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Do i need extrenal oscilator for STM32H503CBT6

transistor
Visitor

image.png

if in the stm32cubeide clock configuration the extrenal oscialtors aren't highlighted it means that i dont need extrenal oscialtor on my custom board?

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If pwm is used for example to control motor speed, no need for crystal in that case. No need for crystal for i2c.

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3 REPLIES 3
mƎALLEm
ST Employee

Hello @transistor and welcome to the ST community,

That depends on your application. For example, if you plan to use FDCAN interface you need a crystal.

Toggling a LED doesn't need a crystal. You can use HSI as a clock source.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

i want to use i2c, pwm so the HSI should be enough?

If pwm is used for example to control motor speed, no need for crystal in that case. No need for crystal for i2c.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.