The HD66724/HD66725, dot-matrix graphics LCD controller and driver LSI incorporating a key scan function up to a 4-by-8 key matrix, display characters such as alphanumerics, katakana, hiragana and symbols as well as graphics such as kanji and pictograms. They can be configured to drive a dot-matrix liquid crystal display and control key scan functions under the control of the microprocessor connected via the clock-synchronized serial or 4/8-bit bus. The HD66724 is capable of displaying up to three 12character lines, 72-by-24 dot graphics and 144 segments. The HD66725 is capable of displaying up to three 16-character lines, 96-by-24 dot graphics and 192 segments. Of the 144 (192) segments displayed, 48 (64) segments can be grayscaled. The HD66724/HD66725 have a smooth horizontal/vertical scroll display and double-height display so that the user can easily see a variety of information within a small LCM. The HD66724/HD66725 have various functions to reduce the power consumption of an LCD system such as low-voltage operation of 1.8 V or less, a booster to generate maximum triple LCD drive voltage from the supplied voltage, and voltage-followers to decrease the direct current flow in the LCD drive bleederresistors. Combining these hardware functions with software functions such as standby and sleep modes allows fine power control. The HD66724/HD66725 are suitable for any portable battery-driven product requiring long-term driving capabilities and small physical dimensions such as cellular phones, pagers, portable audio devices, or electronic wallets.