The spec sheet has a footnote about the 80 MHz limit for freq measurement. 80 MHz is stated as a *maximum* (and only on certain select input pins) but what you can realistically achieve may also be limited by the electrical characteristics of the signal source and the interconnect cabling.
Because the limit is based on signal integrity concerns, I'd venture that NO, you can't expect to measure the frequency of a 100 MHz external signal. It might seem to work, but it isn't spec'ed for it, so you shouldn't count on it.
-Kevin P
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