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)