Register Reference Instructions | Computer Science

Register Reference Instructions are those instructions that refer the registers to retrieve data from or to deposit data at. Copy the link given below and paste it in new browser window to get more information on Register Reference Instructions:- http://www.transtutors.com/homework-help/computer-science/computer-architecture/register-reference-instructions/

1. Register Reference Instructions

2. Definition of Register Reference Instructions Register Reference Instructions are those which refer registers instead of some memory address or memory location for data to operate on

3. How many are they? There are a total 12 register reference instructions in computer architecture that are in use and they are 1. CLA, 2. CMA, 3. CIL, 4. CIR, 5. INC, 6. SPA, 7. SNA, 8. SZA, 9. CLE, 10. CME, 11. SZE, 12. HLT Each instruction has its own functionality and all these register reference instructions operate on accumulator only

4. Functionality of all Register Reference Instructions SZE is used to Skip to some other memory location or instruction, if the result acquired is zero in the extended accumulator (E). SZA is used to skip to some other memory location or instruction if the result stored is zero in the accumulator (A). CMA is used to complement the value in the accumulator (A). SNA skips to some other location if the accumulator has a negative value. SPA states that skip to any other location that is specified if the value in the accumulator is positive.

5. Functionality (continued) INC is used to increment the value in the accumulator (A). CIL is used to circulate the accumulator leftwards. CIR is used to circulate the accumulator rightwards. CME complements the extended accumulator (E). CLE clears the extended accumulator (E) and to pace a zero in it. CLA clears the accumulator and in result it puts a zero in the accumulator. HLT halts the execution of the program.

6. Summary What is a Register Reference Instruction A list of all Register Reference Instructions Format of a Register Reference Instruction Functionality of all Register Reference Instruction

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