About the Tutorial


What is Polling? ................................................................................................................................................53


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What is Polling? ................................................................................................................................................53
 
Interrupt Service Routine ..................................................................................................................................54
 
Interrupt Vector Table ......................................................................................................................................54
 
Steps to Execute an Interrupt ............................................................................................................................55
 
Edge Triggering vs. Level Triggering...................................................................................................................55
 
Enabling and Disabling an Interrupt ..................................................................................................................56
 
Interrupt Priority in 8051 ..................................................................................................................................57
 
Interrupt inside Interrupt ..................................................................................................................................57
 
Triggering an Interrupt by Software ..................................................................................................................57
 


Embedded Systems 

System 
A system is an arrangement in which all its unit assemble work together according to a set of 
rules. It can also be defined as a way of working, organizing or doing one or many tasks 
according to a fixed plan. For example, a watch is a time displaying system. Its components 
follow a set of rules to show time. If one of its parts fails, the watch will stop working. So we can 
say, in a system, all its subcomponents depend on each other. 

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