cancel
Showing results for 
Search instead for 
Did you mean: 

What is the exact meaning of''the EXTI can detect an external line with a pulse width shorter than the internal APB2 clock period'' in STM32F1

Rashad Shubita
Associate III
Posted on December 28, 2017 at 13:31

0690X00000609JBQAY.png

Please if anyone can explain this to me!

Thanks in advance.
5 REPLIES 5
Uwe Bonnes
Principal III
Posted on December 29, 2017 at 12:10

A minimum pulse width on EXTI is enough to trigger the interrupt. This minimum pulse width is not dependant an th APB2 clock frequency,

Posted on December 29, 2017 at 17:28

But is likely dependent on the resychronizer at the pin.

Tips, Buy me a coffee, or three.. PayPal Venmo
Up vote any posts that you find helpful, it shows what's working..
Posted on December 29, 2017 at 23:15

Clive,

this has been discussed a couple of months ago, and as Edison from the ST Prague support group confirmed, EXTI is surprisingly asynchronous.

Jan

Posted on January 17, 2018 at 23:38

Just plugging in the link:

https://community.st.com/0D50X00009XkaBxSAJ

Rashad Shubita
Associate III
Posted on January 18, 2018 at 13:22

Thank you all for helping me !!