> For the complete documentation index, see [llms.txt](https://nxp.gitbook.io/nxp-cup/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nxp.gitbook.io/nxp-cup/2024-fall-2025-nxp-cup-bare-metal-drivers/s32-design-studio-usage-tips/setting-clocks.md).
# Setting clocks
While configuring your peripherals, you may need to adjust the clock settings. For instance, a clock speed of 48 MHz might be too fast for UART communication. Let's now discuss clock configurations.
The diagram below illustrates the clock tree, showing how all clocks are distributed.
Clocks tool interface. The button for accessing it is highlighted in the top right
In the Peripheral Clock View tab, each peripheral is assigned a specific clock. These clocks will be utilized in subsequent driver configurations through the Microcontroller Unit (MCU) RTD driver.
In the Peripherals we go to MCU -> McuModuleConfiguration -> McuClockSettingConfig -> McuClockReferencePoint. Here you can see all the references to the clocks we are using in the project.
The last one (Lpuart1ClockReferencePoint) is used in the UART configuration we've talked about before.
For example let's say that we want to use the clock of LPUART2, another hardware channel for the UART module.
We go to McuClockReferencePoint and add a new reference. We give it a suggestive name like "Lpuart2ClockReferencePoint" and choose the pheripheral clock, "LPUART2\_CLK".
Note : This example is for demonstration purposes only, and the LPUART1 peripheral should use its own clock.
After this if we go back to the UART interface we can find the new clock reference.