LM3S1607 Luminary Micro, Inc, LM3S1607 Datasheet - Page 237
LM3S1607
Manufacturer Part Number
LM3S1607
Description
Lm3s1607 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1607.pdf
(548 pages)
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10
10.1
June 02, 2008
General-Purpose Input/Outputs (GPIOs)
The GPIO module is composed of five physical GPIO blocks, each corresponding to an individual
GPIO port (Port A, Port B, Port C, Port D, and Port E, ). The GPIO module supports 0-33
programmable input/output pins, depending on the peripherals being used.
The GPIO module has the following features:
■
■
■
■
■
■
Functional Description
Important:
Each GPIO port is a separate hardware instantiation of the same physical block(see Figure
10-1 on page 238 and Figure 10-2 on page 239). The LM3S1607 microcontroller contains five ports
and thus five of these physical GPIO blocks.
Two means of port access: either high speed (for single-cyle writes), or legacy for
backwards-compatibility with existing code
Programmable control for GPIO interrupts
–
–
–
5-V-tolerant input/outputs
Bit masking in both read and write operations through address lines
Pins configured as digital inputs are Schmitt-triggered.
Programmable control for GPIO pad configuration:
–
–
–
–
–
Interrupt generation masking
Edge-triggered on rising, falling, or both
Level-sensitive on High or Low values
Weak pull-up or pull-down resistors
2-mA, 4-mA, and 8-mA pad drive for digital communication; up to four pads can be configured
with an 18-mA pad drive for high-current applications
Slew rate control for the 8-mA drive
Open drain enables
Digital input enables
All GPIO pins are tri-stated by default (GPIOAFSEL=0, GPIODEN=0, GPIOPDR=0,
and GPIOPUR=0), with the exception of the four JTAG/SWD pins (PC[3:0]). The
JTAG/SWD pins default to their JTAG/SWD functionality (GPIOAFSEL=1, GPIODEN=1
and GPIOPUR=1). A Power-On-Reset (POR) or asserting RST puts both groups of pins
back to their default state.
Preliminary
LM3S1607 Microcontroller
237
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