The TMP82C79F-2 is a Programmable Keyboard/Display Interface manufactured by Toshiba Semiconductor and Storage. It is designed to interface a microprocessor to a keyboard for input and to a display for output. The device provides scanned keyboard interface, scanned display interface, and sensor matrix interface capabilities. This chip significantly reduces the complexity of implementing keyboard and display functions in microcomputer systems by handling scanning, debouncing, and display refreshing tasks.

Applications

• Keyboard Interface: Interfaces keyboards to microcomputer systems for user input.
• Display Interface: Interfaces displays such as LEDs and LCDs to microcomputers for output.
• Industrial Control Panels: Used in industrial control panels for operator input and system status display.
• Instrumentation: Interfaces keypads and displays to instruments for control and readout.
• Point-of-Sale (POS) Systems: Provides keyboard and display interface for POS terminals.
• Embedded Systems: Offers keyboard and display interface for various embedded applications.

Features

• Scanned Keyboard Interface: Supports scanned keyboard with built-in debouncing.
• Scanned Display Interface: Supports scanned display with multiplexing.
• Sensor Matrix Interface: Can be used to interface with sensor matrices.
• Programmable Scan Rate: Allows adjusting the scan rate for optimal performance.
• Interrupt Capability: Generates interrupts for key presses or display updates.
• Single 5V Power Supply: Operates with a single 5V power supply.

Benefits

• Simplified Keyboard/Display Interface: Reduces the complexity of implementing keyboard and display functions.
• Reduced Processor Overhead: Offloads scanning, debouncing, and refreshing tasks from the processor.
• Flexible Configuration: Adapts to various keyboard and display requirements.
• Improved System Performance: Enhances overall system performance by optimizing keyboard and display handling.
• Cost-Effective Solution: Provides a cost-efficient way to implement keyboard and display interfaces.

Additional Details

The TMP82C79F-2 operates from a single 5V power supply and is typically packaged in a 40-pin DIP (Dual In-line Package). The device is programmed through an 8-bit data bus and control signals. The operating temperature range is typically from 0°C to 70°C. The device supports various display formats and keyboard configurations. The internal registers are used to configure display mode, keyboard mode, and scan rate. The device can generate interrupts upon key press or display updates, allowing the processor to respond efficiently to user input and display changes.