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CPU lock-up detected

Dear Sir,

I used nRF51822, I found sometime the program reset itselft. Then I made a test program to send out the "RESET REASON"by BLE message. I found the reset reason = 0x1000C. refer to "AIRCR.SYSRESETREQ"& "CPU lock-up" detected.

I want to know what is the reason cause "CPU lock-up" & "AIRCR.SYSRESETREQ"?

Thanks & kind regards kwan

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