Flag manipulation and processor control instructions Set

Posted By on September 15, 2014


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STRING MANIPULATION INSTRUCTIONS Set
AN INTRODUCTION TO INTERRUPTS

Flag manipulation and processor control instructions

These  instructions control the functioning of the available hardware inside the processor chip. These instructions are categorized into two types

  1. Flag manipulation instructions
  2. Machine control instructions

Flag manipulation instructions

The flag manipulation instruction directly modifies some of the flags of the 8086.
  1. CLC- clear carry flag.
  2. CMC- complement carry flag.
  3. STC- set carry flag.
  4. CLD- clear direction flag.
  5. STD- set direction flag.
  6. CLI- clear interrupt flag.
  7. STI- set interrupt flag.

Machine control instructions

The machine control instructions control the bus usage and the execution
  1. WAIT- wait for test input pin to go low.
  2. HLT- halt the process.
  3. NOP- no operation.
  4. ESC- escape to external device like NDP.
  5. LOCK- Bus lock instruction prefix.
STRING MANIPULATION INSTRUCTIONS Set
AN INTRODUCTION TO INTERRUPTS

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Posted by Akash Kurup

Founder and C.E.O, World4Engineers Educationist and Entrepreneur by passion. Orator and blogger by hobby

Website: http://world4engineers.com