Overview

The LC74798 and LC74798M are on-screen display controller CMOS ICs that display characters and patterns on the TV screen under microprocessor control. These ICs include a built-in PDC/VPS/UDT interface circuit.

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: 1.0 second and 0.5 second

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

• Background color

— 8 colors (internal synchronization mode): 4fSC

— 6 colors (internal synchronization mode): 2fSC

— Blue background only: NTSC

• Line background color

— Three lines can be set up.

— 8 line background colors (in internal synchronization mode): 4fSC

— 6 line background colors (in internal synchronization mode): 2fSC

• External control input: 8-bit serial input format

• On-chip sync separator and AFC circuits

• On-chip PDC/VPS/UDT interface circuit

• Video outputs: PAL and NTSC format composite video outputs

• Package: DIP30SD (400 mil)

MFP30S (375 mil)