Datasheet

Hardware Description
16 January 6, 2010
Interfacing to the EVB
An array of accessible I/O signals makes it easy to interface the EVB to external circuits. All
LM3S1968 I/O lines (except those with both JTAG and SWD functions) are brought out to 0.1”
pitch pads. For quick reference, silk-screened labels on the PCB show primary pin functions.
Table B-2 on page 28 has a complete list of I/O signals as well as recommended connectors.
Most LM3S1968 I/O signals are +5-V tolerant. Refer to the LM3S1968 data sheet for detailed
electrical specifications.
Using the In-Circuit Debugger Interface
The Stellaris LM3S1968 Evaluation Kit can operate as an In-Circuit Debugger Interface (ICDI).
ICDI acts as a USB to the JTAG/SWD adaptor, allowing debugging of any external target board
that uses a Stellaris microcontroller. See “Debugging Modes” on page 12 for a description of how
to enter Debug Out mode.
Figure 2-1. ICD Interface Mode
Pin 29 PA3/SSI0FSS OLED display chip select JP5
Pin 37 PG6/PHA1 Right switch JP6
Pin 36 PG7/PHB1 Select switch JP7
Pin 40 PG5 Left switch JP8
Pin 41 PG4 Down switch JP9
Pin 31 PA5/SSI0TX OLED display data in JP10
Pin 28 PA2/SSI0CLK OLED display clock JP11
Pin 34 PA6/I2C1SCL OLED display data/control select JP12
Pin 27 PA1/U0TX Virtual COM port transmit JP13
Pin 86 PH0/PWM2 Sound+ JP14
Pin 85 PH1/PWM3 Sound- JP15
Table 2-2. Isolating On-Board Hardware (Continued)
Microcontroller Pin Microcontroller Assignment To Isolate, Remove...
Evaluation Board
Target
Board
Stellaris
MCU
Target
Cable
`
USB
PC with IDE/
debugger
Stellaris
MCU
TCK/SWCLK bypasses the
on-board microcontroller
JTAG or SWD connects to the
external microcontroller
Connecting Pin 18 to GND sets
external debug mode