https://devzone.nordicsemi.com/f/nordic-q-a/15204/swd-frequencyWhat is the maximum allowable clock speed for the SWD interface of the nRF51822?en-USTelligent Community 13Fri, 24 Mar 2017 14:39:52 GMThttps://devzone.nordicsemi.com/thread/58057?ContentTypeID=1Fri, 24 Mar 2017 14:39:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:090329d4-0ee5-4408-aff0-93627a60b41cpytepaul<p>Hi,</p> <p>Sorry to re-up this old topic.</p> <p>Does this mean that if capacitance is low, short length lines and ideal world we can deal with a 3 MByte/second with suitable J-link probe on NRFx ?</p> <p>Regards, Paul.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/58056?ContentTypeID=1Tue, 19 Jul 2016 06:41:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a19df5b-7bbf-44f8-b5bc-db1809b25fcb&#216;yvind Karlsen<p>Hi,</p> <p>The SWD frequency depends a lot of what kind of programming lines you have, and will be lower if there is a lot of capacitance, difference in lengths etc.</p> <p>The SWD interface speed self regulates, for an indication on what is possible refer to the programming speed of for example <a href="https://www.segger.com/jlink-debug-probes.html">SEGGER programmers</a>.</p> <p>We only specify that the clock speed has to be atleast 125 kHz. See the section in the reference manual on the <a href="http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.pdf">debugger interface</a> for more information.</p> <p>Best regards,</p> <p>Øyvind</p><div style="clear:both;"></div>