LM3S9B81 Datasheet, PDF (1079/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Stellaris® LM3S9B81 Microcontroller
Table 23-11. Possible Pin Assignments for Alternate Functions (continued)
# of Possible Assignments
eight
ten
Alternate Function
CCP1
CCP3
CCP0
CCP2
GPIO Function
PC5 PC4 PA6 PJ6 PB1 PB6 PE3 PD7
PE4 PC6 PC5 PA7 PF1 PB2 PE0 PD4
PD3 PC7 PC6 PJ2 PF4 PJ7 PB0 PB2 PB5 PD4
PE4 PD1 PC4 PF5 PJ5 PB1 PE1 PB5 PE2 PD5
23.3
Connections for Unused Signals
Table 23-12 on page 1079 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 23-12. Connections for Unused Signals (100-pin LQFP)
Function
Ethernet
Signal Name
ERBIAS
GPIO
No Connects
System
Control
MDIO
RXIN
RXIP
TXON
TXOP
XTALNPHY
XTALPPHY
All unused GPIOs
NC
OSC0
OSC1
RST
USB
USB0RBIAS
USB0DM
USB0DP
Pin Number
Acceptable Practice
Preferred Practice
33
Connect to GND through Connect to GND through 12.4-kΩ
12.4-kΩ resistor.
resistor.
58
NC
NC
37
NC
GND
40
NC
GND
46
NC
GND
43
NC
GND
17
NC
NC
16
NC
GND
-
NC
GND
-
NC
NC
48
NC
GND
49
NC
NC
48
Pull up as shown in Figure Connect through a capacitor to
6-1 on page 99
GND as close to pin as possible
73
Connect to GND through 10-kΩ Connect to GND through 10-kΩ
resistor.
resistor.
70
NC
GND
71
NC
GND
Table 23-13 on page 1080 show how to handle signals for functions that are not used in a particular
system implementation for devices that are in a 108-pin BGA 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.
June 29, 2010
Texas Instruments-Advance Information
1079