topic External clock source setup on LPC11xx in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/External-clock-source-setup-on-LPC11xx/m-p/543874#M12797 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Mesozoic on Thu Oct 31 17:35:54 MST 2013</STRONG><BR /><SPAN>Would someone be kind enough to share how they got their LPC11xx chip to use an external oscillator?&nbsp; I've got an 8 MHz crystal plumbed into the XTAL pins and can see it resonating on the scope, but there's no clear description of how to set it up via the C API.&nbsp; Of course, I don't mind bitbanging either, but I figured I'd at least try to use one or the other exclusively.</SPAN><BR /><BR /><SPAN>I see </SPAN><STRONG>Chip_Clock_SetPLLBypass(true, false);</STRONG><SPAN> as a way of specifying the external clock source usage; I'm assuming my 8 MHz crystal is low frequency, hence the false in the 2nd parameter.</SPAN><BR /><BR /><SPAN>What else needs to be done?&nbsp; A call to </SPAN><STRONG>Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_PLLIN)</STRONG><SPAN>?</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:42:53 GMT lpcware 2016-06-15T19:42:53Z External clock source setup on LPC11xx https://community.nxp.com/t5/LPC-Microcontrollers/External-clock-source-setup-on-LPC11xx/m-p/543874#M12797 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Mesozoic on Thu Oct 31 17:35:54 MST 2013</STRONG><BR /><SPAN>Would someone be kind enough to share how they got their LPC11xx chip to use an external oscillator?&nbsp; I've got an 8 MHz crystal plumbed into the XTAL pins and can see it resonating on the scope, but there's no clear description of how to set it up via the C API.&nbsp; Of course, I don't mind bitbanging either, but I figured I'd at least try to use one or the other exclusively.</SPAN><BR /><BR /><SPAN>I see </SPAN><STRONG>Chip_Clock_SetPLLBypass(true, false);</STRONG><SPAN> as a way of specifying the external clock source usage; I'm assuming my 8 MHz crystal is low frequency, hence the false in the 2nd parameter.</SPAN><BR /><BR /><SPAN>What else needs to be done?&nbsp; A call to </SPAN><STRONG>Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_PLLIN)</STRONG><SPAN>?</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:42:53 GMT https://community.nxp.com/t5/LPC-Microcontrollers/External-clock-source-setup-on-LPC11xx/m-p/543874#M12797 lpcware 2016-06-15T19:42:53Z