topic Re: Do Kinetis K22 has internal pullups on the SDHC peripheral lines? in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322257#M14545 <HTML><HEAD></HEAD><BODY><P>Pasquale</P><P></P><P>You can decide whether pull-ups are enabled or not when configuring each pin. See PORTn_PCRx register.</P><P>The pull-up resistors will have a wider tolerance spread than external ones though.</P><P></P><P>Regards</P><P></P><P>Mark</P></BODY></HTML> Fri, 18 Jul 2014 15:59:43 GMT mjbcswitzerland 2014-07-18T15:59:43Z Do Kinetis K22 has internal pullups on the SDHC peripheral lines? https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322256#M14544 <HTML><HEAD></HEAD><BODY><P>Or i need to put them external?<BR />Thanks,</P><P>Pasquale</P></BODY></HTML> Fri, 18 Jul 2014 15:51:49 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322256#M14544 pasqualelongo 2014-07-18T15:51:49Z Re: Do Kinetis K22 has internal pullups on the SDHC peripheral lines? https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322257#M14545 <HTML><HEAD></HEAD><BODY><P>Pasquale</P><P></P><P>You can decide whether pull-ups are enabled or not when configuring each pin. See PORTn_PCRx register.</P><P>The pull-up resistors will have a wider tolerance spread than external ones though.</P><P></P><P>Regards</P><P></P><P>Mark</P></BODY></HTML> Fri, 18 Jul 2014 15:59:43 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322257#M14545 mjbcswitzerland 2014-07-18T15:59:43Z Re: Do Kinetis K22 has internal pullups on the SDHC peripheral lines? https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322258#M14546 <HTML><HEAD></HEAD><BODY><P>Hi, Longo</P><P>I agree with Mark. It is better to add external pull-up resistor. The internal resistor is a weak pull-up. So you need add a strong pull-up external to ensure communication is good on no good layout condition. Hope my reply can help you.</P><P></P><P>Best Regards</P><P>Paul</P></BODY></HTML> Mon, 21 Jul 2014 06:43:37 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322258#M14546 Paul_Tian 2014-07-21T06:43:37Z Re: Do Kinetis K22 has internal pullups on the SDHC peripheral lines? https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322259#M14547 <HTML><HEAD></HEAD><BODY><P>Thanks Mark and Paul,</P><P>I'll perform some tests using internal pullups, if i'll found problems i'll install external.</P><P>Will keep you updated</P><P>Pasquale</P></BODY></HTML> Mon, 21 Jul 2014 07:22:05 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Do-Kinetis-K22-has-internal-pullups-on-the-SDHC-peripheral-lines/m-p/322259#M14547 pasqualelongo 2014-07-21T07:22:05Z