Microprocessor - 8085 Control Instructions
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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