INSTRUCTION
HM17CM256 is a dot-Matrix LCD drive IC with 82 commons (80 + 2 icons) and 384 segments (128 X RGB) drive ports for 256 colors driving.
This IC stores the serial or parallel BIT data transferred by the microcomputer on the built-in RAM (81,920 bits for graphic + 2048 bits for icons) and generates the signals to drive LCD panel.

■ FEATURES
• 256 color bitmap LCD driver
• LCD drive outputs 128×RGB segments, 80 commons for graphic and 2 commons for icons
• Display RAM capacity 81,920bits (for graphic usage) 2,048bits (for icon usage)
• Gradation display 8 gradations can be selected from 32 gradations by PWM control
• Black/White display 82 × (128 × 3) bits display is possible
• 8 bit BUS interface directly connectable with 68 / 80 series CPU
• RAM data length 8 BIT / 16 BIT selectable
• Serial interface available
• Programmable duty / bias ratio with command
• Various instruction set
    display data read/write, display ON/OFF, positive/negative display, page address set
    display start line address set, partial display, bias select,
    column address set, all display ON/OFF, boosting selection, n line inversion mode
    read modified write, power save …
• Built-in voltage booster (programmable) : 7 × boosting
• Built-in voltage regulator
• Controllable contrast with built-in electric volume (128 steps)
• Low current consumption
• Logic supply 1.7V ~ 3.3V
• LCD drive supply 5.0V ~ 18.0V
• C-MOS silicon process
• Package bumped chip / bare chip