Description
The HD66712 dot-matrix liquid crystal display controller and driver LSI displays alphanumerics, numbers, and symbols. It can be configured to drive a dot-matrix liquid crystal display under the control of a serial or a 4- or 8-bit microprocessor. Since all the functions such as display RAM, character generator, and liquid crystal driver, required for driving a dot-matrix liquid crystal display are internally provided on one chip, a minimum system can be interfaced with this controller/driver.

FEATUREs
• 5 × 8 dot matrix possible
• Clock-synchronized serial interface capability; can interface with 4- or 8-bit MPU
• Low-power operation support:
    - 2.7 to 5.5V (low voltage)
    - Wide liquid-crystal voltage range: 2.7 to 11.0V max.
• Booster for liquid crystal voltage
    - Two/three times (13V max.)
• High-speed MPU bus interface (2MHz at 5-V operation)
• Extension driver interface
• Character display and independent 60-icon mark display possible
• Horizontal smooth scroll by 6-dot font width display possible
• 80 × 8-bit display RAM (80 characters max.)
• 9,600-bit character generator ROM
    - 240 characters (5 × 8 dot)
• 64 × 8-bit character generator RAM
    - 8 characters (5 × 8 dot)
• 16 × 8-bit segment icon mark
    - 96-segment icon mark
• 34-common × 60-segment liquid crystal display driver
• Programmable duty cycle (See List 1)
• Software upwardly compatible with HD44780
• Wide range of instruction functions:
    - Functions compatible with LCD-II: Display clear, cursor home, display on/off, cursor on/off, display character blink, cursor shift, display shift
    - Additional functions: Icon mark control, 4-line display, horizontal smooth scroll, 6-dot character width control, white-black inverting blinking cursor
• Automatic reset circuit that initializes the controller/driver after power on (standard version only)
• Internal oscillator with an external resistor
• Low power consumption
• TCP-128 pin, bare-chip