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STM32F4 OSC Problem

Scarlet
Associate III

‎2024-04-17 05:09 AM

Hi everyone

I'm currently using the NUCLEO-F429ZI development board. I'm planning to create a PCB using the STM32F429ZIT6, but I've encountered some questions during the planning stage.

  1. According to the datasheet, HSE_OSC is specified to provide 8MHz, and CubeIDE also indicates "Input Freq HSE = 8MHz." However, on the NUCLEO-F429ZI development board, the JFVNY 25.000 oscillator supplies 25MHz. I have verified that the SPI clock indeed derives from multiplying and dividing an 8MHz source, but when I measure the JFVNY 25.000 oscillator on the development board, it does indeed supply 25MHz. Why are these two frequencies inconsistent, or am I misunderstanding something?
  2. Referring to the Clock tree and considering, if not using the RTC section, is it possible to omit providing the external LSE_OSE?
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Scarlet
Associate III
In response to Andrew Neil

‎2024-04-19 01:19 AM

I got it.

The crystal is used to active the MCU oscillator circuitry.

Normally, I called the crystal oscillator as the oscillator, so I overlooked the difference between the two.

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