https://community.nxp.com/t5/Embedded-Software-and-Tools/IMXRT1060-endless-SPI-SCK/m-p/1893836#M499 <P>Using IMXRT1060 we send 16 bits SPI as master and everything works fine. We have a 20 ohm resistor on the SCK signal.</P><P>When we remove the resistor, the NXP does not stop after 16 clocks, but rather keep on until the FIFO's are full.&nbsp;</P><P>We are using the exact same code for both scenarios.</P><P>I am wondering how does a resistor on SCK (which is a master output pin) cause the master to keep on clocking past the transaction boundaries?</P><P>We never touch the CONT/CONTC bits and not using DMA or interrupts.&nbsp;</P><P>Following is an image of a good and bad flow:</P> Tue, 25 Jun 2024 18:48:56 GMT omrif 2024-06-25T18:48:56Z https://community.nxp.com/t5/Embedded-Software-and-Tools/IMXRT1060-endless-SPI-SCK/m-p/1893836#M499 <P>Using IMXRT1060 we send 16 bits SPI as master and everything works fine. We have a 20 ohm resistor on the SCK signal.</P><P>When we remove the resistor, the NXP does not stop after 16 clocks, but rather keep on until the FIFO's are full.&nbsp;</P><P>We are using the exact same code for both scenarios.</P><P>I am wondering how does a resistor on SCK (which is a master output pin) cause the master to keep on clocking past the transaction boundaries?</P><P>We never touch the CONT/CONTC bits and not using DMA or interrupts.&nbsp;</P><P>Following is an image of a good and bad flow:</P> Tue, 25 Jun 2024 18:48:56 GMT https://community.nxp.com/t5/Embedded-Software-and-Tools/IMXRT1060-endless-SPI-SCK/m-p/1893836#M499 omrif 2024-06-25T18:48:56Z