NXP Semiconductors
UM12018
FRDM-MCXN947 Board User Manual
On the FRDM-MCXN947 board, MCU-Link is also connected to the P0_[17:16] pins of the target MCU using the
FC2 I2C interface connection through zero-ohm resistors (DNP by default). Populating these resistors enables
the communication between MCU-Link and the target MCU through the USB-to-I2C bridge.
A USB-to-I2C bridge can be used to emulate the host system / board peripherals. To use MCU-Link as a USB-
to-I2C bridge, the board must be connected to the host computer through a USB cable from its J17 connector.
Also, ensure the following resistor configuration on the board to enable the USBSIO bridge feature for I2C:
• Zero-ohm resistors R142 and R143 are populated
• Resistor R121 is DNP (default setting)
• 2.2 kΩ resistors R140 and R141 should be populated
3.10 MCU-Link status LEDs
The FRDM-MCXN947 board has three status indicator LEDs for MCU-Link. Table 29 lists these LEDs and
describes how each LED behaves in different MCU-Link modes. These LEDs are shown in Figure 3.
MCU-Link modePart
identifier
LED name /
color
Normal mode (with CMSIS-DAP
firmware)
Normal mode (with J-
Link firmware)
Firmware update (ISP)
mode
D10 USB COMM /
green
Lights up after successful USB
enumeration at startup. Afterward,
the LED stays ON.
Remains OFF Remains OFF
D11 Status / red Indicates heartbeat (fades in/out
repeatedly), with SWD activity
overlaid.
The LED blinks rapidly at startup,
if an error occurs.
Remains OFF Lights up when MCU-Link
target (LPC55S69) boots
in ISP mode
D12 VCOM ACT /
green
Indicates if VCOM port is
transmitting/receiving data
Lights up when MCU-Link
boots, and blinks when
debug activity happens
Remains OFF
Table 29. MCU-Link LEDs
4 Related documentation
Table 30 lists and explains the additional documents and resources that you can refer to for more information on
the FRDM-MCXN947 board. Some of the documents listed below may be available only under a non-disclosure
agreement (NDA). To request access to these documents, contact your local field applications engineer (FAE)
or sales representative.
Document Description Link / how to access
MCX N94x, N54x Product Family Data Sheet It provides information about electrical
characteristics, hardware design
considerations, and ordering information
MCXNx4x.pdf
MCX Nx4x Reference Manual It is intended for the board-level product
designers and product software developers
who want to develop products with MCX Nx4x
MCU
MCXNx4xRM.pdf
MCX Nx4x Chip Errata (MCXNx4x_xP02G) Lists the details of all known silicon errata for
the MCX Nx4x device.
Contact NXP FAE or
sales representative
Table 30. Related documentation
UM12018 All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved.
User manual Rev. 1 — 20 January 2024
36 / 41
To Next Page
Loading...
