About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

RE: About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

Emil Lenngren — Fri, 16 May 2025 07:13:33 GMT

Yes, in the data sheet in the register description, all registers are by not retained unless explicitly stated otherwise.

You can see that XOSC32KI.INTCAP is marked as retained while XOSC32M.CONFIG.INTCAP is not.

I suspect this is due to the fact that the internal low frequency counter of GRTC will keep running during a soft reset or reset due to wake up from system off.

RE: About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

H-ogawa — Fri, 16 May 2025 00:18:08 GMT

Hi Emil

Thank you for your advice.

I understood that the startup code sets the appropriate registers based on the specified load capacitance.

You have said that the HFXO INTCAP is not retained across a software reset, but is this documented anywhere?

Best regards,

Hiroki

RE: About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

Emil Lenngren — Thu, 15 May 2025 09:29:11 GMT

When you use any nRF Connect SDK project, Zephyr will set INTCAP during initialization, before main is called, according to the desired capacitance set in your board device tree file and the trim values in FICR. That is done here: https://github.com/nrfconnect/sdk-zephyr/blob/43c5dc730e385c238ce00ea91d1a772709b49abf/soc/nordic/nrf54l/soc.c#L41. For the devkits, the capacitance is set here: https://github.com/nrfconnect/sdk-zephyr/blob/43c5dc730e385c238ce00ea91d1a772709b49abf/boards/nordic/nrf54l15dk/nrf54l_05_10_15_cpuapp_common.dtsi#L31. You can use your own desired capacitance values when you create your custom board device tree file.

The LFXO INTCAP value is retained during a soft reset, while the HFXO INTCAP value is not.

RE: About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

H-ogawa — Thu, 15 May 2025 08:13:12 GMT

Hi,Sigurd

Thank you for your reply.

When I try this, do I erase it and then read the address value with nrfutil device?

Also, does this value change when you write firmware?

I have written the sample code for dtm.

best regards,

Hiroki

RE: About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

Sigurd Hellesvik — Thu, 15 May 2025 07:52:15 GMT

These are likely written when you build and flash for the DK, and one is retained over resets.
Try to erase the DK, then power it off and on again, and then recover the DK. The registers should now have their reset values.

Ref

RE: About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

H-ogawa — Wed, 14 May 2025 23:42:27 GMT

Hi,Sigurd

XOSC32M.CONFIG.INTCAP 0x26

XOSC32KI.INTCAP 0x13

Best regards,

Hiroki

RE: About XOSC32M.CONFIG.INTCAP and XOSC32KI.INTCAP

Sigurd Hellesvik — Wed, 14 May 2025 08:57:45 GMT

Hi,

[quote user=""]I checked these two registers with nrf54ldk, but they were not the reset values.[/quote]

What are the values you read?

Regards,
Sigurd Hellesvik