1. Control Instructions By Dr. S. N. Sampat, Team leader Ms. R. P
Control Instructions By Dr. S. N. Sampat, Team leader Ms. R. P. Merchant, Member Mr. A. K. Bilakhia, Member RC-1093 , Group-004, Domain-Electrical and Allied branches Team for OER creation IDP in Educational Technology, IIT Bombay
Four-Week ISTE STTP on Use of ICT in Education for Online and Blended Learning

2. Learning Objectives for Machine Control Instructions
Define Machine Control instruction to stop (halt) microprocessor from doing any operation.
Define status of hardware interrupts using machine control instruction
Define how to set hardware interrupt using machine control instruction
Define instruction to introduce small delay of 4 T states i.e. no operation using machine control instruction.
Four-Week ISTE STTP on Use of ICT in Education for Online and Blended Learning

3. Two-Week ISTE STTP on Technical Communication
Control Instructions
NOP
No operation
No operation is performed.
The instruction is fetched and decoded but no operation is executed.
Example: NOP
Two-Week ISTE STTP on Technical Communication

4. Two-Week ISTE STTP on Technical Communication
Control Instructions
HLT
Halt
The CPU finishes executing the current instruction and halts any further execution.
An interrupt or reset is necessary to exit from the halt state.
Example: HLT
Two-Week ISTE STTP on Technical Communication

5. Two-Week ISTE STTP on Technical Communication
Control Instructions
RIM
Read Interrupt Mask
This is a multipurpose instruction used to read the status of interrupts 7.5, 6.5, 5.5 and read serial data input bit.
The instruction loads eight bits in the accumulator with the following interpretations.
Example: RIM
Two-Week ISTE STTP on Technical Communication

6. Two-Week ISTE STTP on Technical Communication
Control Instructions
RIM INSTRUCTION
Two-Week ISTE STTP on Technical Communication

7. Two-Week ISTE STTP on Technical Communication
Control Instructions
SIM
Set Interrupt Mask
This is a multipurpose instruction and used to implement the 8085 interrupts 7.5, 6.5, 5.5, and serial data output.
The instruction interprets the accumulator contents as follows.
Example: SIM
Two-Week ISTE STTP on Technical Communication

8. Two-Week ISTE STTP on Technical Communication
Control Instructions
SIM Instruction
Two-Week ISTE STTP on Technical Communication

9. OER on 8085 microprocessor Instruction set
Thank you all
OER on 8085 microprocessor Instruction set