The NJU6624A/B is a Dot Matrix LCD controller driver for 12-character 1-line with icon display in single chip. It contains bleeder resistance, general output port, keyscan circuit, CR oscillator, microprocessor interface circuit, instruction decoder controller, character generator ROM/RAM, high voltage operation common and segment drivers, and others. The character generator ROM consisting of 7,840 bits stores 224 kinds of character Font. Each 1,120 bits CG RAM and Icon display RAM can store 32 kinds of special character displayed on the dot matrix display area or 60 kinds of Icon on the Icon display area. The 8-common (7 for character, 1 for icon) and 71-segment drivers operate 12-character 1-line with 60 Icon LCD display and LED driver drives 4 LED which can use like as indicator. The 16th display contrast control function is incorporated. Therefore, the contrast adjustment is operated easily by only simple power supply circuit on-chip. The complete CR oscillator requires no external components. The serial interface which operates by 1MHz, communicates with external MCU. As an outstanding feature, NJU6624A/B realizes the horizontal smooth scroll of characters by combination of instructions. The combination of NJU6624A as the Master and NJU6624B as the slave drive the 12-character and 2-line LCD panel or 24-character 1line in 1/8 duty.