Computer System Architecture - Central Processing Unit
- Option : B
- Explanation : In Indexed addressing mode, the base address is already in the instruction i.e A and to fetch the index data from R0 no memory access is required because it’s a register So to fetch the operand only 1 memory cycle i s required. Indirect Addressing mode requires 2 memory cycles only
- Option : D
- Explanation : R1 ⇽ c, R2 ⇽ d, R2 ⇽ R1 + R2, R1 ⇽ e, R2 ⇽ R1-
R2
Now to calculate the rest of the expression we must load a and b into the registers but we need the content of R2 later. So we must use another Register.
R1 ⇽ a, R3 ⇽ b, R1 ⇽ R1 – R3, R1 ⇽ R1 + R2
- Option : A
- Explanation : I is true as by using multiple register windows, we eliminate the need to access the variable values again and again from the memory. Rather, we store them in the registers.
