HOW to using LPC54102 PLL

[zhan8g]

LPC54102 uses 32.768KHz, PLL to 12MHz, but after running for some time, the 12MHz master clock becomes 24MHz or something else. Why is that?

[zhan8g]

thanks. My LPC54102 using an external clock 32.768KHz, PLL to 12MHz for the master clock and the asynchronous clock，the code using pllfract.c of NXP lpc5410x_xpresso54102_keil_iar_v3.03.000_16 from NXP web, but after running for some time, the 12MHz master clock becomes 24MHz or something else. IRC-12MHz is running for a long time, there is no problem. Now, there is a problem with the setPllRate function found in the pllfract.c file. Do you have a regular and stable setPllRate new function?

[jeremyzhou]

Hi a tom,

Thanks for your reply.

I think you use the LPCOpen library, and LPC54102 also has the KSDK library which is a new library, you can try it out.

Whether you can illustrate the steps to replicate the issue in details.

Welcome to MCUXpresso | MCUXpresso Config Tools 

Have a great day,
TIC

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[zhan8g]

thank you very munch.

[jeremyzhou]

Hi a tom,

Thank you for your interest in NXP Semiconductor products and 

for the opportunity to serve you.

I'd highly recommend you to use the visualize tool: Clocks Tool to configure the clock of the LPC54102.

Welcome to MCUXpresso | MCUXpresso Config Tools 

Have a great day,
TIC

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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