LM3S600 Bookham Technology, Inc., LM3S600 Datasheet - Page 119

• Manufacturer Part Number: LM3S600
• Description: Microcontroller
• Manufacturer: Bookham Technology, Inc.

8
8.1
October 01, 2007
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 is FiRM-compliant and
supports 8-36 programmable input/output pins, depending on the peripherals being used.
The GPIO module has the following features:
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Functional Description
Important:
Each GPIO port is a separate hardware instantiation of the same physical block (see Figure
8-1 on page 120). The LM3S600 microcontroller contains five ports and thus five of these physical
GPIO blocks.
Programmable control for GPIO interrupts
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5-V-tolerant input/outputs
Bit masking in both read and write operations through address lines
Programmable control for GPIO pad configuration
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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
Slew rate control for the 8-mA drive
Open drain enables
Digital input enables
All GPIO pins are inputs by default (GPIODIR=0 and GPIOAFSEL=0), with the exception
of the five JTAG pins (PB7 and PC[3:0]). The JTAG pins default to their JTAG
functionality (GPIOAFSEL=1). A Power-On-Reset (POR) or asserting an external reset
(RST) puts both groups of pins back to their default state.
Preliminary
LM3S600 Microcontroller
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