TM4C1290NCZAD Datasheet, PDF (1580/1648 Pages) Texas Instruments – Tiva Microcontroller

Signal Tables
Table 25-6. Possible Pin Assignments for Alternate Functions (continued)
# of Possible Assignments
five
Alternate Function
I2C2SCL
I2C2SDA
U0CTS
GPIO Function
PG2 PL1 PN5 PP5 PR2
PG3 PL0 PN4 PP6 PR3
PB4 PE6 PG4 PH1 PM4
25.6
Connections for Unused Signals
Table 25-7 on page 1580 show how to handle signals for functions that are not used in a particular
system implementation for devices that are in a 212-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 25-7. Connections for Unused Signals (212-Ball BGA)
Function
Signal Name
Pin Number
Acceptable Practice
Preferred Practice
VREFA+
F4
ADC
VREFA-
G5
PA1(UART0TX)
W3
GPIO
PA4 (SSI0XDAT0)
V4
VDDA
GND
NC
NC
VDDA
GND
GND^a
GND^b
All unused GPIOs
-
NC
GND
GNDX
R18
GND
GND
HIB
M17
NC
NC
Hibernate
VBAT
WAKE
P19
NC
U18
NC
VDD
GND
XOSC0
T18
NC
GND
XOSC1
T19
NC
NC
No
NC
See NC pin numbers in
NC
NC
Connects
Table 25-3 on page 1540
GNDX2
D18
GND
GND
System
Control
OSC0
OSC1
RST
E19
NC
GND
D19
NC
NC
P18
VDD
Pull up as shown in Figure
5-1 on page 219
USB0DM / PL7
B18
USB
USB0DP /PL6
C18
NC
Pull-down to GND with 1K
resistor^c
NC
Pull-down to GND with 1K
resistor^c
a. PA1 (UART0TX) may be enabled as an output by the ROM boot loader if no code is present in the flash and PA0 (UART0RX)
receives a valid boot signature. Ensure that this condition will not occur if PA1 is to be connected directly to GND.
b. PA4 (SSI0XDAT0) may be enabled as an output by the ROM boot loader if no code is present in the flash and the SSI0X
(PA2, PA3, PA5) receives a valid boot signature. Ensure that this condition will not occur if PA4 is to be connected
directly to GND.
c. The ROM boot loader may configure these pins as USB pins if no code is present in the flash therefore they should not
be directly connected to ground.
1580
Texas Instruments-Production Data
June 18, 2014