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)