Consider the following statement regarding special purpose registers. (A) Program Counter (PC) keeps the track of next instruction executed (B) Instruction register holds the address of first instruction to be executed (C) Accumulator holds the output of ALU (D) Program Counter (PC) keeps the track of only first instruction of the program Choose the correct answer from the options given below :
(A) and (C) Only
A basic computer (Morris Mano) uses special purpose registers to control the instruction cycle: PC, IR and the accumulator AC among others.
(A) True — the Program Counter holds the address of the next instruction to be fetched; it is incremented (or loaded by a branch) during every instruction cycle.
(B) False — the Instruction Register holds the instruction being decoded and executed, not the address of the first instruction.
(C) True — the accumulator is the processor register that receives the result of ALU operations.
(D) False — the PC is updated for every instruction throughout the program, not just for the first instruction.
Combinations containing (B) or (D) include a false statement, so only (A) and (C) together are correct.
(A) and (C) Only option is correct.
Important Questions from General Register Organization
In the architecture of 8085 microprocessor match the following:
A. Processing unit
I. Interrrupt
B. Instruction unit
II. General purpose Register
C. Storage and Interface unit
III. ALU
IV. Timing and Control
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