Universal serial bus port controller and electronic apparatus

A universal serial bus port controller on a source side, the universal serial bus port controller being compatible with universal serial bus Type-C,

• a source equipped with the universal serial bus port controller including
• a power supply terminal,
• a power supply circuit,
• a switch connected between an output of the power supply circuit and the power supply terminal,
• a capacitor connected to the power supply terminal, and
• a discharge resistance and a discharge switch connected in series with each other between the power supply terminal and a ground line,
• the universal serial bus port controller comprising:
• an abnormality detector configured to:
• determine a threshold voltage that decreases according to an elapsed time from turn on of the discharge switch;
• detect an output voltage of the power supply terminal at a plurality of times after the turn on of the discharge switch;
• and
• detect, based on a temporal change in the output voltage, an abnormality when the output voltage detected at a time of the plurality of times exceeds the threshold voltage corresponding to the time.