https://devzone.nordicsemi.com/f/nordic-q-a/40667/cpu-lockupI&#39;m curious about the CPU lockup reset. We have a long term test with 9 units running identical firmware on identical hardware; line powered, running continuously for 6 months without explicit power management. In that period of time - 4 units haveen-USTelligent Community 13Wed, 28 Nov 2018 16:50:46 GMThttps://devzone.nordicsemi.com/thread/159445?ContentTypeID=1Wed, 28 Nov 2018 16:50:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d24fcae-616a-4df7-b73c-2c3b7ca3d8bdSigurd<p>The only&nbsp;exception where lockup does not trigger a reset is when you are in debug interface mode. The fact that you see the&nbsp;<span>lockup detected&#39; bit set in&nbsp;RESETREAS&nbsp;also indicates that the device did in fact reset.</span></p> [quote userid="23573" url="~/f/nordic-q-a/40667/cpu-lockup"]We haven&#39;t seen any calls to our application app_error_fault_handler() during our long-term test.&nbsp;[/quote] <p>A hardfault would trigger the&nbsp;<span>HardFault_Handler, not the&nbsp;app_error_fault_handler().</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/158250?ContentTypeID=1Tue, 20 Nov 2018 16:16:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3eac4b4c-b574-468c-926d-5efd5b619808Richard D.<p>Interestingly, Section 18.6 describes 6 sources of reset but CPU lockup is not one of the 6 sources. &nbsp;RESETREAS has a &#39;lockup detected&#39; bit, suggesting that a reset occurs upon lockup, but nowhere is it explicitly stated that lockup will always result in a reset - hence my question.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/158077?ContentTypeID=1Mon, 19 Nov 2018 23:33:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:15b440f0-5cdc-4d13-add1-371f7bccdacfTurbo J<p>Unless the debug interface is actively run by a debugger, cpu lockup will automagically cause reset on NRF52832. See Reset chapter (18.6) in the PS.</p><div style="clear:both;"></div>