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MPC5643L external clock source

Question asked by Stefano Di Mascio on Feb 25, 2016
Latest reply on Feb 26, 2016 by Petr Stancik



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.