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Disable read coherency mechanism for dual edge capture on FTM

Question asked by Andy Berger on Jul 20, 2018
Latest reply on Jul 23, 2018 by xiangjun.rong

When an FTM module is set up for dual edge capture, can the "read coherency mechanism" (Section 40.4.24.5 of K64 Reference Manual) be disabled? That is, I would like to always--and instantly--capture the value of both rising and falling edges to their respective C(n)V and C(n+1)V registers. I do not want to wait until a falling edge to record the the counter value of the paired rising edge, as is enforced by the read coherency mechanism. Is this possible?

 

I suppose that one possible way would be to physically wire the signal to two different pins, corresponding to the C(n)V and C(n+1)V inputs, and have each monitor only the rising or falling edge, rather than having a single pin monitor both rising and falling edges. However, this seems unnecessarily complicated.

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