02-03-2011, 04:41 PM
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EMBEDDED SECURITY SYSTEM IN AUTOMATED TELLER MACHINE
ABSTRACT:-
An embedded system can be defined as the computing device that has computer hardware, either with software embedded in it as one of its most important component. It may be an independent system or a part of a larger system. The emergence of embedded systems is a recent development. As a scientific discipline it resembles the state of microelectronics (and VLSI design, in particular) around 1980. Today’s challenge is similar to back then, except that the stakes are probably higher. Embedded systems will appear in virtually all devices, and intelligent devices have the tendency to oust their "stupid" counterparts from the market place, just like CD players have ousted gramophone players. Thanks to developments in microelectronics, the computing power of the desktop computers is now becoming available on the palmtops. Embedded systems are heterogeneous. Since they are mixtures of hardware and software, trade-off is important design decisions: do we realize a function in hardware or in software? But embedded systems are more heterogeneous than just combining computer science & digital electronics.
This paper presents an overview of existing modes of Embedded Systems, architecture & their application. A look has also been given to future deployment of Embedded Systems.
1. INTRODUCTION:-
An embedded system can be defined as the computing device that has computer hardware with software embedded in it as one of its most important component. It may be either an independent system or a part of a larger system. As its software usually embeds in ROM, it does not need secondary memories as in a computer. Nearly 99% of the processors manufactured end up in embedded systems. Embedded systems find applications in every industrial segment. Embedded systems can be categorized as stand-alone systems, real-time systems, networked information appliances & mobile devices. Just in the 10 years, such changes have occurred more rapidly that they see more revolutionaries than evolutionary. As these systems have brought about radical changes in Electronics and Computer, they have also begun to impact other human activities.
INTRODUCTIO TO EMBEDDED SYSTEM:-
An embedded system is some combination of computer hardware & software, either fixed in capability or programmable, that is specifically designed for a particular kind of application device. Hardware & software that forms a component of some larger system & is expected to function without human intervention. Typically an embedded system consists of a single-board microcomputer with software in ROM, which starts running a dedicated application as soon as power is turned on & does not stop until power is turned off. An embedded system is any device controlled by instructions stored on a chip. These devices are usually controlled by a microprocessor that executes the instructions stored on a Read Only Memory (ROM) chip. Here an example of a chip “PIC” is shown.
An embedded system is pre-programmed to perform a dedicated or narrow range of functions as part of a larger system, usually with minimal end-user or operator intervention. The term 'embedded' implies that these chips are an integral part of the system. Broadly speaking, these programmable devices or systems are generally used to perform, control or monitor processes, machinery, environments, equipment and communications tasks. Embedded systems have several things to do at once–respond to several events at once; cope with unusual conditions without human intervention, while being subjected to a deadline. In fact a general computer system is made up of numerous embedded systems. If an embedded system is designed well, the existence of the processor & the software
