As the operating frequency of a semiconductor device has increased year by year, it has become common to adjust the driving capability of the input, output, or input and output terminals of a semiconductor device. Adjusting a driving capability means adjusting the impedance of an output driver or an input driver in a semiconductor device and compensating for a voltage so that the respective resistances of a pull-up resistor and a pull-down resistor that constitute the driver of an output (or input) terminal become equal to each other.
Related art is discussed in Japanese Laid-open Patent Publication No. 10-50070, Japanese Laid-open Patent Publication No. 2003-188705, and Japanese Laid-open Patent Publication No. 2005-65249.