https://community.nxp.com/t5/Other-NXP-Products/cannot-communicate-with-SC16IS750-over-SPI/m-p/1197155#M10023 <P>HI</P> <P>Please see comment:</P> <P>1: Please refer to hardware schematic.</P> <P>2:Read the detail SPI specification on datasheet page51 and follow this timing on operate SPI.</P> <P>&nbsp;</P> Thu, 10 Dec 2020 06:59:04 GMT guoweisun 2020-12-10T06:59:04Z https://community.nxp.com/t5/Other-NXP-Products/cannot-communicate-with-SC16IS750-over-SPI/m-p/1196069#M10016 <P>Hi.<BR /><BR />I am currently trying to communicate with SC16IS750 over SPI.<BR />I checked RESET signal was H-level, and CPU sent SPI mode 0 signal as following:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="SPI_waveform.jpg" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/132198i79A3306638C97307/image-size/large?v=v2&amp;px=999" role="button" title="SPI_waveform.jpg" alt="SPI_waveform.jpg" /></span></P><P>This is a waveform on reading RXLVL register at the time of release reset.<BR />I expected to receive 0, but the result was different.</P><P>I additionaly checked:</P><UL><LI>Direct connection (MISO/MOSI/CLK etc)</LI><LI>3.3V power</LI><LI>Reset is released</LI><LI>SPI translation rate is 3.125Mbps</LI></UL><P>Do I have something wrong?</P><P><SPAN>Thanks in advance.</SPAN></P> Wed, 09 Dec 2020 06:48:25 GMT https://community.nxp.com/t5/Other-NXP-Products/cannot-communicate-with-SC16IS750-over-SPI/m-p/1196069#M10016 Nishihashi 2020-12-09T06:48:25Z https://community.nxp.com/t5/Other-NXP-Products/cannot-communicate-with-SC16IS750-over-SPI/m-p/1197155#M10023 <P>HI</P> <P>Please see comment:</P> <P>1: Please refer to hardware schematic.</P> <P>2:Read the detail SPI specification on datasheet page51 and follow this timing on operate SPI.</P> <P>&nbsp;</P> Thu, 10 Dec 2020 06:59:04 GMT https://community.nxp.com/t5/Other-NXP-Products/cannot-communicate-with-SC16IS750-over-SPI/m-p/1197155#M10023 guoweisun 2020-12-10T06:59:04Z