4 Processor Fundementals

Question 1

ALU

Answer 1

Arithmetic and Logic Unit, a component of the processor that carries out all arithmetic and logical operations.

Question 2

CU

Answer 2

Control Unit. component of the CPU that ensures synchronization of data flow and program instructions by sending control signals along the control bus

Question 3

System Clock

Answer 3

component of the CPU that produces timing signals on the control bus to ensure synchronization takes place

Question 4

IAS

Answer 4

Immediate Access Store. component of the CPU that holds all data and programs that the CPU needs to access (another name for the RAM)

Question 5

ACC

Answer 5

Accumulator. Temporary Register used when carrying out arithmetic operations

Question 6

CIR

Answer 6

Current Instruction Register. Stores current instruction being decoded and executed.

Question 7

MAR

Answer 7

Memory Address Register. Stores the address of the memory location currently being read from or written to

Question 8

PC

Answer 8

Program counter. A register that stores the address of where the next instruction to be read is found.

Question 9

MDR

Answer 9

Memory Data Register. Stores the data which have been just read from memory or about to be written to memory.

Question 10

IX

Answer 10

Index register. used when carrying out index addressing operations.

Question 11

SR

Answer 11

Status Register. contains bits that could be set or cleared depending on operation