Connect a push button to the INTR pin via the 8259. Write an ISR that increments a counter displayed on a 7-segment display. Hall walks you through the "Interrupt Acknowledge" cycle—a concept that Android developers never touch, but firmware engineers live by.
Keywords integrated: Microprocessors And Interfacing Douglas V Hall 3rd Edition, 8086 interfacing, 8255 PPI programming, memory address decoding, assembly language programming, embedded systems fundamentals, McGraw-Hill microprocessor textbook. Microprocessors And Interfacing Douglas V Hall 3rd Edition
Enhanced diagrams and timing charts to better illustrate complex signal interactions. Updated Exercises: Connect a push button to the INTR pin via the 8259
Inclusion of comparisons between different microcomputer architectures and their respective trade-offs. Intended Audience This book is a standard reference for: 8255 PPI programming