https://devzone.nordicsemi.com/f/nordic-q-a/795/32-bit-timer-has-apparent-non-linearityHi, I&#39;ve created a small test program (pasted below) that is intended to help me profile some of my code down to us resolution. Maybe you can quickly run it (no other files needed) to see if you also get what I do. While it works very well at shorten-USTelligent Community 13Thu, 31 Oct 2013 17:45:12 GMThttps://devzone.nordicsemi.com/thread/3983?ContentTypeID=1Thu, 31 Oct 2013 17:45:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:25bc55c4-2294-43da-99c1-00601d9b7780Jamie<p>Makes sense. Thanks, Ole.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/3982?ContentTypeID=1Thu, 31 Oct 2013 09:30:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9dd94157-1902-4900-84a3-066c0d3824fcOle Morten<p>Have you seen item 32 in the <a href="https://www.nordicsemi.com/eng/content/download/29490/494569/file/nRF51822-PAN%20v2.0.pdf">PAN</a>? BITMODE is unfortunately not functional on first revision chips, which means that even though you set your timer to 32-bit mode, you&#39;ll still only get a 24-bit timer. Even though I haven&#39;t tried to run your code, I&#39;m quite confident that&#39;s the cause of your problem, since a 24-bit timer have a rollover at 16.77 seconds.</p><div style="clear:both;"></div>