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fig4-27How does the processor know to get the required information from the external system?
An interrupt is an external or internal event that interrupts the
microcontroller to inform it that a device needs its service.

Interrupts vs. Polling
• A single microcontroller can serve several devices.
That are two ways to do that: interrupts or polling.
• The program which is associated with the interrupt is called the interrupt service routine (ISR) or interrupt handler

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1State Machine or Time sliced multi-tasking system


A state machine is recommended for most solutions where there is non time-critical tasks to perform. However, the time sliced multi-tasking is useful when:

   1. There is multiple tasks.
   2. Some of the tasks are low-priority, and can execute in the background, being interrupted by higher priority tasks. For example, low-frequency PWM with 300ms of mathematical calculations happening every 1 second.


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statemachinelogoControl systems that manage electrical or mechanical systems must often be able to generate, or respond to, sequential events in the system. This ability to use time as part of the driver equation is in fact one of the important abilities of a microcontroller that makes it such a good control for electrical and mechanical systems. However, implementing multiple sequences can become long and involved if a linear coding style is used.

A simple construct, called a state machine, simplifies the task of generating a sequence by breaking the sequence into a series of steps and then executing them sequentially. While this sounds like an arbitrary definition of a linear piece of code, the difference is that the individual sections, or steps in the sequence, are encoded within a SWITCH/CASE statement.

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