LM3S6G11 Datasheet, PDF (731/827 Pages) Texas Instruments – Stellaris® LM3S6G11 Microcontroller

OBSOLETE: TI has discontinued production of this device.
Stellaris^® LM3S6G11 Microcontroller
18
Signal Tables
The following tables list the signals available for each pin. Signals are configured as GPIOs on reset,
except for those noted below. Use the GPIOAMSEL register (see page 428) to select analog mode.
For a GPIO pin to be used for an alternate digital function, the corresponding bit in the GPIOAFSEL
register (see page 412) must be set. Further pin muxing options are provided through the PMCx bit
field in the GPIOPCTL register (see page 429), which selects one of several available peripheral
functions for that GPIO.
Important: All GPIO pins are configured as GPIOs by default with the exception of the pins shown
in the table below. A Power-On-Reset (POR) or asserting RST puts the pins back to their
default state.
Table 18-1. GPIO Pins With Default Alternate Functions
GPIO Pin
PA[1:0]
PA[5:2]
PB[3:2]
PC[3:0]
Default State
UART0
SSI0
I²C0
JTAG/SWD
GPIOAFSEL Bit GPIOPCTL PMCx Bit Field
0
0x1
0
0x1
0
0x1
1
0x3
Table 18-2 on page 732 shows the pin-to-signal-name mapping, including functional characteristics
of the signals. Each possible alternate analog and digital function is listed for each pin.
Table 18-3 on page 738 lists the signals in alphabetical order by signal name. If it is possible for a
signal to be on multiple pins, each possible pin assignment is listed. The "Pin Mux" column indicates
the GPIO and the encoding needed in the PMCx bit field in the GPIOPCTL register.
Table 18-4 on page 744 groups the signals by functionality, except for GPIOs. If it is possible for a
signal to be on multiple pins, each possible pin assignment is listed.
Table 18-5 on page 749 lists the GPIO pins and their digital alternate functions. Other analog signals
are 5-V tolerant and are connected directly to their circuitry (C0-, C0+, C1-, C1+). These signals are
configured by clearing the DEN bit in the GPIO Digital Enable (GPIODEN) register. The digital
signals 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 enoding shown in the table below. Table entries that are shaded
gray are the default values for the corresponding GPIO pin.
Table 18-6 on page 750 lists the signals based on number of possible pin assignments. This table
can be used to plan how to configure the pins for a particular functionality. Application Note AN01274
Configuring Stellaris^® Microcontrollers with Pin Multiplexing provides an overview of the pin muxing
implementation, an explanation of how a system designer defines a pin configuration, and examples
of the pin configuration process.
Note: All digital inputs are Schmitt triggered.
July 24, 2012
731
Texas Instruments-Production Data