Overview
The LC74770M is a CMOS LSI that implements on-screen display, a function that displays characters and patterns on display screens such as camcorder viewfinder screens under microprocessor control. This LSI displays 12-dot by 18-dot characters.

FEATUREs
• Display format: 24 characters by 12 rows (up to 288 characters)
• Characters displayed: Up to 288 characters
• Character format: 12 (horizontal) × 18 (vertical)
• Characters in font: 128
• Character sizes: Normal and double
• Initial display positions: 64 horizontal positions and 64 vertical positions
• Reverse video function: Characters can be displayed in reverse video specified in units of individual characters.
• Blinking types: In character units in one of two periods, 1.0 second and 0.5 second, with a 50% duty.
• Outputs: Character and blanking data, with two output systems for each
• External control input: 8-bit serial input format
• General-purpose output port: 4 bits (controlled from the serial input data)