Min high input voltage (Arduino Micro)

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hi all!
i'm using pulsein() function read ppm signal through arduino micro. problem arduino micro operates @ 5v whereas ppm signal goes 0 3.3v. arduino micro detect 3.3v high level? couldn't find these specifications in arduino website. so, limits high level on arduino micro?

thanks in advance.

you should fine..... 3.3v should read high.


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