https://devzone.nordicsemi.com/f/nordic-q-a/29979/app-timer-no-runHi， I work on thiny52，when i cut off softdevice ，modify the ld file to： MEMORY { FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x80000 RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x10000 } It can&#39;t enter the app timer handler. and app_timer_cnt_get(en-USTelligent Community 13Wed, 31 Jan 2018 01:03:02 GMThttps://devzone.nordicsemi.com/thread/119202?ContentTypeID=1Wed, 31 Jan 2018 01:03:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a553661-2662-43f4-a1cd-19e52e2139aefreedom118<p>Dear Jorgen，</p> <pre><code> Problem solved， thank you！ </code></pre><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/119201?ContentTypeID=1Tue, 30 Jan 2018 09:54:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0a117022-88e2-4120-9379-4b7138ce1050J&#248;rgen Holmefjord<p>Hi,</p> <p>Have you started the LFCLK before starting the application timer? When the softdevice is enabled it will handle the clock for you, but when you have disabled it you need to start the clock yourself. Please have a look at the <a href="https://devzone.nordicsemi.com/tutorials/19/">application timer tutorial</a>.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>