Data transfer control device, electronic equipment and data transfer control method

A data transfer control method for a controller which performs operation control of a host function and a peripheral function by transitioning between a plurality of states, the data transfer control method comprising:

• detecting a signal state of at least one of data lines and power supply line
• allowing a given processing section to judge a state of a transition destination based on a result detected for the signal state and to set a state command corresponding to the state of the transition destination;
• and
• controlling the signal state of at least one of the data lines and the power supply line based on the state command,
• the given processing section starting counting a given time-out period in a state corresponding to a first state command, and allowing transition to a state corresponding to the result detected for the signal state when the given time-out period has elapsed.