TM4C123AH6PM_15 Datasheet, PDF (595/1238 Pages) Texas Instruments – Tiva TM4C123AH6PM Microcontroller

Tiva^™ TM4C123AH6PM Microcontroller
9 General-Purpose Input/Outputs (GPIOs)
The GPIO module is composed of seven physical GPIO blocks, each corresponding to an individual
GPIO port (Port A, Port B, Port C, Port D, Port E, Port F, Port G). The GPIO module supports up to
49 programmable input/output pins, depending on the peripherals being used.
The GPIO module has the following features:
■ Up to 49 GPIOs, depending on configuration
■ Highly flexible pin muxing allows use as GPIO or one of several peripheral functions
■ 5-V-tolerant in input configuration
■ Ports A-G accessed through the Advanced Peripheral Bus (APB)
■ Fast toggle capable of a change every clock cycle for ports on AHB, every two clock cycles for
ports on APB
■ Programmable control for GPIO interrupts
– Interrupt generation masking
– Edge-triggered on rising, falling, or both
– Level-sensitive on High or Low values
■ Bit masking in both read and write operations through address lines
■ Can be used to initiate an ADC sample sequence or a μDMA transfer
■ Pins configured as digital inputs are Schmitt-triggered
■ Programmable control for GPIO pad configuration
– Weak pull-up or pull-down resistors
– 2-mA, 4-mA, and 8-mA pad drive for digital communication; up to four pads can sink 18-mA
for high-current applications
– Slew rate control for 8-mA pad drive
– Open drain enables
– Digital input enables
9.1 Signal Description
GPIO signals have alternate hardware functions. The following table lists the GPIO pins and their
analog and digital alternate functions. All GPIO signals are 5-V tolerant when configured as inputs
except for PD4, PD5, PB0 and PB1, which are limited to 3.6 V. The digital alternate hardware functions
are enabled by setting the appropriate bit in the GPIO Alternate Function Select (GPIOAFSEL)
and GPIODEN registers and configuring the PMCx bit field in the GPIO Port Control (GPIOPCTL)
register to the numeric encoding shown in the table below. Analog signals in the table below are
also 5-V tolerant and are configured by clearing the DEN bit in the GPIO Digital Enable (GPIODEN)
June 12, 2014
595
Texas Instruments-Production Data