The terminology gets mixed up all the time. Splits are often wrongly called taps.
Tap = Some winds of a coil are bypassed
Split = One entire coil of a humbucker is bypassed
You typically will only find taps on single coil pickups, most commonly (though it's not really common at all) on a P-90 or Tele bridge pickup so you can have a hotter wind with the full coil engaged, but then tap it to bypass some of the winds to get a lower output.
Humbuckers typically split, but do not typically have coil taps. There may be some out there I don't know of, but I'm only aware of the PRS humbucker pickups doing this: 513, 408, and MT models. They are unique in that they both split AND tap.
With the 408 in humbucker mode, you have the screw coil + tapped slug coil. In single coil mode, the humbucker is split and the tap is disengaged, so you have the full wind of the slug coil.
If you wanted to, you could also wire it to be split and tapped at the same time for a lower output single coil tone. You could also wire it to have both full coils in humbucker mode, which might be interesting, because the slug coil will be quite a bit hotter than the screw coil.
AFAIK, you cannot do the above with any other pickups. You certainly cannot do this with your typical off the shelf humbuckers. What you CAN do is the next best thing, which is to do a partial split like many other PRS guitars. By connecting the split coil to ground via a series resistor, some of the signal from the cancelled coil is allowed to pass through, which beefs up the tone.