11757531
Description
Mind Map by Jaya Sharma, updated more than 1 year ago
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Created by Jaya Sharma
about 8 years ago
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CPU registers
- Memory Address Register
(MAR)
- Stores the address in
memory from which
data will be fetched to
the CPU
- Or stores the address to
which data will be sent and
stored
- Stores the address in
memory from which
data will be fetched to
the CPU
- Memory Data Register
(MDR)
- Contents of the address specified in the MAR
are copied to the MDR
- This may be an operation or an
instruction
- Contents of the address specified in the MAR
are copied to the MDR
- Current Instruction Register
(CIR)
- Contents of the MDR are copied
to the CIR if it is an instruction
- Stores the current instruction waiting
to be decoded and executed
- Contents of the MDR are copied
to the CIR if it is an instruction
- Program Counter
(PC)
- Holds the memory address
of the next instruction
- Contains the address of the
instructions being executed
at the current time
- Holds the memory address
of the next instruction
- Accumulator
(ACC)
- Stores the results of calculations
- All 1/0 goes through the accumulator
- Stores the results of calculations
- A CPU register is a quickly
accessible location available to a
computer's CPU.
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