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In a 8085 microprocessor after execution of ‘RIM’ instruction if the contents of accumulator is 49 H, then
- a)RST 7.5 is pending
- b)RST 6.5 masked
- c)Both 'a' and ‘b‘
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Explanation:
RIM (Read Interrupt Mask) instruction is used to read the contents of the interrupt mask register and load it into the accumulator. The interrupt mask register is a special register used to enable or disable interrupts of various types.
The interrupt system of the 8085 microprocessor has five interrupt types, namely RST 7.5, RST 6.5, RST 5.5, INTR and TRAP. Each interrupt type has a specific mask bit associated with it in the interrupt mask register. If the mask bit is set to 1, the corresponding interrupt is enabled, and if it is set to 0, the interrupt is disabled.
In the given question, after the execution of the RIM instruction, the contents of the accumulator are 49 H. The interrupt mask register is a 8-bit register, and the contents of the accumulator after the RIM instruction represent the mask bits in binary form.
To determine the status of the interrupt system after the RIM instruction, we need to convert the binary value of the accumulator contents to hexadecimal form and examine the mask bits for each interrupt type.
In this case, the binary value of the accumulator contents (49 H) is 01001001 in binary form. Examining the mask bits for each interrupt type, we find that:
- RST 7.5: mask bit is 0 (disabled)
- RST 6.5: mask bit is 1 (enabled)
- RST 5.5: mask bit is 0 (disabled)
- INTR: mask bit is 0 (disabled)
- TRAP: mask bit is 1 (enabled)
Therefore, we can conclude that RST 7.5 is pending, as its mask bit is 0 (disabled) and it has not been serviced yet. The fact that RST 6.5 is masked (enabled) does not affect the status of RST 7.5.
Hence, the correct answer is option 'A'.
RIM (Read Interrupt Mask) instruction is used to read the contents of the interrupt mask register and load it into the accumulator. The interrupt mask register is a special register used to enable or disable interrupts of various types.
The interrupt system of the 8085 microprocessor has five interrupt types, namely RST 7.5, RST 6.5, RST 5.5, INTR and TRAP. Each interrupt type has a specific mask bit associated with it in the interrupt mask register. If the mask bit is set to 1, the corresponding interrupt is enabled, and if it is set to 0, the interrupt is disabled.
In the given question, after the execution of the RIM instruction, the contents of the accumulator are 49 H. The interrupt mask register is a 8-bit register, and the contents of the accumulator after the RIM instruction represent the mask bits in binary form.
To determine the status of the interrupt system after the RIM instruction, we need to convert the binary value of the accumulator contents to hexadecimal form and examine the mask bits for each interrupt type.
In this case, the binary value of the accumulator contents (49 H) is 01001001 in binary form. Examining the mask bits for each interrupt type, we find that:
- RST 7.5: mask bit is 0 (disabled)
- RST 6.5: mask bit is 1 (enabled)
- RST 5.5: mask bit is 0 (disabled)
- INTR: mask bit is 0 (disabled)
- TRAP: mask bit is 1 (enabled)
Therefore, we can conclude that RST 7.5 is pending, as its mask bit is 0 (disabled) and it has not been serviced yet. The fact that RST 6.5 is masked (enabled) does not affect the status of RST 7.5.
Hence, the correct answer is option 'A'.
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In a 8085 microprocessor after execution of ‘RIM’ instruction if the contents of accumulator is 49 H, thena)RST 7.5 is pendingb)RST 6.5 maskedc)Both 'a' and ‘b‘d)None of the aboveCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In a 8085 microprocessor after execution of ‘RIM’ instruction if the contents of accumulator is 49 H, thena)RST 7.5 is pendingb)RST 6.5 maskedc)Both 'a' and ‘b‘d)None of the aboveCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a 8085 microprocessor after execution of ‘RIM’ instruction if the contents of accumulator is 49 H, thena)RST 7.5 is pendingb)RST 6.5 maskedc)Both 'a' and ‘b‘d)None of the aboveCorrect answer is option 'A'. Can you explain this answer?.
In a 8085 microprocessor after execution of ‘RIM’ instruction if the contents of accumulator is 49 H, thena)RST 7.5 is pendingb)RST 6.5 maskedc)Both 'a' and ‘b‘d)None of the aboveCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In a 8085 microprocessor after execution of ‘RIM’ instruction if the contents of accumulator is 49 H, thena)RST 7.5 is pendingb)RST 6.5 maskedc)Both 'a' and ‘b‘d)None of the aboveCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a 8085 microprocessor after execution of ‘RIM’ instruction if the contents of accumulator is 49 H, thena)RST 7.5 is pendingb)RST 6.5 maskedc)Both 'a' and ‘b‘d)None of the aboveCorrect answer is option 'A'. Can you explain this answer?.
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