Datasheet

NXP Semiconductors
UM11121
LPCXpresso51U68
UM11121
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© NXP Semiconductors N.V. 2018. All rights reserved.
User manual
Rev 1.1 — 27 April 27, 2018
8 of 22
3. Getting Started
By default, the LPCXpresso51U68 is configured to use the on-board debug probe (Link2)
to debug the on-board target (LPC51U68), using the CMSIS-DAP debug protocol pre-
programmed into the Link2 Flash memory. The MCUXpresso IDE (available for free
download at http://www.nxp.com/mcuxpressoide) or development tools that support the
CMSIS-DAP protocol can be used in the default configuration. Check with your toolchain
vendor for availability of specific device support packs for the LPC54110 family of
devices.
Note that when using the MCUXpresso IDE, the on-board Link2 can also be booted in
DFU mode by installing a jumper on JP5; if this is done then the IDE will download
CMSIS-DAP to the probe as needed. Using DFU boot mode will ensure that the most up-
to-date / compatible firmware image is used with the IDE. Note that spare jumpers are
provided in the board packaging, taped to the card insert beneath the board.
3.1 Starting a debug session using the on-board (Link2) Debug Probe
By default, the LPCXpresso51U68 is configured to use the on-board Debug Probe
(Link2) to debug the on-board target, using the CMSIS-DAP debug protocol pre-
programmed into the Link2 Flash memory. The MCUXpresso IDE or other development
tools that support the CMSIS-DAP protocol can be used in the default configuration.
Check with your toolchain vendor for availability of specific device support packs for
LPC51U68 devices (also see Section 3.1.2 for details when using IAR EWARM or Keil
MDK.)
Note that when using the MCUXpresso IDE, the on-board Link2 can also be booted in
DFU mode by installing a jumper on JP5; if this is done then the IDE will download
CMSIS-DAP to the probe as needed. Using DFU boot mode will ensure that the most up-
to-date / compatible firmware image is used with the MCUXpresso IDE. Note that spare
jumpers are provided in the board packaging.
NOTE: if the Debug Probe is set up to boot in DFU mode, the USB bridge functions
(virtual comm port) and Debug Probe features will not be available if the board is not first
initialized by the MCUXpresso IDE.
Installation steps for use with MCUXpresso IDE
1. Download and install the MCUXpresso IDE (version 10.1 or later.)
2. Configure and download an SDK package (with the MCUXpresso IDE tool chain
option selected) from the MCUXpresso SDK Builder utility
(http://mcuxpresso.nxp.com).
3. Recommended: Install JP7 to force the Link2 Debug Probe to boot in DFU mode
(see notes above).
4. Ensure jumper JP2 is fitted in position 1-2 (local target powered), and JP1 is not
installed (target SWD enabled). These are the default positions set during board
manufacture.
5. Connect the LPCXpresso51U68 board to the USB port of your host computer,
connecting a micro USB cable to connector J7 (“Link”). The board will boot and run
the pre-installed demo (user RGB LED blinks).