描述 Description

The HD66724/HD66725, dot-matrix graphics LCD controller and driver LSI incorporating a key scan function up to a 4-by-8 key matrix, display characters such as alphanumerics, katakana, hiragana and symbols as well as graphics such as kanji and pictograms. They can be configured to drive a dot-matrix liquid crystal display and control key scan functions under the control of the microprocessor connected via the clock-synchronized serial or 4/8-bit bus.

特性 Features

? Control and drive of a character and graphics LCD with built-in key scan functions

? Three 12- (16-) character lines, 72 (96) -by-24 dot graphics, and 144 (192) segments

? 48 (64) grayscale segments

? Control up to a 4 × 8 (32 key) matrix key scan.

? 3 general ports built-in

? Low-power operation support:

- Vcc = 1.8 to 5.5 V (low voltage)

- VLCD = 3.0 to 6.5 V (liquid crystal drive voltage)

- Single, double or triple booster for liquid crystal drive voltage

- Contrast adjuster and voltage followers to decrease direct current flow in the LCD drive bleederresistors

- Wake-up feature using key scan interrupt

- Programmable drive duty ratios and bias values displayed on LCD

? Clock-synchronized serial interface

? 4-/8-bit bus interface capability (except when key scan circuit is used)

? 80 × 8-bit display data RAM (80 characters max)

? 20,736-bit (6 × 8 dots : 432 characters) character generator ROM

? 384 × 8-bit (64 characters) character generator RAM

? 96 × 2-bit (192 segment-icons and marks max) segment RAM

? 72- (96-) segment × 26-common-signal liquid crystal display driver

? Programmable display sizes and duty ratios

? Vertical and horizontal smooth scrolls

? Vertical double-height display

? Selectable CGROM memory bank (max. 432 fonts)

? Wide range of instruction functions:

- Clear display, display on/off control, icon and mark control, character blink, black-white reversed blinking cursor, return home, cursor on/off, black-white reversed raster-row

? No wait time for instruction execution and RAM access (zero instruction)

? Internal oscillation (with external or built-in resistor) hardware reset

? Shift change of segment and common driver

? Slim chip with bumps for chip-on-glass (COG) mounting, and tape carrier package (TCP)