Stylus and controller

A controller of a display device configured to perform a stylus detection operation in each of second period(s) arranged within a display cycle, which is a cycle of display operation, wherein

• after the stylus is detected by the detection operation, the controller transmits, once within the display cycle, a second command that identifies data to be transmitted by the stylus using the second period, and
• before the stylus is detected by the detection operation, the controller transmits, a plurality of times within the display cycle, a first command including type identification information that identifies a type of the display device.

A stylus for use with a controller of a display device, the controller configured to perform a stylus detection operation in each of second period(s) arranged within a display cycle, which is a cycle of display operation, wherein

• the stylus transmits a position signal in response to reception, from the controller, of a first command including type identification information that identifies a type of the display device, and
• the stylus transmits a data signal in response to reception, from the controller, of a second command that identifies data to be transmitted using the second period, the data signal including the data identified by the second command.