Under the high-impedance state of initial value, the microcontroller performs internal control to prevent a current path for both input and output, and thus a current does not flow even when a terminal is opened. If a terminal is opened while it is fixed to “L” or “H” in output setting and a short circuit with an adjacent terminal, etc. occurs, a current may flow between the short-circuited terminals. In the high-impedance state, however, a current will not flow. Therefore, we recommend that a terminal be opened in the high-impedance state of initial value.