topic Re: Must USB clock source be 48MHz clock on USB-KW24D512? in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Must-USB-clock-source-be-48MHz-clock-on-USB-KW24D512/m-p/494172#M30617 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>No, you can not do that. The USB clock should be 48MHz and as I had mentioned that we do not recommend to use FLL to clock the USB.</P></BODY></HTML> Wed, 23 Mar 2016 08:03:21 GMT miduo 2016-03-23T08:03:21Z Must USB clock source be 48MHz clock on USB-KW24D512? https://community.nxp.com/t5/Kinetis-Microcontrollers/Must-USB-clock-source-be-48MHz-clock-on-USB-KW24D512/m-p/494171#M30616 <HTML><HEAD></HEAD><BODY><P><BR />Can this 20~25MHz clock after start-up be used for driving USB driver?</P><P>If 20~25MHz is not large enough, can we scale the clock to 48MHz via configuring MCG_C4, but still keep running in FEI mode?</P></BODY></HTML> Tue, 22 Mar 2016 02:47:39 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Must-USB-clock-source-be-48MHz-clock-on-USB-KW24D512/m-p/494171#M30616 luwan 2016-03-22T02:47:39Z Re: Must USB clock source be 48MHz clock on USB-KW24D512? https://community.nxp.com/t5/Kinetis-Microcontrollers/Must-USB-clock-source-be-48MHz-clock-on-USB-KW24D512/m-p/494172#M30617 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>No, you can not do that. The USB clock should be 48MHz and as I had mentioned that we do not recommend to use FLL to clock the USB.</P></BODY></HTML> Wed, 23 Mar 2016 08:03:21 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Must-USB-clock-source-be-48MHz-clock-on-USB-KW24D512/m-p/494172#M30617 miduo 2016-03-23T08:03:21Z