What is the role of SIM instruction?

In 8085 Instruction set, SIM (Set Interrupt Mask) and RIM (Read Interrupt Mask) instructions can perform mask and unmask RST7. 5, RST6. 5, and RST5. 5 interrupt pins and can also read their status.

What is the difference between RIM and SIM?

RIM instruction means Read Interrupt Mask which is used to read the status of interrupts which are pending or yet to be executed. SIM means Set Interrupt Mask which is used to set those interrupts. In both the cases the operation is done through the accumulator only. Here’s and insight to the process.

What is EI instruction in microprocessor?

Enable Interrupt (EI) – The interrupt enable flip-flop is set and all interrupts are enabled following the execution of next instruction followed by EI. No flags are affected. After a system reset, the interrupt enable flip-flop is reset, thus disabling the interrupts.

What is SIM mask?

Mask (Sim) 19th–20th century A rectangular box with an arched forehead, it has two deeply hollowed channels in front. The sim mask usually appears as one of many different types of masks during a funerary ritual known as dama.

What is the purpose of SIM instruction explain with suitable example?

If MSE bit = 1, the SIM instruction is used for masking or unmasking of interrupts. Then the LS 3 bits provide information about masking or unmasking of interrupts.

What is meant by vectored interrupt also explain use of SIM instruction?

In a computer, a vectored interrupt is an I/O interrupt that tells the part of the computer that handles I/O interrupts at the hardware level that a request for attention from an I/O device has been received and and also identifies the device that sent the request.

What is the function of Sim instruction in 8085?

In 8085 Instruction set, SIM (Set Interrupt Mask) instructions can perform mask and unmask RST 7.5, RST 6.5, and RST 5.5 interrupt pins and can also read their status. When SIM instruction is executed then the content of the Accumulator decides the action to be taken.

What is HLT instruction in microprocessor?

In the x86 computer architecture, HLT (halt) is an assembly language instruction which halts the central processing unit (CPU) until the next external interrupt is fired. Most operating systems execute a HLT instruction when there is no immediate work to be done, putting the processor into an idle state.

What is true about SIM instruction?

This bit can have two values: 0or 1. If MSE bit = 0, SIM instruction is not being used for masking or unmasking of interrupts. In such a case, the LS 3bits of the Accumulator are not having any useful information. If MSE bit = 1, the SIM instruction is used for masking or unmasking of interrupts.

What is vector interrupt explain with an example?

In computer science, a vectored interrupt is a processing technique in which the interrupting device directs the processor to the appropriate interrupt service routine.

How many Byte instruction HLT has?

1-Byte instruction
In 8085 Instruction set, HLT is the mnemonic which stands for ‘Halt the microprocessor’ instruction. It is having a size of 1-Byte instruction. Using these particular instructions, as 8085 enters into the halt state, so we can put the8085 from further processing of next instructions.

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