I tried to use J-LInk EDU to debug Arduino Nano 33 Ble sense board. Using Keil MDK, I set up the "Device" as NRF52840_xxAA and use the real debugger J-Link EDU. But the problem is that during debugging, the event counters, like CPICNT and LSUCNT, will overflow. I have checked the debugger configuration again and again but could not figure out where the problem is. The following is the configuration screenshot for J-Link EDU.
![](https://forum.segger.com/index.php/Attachment/4814-NRF52840-JLINKedu-png/?s=3f6bd1faa792bba50f5272923d534dc537de4541)
[SOLVED] J-Link EDU for Arduino Nano 33 Ble sense using Keil MDK
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