Datasheet
21 Signal Tables
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.
The following tables list the signals available for each pin. Functionality is enabled by software with
the GPIOAFSEL register. All digital inputs are Schmitt triggered.
■ Signals by Pin Number
■ Signals by Signal Name
■ Signals by Function, Except for GPIO
■ GPIO Pins and Alternate Functions
■ Connections for Unused Signals
21.1 100-Pin LQFP Package Pin Tables
21.1.1 Signals by Pin Number
Table 21-1. Signals by Pin Number
DescriptionBuffer Type
a
Pin TypePin NamePin Number
Analog-to-digital converter input 0.AnalogIADC0
1
Analog-to-digital converter input 1.AnalogIADC1
2
The positive supply 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 supplied with a voltage that meets
the specification in “Recommended DC Operating
Conditions” on page 748, regardless of system implementation.
Power-VDDA
3
The ground reference for the analog circuits (ADC, Analog
Comparators, etc.). These are separated from GND to minimize
the electrical noise contained on VDD from affecting the analog
functions.
Power-GNDA
4
Analog-to-digital converter input 2.AnalogIADC2
5
Analog-to-digital converter input 3.AnalogIADC3
6
Low drop-out regulator output voltage. This pin requires an external
capacitor between the pin and GND of 1 µF or greater. The LDO
pin must also be connected to the VDD25 pins at the board level
in addition to the decoupling capacitor(s).
Power-LDO
7
Positive supply for I/O and some logic.Power-VDD
8
Ground reference for logic and I/O pins.Power-GND
9
GPIO port D bit 0.TTLI/OPD0
10
CAN module 0 receive.TTLICAN0Rx
GPIO port D bit 1.TTLI/OPD1
11
CAN module 0 transmit.TTLOCAN0Tx
GPIO port D bit 2.TTLI/OPD2
12
UART module 1 receive. When in IrDA mode, this signal has IrDA
modulation.
TTLIU1Rx
June 18, 2012718
Texas Instruments-Production Data
Signal Tables
NRND: Not recommended for new designs.