
reference input
internal
bus
Voltage
Ref
ACREFCTL
Interrupt Control
ACRIS
ACMIS
ACINTEN
interrupt
13.2
Signal Description
Table 13-1 on page 437 lists the external signals of the Analog Comparators and describes the
function of each. The Analog Comparator output signals are alternate functions for some GPIO
signals and default to be GPIO signals at reset. The column in the table below titled "Pin Assignment"
lists the possible GPIO pin placements for the Analog Comparator signals. The AFSEL bit in the
GPIO Alternate Function Select (GPIOAFSEL) register (page 240) should be set to choose the
Analog Comparator function. The positive and negative input signals are configured by clearing the
DEN bit in the GPIO Digital Enable (GPIODEN) register. For more information on configuring GPIOs,
see “General-Purpose Input/Outputs (GPIOs)” on page 222.
Table 13-1. Analog Comparators Signals (48QFP)
Pin Name
Pin Number Pin Type Buffer Type^a Description
C0+
42
I
Analog Analog comparator 0 positive input.
C0-
44
I
Analog Analog comparator 0 negative input.
C0o
48
O
TTL
Analog comparator 0 output.
June 18, 2012
437
Texas Instruments-Production Data