topic Will FRO_HF trun off FRO_12M? in LPC Microcontrollers

Will FRO_HF trun off FRO_12M?

da_chen — Thu, 25 Jul 2019 06:30:12 GMT

I am using lpc54114. I found in SDK, when we use

CLOCK_SetupFROClocking(12000000)

It will turn off FRO_HF.

I wonder if we turn on FRO_HF, the FRO_12M will be turned off of not?

Re: Will FRO_HF trun off FRO_12M?

Alice_Yang — Fri, 26 Jul 2019 01:47:37 GMT

Hello Da Chen,

"if we turn on FRO_HF, the FRO_12M will be turned off of not?"

-> Yes, it will turned off. Only can choose one of them as input:

Hope it helps,

Have a great day,
TIC

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Re: Will FRO_HF trun off FRO_12M?

da_chen — Mon, 29 Jul 2019 01:14:25 GMT

Hi Alice_Yang,

Thanks for your replying.

But how can you tell the fro working status just from the picture you provided? MAINCLKSELA is just for choosing clock source, right? Although the fro_hf is chosen as the input? Can't the fro_12m still running?

Da Chen

Re: Will FRO_HF trun off FRO_12M?

Alice_Yang — Wed, 31 Jul 2019 03:21:45 GMT

Hello Da Chen,

Sorry I misunderstood your meaning.

Yes, the FRO_12M still running, there is no register that disable this clock in LPC54114.

Hope it helps,

TIC

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