topic Re: LPC845 issues with 30 MHz clock in LPC Microcontrollers

LPC845 issues with 30 MHz clock

LucaCalicchia — Fri, 17 Feb 2023 08:51:58 GMT

Hi guys,

I'm working with LPC845 microcontroller.

My problem is when I configure the source clock to 30 MHz --> hardfault.

If I set this point to 24 MHz evething works well.

Are you able to help me?

Thanks.

Luca

Re: LPC845 issues with 30 MHz clock

RaRo — Mon, 20 Feb 2023 18:56:45 GMT

Hello @LucaCalicchia,

Could you please tell us how are you configuring the source clock to 30MHz?

Also, could you please try out an LPC845 example like led_blinky and modify the source clock to 30MHz? Let us know if the hardfault appears there too.

Best regards, Raul.

Re: LPC845 issues with 30 MHz clock

ErichStyger — Tue, 21 Feb 2023 07:33:47 GMT

Could you please tell us how are you configuring the source clock to 30MHz?

Like this?

It is part of the normal SDK examples for the LPC845-BRK.

Re: LPC845 issues with 30 MHz clock

ErichStyger — Tue, 21 Feb 2023 07:37:05 GMT

Hi @LucaCalicchia ,

It might have something to do with Flash access time.

I wrote about this here:

https://mcuoneclipse.com/2021/12/20/doubling-the-performance-of-nxp-lpc845-with-improved-flash-access-time/

What wait states are you using?

Erich