https://community.nxp.com/t5/MPC5xxx/How-to-use-eMIOS-OPWFMB-mode/m-p/673661#M7874 <HTML><HEAD></HEAD><BODY><P>I am using MPC5746C micro controller for my project development. I am referring MPC5746C reference manual and AN4830 application note. Please refer attached file for application note.</P><P>In section 2.9 various mode of eMIOS has been configured like MCB, OPWFMB, OPWMB, IPM, IPWM etc.&nbsp;</P><P></P><P>I am not able understand how to counter value 2K comes? How to calculate register value of A and B can be configured as two time duty cycle is mentioned there?</P></BODY></HTML> Fri, 02 Jun 2017 12:17:50 GMT atuldixit 2017-06-02T12:17:50Z https://community.nxp.com/t5/MPC5xxx/How-to-use-eMIOS-OPWFMB-mode/m-p/673661#M7874 <HTML><HEAD></HEAD><BODY><P>I am using MPC5746C micro controller for my project development. I am referring MPC5746C reference manual and AN4830 application note. Please refer attached file for application note.</P><P>In section 2.9 various mode of eMIOS has been configured like MCB, OPWFMB, OPWMB, IPM, IPWM etc.&nbsp;</P><P></P><P>I am not able understand how to counter value 2K comes? How to calculate register value of A and B can be configured as two time duty cycle is mentioned there?</P></BODY></HTML> Fri, 02 Jun 2017 12:17:50 GMT https://community.nxp.com/t5/MPC5xxx/How-to-use-eMIOS-OPWFMB-mode/m-p/673661#M7874 atuldixit 2017-06-02T12:17:50Z https://community.nxp.com/t5/MPC5xxx/How-to-use-eMIOS-OPWFMB-mode/m-p/673662#M7875 <HTML><HEAD></HEAD><BODY><P>Hi Atul,</P><P></P><P>The basic description is wrong.</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/21115iB633515B51E855F7/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P><P>And does not correspond with a real implementation</P><P>&nbsp;<span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/21154iD5E1B86CCF76129D/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P><P>&nbsp;<span class="lia-inline-image-display-wrapper" image-alt="pastedImage_3.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/21196i619575C225AE1B83/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_3.png" alt="pastedImage_3.png" /></span></P><P>&nbsp;<span class="lia-inline-image-display-wrapper" image-alt="pastedImage_4.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/21245i7EED8CF86DDE16C0/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_4.png" alt="pastedImage_4.png" /></span></P><P>&nbsp;</P><P>In OPWFMB mode B register is used to set the PWM frequency and A register to set duty cycle.</P><P>Thus for above code</P><P>Period = B * (UCPRE + 1) / channel clock = 200 * 1 / 1MHz = 200us ~ 5kHz</P><P>Pulse width = A * (UCPRE + 1) / channel clock = 20 us</P><P></P><P>BR, Petr</P></BODY></HTML> Thu, 15 Jun 2017 09:44:32 GMT https://community.nxp.com/t5/MPC5xxx/How-to-use-eMIOS-OPWFMB-mode/m-p/673662#M7875 PetrS 2017-06-15T09:44:32Z