8279 Programmable Keyboard/ Display Controller : Pin Description

TL;DR

The 8279 IC, known as the programmable keyboard display controller, allows communication between a keyboard and the central processing unit (CPU).

Transcript

hello friends in this video we will study about the 8279 ic which is known as the programmable keyboard display controller in this video we will study about the pin description of 8279 so let's start with our topic this ic8279 it is also known as the programmable keyboard display controller this controller it is designed by the intel that so that i... Read More

Key Insights

• 🎹 The 8279 IC is designed to facilitate communication between a keyboard and a CPU, allowing for the transfer of key functions.
• 😴 The pin diagram of the 8279 IC consists of various power supply, control, data transfer, and synchronization pins.
• 👨‍💼 The data bus lines enable the transfer of data between the 8279 IC and the CPU.
• 🐏 The interrupt request signal notifies the CPU when there is data available in the FIFO sensor RAM.
• 🫥 The scan lines and return lines help in scanning the keyboard matrix and detecting pressed keys.
• 🫠 The chip select signal determines whether the 8279 IC is selected for read/write operations.
• 🤩 The control and strobe input mode stores the status of pressed keys in the FIFO RAM.

Questions & Answers

Q: What is the main function of the 8279 IC?

The main function of the 8279 IC is to interface a keyboard with the CPU, allowing for the scanning of pressed keys and sending their functions to the CPU.

Q: How many pins does the 8279 IC have?

The 8279 IC has a total of 40 pins in its pin diagram.

Q: What is the purpose of the data bus lines in the 8279 IC?

The eight bi-directional data bus lines in the 8279 IC are used to transfer or receive data from the CPU.

Q: How does the interrupt request signal work in the 8279 IC?

The interrupt request signal in the 8279 IC goes high when there is data available in the FIFO sensor RAM, indicating that the microprocessor needs to handle the received data.

Summary & Key Takeaways

• The 8279 IC is designed by Intel to interface a keyboard with the CPU, allowing for the scanning of pressed keys and sending their associated functions to the CPU.

• The pin diagram of the 8279 IC consists of various pins for power supply connections, read lines, clock input, interrupt request, data bus lines, chip select signal, control signals, and output ports.

• The pin description explains the purpose of each pin, such as data transfer, generating internal timings, resetting the microprocessor, chip selection, data and command transfer, read/write operations, interrupt request, power supply connections, scan lines, and output display synchronization.