Overview

The LC74789, LC74789M, and LC74789JM are on screen display controller CMOS ICs that display

characters and patterns on the TV screen under microprocessor control. These ICs 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: 256 (254 characters, one spacing character, and one transparent spacing character)

• 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: 8 colors (internal synchronization mode): 2fSCand 4fSC

• Line background color

— Can be set for 3 lines

— Line background color: 8 colors (internal synchronization mode): 2fSCand 4fSC

• External control input: 8-bit serial input format

• On-chip sync separator circuit

• Video outputs: NTSC, PAL, PAL-N, PAL-M, NTSC 4.43, and PAL60 format composite video outputs

• Package

— 24-pin plastic DIP-24S (300 mil)

— 24-pin plastic MFP-24 (375 mil)

— 24-pin plastic MFP-24S (300 mil)