real time problem with MCF5485

Fri Jul 11 14:12:54 UTC 2008

Hi,

We notice a strange problem with Coldfire MCF5485 (and also with MCF5234):

The treatment time (the time for the CPU to run the code) of an ISR, which has the highest priority level, varies according to the code that run on others ISR or Main task. !!!!

We verified that the Real time ISR (the one with the highest priority) is never preempt !

We also use MCF5407. There's no problem with it.

Any idea ?

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Jean Christophe BARRIOL

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