https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421046#M24107 <HTML><HEAD></HEAD><BODY><P><SPAN style="color: #1f497d;">I have 2 questions:</SPAN></P><P></P><P><SPAN style="color: #1f497d;">1. Is it possible to replace the 32KHz crystal with a MEMS crystal oscillator for the XTAL32 input for the RTC on this device?</SPAN></P><P><SPAN style="color: #1f497d;">.</SPAN></P><P><SPAN style="color: #1f497d;">2. Does the dryice require the XTAL32 clock to run if we just want the 32bytes of battery ram? </SPAN></P></BODY></HTML> Tue, 02 Jun 2015 22:24:54 GMT PHXFAE 2015-06-02T22:24:54Z https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421046#M24107 <HTML><HEAD></HEAD><BODY><P><SPAN style="color: #1f497d;">I have 2 questions:</SPAN></P><P></P><P><SPAN style="color: #1f497d;">1. Is it possible to replace the 32KHz crystal with a MEMS crystal oscillator for the XTAL32 input for the RTC on this device?</SPAN></P><P><SPAN style="color: #1f497d;">.</SPAN></P><P><SPAN style="color: #1f497d;">2. Does the dryice require the XTAL32 clock to run if we just want the 32bytes of battery ram? </SPAN></P></BODY></HTML> Tue, 02 Jun 2015 22:24:54 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421046#M24107 PHXFAE 2015-06-02T22:24:54Z https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421047#M24108 <HTML><HEAD></HEAD><BODY><P>Hi Alex,</P><P></P><P>1.&nbsp;&nbsp; I think a MEMS crystal oscillator as a external 32KHz clock source (oscillator) should works with RTC module.</P><P>I do a test with TWR-K40X256 board, using external signal generator output 32KHz clock as RTC reference clock input to EXTAL32 pin, and the RTC module works as expected.</P><P>2. The DryICE module clock source from RTC clock source, which still need external 32KHz clock when do any operation with DryICE module.</P><P>Wish it helps.</P><P><BR />Have a great day,<BR />Ma Hui</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 04 Jun 2015 01:42:45 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421047#M24108 Hui_Ma 2015-06-04T01:42:45Z https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421048#M24109 <HTML><HEAD></HEAD><BODY><P>1.&nbsp; Just to be clear, you connected the signal generator to the XTAL32 pin correct, not the EXTAL32 pin?&nbsp; Can you please tell me the signal level you used and the VCC you were using for the K40 board?</P><P></P><P>2. You are saying that the RTC clock MUST be used when doing anything with DryICE, correct? </P><P></P><P>Thx for the help.</P></BODY></HTML> Fri, 05 Jun 2015 17:56:10 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421048#M24109 PHXFAE 2015-06-05T17:56:10Z https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421049#M24110 <HTML><HEAD></HEAD><BODY><P>I'm sorry. but I change the names around on number 1 above.&nbsp; The question should read -.Just to be clear, you connected the signal generator to the EXTAL32 pin correct, not the XTAL32 pin?&nbsp; Can you please tell me the signal level you used and the VCC you were using for the K40 board?</P></BODY></HTML> Fri, 05 Jun 2015 17:58:56 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421049#M24110 PHXFAE 2015-06-05T17:58:56Z https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421050#M24111 <HTML><HEAD></HEAD><BODY><P>1.In fact, I had tested to connect external signal generator 32.768KHz clock to EXTAL32 and XTAL32 separately. The RTC module could work as expected. </P><P>While, for the EXTAL32 pin is input, we suggest customer to connect external clock source to EXTAL32 pin.</P><P></P><P>2. That's right.</P><P><BR />Have a great day,<BR />Ma Hui</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Mon, 08 Jun 2015 00:02:59 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK21-XTAL32-and-Dryice-questions/m-p/421050#M24111 Hui_Ma 2015-06-08T00:02:59Z