https://community.nxp.com/t5/Kinetis-Microcontrollers/K70-SPI-with-CPOL1/m-p/1459517#M63115 <P>I'm utilizing the K70 processor with MQX 4.1 and SPI2.&nbsp; &nbsp;I would like the system to operate with the clock idling HIGH, but it doesn't appear to stay high.&nbsp; &nbsp; The SPI2_CTAR0 is properly set to 0x3ecd707a to select my baud rate and SPI mode 3 accordingly.. but the SCLK line only stays high while the SS line is active.. When it's released the SCLK returns low.&nbsp; &nbsp;An then 23ns before the SS line goes LOW the clock is initialized high again.&nbsp; &nbsp;I realize that you could use the SPI2 line for multiple systems and that possibly the clock polarity would change between each SPI transaction, but I would like the Clock line to stay high inbetween SPI transactions.. Is there anyway to accomplish that?&nbsp;</P> Tue, 17 May 2022 19:41:16 GMT Ali2006 2022-05-17T19:41:16Z https://community.nxp.com/t5/Kinetis-Microcontrollers/K70-SPI-with-CPOL1/m-p/1459517#M63115 <P>I'm utilizing the K70 processor with MQX 4.1 and SPI2.&nbsp; &nbsp;I would like the system to operate with the clock idling HIGH, but it doesn't appear to stay high.&nbsp; &nbsp; The SPI2_CTAR0 is properly set to 0x3ecd707a to select my baud rate and SPI mode 3 accordingly.. but the SCLK line only stays high while the SS line is active.. When it's released the SCLK returns low.&nbsp; &nbsp;An then 23ns before the SS line goes LOW the clock is initialized high again.&nbsp; &nbsp;I realize that you could use the SPI2 line for multiple systems and that possibly the clock polarity would change between each SPI transaction, but I would like the Clock line to stay high inbetween SPI transactions.. Is there anyway to accomplish that?&nbsp;</P> Tue, 17 May 2022 19:41:16 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/K70-SPI-with-CPOL1/m-p/1459517#M63115 Ali2006 2022-05-17T19:41:16Z https://community.nxp.com/t5/Kinetis-Microcontrollers/K70-SPI-with-CPOL1/m-p/1470127#M63266 <P>Hello,</P> <P>I think you are misunderstanding the CPOL, the inactive state [IDLE] value of SCK low is 0, in this configuration when you send a frame the SCL must be going high, is this what you need it? if yes try this configuration if you need more information please let me know.</P> <P>Best regards,<BR />Pavel&nbsp;&nbsp;</P> Tue, 07 Jun 2022 17:25:28 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/K70-SPI-with-CPOL1/m-p/1470127#M63266 Pavel_Hernandez 2022-06-07T17:25:28Z