topic Re: MCXN236 RTC in MCX Microcontrollers

MCXN236 RTC

LocNguyen31 — Thu, 20 Feb 2025 06:19:55 GMT

Dear Team,

I'm working with FRDM-MCXN236, I tried to demo RTC with irtc example code but got issue while i config to use external 32.768Khz OSC,

The issue as picture, please help to advise solve solutions.

thanks,

Re: MCXN236 RTC

Alice_Yang — Thu, 20 Feb 2025 10:36:57 GMT

Hello @LocNguyen31

Please double - check whether there are capacitors connected to EXTAL32K.

Alice

Re: MCXN236 RTC

LocNguyen31 — Thu, 20 Feb 2025 10:40:30 GMT

Hi Alice Yang,

no Capacitor for this circuit, but i have measure the signal for this Crystal, the signal wave form is good, so Can we can ignore the hardware issue?

thanks.

Re: MCXN236 RTC

Alice_Yang — Fri, 21 Feb 2025 02:26:48 GMT

Hello @LocNguyen31

Please debug step by step to check which code causes the crash.

If a crash occurs during download, please create a new MCUXPresso IDE workspace and a new project. Pay attention to choosing the right chip. Then, configure the CLOCK, build the project, and start debugging.

Alice

Re: MCXN236 RTC

LocNguyen31 — Tue, 04 Mar 2025 08:42:24 GMT

Hi Alice,

Still bug at line 363 in file clock_config.c, i'm trrying to study this register, I still don't understand why there is a bug at this command line

RTC0->CTRL |= RTC_CTRL_CLK_SEL_MASK;

Re: MCXN236 RTC

Alice_Yang — Wed, 05 Mar 2025 03:15:24 GMT

Hello @LocNguyen31

Please connect capacitors to EXTAL32K. The external passive crystal oscillator must be connected to capacitor.

Alice

Re: MCXN236 RTC

kingchen2019 — Wed, 05 Mar 2025 05:47:43 GMT

note： below update.
/* Enable fro16k[0] to domain Vbat and Main */
// CLOCK_SetupClk16KClocking(kCLOCK_Clk16KToVbat | kCLOCK_Clk16KToMain);
CLOCK_SetupOsc32KClocking(kCLOCK_Osc32kToVbat | kCLOCK_Osc32kToMain);