Overview
The LC75817E and LC75817W are 1/8 to 1/10 duty dot matrix LCD display controller/drivers that supports the display of characters, numbers, and symbols. In addition to generating dot matrix LCD drive signals based on data transferred serially from a microcontroller, the LC75817E and LC75817W also provide on-chip character display ROM and RAM to allow display systems to be implemented easily. These products also provide up to 4 general-purpose output ports and incorporate a key scan circuit that accepts input from up to 30 keys to reduce printed circuit board wiring.

Features
• Key input function for up to 30 keys (A key scan is performed only when a key is pressed.)
• Controls and drives a 5 × 7, 5 × 8, or 5 × 9 dot matrix LCD.
• Supports accessory display segment drive (up to 60 segments)
• Display technique:
    1/8 duty 1/4 bias drive (5 × 7 dots)
    1/9 duty 1/4 bias drive (5 × 8 dots)
    1/10 duty 1/4 bias drive (5 × 9 dots)
• Display digits:
    12 digits × 1 line (5 × 7 dots, 5 × 8 dots)
    11 digits × 1 line (5 × 9 dots)
• Display control memory
    CGROM: 240 characters (5 × 7, 5 × 8, or 5 × 9 dots)
    CGRAM: 16 characters (5 × 7, 5 × 8, or 5 × 9 dots)
    ADRAM: 12 × 5 bits
    DCRAM: 48 × 8 bits
• Instruction function
    Display on/off control
    Display shift function
• Sleep mode can be used to reduce current drain.
• Built-in display contrast adjustment circuit
• Up to 4 general-purpose output ports are included.
• Serial data I/O supports CCB format communication with the system controller.
• Independent LCD drive block power supply VLCD
• A voltage detection type reset circuit is provided to initialize the IC and prevent incorrect display.
• The INH pin is provided. This pin turns off the display, disables key scanning, and forces the general-purpose output ports to the low level.
• RC oscillator circuit