OCR Computing - Registers
- Created by: Denise24
- Created on: 09-03-14 12:57
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- Registers
- Registers
- Fast
- Temporary memory storage in the CPU
- 2 types
- Special/ Specific Purpose
- General Purpose
- ACC
- Holds data currently being processed
- Results of the processing are stored in the accumulator
- The results of arithmetic carried out in the ALU
- All I/O goes through the accumulator
- MAR
- Stores the memory address from which data will be fetched to the CPU or the address to which data will be sent and stored
- holds the memory location of data that needs to be accessed
- CIR/ IR
- Holds the instruction while it is being decoded/executed
- The contents of MDR are copied into the CIR if it is an instruction
- Operation code as first part of instruction
- Remainder of instruction is address of data to be used in operation or
- The data to be used if immediate operand is used
- Registers
- CIR/ IR
- Holds the instruction while it is being decoded/executed
- The contents of MDR are copied into the CIR if it is an instruction
- Operation code as first part of instruction
- Remainder of instruction is address of data to be used in operation or
- The data to be used if immediate operand is used
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