Description
The HD66750/1, dot-matrix graphics LCD controller and driver LSI, displays 128-by-128-dot graphics for four monochrome grayscales. Since the HD66750/1 incorporates bit-operation functions and a 16-bit high-speed bus interface, it enables efficient data transfer and high-speed rewriting of data in the graphics RAM. The following functions allow the user to easily see a variety of information: a smooth scroll display function that fixed-displays a part of the graphics icons and perform vertical smooth scrolling of the remaining bit-map areas, a double-height display function, and a hardware-supported window cursor display function.

Features
● 128 x 128-dot graphics display LCD controller/driver for four monochrome grayscales
● Fixed display of graphics icons (pictograms)
● 16-/8-bit high-speed bus interface capability
● Bit-operation functions for graphics processing incorporated:
   - Write-data mask function in bit units
   - Bit rotation function
   - Bit logic-operation function
● Low-power operation support:
   - Vcc = 1.8 to 3.6 V (low voltage)
   - VLCD = 5 to 15.5 V (liquid crystal drive voltage)
   - Two-, five-, six-, or seven-times booster for liquid crystal drive voltage
   - 64-step contrast adjuster and voltage followers to decrease direct current flow in the LCD drive bleeder-resistors
   - Power-save functions such as the standby mode and sleep mode supported
   - Programmable drive duty ratios and bias values displayed on LCD
● 128-segment x 128-common liquid crystal display driver
● n-raster-row AC liquid-crystal drive (C-pattern waveform drive)
● Duty ratio and drive bias (selectable by program)
● Window cursor display supported by hardware
● Vertical smooth scroll
● Partial smooth scroll control (fixed display of graphics icons)
● Vertical double-height display by each display raster-row
● Black-and-white reversed display
● No wait time for instruction execution and RAM access
● Internal oscillation and hardware reset
● Shift change of segment and common driver