Note: Port pins PM[7:4] operate as Fast GPIO pads but support only 2-, 4-, 6-, and 8-mA drive
capability. 10- and 12-mA drive are not supported. All standard GPIO register controls,
except for the GPIODR12R register, apply to these port pins.
10.3 Functional Description
Each GPIO port is a separate hardware instantiation of the same physical block (see Figure
10-1 on page 747 and Figure 10-2 on page 748). The TM4C1294NCPDT microcontroller contains 15
ports and thus 15 of these physical GPIO blocks. Note that not all pins are implemented on every
block. Some GPIO pins can function as I/O signals for the on-chip peripheral modules. For information
on which GPIO pins are used for alternate hardware functions, refer to Table 26-5 on page 1808.
Figure 10-1. Digital I/O Pads
MUX
MUX
MUX
Pad
Control
Commit
Control
Data
Control
Interrupt
Control
DEMUX
Digital
I/O
Pad
Identification Registers
GPIOPeriphID0
GPIOPeriphID1
GPIOPeriphID2
GPIOPeriphID3
GPIOPeriphID4
GPIOPeriphID5
GPIOPeriphID6
GPIOPeriphID7
GPIOPCellID0
GPIOPCellID1
GPIOPCellID2
GPIOPCellID3
Pad Input
Pad Output
Enable
GPIOLOCK
GPIOCR
GPIODATA
GPIODIR
GPIOIS
GPIOIBE
GPIOIEV
GPIOIM
GPIORIS
GPIOMIS
GPIOICR
GPIODR2R
GPIODR4R
GPIODR8R
GPIOSLR
GPIOPUR
GPIOPDR
GPIOODR
GPIODEN
Alternate Input
Alternate Output
Alternate Output Enable
Interrupt
GPIO Input
GPIO Output
GPIO Output Enable
Pad Output
Package I/O Pin
Periph 0
Periph 1
Periph n
Port
Control
GPIOPCTL
GPIODR12R
Mode
Control
GPIOAFSEL
GPIOADCCTL
GPIODMACTL
GPIOSI
GPIOAMSEL
747June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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