Clock frequency

Rajinder1268 · Apr 11, 2022

Hi
I am looking to use a stm32f215 processor.
From the datasheet it states clock frequency of 120MHz.
I wanted to ask if this is achieved by using prescalers or multiplying the external clock by a factor?
I don't remember seeing a 120MHz external crystal.
This has been confusing me.
Can anyone assist?
Thanks in advance

stenzer · Apr 11, 2022

Hi,

a quite useful tool is CubeMX [1], whcih is provided fror free by ST. It is really handy if one has to configer several clocks as it shows what's possible and which frequencies are resulting [2]. So you can figure out which external clock you need. BTW, you can also use an external oscillator which is available with 120 MHz for sure.

[1] https://www.st.com/en/development-tools/stm32cubemx.html
[2] https://microtechnics.ru/en/stm32cube-rcc-clock-configuration/

BR

KlausST · Apr 11, 2022

Hi,

I don't know the answer, thus I'd try:
* Read the datasheet or use STM32Cube.
* I guess there are other tools and documents in the internet.

Btw: Farnell lists about 300 different "standard oscillators" >= 120MHz. Additionally there are others.

Klaus

Clock frequency

Rajinder1268

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stenzer

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KlausST

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Clock frequency

Rajinder1268

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