question of MCUXpresso Config Tool 25.6's clock config function for lpc54114

yhc123 — Tue, 17 Feb 2026 14:09:31 GMT

Hi,

I am trying to configure the CPU clock of the LPC54114 using MCUXpresso Config Tools 25.6. I want to use FRO_96M as the CPU clock, so I first selected ‘Board BootClockFROHF96M’ in the CFG view. Then I set MAINCLKSELA to ‘FRO 96’ and MAINCLKSELB to ‘MAINCLKSELA’.

However, I found that in the generated code (clock_config.c), the BOARD_InitBootClocks function still calls BOARD_BootClockPLL150M() instead of the modified BOARD_BootClockFROHF96M() function.

Do I need to perform any additional configuration steps in the CFG view to ensure that the tool generates code using BOARD_BootClockFROHF96M()?

Re: question of MCUXpresso Config Tool 25.6's clock config function for lpc54114

luis_maravilla — Wed, 18 Feb 2026 22:48:24 GMT

Hello

Could you help us confirm that the "Update Code" option in Overview tab from Clocks Tools is enabled?

In [Functional group properties] in the toolbar, you can select BOARD_BootClockFROHF96M and enable the "Called by the default initialization function" so the BOARD_InitBootClocks initializes the BOARD_BootClockFROHF96M.

I notice in your first photo that when selecting the MAINCLKSELA it shows 48 MHz instead of the 96MHz; according to LPC5411x User manual [UM10914] Chapter 6 Table 153. FRO Control Register, bit 14 is fro_hf_output status bit, if read as 0, fro_hf is 48 MHz. If read as 1, fro_hf is 96 MHz.

Could you help us select in the clocks diagram the option FRO96 (fro_hf) and "Update Code".

Then in Registers tool search for SYSCON_FROCTRL>SEL to confirm its on 1 [96MHz]

Let me know your findings,

Best Regards, Luis

LPC Microcontrollersのトピックquestion of MCUXpresso Config Tool 25.6's clock config function for lpc54114

question of MCUXpresso Config Tool 25.6's clock config function for lpc54114

Re: question of MCUXpresso Config Tool 25.6's clock config function for lpc54114