Overview

The LC7471 is a video display controller for superimposing text and low-level graphics onto an NTSC-format television receiver. The LC7471 incorporates a 64 character internal character generator ROM, a 24-character × 64-line display ROM and a 176-character display RAM. Up to 288, 12 × 18-pixel characters can be displayed under microprocessor control on a 24-character by 12-line display.

The LC7471 features selectable pixel width and pixel height, and 64 vertical and 64 horizontal display start positions. It also features a flashing enable bit for each character position.

The LC7471 operates from a 5 V supply and is available in 22-pin shrink DIPs.

Features

• Complete text and graphics video overlay circuitry.

• 64-character internal character generator ROM.

• 24-character × 64-line display ROM.

• 176-character display RAM.

• 288-character display capability.

• 12 × 18-pixel characters.

• Four pixel widths.

• Four pixel heights.

• Selectable background color.

• Approximately 0.5 or 1 s period character flashing option.

• 25, 50 or 75 flashing duty cycle.

• Internal or external synchronization.

• Serial data control.

• 5 V supply.

• 22-pin shrink DIP.