Question

20. Which of the instruction is used to selectively mask an interrupt?
a) DI
b) ET
c) SIM
d) RIM​

Answer 1

Answer:

sIM

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Answer 2

SIM (c) is the correct answer.

• The 8085 microprocessor can be used to mask the interrupts of four hardware interrupts: INTR, RST 5.5, RST 6.5, and RST 7.5.
• We can mask 8085 interrupts at different levels.
• In addition to interrupt masking, interrupt masking on the 8085 microprocessor is the most important part of interrupts.
• SIM instructions are commonly used to mask or unmask hardware interrupts.
• When executed, the SIM instruction reads the contents of the accumulator and masks or unmasks the interrupt accordingly.
• Control word format is stored in the accumulator before executing a SIM instruction.
• The SIM instruction can also be used to send serial data over the processor's SOD line.
• SIM (c) is the correct answer.

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