Read Frequency and Dudy Cycle of an eTPU Channel

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Read Frequency and Dudy Cycle of an eTPU Channel

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ronlewis
Contributor III

Looking for some guidance on reading frequency and pulse width on an ETPU Channel.  I am targeting the MPC5644a.  It does not appear the function sets allow both at the same time.

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Which function is this question related to? PPA? FPM? Other?

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ronlewis
Contributor III

I have looked at FPM and PPA.  It looks like the FPM handles the frequency and PPA will handle the pulse width/dudy cycle, but is there a method to do both?

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davidtosenovjan
NXP TechSupport
NXP TechSupport

You can use two PPA instances and measure period and duty or FPM and PPA function and measure frequency and duty. Note that by duty I mean pulse width.

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ronlewis
Contributor III

It does not appear that you can add two functions to a single channel.  So how would I use a PPA and an FPM on a single channel/pin?  

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