17 Signal Tables
The following tables list the signals available for each pin. Functionality is enabled by software with
the GPIOAFSEL register.
Important: All multiplexed pins are GPIOs by default, with the exception of the five JTAG pins (PB7
and PC[3:0]) which default to the JTAG functionality.
Table 17-1 on page 461 shows the pin-to-signal-name mapping, including functional characteristics
of the signals. Table 17-2 on page 465 lists the signals in alphabetical order by signal name.
Table 17-3 on page 468 groups the signals by functionality, except for GPIOs. Table 17-4 on page 470
lists the GPIO pins and their alternate functionality.
17.1 100-Pin LQFP Package Pin Tables
Table 17-1. Signals by Pin Number
DescriptionBuffer Type
a
Pin TypePin NamePin Number
No connect. Leave the pin electrically unconnected/isolated.--NC1
No connect. Leave the pin electrically unconnected/isolated.--NC2
The positive supply (3.3 V) for the analog circuits (ADC, Analog
Comparators, etc.). These are separated from VDD to minimize
the electrical noise contained on VDD from affecting the analog
functions. VDDA pins must be connected to 3.3 V, regardless of
system implementation.
Power-VDDA3
The ground reference for the analog circuits ( etc.). These are
separated from GND to minimize the electrical noise contained on
VDD from affecting the analog functions.
Power-GNDA4
GPIO port E bit 5.TTLI/OPE55
CAN module 2 transmit.TTLOCAN2Tx
GPIO port E bit 4.TTLI/OPE46
CAN module 2 receive.TTLICAN2Rx
Low drop-out regulator output voltage. This pin requires an external
capacitor between the pin and GND of 1 µF or greater. When the
on-chip LDO is used to provide power to the logic, the LDO pin
must also be connected to the VDD25 pins at the board level in
addition to the decoupling capacitor(s).
Power-LDO7
Positive supply for I/O and some logic.Power-VDD8
Ground reference for logic and I/O pins.Power-GND9
GPIO port D bit 0.TTLI/OPD010
CAN module 0 receive.TTLICAN0Rx
GPIO port D bit 1.TTLI/OPD111
CAN module 0 transmit.TTLOCAN0Tx
GPIO port D bit 2.TTLI/OPD212
GPIO port D bit 3.TTLI/OPD313
Positive supply for most of the logic function, including the
processor core and most peripherals.
Power-VDD2514
Ground reference for logic and I/O pins.Power-GND15
461June 22, 2010
Texas Instruments-Production Data
Stellaris® LM3S8530 Microcontroller