MCX MicrocontrollersのトピックCannot debug MCXN947

Cannot debug MCXN947

TomC818 — Fri, 11 Jul 2025 06:51:34 GMT

Hello, I have a customized MCXN947 board which both the internal LDO and DCDC have been bypassed. Now I am trying to program the board with Segger JLINK. Using the JLink Commander the host computer can detect and identify the M33 core.

But when I tried to flash any thing to the mcu, the host computer cannot identify the target device.

My board currently have used PCA9420 to provide the power to the VDD_CORE and IOs. I have followed the datasheet and pull the VDD_DCDC low with 10k resistor and left DCDC_LX floated. The VDD_LDO_CORE pin is also shorted to the VDD_CORE.

I have tried both vscode and mcxpressor which both have failed to flash the codes onto the chip. But yet the JLINK can identify the processor core.

Re: Cannot debug MCXN947

Celeste_Liu — Mon, 14 Jul 2025 09:40:04 GMT

Hello @TomC818 ,

Thanks for your post.

I tried using J-Link with the FRDM-MCXN947 board, and there were no issues.

Please refer to our UG10092 and the FRDM board schematic to check your hardware design, with a focus on the power supply and SWD interface.

UG10092: https://www.nxp.com/webapp/Download?colCode=UG10092&location=null&isHTMLorPDF=HTML

Hope it can help you.

BRs,

Celeste

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