In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jon Williams wrote:

1. Hi-Z (high impedance) in when the pin is set to an input state; when made an output there is a low-impedance path to Vdd (high) or Vss (low).

2. That depends on where you want the transition to occur.  When timing the discharge of a cap, for example, TTL is preferable as the transition is at 1.4 volts so there is a greater "distance" between 5 (fully charged) and 1.4 (transition to 0).  If the pin was set to CMOS and running at 5 volts, the transition point would be 2.5 volts.  Given the same cap timing routine, the granularity would be greater.

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