How to set the clock source for TIM3

pass3master · ‎2025-01-05

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?

mƎALLEm · ‎2025-01-06

Hello,

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

You can select an external clock source for TIM3:

In CubeMx:

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STTwo-32 · ‎2025-01-05

Hello @pass3master

Could you please provide the MCU you are Using.

Best Regards.

STTwo-32

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pass3master · ‎2025-01-05

The MCU we are using is STM32H743ZIT6.

mƎALLEm · ‎2025-01-06

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 on "Accept as Solution" on the reply which solved your issue or answered your question.

pass3master · ‎2025-01-06

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

mƎALLEm · ‎2025-01-07

@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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