SIGNAL OUTPUTTING APPARATUS, COMMUNICATION SYSTEM, SIGNAL OUTPUTTING METHOD, AND COMMUNICATION METHOD

摘要

The objective of the invention is to increase the signal transmission amount per unit time without increasing the clock rate and the number of signal lines. A control unit (22) causes the output impedance of an output unit (20) to match the characteristic impedance of a signal line (26) during a signal level non-transition time period. If the second bit of a signal to be processed is a first value, the control unit (22) causes the output impedance to match the characteristic impedance during a signal level transition time period as well. If the second bit is a second value, the control unit (22) causes the output impedance not to match the characteristic impedance during the signal level transition time period.