{"id":14395,"date":"2023-04-17T10:28:49","date_gmt":"2023-04-17T04:58:49","guid":{"rendered":"https:\/\/fastbitlab.com\/?p=14395"},"modified":"2023-09-07T12:40:22","modified_gmt":"2023-09-07T07:10:22","slug":"stm32-ltdc-lcd-tft-lvgl-mcu3-lecture-16-setting-up-main-system-clock-of-the-mcu","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/stm32-ltdc-lcd-tft-lvgl-mcu3-lecture-16-setting-up-main-system-clock-of-the-mcu\/","title":{"rendered":"STM32-LTDC, LCD-TFT, LVGL (MCU3) Lecture 16| Setting up main system clock of the MCU"},"content":{"rendered":"
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Setting up main system clock of the MCU<\/strong><\/span><\/h1>\n
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Setup main system clock(SYSCLK)<\/b><\/span><\/p>\n

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Figure 1. Setup main system clock(SYSCLK)<\/figcaption><\/figure>\n

We will configure SYSCLK for the maximum value the microcontroller can achieve for the display VIBGYOR bars exercise.<\/span><\/p>\n

In the microcontroller STM32F429IDISCOVERY board, the maximum value for the SYSCLK could be 180MHz. That is the maximum speed of the SYSCLK.  And for this STM32F746GDISCOVERY microcontroller, it could be 216MHz, and for the STM32F407DISCOVERY board, it could be 168MHz.<\/span><\/p>\n

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For that, you have to use the PLL engine of the microcontroller.<\/span><\/p>\n

Let’s explore the PLL engine and how to configure the system clock using the PLL engine of the microcontroller.<\/span><\/p>\n

Main PLL configuration<\/b><\/span><\/p>\n