topic Re: LPC54018 peripheral clock initialization in LPC Microcontrollers

LPC54018 peripheral clock initialization

Renuga_AKAS — Thu, 25 Aug 2022 10:25:47 GMT

Hi,

I tried to configure 48MHz for flexcomm peripheral through clock attach clock function using kFRO_HF_to_FLEXCOMM9. But unable to do so. can yous suggest me how can i convert 98MHz clock frequency to 48MHz.

Re: LPC54018 peripheral clock initialization

ZhangJennie — Fri, 26 Aug 2022 06:31:55 GMT

Hi Renuga_AKAS

We use FRO_HF divider to divide FRO96M. please see configuration as below

Hope this helps,

Jun Zhang

Re: LPC54018 peripheral clock initialization

Renuga_AKAS — Mon, 29 Aug 2022 04:25:41 GMT

Hi,

Thanks for the reply. I will try to configure the clock as you mentioned above. I have another doubt about clock configuration, is it possible to set clock frequency as below 12MHz?. If yes, it it the same way as mentioned above by dividing the FRO_12M frequency?

Re: LPC54018 peripheral clock initialization

ZhangJennie — Mon, 29 Aug 2022 10:11:58 GMT

Hi Renuga_AKAS

According to UM11060, Chapter 8, Fig 21,Fig 22. FRO_HF has FRO clock divider but FRO_12M doesn't have.

So we can't find the same option if using FRO_12M in clock configuration tool.

Hope this helps

Jun Zhang

Re: LPC54018 peripheral clock initialization

Renuga_AKAS — Mon, 29 Aug 2022 10:32:20 GMT

Hi,

Thanks for the useful reply. I still need a clarification is it possible to configure peripheral clock below 12MHz?.

Re: LPC54018 peripheral clock initialization

ZhangJennie — Mon, 29 Aug 2022 10:43:48 GMT

Yes. For example, When use FRO_HF, and set FRO_HF divider as 10, we get 9.6M Hz output.

Re: LPC54018 peripheral clock initialization

Renuga_AKAS — Mon, 29 Aug 2022 11:43:19 GMT

Hi,

Thanks for the solution.