LPC845,how to use external crystal as the chip clock source?

[Roger_WANG_2022]

I use the LPC845-Example-Code-Bundle-IAR code to test my board. when I try to use 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.

[jeremyzhou · Accepted solution]

Hi Roger Wang,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
I'd highly recommend you to use the MCUXpresso Config 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.

TIC

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