Hi,
Thank you for your interest in NXP Semiconductor products and
the opportunity to serve you.
To provide the fastest possible support, I'd highly recommend you to refer to the periph_clkout demo in LPCOpen library, it shows how to use the SYSCTL driver to enable a specific clock source on the CLKOUT pin.
You can download the LPCOpen library via the following link:
https://www.nxp.com/support/developer-resources/software-development-tools/lpc-developer-resources-/....
Have a great day,
TIC
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