What is ISR?

ISR stands for "Interrupt Service Routine." An ISR (also termed an interrupt handler) is a software method requested by an intervention offer from a hardware method. It examines the application and assigns it to the CPU, disrupting the current method. While the ISR is concluded, the method is returned.

A primary instance of an ISR is a method that manages keyboard functions, such as holding or delivering a key. Every time a solution is compressed, the ISR prepares the information. For instance, if we compress and uphold the right arrow indicator in a document file, the ISR will indicate to the CPU that the right arrow key is pressed. The CPU transmits this data to the current word processor or document editing application, which will transfer the cursor to the right. When we let perform of the solution, the ISR examines the "key up" function. This prevents the prior "key down" position, which indicates the plan to stop relocating the cursor.