STM32f407 the timer6's frequence

2424824120 · ‎2013-10-04

Posted on October 05, 2013 at 04:14

TIM6 Update event occurs each 37.5MHz/256 = 16.406 KHz the words in the DAC exemple. I want to know how to get the 37.5MHz ,how to calculate it out.Thank you for your help.

Tesla DeLorean · ‎2013-10-04

Posted on October 05, 2013 at 04:36

To get to 37.5 MHz you need to run the CPU at 150 MHz, have a prescaler of zero (1 - 1), and period of 3 (4 - 1) as they are both integer factors.

1 * 4 * 37.5 = 150

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waclawek.jan · ‎2013-10-05

Posted on October 05, 2013 at 10:57

Next time, please tell us, *which* example are you talking about. I presume, the one from the STM32F4DISCOVERY firmware.

Googling yields a similar question:

http://www.keil.com/forum/22846/

I'd say, it's simply a copy/paste error and the demo was originally developed for a different STM32 model; or a project, which for some reason was clocked to different AHB clock frequency.

JW

2424824120 · ‎2013-10-05

Posted on October 05, 2013 at 11:50

Thank you for your answer!It is jus an error. Next time I'll clarify the problem.

2424824120 · ‎2013-10-05

Posted on October 05, 2013 at 11:53

Thank you for your answer.