LM3S1621 Datasheet, PDF (883/947 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S1621 Microcontroller
Table 19-11. Possible Pin Assignments for Alternate Functions (continued)
# of Possible Assignments
seven
eight
nine
Alternate Function
CCP5
CCP1
CCP0
CCP2
CCP3
GPIO Function
PE5 PD2 PC4 PG7 PG5 PB6 PB5
PC5 PC4 PA6 PF6 PB1 PB6 PE3 PD7
PD3 PC7 PC6 PJ2 PF4 PB0 PB2 PB5 PD4
PE4 PD1 PC4 PF5 PB1 PE1 PB5 PE2 PD5
PE4 PC6 PC5 PA7 PG4 PF1 PB2 PE0 PD4
19.3
Connections for Unused Signals
Table 19-12 on page 883 shows 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 19-12. Connections for Unused Signals (100-Pin LQFP)
Function
GPIO
Hibernate
No Connects
System Control
Signal Name
All unused GPIOs
HIB
VBAT
WAKE
XOSC0
XOSC1
NC
OSC0
OSC1
RST
Pin Number
-
51
55
50
52
53
-
48
49
64
Acceptable Practice
Preferred Practice
NC
GND
NC
NC
NC
GND
NC
GND
NC
GND
NC
NC
NC
NC
NC
GND
NC
NC
Pull up as shown in Figure Connect through a capacitor to
5-1 on page 183
GND as close to pin as possible
Table 19-13 on page 883 shows how to handle signals for functions that are not used in a particular
system implementation for devices that are in a 108-ball 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.
Table 19-13. Connections for Unused Signals (108-Ball BGA)
Function
GPIO
Hibernate
No Connects
Signal Name
All unused GPIOs
HIB
VBAT
WAKE
XOSC0
XOSC1
NC
Pin Number
-
M12
L12
M10
K11
K12
-
Acceptable Practice
NC
NC
NC
NC
NC
NC
NC
Preferred Practice
GND
NC
GND
GND
GND
NC
NC
January 21, 2012
883
Texas Instruments-Production Data