The Instruction Register (IR) a. Stores flags b. Holds instruction addresses c.
ID: 3824794 • Letter: T
Question
The Instruction Register (IR) a. Stores flags b. Holds instruction addresses c. Is used in special address modes d. Stores op codes The Program counter (PC) a. Holds operand addresses b. Holds instruction addresses c. Holds data addresses d. Holds op codes The Data Address Register (DAR) a. Holds instruction addresses b. Holds operand addresses c. Holds Flags d. Holds op codes Which register partakes in many of the operations performed by ALU? a. Program counter b. Instruction register c. Data address register d. Accumulator Which of the following are not typical uses of the MPU's general-purpose registers? a. Sometimes used as index registers b. Holds address of next available c. Temporary storage d. Counters During conditional branch instructions, the contents of which register are examined to determine the next sequence of instructions to be performed? a. Index register b. Data address register c. Condition code register d. Instruction registerExplanation / Answer
1. b
It is a part of CPU s control unit holds the instruction currently being executed or decoded.
2.b
The PC holds the address of the current instruction being executed.
3.b
Memory address register. In a computer, the Memory Address Register (MAR) is the CPU register that either stores the memory address from which data will be fetched to the CPU or the address to which data will be sent and stored. In other words, MARholds the memory location of data that needs to be accessed.
4.D
Accumulator. It is a register that is similar to the general purpose register. It holds data or the results of an operation during the processing cycles. The accumulator can hold one of the two operands during any ALU operation.
5. B
General Purpose register: when a program is suddenly stopped its state, at that time the value of the registers such as the program counter, instruction register or memory address register - may be saved into the general purpose registers, ready for recall when the program is ready to start again.
6.C --> condition code register
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