LM3S6938 Luminary Micro, Inc, LM3S6938 Datasheet - Page 472

• Manufacturer Part Number: LM3S6938
• Description: Lm3s6938 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Signal Tables
19
19.1
472
Signal Tables
The following tables list the signals available for each pin. Functionality is enabled by software with
the GPIOAFSEL register.
Important:
Table 19-1 on page 472 shows the pin-to-signal-name mapping, including functional characteristics
of the signals. Table 19-2 on page 476 lists the signals in alphabetical order by signal name.
Table 19-3 on page 480 groups the signals by functionality, except for GPIOs. Table 19-4 on page
483 lists the GPIO pins and their alternate functionality.
100-Pin LQFP Package Pin Tables
Table 19-1. Signals by Pin Number
Pin Number
10
11
12
13
14
1
2
3
4
5
6
7
8
9
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.
Pin Name
VDD25
ADC0
ADC1
VDDA
GNDA
ADC2
ADC3
U1Rx
U1Tx
LDO
VDD
GND
PD0
PD1
PD2
PD3
Preliminary
Pin Type
I/O
I/O
I/O
I/O
O
-
-
-
-
-
-
I
I
I
I
I
Buffer Type
Analog
Analog
Analog
Analog
Power
Power
Power
Power
Power
Power
TTL
TTL
TTL
TTL
TTL
TTL
Description
Analog-to-digital converter input 0.
Analog-to-digital converter input 1.
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.
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.
Analog-to-digital converter input 2.
Analog-to-digital converter input 3.
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).
Positive supply for I/O and some logic.
Ground reference for logic and I/O pins.
GPIO port D bit 0
GPIO port D bit 1
GPIO port D bit 2
UART module 1 receive. When in IrDA mode,
this signal has IrDA modulation.
GPIO port D bit 3
UART module 1 transmit. When in IrDA mode,
this signal has IrDA modulation.
Positive supply for most of the logic function,
including the processor core and most
peripherals.
July 25, 2008