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Use of instruction register and program counter:
Q. What is the use of instruction register (IR) and program counter (PC)?
Ans: The instruction register (IR) holds the instruction that is at present being executed .Its output is available to the control circuits which produce the timing signals that control the various processing elements. The program counters PC which is used to keep track of the execution of the program. It has the memory address of the next instruction to be fetched and to execute.
What is Immediate addressing The data itself, beside the address, is given as the operand or operands of the instruction.
Q. Explain Register Addressing Mode? Operand can be a 16-bit register: Addressing Mode Description Example AX, BX, CX, DX, SI,
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