A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. A steel cone is rotatably disposed on the leg. According to the comparison of the comparator, when the voltage of the node is higher than the reference voltage, the step-up-type DC-DC converter activates a step-up function, and when the voltage of the node is equal to or less than the reference voltage, the step-up-type DC-DC converter deactivates the step-up function.