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State use of control flags of 8086
written 7.4 years ago by gravatar for meghalikalyankar meghalikalyankar • 2.2k •   modified 3.4 years ago
microprocessors and applications
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written 7.4 years ago by gravatar for meghalikalyankar meghalikalyankar • 2.2k
  1. The 8086 has three control flags namely TF, IF and DF.
  2. All three of them can be user programmed to suit their needs.
  3. The trap flag allows the CPU to run in a single stepping mode. This comes in very handy in debugging and development purposes.
  4. The interrupt flag is used to causes the INTR to be enabled else it would remain disabled. Whenever the CPU is reset so is IF reset / cleared.
  5. In string operations primarily the Direction flag is used. The STD instruction is responsible for the setting of the DF.
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