https://devzone.nordicsemi.com/f/nordic-q-a/71294/spim3-mosiSPIM3配置，MOSI--P0.2，MISO--P0.28，SCK--P1.6，SS--P1.4，时钟频率125K，MODE0模式 如图，绿色为时钟，黄色为MOSI，在一个字节数据传输结束后，MOSI引脚引脚电平缓慢下降的状态，是否正常？期间更换其他引脚测试，均如此。en-USTelligent Community 13Fri, 05 Feb 2021 00:05:30 GMThttps://devzone.nordicsemi.com/thread/293005?ContentTypeID=1Fri, 05 Feb 2021 00:05:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:684010ec-5031-4c0e-ba78-b4e4f666f339chenzp531<p>非常感谢！！！</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/292943?ContentTypeID=1Thu, 04 Feb 2021 14:06:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fd6ae1e6-118f-4c4f-9cf5-883a08907574SmallerPond<p>I believe it is the small amount of pin capacitance coupled with the very high impedance you see at both ends of the connection.&nbsp; You could probably put a very weak (100k?) pull down if it bothers you or you need it to drop faster, but the push-pull will pull it do it for you when it comes time to load up the next bit.</p> <p></p> <p>For reference: 5pF pin/line capacitance (low estimate since pad capacitance is already ~4pF) with 100MOhm impedance (also probably low estimate) would mean ~= 0.5ms time constant.&nbsp; So this is about in line with what we see.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/292803?ContentTypeID=1Thu, 04 Feb 2021 06:14:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:656bda32-a4db-41c1-969f-cbf7e8bec539chenzp531<p>那请问为什么会这样？</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/292795?ContentTypeID=1Thu, 04 Feb 2021 04:02:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:46468482-7c8c-4987-ba14-421504da378bSmallerPond<p>Yes, perfectly normal:</p> <p><img alt=" " src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/3326.SDS00001.BMP" /></p><div style="clear:both;"></div>