https://devzone.nordicsemi.com/f/nordic-q-a/9202/private-peripheral-bus-documentationI&#39;m trying to track down an intermittent bug in programming our Nordic board. So, I&#39;m having to laboriously reconstruct the SWD transactions and understand them. A transaction that occurs is &quot;D1 OK 0F B7 99 97&quot;. That&#39;s an AP Write access to Addressen-USTelligent Community 13Mon, 14 Sep 2015 05:46:37 GMThttps://devzone.nordicsemi.com/thread/33930?ContentTypeID=1Mon, 14 Sep 2015 05:46:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:879fad80-82af-488f-b2a0-62b3bb9e1624Andrew Lentvorski<p>Thanks for the pointer. Yet another manual to RTFM.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/33929?ContentTypeID=1Mon, 14 Sep 2015 00:33:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9de8a87d-497f-41d4-bffe-1e85acfd9931RK<p>The documentation about that is in the ARMv6M manual, it&#39;s the mandated address for the Debug Control Block, specifically the Debug Halting Control and Status Register. Writes to that are often used to halt the processor as part of the programming process.</p><div style="clear:both;"></div>