Flag and Machine Control Instructions 8085

Flag Manipulation and a 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.

1. Flag Manipulation instructions
The Flag manipulation instructions directly modify the carry flag. These are

  1. STC – Set the carry Flag
  2. CMC – Complement the carry Flag

2. Machine Control instructions

The Machine control instructions control the bus usage and execution

  • HLT – Halt the process.
  • NOP – No operation.
  • DI     –  Disable Interrupt
  • EI     – Enable Interrupt


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