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Given below are some statements associated with the registers of a CPU. Identify the false statement.
- a)The program counter holds the memory address of the instruction in execution.
- b)Only opcode is transferred to the control unit.
- c)An instruction in the instruction register consists of the opcode and the operand.
- d)The value of the program counter is incremented by 1 once its value has been read to the memory address register.
Correct answer is option 'A'. Can you explain this answer?
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Given below are some statements associated with the registers of a CPU...
Program counter contain the address of next instruction to be fetched but not address of executed instruction.
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Given below are some statements associated with the registers of a CPU...
Explanation:
Program Counter:
- The program counter holds the memory address of the next instruction to be fetched and executed, not the one currently in execution.
- It is a register that points to the memory address of the next instruction in the sequence.
Control Unit:
- The control unit receives the opcode and operand from the instruction fetched in the instruction register.
- It decodes the opcode to determine the operation to be performed by the CPU.
Instruction Register:
- An instruction in the instruction register consists of both the opcode (operation code) and the operand (data on which the operation is to be performed).
- The instruction register temporarily holds the current instruction being executed by the CPU.
Program Counter Increment:
- The value of the program counter is typically incremented by the size of the instruction once the current instruction's address has been loaded into the memory address register.
- The program counter is updated to point to the next instruction in memory.
Therefore, the false statement is option 'A' which states that the program counter holds the memory address of the instruction in execution. The program counter actually holds the address of the next instruction to be executed, not the current one.
Program Counter:
- The program counter holds the memory address of the next instruction to be fetched and executed, not the one currently in execution.
- It is a register that points to the memory address of the next instruction in the sequence.
Control Unit:
- The control unit receives the opcode and operand from the instruction fetched in the instruction register.
- It decodes the opcode to determine the operation to be performed by the CPU.
Instruction Register:
- An instruction in the instruction register consists of both the opcode (operation code) and the operand (data on which the operation is to be performed).
- The instruction register temporarily holds the current instruction being executed by the CPU.
Program Counter Increment:
- The value of the program counter is typically incremented by the size of the instruction once the current instruction's address has been loaded into the memory address register.
- The program counter is updated to point to the next instruction in memory.
Therefore, the false statement is option 'A' which states that the program counter holds the memory address of the instruction in execution. The program counter actually holds the address of the next instruction to be executed, not the current one.
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Given below are some statements associated with the registers of a CPU. Identify the false statement.a)The program counter holds the memory address of the instruction in execution.b)Only opcode is transferred to the control unit.c)An instruction in the instruction register consists of the opcode and the operand.d)The value of the program counter is incremented by 1 once its value has been read to the memory address register.Correct answer is option 'A'. Can you explain this answer?
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