LM3S1637 Luminary Micro, Inc, LM3S1637 Datasheet - Page 170
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LM3S1637
Manufacturer Part Number
LM3S1637
Description
Lm3s1637 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1637.pdf
(547 pages)
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- Current page: 170 of 547
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General-Purpose Input/Outputs (GPIOs)
9.2
Table 9-1. GPIO Pad Configuration Examples
a. X=Ignored (don’t care bit)
?=Can be either 0 or 1, depending on the configuration
Table 9-2. GPIO Interrupt Configuration Example
170
Configuration
Digital Input (GPIO)
Digital Output (GPIO)
Open Drain Input
(GPIO)
Open Drain Output
(GPIO)
Open Drain
Input/Output (I
Digital Input (Timer
CCP)
Digital Input (QEI)
Digital Output (PWM)
Digital Output (Timer
PWM)
Digital Input/Output
(SSI)
Digital Input/Output
(UART)
Analog Input
(Comparator)
Digital Output
(Comparator)
Register
GPIOIS
GPIOIBE
Desired
Interrupt
Event
Trigger
2
Initialization and Configuration
To use the GPIO, the peripheral clock must be enabled by setting the appropriate GPIO Port bit
field (GPIOn) in the RCGC2 register.
On reset, all GPIO pins (except for the five JTAG pins) are configured out of reset to be undriven
(tristate): GPIOAFSEL=0, GPIODEN=0, GPIOPDR=0, and GPIOPUR=0. Table 9-1 on page 170
shows all possible configurations of the GPIO pads and the control register settings required to
achieve them. Table 9-2 on page 170 shows how a rising edge interrupt would be configured for pin
2 of a GPIO port.
C)
0=single
0=edge
1=level
1=both
edges
edge
GPIO Register Bit Value
AFSEL
0
0
0
0
1
1
1
1
1
1
1
0
1
Pin 2 Bit Value
7
X
X
DIR
X
X
X
X
X
X
X
X
0
1
0
1
0
6
a
ODR
X
X
a
0
0
1
1
1
0
0
0
0
0
0
0
0
5
DEN
X
X
Preliminary
1
1
1
1
1
1
1
1
1
1
1
0
1
PUR
4
?
?
X
X
X
?
?
?
?
?
?
0
?
X
X
PDR
3
?
?
X
X
X
?
?
?
?
?
?
0
?
X
X
DR2R
X
X
X
X
X
?
?
?
?
?
?
?
?
2
0
0
DR4R
X
X
X
X
X
?
?
?
?
?
?
?
?
1
DR8R
X
X
X
X
X
X
X
?
?
?
?
?
?
?
?
July 25, 2008
0
SLR
X
X
X
X
X
X
X
?
?
?
?
?
?
?
?
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