Associate III

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How to set the clock source for TIM3

We are trying to use TIM3. We also want to use an external CLK as the clock source for TIM3, but we don't know how to set it.

.ioc file - Where should I change the TIM3 clock source settings?

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Best answer by mƎALLEm

Hello,

From the reference manual RM0433: / section 39.3.3 Clock selection:

You can select an external clock source for TIM3:

In CubeMx:

ST Technical Moderator

Hello @pass3master

Could you please provide the MCU you are Using.

Best Regards.

STTwo-32

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Associate III

The MCU we are using is STM32H743ZIT6.

mƎALLEmBest answer

ST Technical Moderator

Hello,

From the reference manual RM0433: / section 39.3.3 Clock selection:

You can select an external clock source for TIM3:

In CubeMx:

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

Associate III

That was a very easy-to-understand answer. Thank you.
If I select Internal Clock, what will be the accuracy and error of CLK?

ST Technical Moderator

@pass3master wrote:

If I select Internal Clock, what will be the accuracy and error of CLK?

It will be the accuracy of the system clock source: HSE/HSI etc ..

HSI, CSI accuracies are provided in the datasheet. HSE depends on the clock source you put as input.

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