Overview

The LC74730M is a CMOS LSI for on-screen display, a function that displays characters and patterns on a TV screen under microprocessor control. (The LC74730M supports the S-VCR format.) The characters displayed have an 8 × 8 dots structure and a dot interpolation function is provided. The LC74730M display 10 lines of 24 characters each.

Features

• Screen format: 10 lines × 24 characters (up to 240

characters)

• Character format: 8 (horizontal) × 8 (vertical) (interpolation function provided)

• Character sizes: Three horizontal sizes and 3 vertical

sizes

• Number of characters in font: 64 characters

• Display start position

— Horizontal: 64 positions

— Vertical: 64 positions

• Blinking: In character units

• Types of blinking: Two types with approximately

1.0 sec. and 0.5 sec.

• Background color: Four background colors (in internal

synchronization mode)

(For the PAL-M format: 1 color; blue background)

• External control input: 8-bit serial data input format

• Built-in sync separator circuit

• Built-in synchronization recognition circuit: Recognizes

whether or not external synchronizing signals are

present

• Video output: NTSC and PAL-M format composite

outputs, Y-C output