FCCU: difference between Non-critical fault and critical fault

[shawnzhao]

What is difference to deal with the fault by FCCU between non-critical fault and critical fault?

The reference manual of 5744P only describes the "Non-critical FAULT (ALARM state) recovery" process.(Figure 69-3 and Figure 69-4 in the RM)

For example, the NCF[47] is defined to "critical fault" in reference manual--NCF[47] ADC_0_CF Internal self test (critical fault), if this fault injected, how to recover this fault or this fault cannot be recovered?

Thanks!

[petervlna · Accepted solution]

Hi,

On MPC57xx devices FCCU do not have Critical faults.

Only non-critical faults.

This is why all the faults are named NCF[xx].

If you look more carefully to the FCCU Non-Critical Faults Mapping you will that all faults are non-critical.

But the fault source (module) can be marked as critical if this fault is critical for reporting module (ADC).

However all faults can be handled only as non-critical even if ADC mark is a critical.

No big deal here, just service all faults in FCCU as non-critical.

I suggest you to have a look on my application notes:

http://cache.nxp.com/files/microcontrollers/doc/app_note/AN5284.pdf?fsrch=1&sr=2&pageNum=1

http://cache.nxp.com/files/32bit/doc/app_note/AN5259.pdf?fsrch=1&sr=3&pageNum=1

Peter

[shawnzhao]

Peter,

Thank you! You gave me a perfect answer!