The synchronous interrupt and asynchronous interrupt generated by the CMU_FC module.

[Pusoy]

Hi,

I am currently in need of using the CMU module and while reading the CMU_FC section under the Safety chapter of the S32K3XXRM manual, I discovered that for the interrupts generated by FC_0, there are two types: asynchronous event interrupt and synchronous event interrupt.

Pusoy_0-1701048773099.png

Could you please explain the differences between these two types of interrupts?

[danielmartynek · Accepted solution]

Hi @Pusoy,

The destructive reset is bond with the asynchronous mode, whereas the synchronous mode generates the CMU interrupt only.

Have a look at Figure 110. Frequency checking (FC) instances in the RM.

danielmartynek_0-1701159556010.png

Please note that there is an error in the image.

Swap the labels indicated by the arrows.

Best regards,

Daniel

[Pusoy]

Thanks for the reply, but I have a question.
According to the figure you provided, can I understand this way: for CMU_FC0, the FHH event can only be configured as a destructive reset event, and the FLL event can only be configured as an interrupt event.

[danielmartynek]

Hi @Pusoy,

Both can generate either synchronous or asynchronous events.

danielmartynek_0-1701936949164.png

The diagrams in my first post have been reported.

Regards,

Daniel