Interrupt Programming | Interrupt Configuration | Interrupt Service Routine | Interrupt Handler
Interrupt programming is a method where a processor temporarily halts its main execution to respond to high-priority signals or events. This is more efficient than polling, as it allows the CPU to perform other tasks until an event actually occurs.
Core Concepts
Interrupt Service Routine (ISR): A specific function that executes immediately when an interrupt is triggered.
Interrupt Vector Table (IVT): A memory structure storing the addresses (vectors) of various ISRs, allowing the CPU to find the correct handler.
Context Switching: The process of saving the current program state (registers and program counter) to the stack before jumping to an ISR, ensuring a safe return
What You’ll Learn:
What is a Timer Interrupt and why it’s used
How a Timer overflow generates an interrupt
Step-by-step setup of timer registers
Writing Embedded C code for timer interrupts
Real-time application examples using microcontrollers
Execution Flow
Request: A peripheral or software instruction sends a signal to the CPU.
State Save: The CPU completes its current instruction and pushes the program counter (PC) and status onto the stack.
ISR Jump: The CPU retrieves the ISR address from the IVT and transfers control to it.
Completion: The ISR finishes with a "Return from Interrupt" (RETI) instruction, restoring the previous state and resuming the main program.
⚙️ Topics Covered:
Timer initialization
Interrupt vector handling
ISR (Interrupt Service Routine)
Timer frequency and delay calculation
Practical demonstration
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