https://devzone.nordicsemi.com/f/nordic-q-a/113821/approtect-mechanisms-on-nrf52840Hi all, I am trying to understand the different Access Port Protection mechanisms on the nRF52840. From several tickets, own experiments and from the data sheet I was able to come up with the following summary: For older revisions &lt;= 2: it is enoughen-USTelligent Community 13Thu, 15 Aug 2024 14:37:45 GMThttps://devzone.nordicsemi.com/thread/498486?ContentTypeID=1Thu, 15 Aug 2024 14:37:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ed7d6002-1782-429d-ad6f-14d9c0d81fc5Sigurd<p>Hi!</p> <p>Looks like you have a good understanding of this. I assume you might have seen these links:</p> <p><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/dif.html?cp=5_0_0_3_7_1#concept_udr_mns_1s">https://infocenter.nordicsemi.com/topic/ps_nrf52840/dif.html?cp=5_0_0_3_7_1#concept_udr_mns_1s</a></p> <p>&nbsp;<a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/working-with-the-nrf52-series-improved-approtect">Working with the nRF52 Series&#39; improved APPROTECT</a>&nbsp;</p> [quote user=""]&nbsp;I am wondering why exclude the soft reset from being a valid type to re-/activate the hardware protection as it was the case older versions?[/quote] <p>Register APPROTECT.DISABLE is reset after pin reset, power or brownout reset, watchdog reset, or wake from System OFF. So this register only reset after a &quot;Hard reset&quot; to allow soft resets while debugging.</p> <p></p><div style="clear:both;"></div>