SPIS appears to keep clock active while idlehttps://devzone.nordicsemi.com/f/nordic-q-a/48970/spis-appears-to-keep-clock-active-while-idleI have been tearing my hair over a really odd behaviour... We are using an nRF52811 based module that interfaces with another microcontroller via SPI. The 52811 is the SPI slave in the setup, and the microcontroller sends data about once per second. en-USTelligent Community 13Wed, 26 Jun 2019 12:51:40 GMTRE: SPIS appears to keep clock active while idlehttps://devzone.nordicsemi.com/thread/194883?ContentTypeID=1Wed, 26 Jun 2019 12:51:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9b57d20b-9990-46d7-ac0d-f5edec8006b8Einar Thorsrud<p>Hi,</p> <p>Can you try to toggle the power register after disabling the SPIS peripheral?</p> <p>You can use the followign code if you are using SPIS0:</p> <p><pre class="ui-code" data-mode="c_cpp">*(volatile uint32_t *)0x40004FFC = 0; *(volatile uint32_t *)0x40004FFC; *(volatile uint32_t *)0x40004FFC = 1;</pre></p> <p>And this if you are using SPIS1:</p> <p><pre class="ui-code" data-mode="c_cpp">*(volatile uint32_t *)0x40003FFC = 0; *(volatile uint32_t *)0x40003FFC; *(volatile uint32_t *)0x40003FFC = 1;</pre></p><div style="clear:both;"></div>RE: SPIS appears to keep clock active while idlehttps://devzone.nordicsemi.com/thread/194657?ContentTypeID=1Tue, 25 Jun 2019 12:47:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:84530246-c2f9-45b1-91bd-30afe5838502umisef<p>(Additional experimentation:)<br />Turns out that even turning on the UART mere milliseconds before the SPI transaction (using the RTC1 for timing), and turning it off in the SPI interrupt handler, will make the SPIS clock behaviour as expected. Turning on and off TIMER1, on the other hand, does not.</p><div style="clear:both;"></div>