Printing apparatus

A printing apparatus comprising:

• a printing section performing printing on a medium;
• a power supply circuit supplying power to the printing section;
• a control circuit controlling the printing section and the power supply circuit;
• and
• a USB-Type-C interface configured to couple an external device and perform switching to a first state in which a printing operation is executed by the printing section in response to a request from the external device or a second state in which the power is supplied from the power supply circuit to the external device, wherein
• the USB-Type-C interface includes a state identification terminal held at a first potential indicating that the USB-Type-C interface is coupled in the first state or a second potential indicating that the USB-Type-C interface is coupled in the second state,
• the control circuit determines whether the external device is being coupled to the USB-Type-C interface,
• the control circuit starts controlling the state identification terminal to start repetitions of switching periods each including first and second unit times in each of which switching between the first potential and the second potential is performed, in response to the control circuit determining that the external device is not being coupled to the USB-Type-C interface,
• during the first and second unit times, a time at which the state identification terminal is held at the second potential is longer than or equal to a time at which the state identification terminal is held at the first potential, and
• ratios between the time at which the state identification terminal is held at the second potential and the time at which the state identification terminal is held at the first potential during the first and second unit times are different from each other.