https://devzone.nordicsemi.com/f/nordic-q-a/48185/app_pwm-question-maximum-tick-value-is-32000-with-32-768khz-external-lfHi, I&#39;m using app_pwm with 32.768Khz external xtal. the following is my setting in sdk_config.h. // &lt;0=&gt; RC // &lt;1=&gt; XTAL // &lt;2=&gt; Synth #ifndef CLOCK_CONFIG_LF_SRC #define CLOCK_CONFIG_LF_SRC 1 #endif app_pwm_cycle_ticks_get() the above functionen-USTelligent Community 13Tue, 11 Jun 2019 02:42:42 GMThttps://devzone.nordicsemi.com/thread/191901?ContentTypeID=1Tue, 11 Jun 2019 02:42:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5bf846d1-5d3f-46f4-b0a0-547082088680alan.kim<p>Thank you for the answer</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/191653?ContentTypeID=1Fri, 07 Jun 2019 12:28:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:32fecea0-3a50-4af7-895f-07981978715eJared<p>Hi,</p> <p>The PWM library use <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_pwm.html?cp=5_1_3_34">Timer which again use the HFCLK</a>. Changing the LFCLK source should therefore not affect the app_pwm.&nbsp;</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>