I'm using the external clock source on the MPC5643L. THe problem is that I've found that the timers (e.g. PIT) expires as twice as slow than predicted. I think the clock I'm providing from the outside is divided from the internal plls, even if in ME_RUNX_MC I selected as SYSCLK the 4- 40 MHz oscillator instead of FMPLL. What register do I have to check? I'm sure that the system is using the external clock as the timeouts changes according to the external clock period.
Thank you very much.