A transceiver comprising: a transmitter and a receiver connected to each other by a first line and a second line, wherein the transmitter is configured to transmit signals having a first voltage range to the first line and the second line in a first mode, and to transmit signals having a second voltage range smaller than the first voltage range to the first line and the second line in a second mode, and to encode an original payload in the second mode to generate a first payload, and transmits a clock training pattern and the first payload through the first line and the second line, wherein the transmitter comprises: a transmission controller which transmits the original payload based on an internal clock signal, and generates a first transmission request signal in the second mode; a data transmitter which generates the internal clock signal, and transmits a clock training pattern and the first payload to the first line and the second line; an encoder which encodes the original payload provided from the transmission controller into the first payload including an encoding key in the second mode, and transmits the clock training pattern to the data transmitter in response to the first transmission request signal,, wherein the transmitter further comprises: a clock counter which counts the internal clock signal, and generates a clock control signal in response to a preset count value; and a clock controller which masks some of the internal clock signal based on the clock control signal, the internal clock signal being used for delivery of the original payload, and provides a modified clock signal modified by the masking to the transmission controller and the encoder, and wherein the clock controller is configured to mask the internal clock signal during a masking period repeated at a preset cycle. a transmitter and a receiver connected to each other by a first line and a second line, wherein the transmitter is configured to transmit signals having a first voltage range to the first line and the second line in a first mode, and to transmit signals having a second voltage range smaller than the first voltage range to the first line and the second line in a second mode, and to encode an original payload in the second mode to generate a first payload, and transmits a clock training pattern and the first payload through the first line and the second line, wherein the transmitter comprises: a transmission controller which transmits the original payload based on an internal clock signal, and generates a first transmission request signal in the second mode; a data transmitter which generates the internal clock signal, and transmits a clock training pattern and the first payload to the first line and the second line; an encoder which encodes the original payload provided from the transmission controller into the first payload including an encoding key in the second mode, and transmits the clock training pattern to the data transmitter in response to the first transmission request signal,, wherein the transmitter further comprises: a clock counter which counts the internal clock signal, and generates a clock control signal in response to a preset count value; and a clock controller which masks some of the internal clock signal based on the clock control signal, the internal clock signal being used for delivery of the original payload, and provides a modified clock signal modified by the masking to the transmission controller and the encoder, and wherein the clock controller is configured to mask the internal clock signal during a masking period repeated at a preset cycle. a transmission controller which transmits the original payload based on an internal clock signal, and generates a first transmission request signal in the second mode; a data transmitter which generates the internal clock signal, and transmits a clock training pattern and the first payload to the first line and the second line; an encoder which encodes the original payload provided from the transmission controller into the first payload including an encoding key in the second mode, and transmits the clock training pattern to the data transmitter in response to the first transmission request signal,, wherein the transmitter further comprises: a clock counter which counts the internal clock signal, and generates a clock control signal in response to a preset count value; and a clock controller which masks some of the internal clock signal based on the clock control signal, the internal clock signal being used for delivery of the original payload, and provides a modified clock signal modified by the masking to the transmission controller and the encoder, and wherein the clock controller is configured to mask the internal clock signal during a masking period repeated at a preset cycle. a clock counter which counts the internal clock signal, and generates a clock control signal in response to a preset count value; and a clock controller which masks some of the internal clock signal based on the clock control signal, the internal clock signal being used for delivery of the original payload, and provides a modified clock signal modified by the masking to the transmission controller and the encoder, and wherein the clock controller is configured to mask the internal clock signal during a masking period repeated at a preset cycle.