Texas Instruments Stellaris LM3S6965, User Manual, Page: 16 / 27

Hardware Description
16 January 6, 2010
Most LM3S6965 I/O signals are +5-V tolerant. Refer to the LM3S6965 data sheet for detailed
electrical specifications.
Using the In-Circuit Debugger Interface
The Stellaris LM3S6965 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
The debug interface operates in either Serial-Wire Debug (SWD) or full JTAG mode, depending on
the configuration in the debugger IDE.
The IDE/debugger does not distinguish between the on-EVB Stellaris microcontroller and an
external Stellaris microcontroller. The only requirement is that the correct Stellaris device is
selected in the project configuration.
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