03-07-2012, 04:24 PM
Real Time Embedded Systems
[attachment=26570]
Introduction
In the day-to-day life we come across a wide variety of consumer electronic products. We are habituated to use them easily and flawlessly to our advantage. Common examples are TV Remote Controllers, Mobile Phones, FAX machines, Xerox machines etc.
However, we seldom ponder over the technology behind each of them. Each of these devices does have one or more programmable devices waiting to interact with the environment as effectively as possible. These are a class of “embedded systems” and they provide service in real time. i.e. we need not have to wait too long for the action.
Definitions
Now we are ready to take some definitions
Real Time
“‘Real’-time usually means time as prescribed by external sources”
For example the time struck by clock (however fast or late it might be). The timings generated by your requirements. You may like to call someone at mid-night and send him a picture. This external timing requirements imposed by the user is the real-time for the embedded system.
Embedded (Embodiment)
“Embodied phenomena are those that by their very nature occur in real time and real space”
In other words, A number of systems coexist to discharge a specific function in real time
Thus “A Real Time Embedded System” (RTES) is precisely the union of subsystems to discharge a specific task coherently. Hence forth we call them as RTES. RTES as a generic term may mean a wide variety of systems in the real world. However we will be concerned about them which use programmable devices such as microprocessors or microcontrollers and have specific functions. We shall characterize them as follows.
[attachment=26570]
Introduction
In the day-to-day life we come across a wide variety of consumer electronic products. We are habituated to use them easily and flawlessly to our advantage. Common examples are TV Remote Controllers, Mobile Phones, FAX machines, Xerox machines etc.
However, we seldom ponder over the technology behind each of them. Each of these devices does have one or more programmable devices waiting to interact with the environment as effectively as possible. These are a class of “embedded systems” and they provide service in real time. i.e. we need not have to wait too long for the action.
Definitions
Now we are ready to take some definitions
Real Time
“‘Real’-time usually means time as prescribed by external sources”
For example the time struck by clock (however fast or late it might be). The timings generated by your requirements. You may like to call someone at mid-night and send him a picture. This external timing requirements imposed by the user is the real-time for the embedded system.
Embedded (Embodiment)
“Embodied phenomena are those that by their very nature occur in real time and real space”
In other words, A number of systems coexist to discharge a specific function in real time
Thus “A Real Time Embedded System” (RTES) is precisely the union of subsystems to discharge a specific task coherently. Hence forth we call them as RTES. RTES as a generic term may mean a wide variety of systems in the real world. However we will be concerned about them which use programmable devices such as microprocessors or microcontrollers and have specific functions. We shall characterize them as follows.