LM3S6422 Datasheet, PDF (557/609 Pages) Texas Instruments – Stellaris® LM3S6422 Microcontroller

Stellaris^® LM3S6422 Microcontroller
Table 16-8. GPIO Pins and Alternate Functions (continued)
IO
Pin Number
Multiplexed Function
PD3
H1
PD4
E1
PD5
E2
PD6
F2
PD7
F1
C0o
PF0
M9
PF1
H12
PF2
J11
LED1
PF3
J12
LED0
Multiplexed Function
16.3
Connections for Unused Signals
Table 16-9 on page 557 show how to handle signals for functions that are not used in a particular
system implementation for devices that are in a 100-pin LQFP package. Two options are shown in
the table: an acceptable practice and a preferred practice for reduced power consumption and
improved EMC characteristics. If a module is not used in a system, and its inputs are grounded, it
is important that the clock to the module is never enabled by setting the corresponding bit in the
RCGCx register.
Table 16-9. Connections for Unused Signals (100-pin LQFP)
Function
ADC
Signal Name
ADC0
ADC1
ERBIAS
GNDPHY
Ethernet
MDIO^a
RXIN
RXIP
TXON
TXOP
VCCPHY
GPIO
No Connects
XTALNPHY^a
XTALPPHY^a
All unused GPIOs
NC
Pin Number
1
2
41
42
85
86
58
37
40
46
43
36
83
84
17
16
-
-
Acceptable Practice
NC
Connect to GND through
12.4-kΩ resistor.
GND
NC
NC
NC
NC
NC
VDD
NC
NC
NC
NC
Preferred Practice
GNDA
Connect to GND through
12.4-kΩ resistor.
GND
NC
GND
GND
GND
GND
VDD
NC
GND
GND
NC
June 18, 2012
557
Texas Instruments-Production Data