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

Question asked by Roger Wang on Jan 19, 2020
Latest reply on Jan 19, 2020 by jeremyzhou

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.