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How to use the Frequency Meter in the MPC5645S?

Question asked by Ferenc Kovacs on Jan 5, 2018
Latest reply on Jan 30, 2018 by Ferenc Kovacs

Hello all,


I would like to measure the frequency of the SXOSC. For this, I would like to use the CMU (Clock Monitor Unit). 

My problem is that I cannot write to the appropriate registers. 

- The processor is in DRUN mode.

- There is no active write protection for the CMU registers. 

- The system clock is the FXOSC. 

- FXOSC, SXOSC are enabled. 


Any idea what could cause the problem?


Thank you!


János Murai