Overview

The LC74785 and LC74785M are on-chip EDS CMOS LSIs for on-screen display, a function that displays characters and patterns on a TV screen under microprocessor control. These LSIs support 12 × 18 dot characters and can display 12 lines by 24 characters of text.

Features

• Display format: 24 characters by 12 rows (Up to 288 characters)

• Character format: 12 (horizontal) × 18 (vertical) dots

• Character sizes: Three sizes each in the horizontal and vertical directions

• Characters in font: 128

• Initial display positions: 64 horizontal positions and 64 vertical positions

• Blinking: Specifiable in character units

• Blinking types: Two periods supported: About 1.0 second and about 0.5 second

• Blanking: Over the whole font (12 × 18 dots)

• Background color

— Background coloring: 8 colors (internal synchronization mode): 4fsc

— Background coloring: 6 colors (internal synchronization mode): 2fsc

• Line background color

— Can be set for 3 lines

— Line background coloring: 8 colors (internal synchronization mode): 4fsc

— Line background coloring: 6 colors (internal synchronization mode): 2fsc

• External control input: 8-bit serial input format

• On-chip sync separator circuit

• EDS support

• Video output

— NTSC-format composite output

• Package

24-pin plastic DIP (300 mil)

24-pin plastic SOP (375 mil)