Auto switch to internal RC oscillator when external clock fails?

[Abhishek Kumar]

Posted on January 09, 2018 at 13:53

I am working STM32F777 mcu where I wanted to know if there is any way of a configuration in which when the external clock (HSE) fails, the mcu automatically selects HSI RC, i.e. the internal clock oscillator?

[waclawek.jan]

Posted on January 09, 2018 at 14:08

Read Clock security system (CSS) chapter in RM0410.

JW

[Bogdan Golab]

Posted on January 09, 2018 at 14:09

Maybe this will help:

http://www.st.com/content/ccc/resource/training/technical/product_training/group0/c8/9e/ff/ac/7a/75/42/d1/STM32F7_System_RCC/files/STM32F7_System_RCC.pdf/_jcr_content/translations/en.STM32F7_System_RCC.pdf

 

Clock Security System