LM3S308 Datasheet, PDF (492/537 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Signal Tables
Table 16-3. Signals by Function, Except for GPIO (continued)
Function
Pin Name Pin Number Pin Type Buffer Type^a
Description
GND
8
-
Power Ground reference for logic and I/O pins.
16
24
31
LDO
Power
6
-
Power Low drop-out regulator output voltage. This pin
requires an external capacitor between the pin and
GND of 1 µF or greater.
VDD
7
-
Power Positive supply for I/O and some logic.
15
23
32
SSIClk
19
I/O
TTL
SSI clock.
SSIFss
20
I/O
TTL
SSI frame.
SSI
SSIRx
21
I
TTL
SSI receive.
SSITx
22
O
TTL
SSI transmit.
System Control &
Clocks
OSC0
OSC1
9
I
Analog Main oscillator crystal input or an external clock
reference input.
10
O
Analog Main oscillator crystal output. Leave unconnected
when using a single-ended clock source.
RST
5
I
TTL
System reset input.
U0Rx
17
I
TTL
UART module 0 receive.
UART
U0Tx
U1Rx
18
O
TTL
UART module 0 transmit.
27
I
TTL
UART module 1 receive.
U1Tx
28
O
TTL
UART module 1 transmit.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
16.4 GPIO Pins and Alternate Functions
Table 16-4. GPIO Pins and Alternate Functions
IO
Pin Number
PA0
17
PA1
18
PA2
19
PA3
20
PA4
21
PA5
22
PB0
29
PB1
30
PB2
33
PB3
34
PB4
44
PB5
43
PB6
42
PB7
41
PC0
40
Multiplexed Function
U0Rx
U0Tx
SSIClk
SSIFss
SSIRx
SSITx
CCP0
CCP2
I2CSCL
I2CSDA
C0-
CCP5
C0+
TRST
TCK
Multiplexed Function
SWCLK
492
June 18, 2012
Texas Instruments-Production Data