Patent ID: 9383792
Filing Date: 2016-07-05
CPC Classification: G06F,G06K

Claim Text:
1. A connectable device connectable to a host device comprising: a connectable interface that can receive a command signal via a command/response signal line, receive a clock signal via a clock signal line, transmit a response signal via the command/response signal line, and transmit and receive a data signal via data signal lines at any one signal voltage selected from a first voltage and a second voltage which is lower than the first voltage; a regulator that can output the first voltage and the second voltage; and a connectable device controller, the connectable device controller being configured to: receive the command signal requesting switching of the signal voltage from the first voltage to the second voltage from the host device; send a response signal for notifying that the switching is possible to the host device, and thereafter set the command/response signal line and the data signal lines at a ground level; start, after the clock signal line is set at a ground level by the host device, processing for switching a voltage outputted by the regulator from the first voltage to the second voltage, apply, when detecting that a voltage other than the ground level is applied to the clock signal line by the host device, the second voltage to the command/response signal line and the data signal lines, which had been set at the ground level, to indicate completion of the switching processing to the host device, and start transmission/reception of signals at the second voltage after completion of the switching processing.