https://devzone.nordicsemi.com/f/nordic-q-a/2498/read-adc-in-active-event-nrf51822Hi, Today I use the app timer to start a simple 8bit ADC conversion each second and send in the irq handler. Now I am trying to use the sw interrupt to execute some code (ADC) prior to SoftDevice110 radio send/recv to avoid needing to startup theen-USTelligent Community 13Thu, 15 May 2014 12:49:42 GMThttps://devzone.nordicsemi.com/thread/10031?ContentTypeID=1Thu, 15 May 2014 12:49:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6dc72cd3-5971-4907-a7a8-ed312ea6f257Hung Bui<p>Hi Martin,</p> <p>I think it&#39;s not a bad idea. But if the ADC sampling interval is only 1 every second, you would not save much. Secondly, I think it&#39;s better to start the ADC on nACTIVE event, instead of ACTIVE event. Doing this you can avoid the T_prep period that we are not certain when exactly the 16MHz clock is started.</p> <p>As far as I understand the 16MHz clock is turned off only after the device enter sleep mode after radio event. So more likely you still can have the 16MHz crystal on nACTIVE event.</p><div style="clear:both;"></div>