https://devzone.nordicsemi.com/f/nordic-q-a/66511/prescalar-register-in-nrf52840-dkA newbie here. I am studying the simple_timer application in the nRF5_SDK_17.0.0_9d13099 library. The sample application sets the clock frequency to the timer at 16MHz. This is done by writing to the PRESCALAR register as can be seen in nrf_timer.hen-USTelligent Community 13Wed, 30 Sep 2020 08:39:32 GMThttps://devzone.nordicsemi.com/thread/272201?ContentTypeID=1Wed, 30 Sep 2020 08:39:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de08de8a-fc08-46fc-ad61-763cbf91c681haakonsh<p>1)&nbsp;<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/timer.html?cp=4_0_0_5_29">TIMER — Timer/counter</a>.</p> <p>2)Also found in&nbsp;<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/timer.html?cp=4_0_0_5_29">TIMER — Timer/counter</a>.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/272200?ContentTypeID=1Wed, 30 Sep 2020 08:29:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5d63fbd1-c48c-4f45-89ad-a2ec24376fd6Himanshu<p>Dear Haakonsh,</p> <p>Thanks for your reply. However it is only the part reply to the information I am looking for.</p> <p>1) It seems that PRESCALAR registers also selects the frequency clock to the timer; Am I right in assuming this. If yes then where can I find this information in the product specification document.</p> <p>2) If PRESCALAR register only sets the prescalar and not the clock frequency, can you please tell me how is a clock source selected for a given timer.</p> <p>I get a feeling that nRF52840_PS_v1.1.pdf document is build upon another document. ( Just get a feeling there is more to it). Can you please dispel my doubts?</p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/272185?ContentTypeID=1Wed, 30 Sep 2020 07:28:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f1ca72d7-8087-415c-b9ba-7dc35e84d0f4haakonsh<p>A prescaler is usually a cascaded division by 2, where the prescaler value is the number of times the original clock frequency has been divided by 2.&nbsp;<br /><br />Prescaled frequency = Original frequency / 2^PRESCALER</p><div style="clear:both;"></div>