Microprocessor - 8085 Control Instructions


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Following is the table showing the list of Control instructions with their meanings.

Opcode Operand Meaning Explanation
NOP None No operation No operation is performed, i.e., the instruction is fetched and decoded.
HLT None Halt and enter wait state The CPU finishes executing the current instruction and stops further execution. An interrupt or reset is necessary to exit from the halt state.
DI None Disable interrupts The interrupt enable flip-flop is reset and all the interrupts are disabled except TRAP.
EI None Enable interrupts The interrupt enable flip-flop is set and all the interrupts are enabled.
RIM None Read interrupt mask This instruction is used to read the status of interrupts 7.5, 6.5, 5.5 and read serial data input bit.
SIM None Set interrupt mask This instruction is used to implement the interrupts 7.5, 6.5, 5.5, and serial data output.
microprocessor_8085_instruction_sets.htm
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