Texas Instruments TM4C1294NCPDT User Manual

Pull Up Select (GPIOPUR) register (see page 776), GPIO Pull-Down Select (GPIOPDR) register
(see page 778), and GPIO Digital Enable (GPIODEN) register (see page 781) are not committed to
storage unless the GPIO Lock (GPIOLOCK) register (see page 783) has been unlocked and the
appropriate bits of the GPIO Commit (GPIOCR) register (see page 784) have been set.
When using the I
2
C module, in addition to setting the GPIOAFSEL register bits for the I
2
C clock
and data pins, the data pins should be set to open drain using the GPIO Open Drain Select
(GPIOODR) register (see examples in “Initialization and Configuration” on page 753).
GPIO Alternate Function Select (GPIOAFSEL)
GPIO Port A (AHB) base: 0x4005.8000
GPIO Port B (AHB) base: 0x4005.9000
GPIO Port C (AHB) base: 0x4005.A000
GPIO Port D (AHB) base: 0x4005.B000
GPIO Port E (AHB) base: 0x4005.C000
GPIO Port F (AHB) base: 0x4005.D000
GPIO Port G (AHB) base: 0x4005.E000
GPIO Port H (AHB) base: 0x4005.F000
GPIO Port J (AHB) base: 0x4006.0000
GPIO Port K (AHB) base: 0x4006.1000
GPIO Port L (AHB) base: 0x4006.2000
GPIO Port M (AHB) base: 0x4006.3000
GPIO Port N (AHB) base: 0x4006.4000
GPIO Port P (AHB) base: 0x4006.5000
GPIO Port Q (AHB) base: 0x4006.6000
Offset 0x420
Type RW, reset -
16171819202122232425262728293031
reserved
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
0123456789101112131415
AFSELreserved
RWRWRWRWRWRWRWRWROROROROROROROROType
--------00000000Reset
DescriptionResetTypeNameBit/Field
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x0000.00ROreserved31:8
GPIO Alternate Function Select
DescriptionValue
The associated pin functions as a GPIO and is controlled by
the GPIO registers.
0
The associated pin functions as a peripheral signal and is
controlled by the alternate hardware function.
The reset value for this register is 0x0000.0000 for GPIO ports
that are not listed in Table 10-1 on page 743.
1
-RWAFSEL7:0
771June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller

Texas Instruments TM4C1294NCPDT Specifications

General

Brand	Texas Instruments
Model	TM4C1294NCPDT
Category	Microcontrollers
Language	English