Overview

The LC74711 is a CMOS LSI for applications involving microcomputer control of on-screen character and graphics displays. Built-in character ROM supplies 128 alphanumerics and each character is generated in a 12 by 18 pixel format. The display is capable of supporting a maximum of 288 characters within a 24 characters by 12 line array.

Functions and Applications

(1) Screen construction: 24 characters X 12 lines

(2) Number of characters displayed: Maximum 288 characters capacity

(3) Display control ROM (line ROM): 64 lines (line unit control: 24 character construction)

(4) Display RAM: 176 characters (supporting extended character selection)

(5) Character construction: 12 (horizontal) X 18 (vertical) pixels

(6) Character set: 128 types of characters

(7) Character size: 4 horizontal types and 4 vertical types

(8) Display starting position: 64 types horizontally and 64 types vertically

(9) Blinking: Character units

(10) Blinking types: 2 types with approximate 1.0 s and 0.5 s cycles and 3-type selection for 25, 50 and 75 duty

(11) Blanking: Font complete blanking (12 X 18 pixels)

(12) Background color: 8 background tints (during internal synchronizing operation: 4 fsc when using crystal oscillator)

(13) External control input: Serial data input

(14) Synchronizing signal: Internal synchronizing, supports external synchronizing changeover

(15) Built-in synchronizing separator circuit

(16) Video output: NTSC system composite video output

(17) Superimpose: Characters superimposed over composite video output

(18) Package: DIP-22S