How to cancell using PLL1 lock sequence.

[iwaomizota]

Hi all,

I use LPC4357.

I would like to make a sequnce to use IRC as BASE_M4_CLK source until wating PLL 1 to lock.

There are 9 STEP  on c hpater 13.2.2.1 of "UM10503".

4.Reconfigure PLL1 as fllows.

5.Wait for the PLL1 to lock.

Could you please tell me how to cancel using crystal oscillator as clock source for PLL1 and go back to use IRC before PLL 1 is locked on STEP5?

Best Regards.

[kerryzhou]

Hi Iwao Mizota,

    PLL1 source can be changed in register PLL_CTRL[CLK_SEL]. If you want to use the IRC, please set the CLK_SEL =0X01 instead of 0x06.

   

Wish it helps you!

If you still have question, please contact me!

Have a great day,

Kerry

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