A memory card connectable to a host, the memory card comprising: a host interface including a receiver, a first clock generator, a second clock generator, a sampling circuit and a transmitter, the receiver being configured to receive a first clock (RCLK) and serial data from the host, the first clock generator including a first voltage controlled oscillator and configured to generate a second clock (CLKO) on the basis of the first clock (RCLK), the second clock generator including a second voltage controlled oscillator and configured to generate a third clock on the basis of the serial data, the sampling circuit configured to sample reception data on the basis of the third clock and the serial data and the transmitter being configured to transmit transmission data (DOUT) to the host on the basis of the second clock (CLKO); and a controller configured to manage a state of the memory card, the state of the memory card including a first state and a second state, wherein: the first clock (RCLK) and the serial data are supplied to the receiver in the first state and are not supplied to the receiver in the second state, and in the first state, the first and second clock generators are in an operating state, in the second state, the first and second clock generators are in a non-operating state, the controller is further configured to, in a first recovery mode, start sampling of the reception data or transmitting of the transmission data to the host after a certain period of time after confirming a transition from the second state to the first state, and not transmit a response indicative of establishment of synchronization of the second and third clocks (CLKO, CLK1) to the host; the first clock generator includes a control voltage memory unit; and the control voltage memory unit is configured to store a control voltage value corresponding to a voltage controlling the first voltage controlled oscillator (VCO, 244) as an initial control voltage value when the frequency of the second clock (CLKO) is locked in the first state, and to apply a voltage corresponding to the stored initial control voltage value to the first voltage controlled oscillator in the first recovery mode. a host interface including a receiver, a first clock generator, a second clock generator, a sampling circuit and a transmitter, the receiver being configured to receive a first clock (RCLK) and serial data from the host, the first clock generator including a first voltage controlled oscillator and configured to generate a second clock (CLKO) on the basis of the first clock (RCLK), the second clock generator including a second voltage controlled oscillator and configured to generate a third clock on the basis of the serial data, the sampling circuit configured to sample reception data on the basis of the third clock and the serial data and the transmitter being configured to transmit transmission data (DOUT) to the host on the basis of the second clock (CLKO); and a controller configured to manage a state of the memory card, the state of the memory card including a first state and a second state, wherein: the first clock (RCLK) and the serial data are supplied to the receiver in the first state and are not supplied to the receiver in the second state, and in the first state, the first and second clock generators are in an operating state, in the second state, the first and second clock generators are in a non-operating state, the controller is further configured to, in a first recovery mode, start sampling of the reception data or transmitting of the transmission data to the host after a certain period of time after confirming a transition from the second state to the first state, and not transmit a response indicative of establishment of synchronization of the second and third clocks (CLKO, CLK1) to the host; the first clock (RCLK) and the serial data are supplied to the receiver in the first state and are not supplied to the receiver in the second state, and in the first state, the first and second clock generators are in an operating state, in the second state, the first and second clock generators are in a non-operating state, the controller is further configured to, in a first recovery mode, start sampling of the reception data or transmitting of the transmission data to the host after a certain period of time after confirming a transition from the second state to the first state, and not transmit a response indicative of establishment of synchronization of the second and third clocks (CLKO, CLK1) to the host; the first clock generator includes a control voltage memory unit; and the control voltage memory unit is configured to store a control voltage value corresponding to a voltage controlling the first voltage controlled oscillator (VCO, 244) as an initial control voltage value when the frequency of the second clock (CLKO) is locked in the first state, and to apply a voltage corresponding to the stored initial control voltage value to the first voltage controlled oscillator in the first recovery mode.