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Machine Control Instructions in 8085

These instructions affect the operation of the microprocessor. Halt and No operation are the two program control or machine control instructions.

Opcode Description
HLT Halt
1-byte instruction.
The processor stops executing and enters waiting state.
The address bus and databus are placed in high impedance state.
Register contents are not affected.
NOP No Operation
1-byte instruction.
No operation is performed.
Generally used to increase processing time or substitute in place of an instruction.
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