Interrupts in Microcontroller | what is an Interrupt | Interrupts in Embedded System

An interrupt is a hardware or software signal that temporarily pauses the microcontroller's current task to execute a specialized function called an Interrupt Service Routine (ISR). Once the ISR finishes, the microcontroller resumes its main program exactly where it left off Core Components Interrupt Request (IRQ): The incoming signal that triggers the interruption. Interrupt Service Routine (ISR): Code specifically written to handle a particular event (e.g., stopping a motor if a sensor detects heat). Interrupt Vector Table (IVT): A fixed memory map containing the addresses of all ISRs. Priority: A system that determines which event to handle first if multiple interrupts occur simultaneously. Types of Interrupts Hardware Interrupts: Triggered by external pins (e.g., button press) or internal peripherals (e.g., timer overflow). Software Interrupts: Triggered by specific instructions within the program or by errors like "divide by zero". Maskable vs. Non-Maskable: Maskable interrupts can be ignored or disabled by software; Non-Maskable Interrupts (NMI) are critical and cannot be ignored (e.g., power failure). Standard Execution Steps Current Instruction: The CPU finishes its current machine-level instruction. Context Saving: The current Program Counter (PC) and Status Register are saved to the Stack. Branching: The CPU jumps to the ISR address found in the Interrupt Vector Table. Service: The ISR code executes and concludes with a RETI (Return from Interrupt) instruction. Restore: The saved PC and status are "popped" from the stack, and the main program resumes. Polling vs. Interrupts Polling: The CPU constantly checks a status flag in a loop. This is inefficient as it wastes CPU cycles. Interrupt: The CPU only reacts when an event occurs, allowing it to perform other tasks or stay in a low-power mode until needed 💡 You’ll Learn: ✅ Definition and need of interrupts ✅ Hardware vs Software interrupts ✅ Interrupt vector table ✅ ISR execution process ✅ Interrupt priority Chapters:- 00:00 Introduction 00:40 What is an Interrupt 02:00 How Interrupt Mechanism works 05:43 ISR Interrupt Service Routine 06:15 Interrupt Controller 06:35 Interrupt Vector Table 07:05 Context Store 07:19 Context restore 07:40 Hardware Interrupts 07:58 Software Interrupts 08:20 External Interrupts 08:45 Internal Interrupts 09:03 Maskable Interrupts 09:20 Non Maskable Interrupts 09:42 Vectored Interrupts 10:12 Non vectored Interrupts 10:50 Fixed Priority 11:22 Dynamic Priority 11:55 Priority Masking 12:26 Round Robin Priority If you have any questions please write to us email: [email protected] Like, Share, and Subscribe for more tutorials on Embedded Systems and Microcontrollers. ------------------------------------------------------------------------------------------------------------------------------------------------------------- Your Questions:- Interrupts in PIC Microcontrollers What is Interrupt What is an interrupt and how is it handled in embedded C? What is meant by interrupt service routine? How To Enable External Interrupt Interrupt service routine in C What is ISR in microprocessor Interrupt service routine example Interrupt Service routine in embedded system Interrupt service routine diagram Interrupt vector table in ARM processor Interrupts in 8051 microcontroller What is interrupt service routine in operating system Microcontroller pin interrupts Interrupt handler Interrupts & How do they work? Interrupts in PIC Microcontrollers Microcontroller interrupt working What is a microcontroller Interrupt? Interrupts in Microcontrollers Programming serial communication interrupts Programming external hardware interrupts Understanding Interrupts in Embedded Systems All about Interrupts with Examples What does an interrupt vector table do? What is a vector table in a microprocessor? What is ISR and IVT? Where is interrupt vector table stored What is a vector table in a microprocessor? What is a vector interrupt? Interrupt Vector table Diagram Interrupt vector table example ------------------------------------------------------------------------------------------------------------------------------------------------------------- #interrupts #interruptvectortable #nvic #interruptserviceroutine #EmbeddedC #LPC1768#Microcontroller #EmbeddedSystems #32bitMCU ‪@KnowaboutEmbeddedSystem‬