The INTEL 8279 is a highly versatile programmable keyboard/display interface chip that combines both keyboard input and display output functionalities. It is designed to simplify the interaction between the user and the system by offering automatic keyboard scanning, which makes it ideal for use with matrix-based button or sensor configurations. This chip also features built-in debouncing capabilities, ensuring clean and accurate input signals even when multiple keys are pressed simultaneously.
When it comes to display output, the 8279 includes a 16×8-bit display RAM that can be used to store information for a digital LED display. The chip automatically scans this memory and updates the display using either an 8-bit or 16-bit LED tube, making it efficient for applications requiring real-time visual feedback.
Understanding the pin configuration of the 8279 is essential for proper integration into a circuit. Below is a detailed description of its key pins:
D0~D7: These are the data bus lines, which operate as a bidirectional tristate bus, allowing communication between the 8279 and other components in the system.
The internal block diagram of the 8279 provides a clear view of how these components interact. You can refer to the image below for a better understanding of its architecture.
Whether you're working on a simple control panel or a more complex embedded system, the Intel 8279 offers a reliable solution for managing both input and output operations efficiently and effectively.
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