Difference between SIM and RIM instructions in 8085 microprocessor Last Updated : 12 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The SIM (Set Interrupt Mask) and RIM (Read Interrupt Mask) instructions are two instructions in the 8085 microprocessor that are used to control interrupts. These instructions are commonly used in embedded systems and other applications that require interrupt-driven processing. By selectively enabling or disabling interrupts, the microprocessor can control the flow of data and ensure that critical tasks are executed in a timely manner. The SIM and RIM instructions are important tools for managing interrupts and optimizing the performance of the microprocessor in various applications.What is Set Interrupt Mask (SIM) ?In 8085 Instruction set, SIM stands for “Set Interrupt Mask”. It is 1-Byte instruction and it is a multi-purpose instruction. The SIM instruction allows the microprocessor to selectively enable or disable interrupts by setting the appropriate bits in the Interrupt Mask Register (IMR). The IMR is a register that controls which interrupts are allowed to be processed by the microprocessor. The SIM instruction takes one byte as an operand and sets the corresponding bits in the IMR based on the value of the operand.Uses of SIM InstructionMasking/unmasking of RST7.5, RST6.5, and RST5.5Reset to 0 RST7.5 flip-flop.Perform serial output of data.Advantages of SIM InstructionInterrupt Control: SIM is also used for better hand control of the hardware interrupts with this microprocessor comes with the ability to mask or unmask needed interrupts depending on the application.Flexibility in Masking: RST 7. 5, RST 6. 5, AND RST 5. 5 can be masked individually by SIM to meet the requirements of the interrupt system.Serial Data Transmission: SIM also has an application in serial output thus implements controlling the serial communication feature of the 8085 microprocessor.Disadvantages of SIM InstructionComplexity: SIM instruction usage entails a correct application of interrupt of the 8085 and it may be slightly time-consuming for the beginner.Limited Scope: The SIM instruction only applies to hardware interrupts, for instances, the RST 7 interrupt. 5, RST 6. 5, and RST 5. 5 and also does not manage any other kind of interrupt.What is Read Interrupt Mask (RIM)?In 8085 Instruction set, RIM stands for “Read Interrupt Mask”. It is a 1-Byte multi-purpose instruction. The RIM instruction, reads the current value of the IMR and copies it to the accumulator. This allows the microprocessor to check which interrupts are currently enabled or disabled. The RIM instruction takes no operands and simply reads the value of the IMR. Uses of Read Interrupt Mask (RIM)To check whether RST7.5, RST6.5, and RST5.5 are masked or not.To check whether interrupts are enabled or not.To check whether RST7.5, RST6.5, or RST5.5 interrupts are pending or not.To perform serial input of data.Advantages of RIM InstructionInterrupt Status Monitoring: RIM also enables the user to check the status of the interrupt system in order to allow the micro processor accept interrupts that are enabled.Serial Input Monitoring: The RIM is enabled at reading serial input data with which it is ideal with a focus on a serial communication.Mask Status Checking: It can also read the mask status of specific interrupts which will assist in finding out what is wrong with the system or to even debug it.Disadvantages of RIM InstructionLimited Functionality: In particular, RIM only reads interrupts and does not control them in the proper sense of the word. Indeed it is combined with the SIM instruction for comprehensive handling of interrupt.No Interrupt Control: Unlike SIM RIM cannot enable or disable interrupts which makes it more or less of lesser capacity or ability as per the need of an item functioning.Difference between SIM and RIM instructions in 8085 microprocessor:Sr. No.Sim InstructionRim Instruction1SIM stands for Set Interrupt Mask.RIM stands for Read Interrupt Mask.2It is responsible for masking/unmasking of RST 7.5, RST 6.5 and RST 5.5.It checks whether RST 7.5, RST 6.5, RST 5.5 are masked or not.3It resets to 0 RST 7.5 flip flop.It checks whether interrupts are enabled or not and to check whether RST 7.5, RST 6.5 or RST 5.5 interrupts are pending or not.4The content of the Accumulator decides the action to be taken. So before executing the SIM instruction, it is mandatory to initialize Accumulator with the required value.The contents of the Accumulator after the execution of the RIM instruction provide this information. Thus, it is essential to look into the Accumulator contents after the RIM instruction is executed.5SIM instruction can be used for serial output of data.RIM instruction can be used for serial input of data.6Its opcode(in Hex) is 30.Its opcode(in Hex) is 20.7Takes a byte operandTakes no operand 8Sets the corresponding bits in the Interrupt Mask Register (IMR) based on the operandCopies the current value of the IMR to the accumulator9Enables or disables interrupts selectivelyReads the current interrupt status10 SIM instruction changes the contents of the IMRRIM instruction does not modify any registers or flags11SIM instruction is used for setting the mask register before an interrupt is enabledRIM instruction is used for reading the mask register during interrupt service routine 12SIM instruction affects the mask ability of the interrupts RIM instruction does not affect the mask ability of the interrupts ConclusionSIM and RIM instruction plays vital roll in controlling or monitoring the interrupt system in 8085 micro-processor. Whereas, SIM enables users to encode and selectively disable particular interrupts, RIM is used to test the status of these interrupts. Both are needed in interrupt handling since the ability to control an interrupt at software level is important in systems that demands tight control over the interrupt signals sensed by the hardware. SIM provides possibilities to control the interrupts and serial output while RIM targets checking the interrupt and serial input state. Altogether the interfacing of these videos give a clear picture of interrupt control and communication mechanism of 8085 microprocessor. 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