Question

Fill in the blanks

• Program = is a set of PEP9 instructions

  1. Program is assumed to reside in memory starting at ______________.                                                                                                                              2. Program Counter Register (PC) points to the memory location of containing the __________________________________.                                          3.PC register is therefore initialized to ____ in order to point to the ________ program instruction contained in memory

• Sequential Instruction Fetch, Decode and Execute Cycle

       4. (Instruction Fetch) Instruction currently pointed to by _______________is loaded from __________ into the Instruction Register (___), then

       5. The PC register is ___________ in order to point to the _______ instruction, then

       6. (Instruction Decode) The Instruction Specifier machine code is ___________, then

       7. (Instruction Execute) The Instruction then ____________, then

       8 .Loop back to step ________ until a stop command is encountered.

Answer 1

Answers:-

1- secondary memory
2- instructions
3- address,next

4- memory address, pc register

5- incremented, next

6- fetched
7- is executed
8- step4

Explanation : PEP9 instruction is a machine level instruction used in computer A PC is a register that is for storing the next instruction of the cycle. different CPUs have different cycles though common one follows this step -> Fetch,Decode,Execute,Repeat. Fetch means next instruction is fetched which is to be executed,Decode means instruction is being decoded so that it can be executed and then at the end this instruction is being executed . this processes is repeated until all of our instructions are executed.