Скачать или смотреть F-ch:11.1 4x4 Keypad Matrix with 8088 Microprocessor | Keyboard Scanning Using 82C55 PIA | Easy way

In this lecture, I explain how to connect a 4x4 Keypad Matrix to the 8088 microprocessor using the 82C55 Programmable Interface Adapter (PIA). I break down the circuit operation, address decoding with 16L8, pull-up resistors, and how the CPU detects a keypress.

✅ What You’ll Learn:
-How a 4×4 keypad matrix works
-Role of 82C55 PIA in interfacing
-Function of ports 50H–53H
-How the microprocessor scans keys
-The purpose of CS, A0, A1, RD, WR lines
-Pull-up resistors and VCC explained
-How to extend this to 2x8 or 8x2 keypads

📚 Based On:
-Book: Barry B. Brey – Microprocessor Systems
-Chapter 11: Basic I/O Interface
-Topic: Keyboard Scanning Procedure

💬 For Questions or Feedback:
Comment below! I’d love to hear your thoughts or help with your microprocessor project.

🔔 Don’t Forget to Subscribe
for more lectures on microprocessors.