When power on,run app first at 0x1f000,then reset and run to boot loader,how to set UICR registers?https://devzone.nordicsemi.com/f/nordic-q-a/21831/when-power-on-run-app-first-at-0x1f000-then-reset-and-run-to-boot-loader-how-to-set-uicr-registersWhen power on,run app first at 0x1f000,then reset and run to boot loader at 0x78000,how to set UICR registers to make this come true?I try to set the NRF_UICR-&gt;NRFFW[0] in the app and then NVIC_SystemReset(),it doesn&#39;t work.How can I set the start addren-USTelligent Community 13Fri, 05 May 2017 12:21:59 GMTRE: When power on,run app first at 0x1f000,then reset and run to boot loader,how to set UICR registers?https://devzone.nordicsemi.com/thread/85744?ContentTypeID=1Fri, 05 May 2017 12:21:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:575b3dbe-6376-4846-9b92-7d47c98a0dabHung Bui<p>@sheep: we can continue discussion on the other case you created <a href="https://devzone.nordicsemi.com/question/133544/how-to-set-bootloader-run-first-in-my-application/">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>RE: When power on,run app first at 0x1f000,then reset and run to boot loader,how to set UICR registers?https://devzone.nordicsemi.com/thread/85743?ContentTypeID=1Fri, 05 May 2017 08:20:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:54b2340b-4b64-4097-b1ae-cc899fd06e80Susheel Nuguru<p>When Cortex M4 in nRF52 is powered on, it always first executes the reset handler whose address is located at memory location 0x04. You need to have a reset handler that does the jump for you.</p> <p>Normally softdevice does this for you. It jumps to the application start address that it expects to start right after its end address. Are you not using softdevice?</p> <p>Setting NRF_UICR-&gt;NRFFW[0] will not do anything in itself. It is just a reserved persistant memory for applications. You can use it like a general purpose UICR memory.</p><div style="clear:both;"></div>