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Teachics

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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