Computer System Architecture - Basic Computer Organization and Design

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21. The addressing mode used in the instruction PUSH B is

  • Option : B
  • Explanation : Push is used to write into stack
    1. This is not direct we are not mentioning address here.
    2. It's not register indirect we are not mentioning register which contain address.
    3. It's not immediate we are not storing immediate value.
    So answer is (B) i.e. register addressing
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22. The process of fetching and executing instructions,one at a time, in order of increasing addresses is called

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23. The CPU of a Computer takes instruction from the memory and executes them. This process is called

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24. When a program is being executed in an 8085 microprocessor, its Program Counter contains

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25. When the HLT instruction of a 8085 micro-processor is executed, the microprocessor

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