LM3S1969 Datasheet, PDF (543/677 Pages) Texas Instruments – Stellaris® LM3S1969 Microcontroller

OBSOLETE: TI has discontinued production of this device.
Stellaris^® LM3S1969 Microcontroller
15.1
Block Diagram
Figure 15-1. Analog Comparator Module Block Diagram
C2-
-ve input _{Comparator 2}
C2+
+ve input
output
<none>
+ve input (alternate)
ACCTL2
trigger
ACSTAT2
interrupt
reference input
trigger
C1-
-ve input _{Comparator 1}
C1+
+ve input
output
<none>
+ve input (alternate)
ACCTL1
trigger
trigger
ACSTAT1
interrupt
reference input
C0-
-ve input _{Comparator 0}
C0+
+ve input
output
C0o
+ve input (alternate)
ACCTL0
trigger trigger
ACSTAT0
interrupt
reference input
internal
bus
Voltage
Ref
ACREFCTL
Interrupt Control
ACRIS
ACMIS
ACINTEN
interrupt
15.2
Signal Description
Table 15-1 on page 543 list the external signals of the Analog Comparators and describe 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 303) 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 283.
Table 15-1. Analog Comparators Signals (100LQFP)
Pin Name
Pin Number Pin Type Buffer Type^a Description
C0+
90
I
Analog Analog comparator 0 positive input.
C0-
92
I
Analog Analog comparator 0 negative input.
C0o
58
O
TTL
Analog comparator 0 output.
C1+
24
I
Analog Analog comparator 1 positive input.
C1-
91
I
Analog Analog comparator 1 negative input.
July 24, 2012
543
Texas Instruments-Production Data