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Von moonem
Von Neumann architecture is the design upon which many general purpose computers are based. The key elements of Von Neumann architecture are:
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the processor decodes and executes an instruction, before cycling around to fetch the next instruction
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A processor based on Von Neumann architecture has five special registers which it uses for processing:
program counter - holds the memory address of the next instruction to be fetched from primary memory
memory address register (MAR) - holds the address of the current instruction that is to be fetched from memory, or the address in memory to which data is to be transferred
memory data register (MDR) - holds the contents found at the address held in the MAR, or data which is to be transferred to primary memory
current instruction register (CIR) - holds the instruction that is currently being decoded and executed
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Using the registers and the key elements of the Von Neumann architecture, we can now look at how an instruction is processed in the fetch-decode-execute cycle.
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embedded systems 
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