S12 / MagniV MicrocontrollersのトピックAbout IPLL https://community.nxp.com/t5/S12-MagniV-Microcontrollers/About-IPLL/m-p/163570#M5238 <HTML><HEAD></HEAD><BODY><P>Hello kef ！</P><P>I am using XET256 ,I have some promblem about IPLL.</P><P>when &nbsp;fOSC=16MHz, I have two plans for count fVCO ,first&nbsp;SYNDIV=4；REFDIV=1 then fVCO=80M; second YNDIV=24 ；REFDIV=7 ,then fVCO=100M,if the first one is better then the second one because there are explains in document "Use lowest possible fVCO/fREF ratio (SYNDIV value). Use highest possible REFCLK frequency fREF". The the second plan unsafe?</P><P>I also want to know how to use FM0 and FM1,and why to use them?&nbsp;</P><P>&nbsp;</P><P><SPAN>Thank you for your</SPAN><SPAN>&nbsp;</SPAN><SPAN>continued support</SPAN><SPAN>.</SPAN></P></BODY></HTML> Wed, 16 May 2012 08:09:25 GMT zy 2012-05-16T08:09:25Z About IPLL https://community.nxp.com/t5/S12-MagniV-Microcontrollers/About-IPLL/m-p/163570#M5238 <HTML><HEAD></HEAD><BODY><P>Hello kef ！</P><P>I am using XET256 ,I have some promblem about IPLL.</P><P>when &nbsp;fOSC=16MHz, I have two plans for count fVCO ,first&nbsp;SYNDIV=4；REFDIV=1 then fVCO=80M; second YNDIV=24 ；REFDIV=7 ,then fVCO=100M,if the first one is better then the second one because there are explains in document "Use lowest possible fVCO/fREF ratio (SYNDIV value). Use highest possible REFCLK frequency fREF". The the second plan unsafe?</P><P>I also want to know how to use FM0 and FM1,and why to use them?&nbsp;</P><P>&nbsp;</P><P><SPAN>Thank you for your</SPAN><SPAN>&nbsp;</SPAN><SPAN>continued support</SPAN><SPAN>.</SPAN></P></BODY></HTML> Wed, 16 May 2012 08:09:25 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/About-IPLL/m-p/163570#M5238 zy 2012-05-16T08:09:25Z Re: About IPLL https://community.nxp.com/t5/S12-MagniV-Microcontrollers/About-IPLL/m-p/163571#M5239 <HTML><HEAD></HEAD><BODY><P>Hello</P><P>&nbsp;</P><P>You should address your questions not only for me, but for whole forums community.</P><P>&nbsp;&nbsp;</P><P>Regarding your question, try using this SW to calculate IPLL settings <A href="http://cache.freescale.com/files/microcontrollers/doc/user_guide/S12XEIPLLCUGSW.zip" rel="nofollow" target="_blank">http://cache.freescale.com/files/microcontrollers/doc/user_guide/S12XEIPLLCUGSW.zip</A></P><P>&nbsp;</P><P>Enabling frequency modulation may help passing EMI tests. Google for spread spectrum modulation.</P></BODY></HTML> Wed, 16 May 2012 11:02:59 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/About-IPLL/m-p/163571#M5239 kef 2012-05-16T11:02:59Z Re: About IPLL https://community.nxp.com/t5/S12-MagniV-Microcontrollers/About-IPLL/m-p/163572#M5240 <HTML><HEAD></HEAD><BODY><P>Thank you very much</P></BODY></HTML> Thu, 17 May 2012 07:22:43 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/About-IPLL/m-p/163572#M5240 zy 2012-05-17T07:22:43Z