topic Re: LPC845,how to use external crystal as the chip clock source? in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC845-how-to-use-external-crystal-as-the-chip-clock-source/m-p/1030080#M40100 <HTML><HEAD></HEAD><BODY><P>Hi <A _jive_internal="true" data-content-finding="Community" data-userid="314092" data-username="wangguoyun" href="https://community.nxp.com/people/wangguoyun">Roger Wang</A>,</P><P>Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.<BR />I'd highly recommend you to use the<A href="https://www.nxp.com/design/software/development-software/mcuxpresso-software-and-tools/mcuxpresso-config-tools-pins-clocks-peripherals:MCUXpresso-Config-Tools"> MCUXpresso Config</A> Tools to configure the clock, the tool provides a GUI allows developers to quickly build a custom clock and generate initialization C code for a custom board, so please give a try.</P><P>TIC</P><P style="min- padding: 0px;">&nbsp;</P><P>-------------------------------------------------------------------------------<BR />Note:<BR />- If this post answers your question, please click the "Mark Correct" button. Thank you!</P><P style="min- padding: 0px;">&nbsp;</P><P>- We are following threads for 7 weeks after the last post, later replies are ignored<BR /> Please open a new thread and refer to the closed one, if you have a related question at a later point in time.<BR />-------------------------------------------------------------------------------</P></BODY></HTML> Sun, 19 Jan 2020 09:50:12 GMT jeremyzhou 2020-01-19T09:50:12Z LPC845,how to use external crystal as the chip clock source? https://community.nxp.com/t5/LPC-Microcontrollers/LPC845-how-to-use-external-crystal-as-the-chip-clock-source/m-p/1030079#M40099 <HTML><HEAD></HEAD><BODY><P>I use the LPC845-Example-Code-Bundle-IAR code to test my board. when I try to use&nbsp;SystemInit() (system.c)to initialize my system clock. some definitions was chip_setup.h. My question is how to config these. For example, I want to use 12M external crystal as clock source, and get 30Mhz.</P></BODY></HTML> Sun, 19 Jan 2020 07:18:06 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC845-how-to-use-external-crystal-as-the-chip-clock-source/m-p/1030079#M40099 Roger_WANG_2022 2020-01-19T07:18:06Z Re: LPC845,how to use external crystal as the chip clock source? https://community.nxp.com/t5/LPC-Microcontrollers/LPC845-how-to-use-external-crystal-as-the-chip-clock-source/m-p/1030080#M40100 <HTML><HEAD></HEAD><BODY><P>Hi <A _jive_internal="true" data-content-finding="Community" data-userid="314092" data-username="wangguoyun" href="https://community.nxp.com/people/wangguoyun">Roger Wang</A>,</P><P>Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.<BR />I'd highly recommend you to use the<A href="https://www.nxp.com/design/software/development-software/mcuxpresso-software-and-tools/mcuxpresso-config-tools-pins-clocks-peripherals:MCUXpresso-Config-Tools"> MCUXpresso Config</A> Tools to configure the clock, the tool provides a GUI allows developers to quickly build a custom clock and generate initialization C code for a custom board, so please give a try.</P><P>TIC</P><P style="min- padding: 0px;">&nbsp;</P><P>-------------------------------------------------------------------------------<BR />Note:<BR />- If this post answers your question, please click the "Mark Correct" button. Thank you!</P><P style="min- padding: 0px;">&nbsp;</P><P>- We are following threads for 7 weeks after the last post, later replies are ignored<BR /> Please open a new thread and refer to the closed one, if you have a related question at a later point in time.<BR />-------------------------------------------------------------------------------</P></BODY></HTML> Sun, 19 Jan 2020 09:50:12 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC845-how-to-use-external-crystal-as-the-chip-clock-source/m-p/1030080#M40100 jeremyzhou 2020-01-19T09:50:12Z