a semiconductor integrated circuit device upon exiting from a low power mode , wakes up and re - initializes logic circuits so as to restore previous logic states of internal registers without disturbing input - output configuration control and data states present at the time the low power mode was entered . thus not distributing the operation of other devices connected to the semiconductor integrated circuit device previously in the low power mode . once all internal logic and registers of the semiconductor integrated circuit device have been re - initialized , a “ low power state wake - up and restore ” signal may issue . this signal indicates that the i / o configuration control and data states stored in the i / o keeper cell at the time the integrated circuit device entered into the low power mode have been reinstated and control may be returned to the logic circuits and / or internal registers of the semiconductor integrated circuit device .