MCU programming keyboard and display interface

Single chip microcomputer STM32L151CCU6

1206RGB (single)

SMD LED Light Emitting Diode, SMD LED beads 0603, 0805

0201 package SLP0603 ESD electrostatic diode, 5V one-way ESD

Probe domestic switch needle KG-300K, needle head diameter 3.0mm, normally open switch needle

The INTEL 8279 is a versatile programmable keyboard/display interface chip that integrates both keyboard input and display output functionalities. It features automatic keyboard scanning, making it ideal for use with matrix button or sensor configurations. The chip automatically eliminates contact bounce and provides protection against multiple key presses at the same time, ensuring accurate input handling.

When used for display output, the 8279 includes a 16×8-bit display RAM, which can be scanned and displayed using an 8- or 16-bit LED digital tube. This makes it suitable for applications requiring dynamic character or numeric display outputs.

Pinout and Functionality of the 8279

The internal block diagram of the 8279 is illustrated below, showing its core components and signal flow.

D0~D7: These are the data bus lines, serving as a bidirectional tristate bus for communication between the 8279 and other system components.

Understanding the functionality of the 8279 helps in designing efficient input/output interfaces for various electronic systems. Whether you're working on a simple control panel or a more complex user interface, this chip offers reliable performance and ease of integration.