Summary
This tutorial explains the use of interrupts in the AVR Atmega32A microcontroller, highlighting how interrupts temporarily suspend the main program to execute an interrupt service routine (ISR). It covers both hardware and software interrupts, focusing on a software interrupt example using the 16-bit Timer/Counter1. The project involves toggling an LED connected to the PB0 pin every second by generating periodic interrupts, demonstrating how interrupts enhance microcontroller functionality.Parts used in the AVR Atmega32A Interrupt Tutorial:
- AVR Atmega32A microcontroller
- Green LED
- 330Ω current limiting resistor
This tutorial is about how to use interrupt in AVR Atmega32A microcontroller. Interrupt enhances a use of microcontroller in many different ways. Interrupt is exactly the same as it means in English. Normally we expect a program to keep on executing sequentially in the way we have defined. When interrupt occurs the normal flow of instruction is temporarily suspended and interrupts service routine (ISR) related function or event is executed by program so basically whenever interrupt occurs in our program, we stop current task and handle the event then resume program flow back where we left off.
Interrupt in AVR Atmega32A Microcontroller is either software or hardware. There are in total 21 different interrupt vectors available (for more detail about their address and definition please follow datasheet page no: 43). External interrupts are triggered by INT0, INT1, INT2 pins. In this tutorial will be covering software interrupt. As in our previous post, we have seen timer and counter so let’s write interrupt driven program. In which we will be using 16-bit Timer/Counter1 register.
This is one of classic example to keep tutorial short and simple. Let’s hook up green LED and a current limiting resistor of 330Ω to PB0 pin of microcontroller. In this example, we will generate interrupt to toggle LED after every second. Please follow video for more detail about code.
Read More: Interrupt in AVR Atmega32A Microcontroller
