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