If you're using exactly the same setting for capture, timer1, etc, and it works 100%
on the 877A, but not on the 4620, then I would suspect a bug in the 4620, or something
has been changed somewhere between the 2 versions.
What values do you get if sending the raw value from period to your display immediately
after this?
period.LowByte=CCPR1L
period.HighByte=CCPR1H




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