Processors

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Types of registers

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Program counter

Memory Address Register

Memory Data Register

Current Instruction Register

Accumulator

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Holds the instruction while it's being decoded + executed. Contents of the MDR are copied to hre if it's an instruction.

Holds the address in memory of the location containing the next piece of data to be read/next instruction to be used.

Contents of the address specified in the MAR are copied to here. May be an instruction or data to be used with an instruction.

Stores address of next instruction. Controls the sequence in which instructions are executed. It's incremented after being read.

Holds data currently being processed. Results of processing and arithmetic carried out in the ALU are stored here.


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