S32KのトピックRe: How to switch S32K RTC clock source to external crystal oscillator? https://community.nxp.com/t5/S32K/How-to-switch-S32K-RTC-clock-source-to-external-crystal/m-p/741526#M1986 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>The LPOCLKS register is a write-once register which is reset only on POR or LVD (Section 10.3.1.4, RM rev. 6).</P><P></P><P>Regards,</P><P>Daniel&nbsp;</P></BODY></HTML> Tue, 27 Mar 2018 10:51:32 GMT danielmartynek 2018-03-27T10:51:32Z How to switch S32K RTC clock source to external crystal oscillator? https://community.nxp.com/t5/S32K/How-to-switch-S32K-RTC-clock-source-to-external-crystal/m-p/741525#M1985 <HTML><HEAD></HEAD><BODY><P>Hi, Now i have a problem ,In order to ensure the&nbsp;accurancy of RTC, I&nbsp;'ve used a&nbsp;crystal oscillator of 32.768KHZ which connected to RTC_CLKIN Pin, What puzzle me is no matter&nbsp;what i do to configure the clock ,it turned&nbsp;to be&nbsp; RTC still use the LPO Clock,I don't know why ,Can somebody give me some tips ? Thanks a lot.</P><P></P><P>My Configuration as below.</P><P></P><P>1.</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/18992iD609242498EDBFE5/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>2.</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/19037i627F4277609FDF04/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P><P>3.</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_3.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/19074iF6F4A0FF5C369D91/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_3.png" alt="pastedImage_3.png" /></span></P><P></P><P>4.In addition,I have configured the PA7's mux mode to&nbsp;PORT_MUX_ALT4 for Enabling&nbsp;RTC CLK_IN.</P></BODY></HTML> Tue, 27 Mar 2018 10:29:09 GMT https://community.nxp.com/t5/S32K/How-to-switch-S32K-RTC-clock-source-to-external-crystal/m-p/741525#M1985 kawadaxi 2018-03-27T10:29:09Z Re: How to switch S32K RTC clock source to external crystal oscillator? https://community.nxp.com/t5/S32K/How-to-switch-S32K-RTC-clock-source-to-external-crystal/m-p/741526#M1986 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>The LPOCLKS register is a write-once register which is reset only on POR or LVD (Section 10.3.1.4, RM rev. 6).</P><P></P><P>Regards,</P><P>Daniel&nbsp;</P></BODY></HTML> Tue, 27 Mar 2018 10:51:32 GMT https://community.nxp.com/t5/S32K/How-to-switch-S32K-RTC-clock-source-to-external-crystal/m-p/741526#M1986 danielmartynek 2018-03-27T10:51:32Z