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Computer and Сomputer System Architecture (UWE – E.Merchan)
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After executing the following instructions:
MOV R0, #11001100B MOV A, R0 RL A RLC A RL A RLC A
What is the value in the accumulator?
Write your answer in XXH format (example: 5AH).
After executing the following instructions:
MOV A, #0FFH MOV B, #02H ADD A, B MOV R0, A MOV A, #7FH ADDC A, #01H
What is the value in the accumulator?
Write your answer in XXH format.
After executing the following instructions:
MOV A, #0F0H MOV R3, #0FFH XRL A, R3 XRL A, #55H
What is the value in the accumulator?
Write your answer in XXH format.
After executing the following instructions:
MOV A, #40H MOV B, #04H MOV R5, #10H ADD A, B ADD A, R5 RR A RR A
What is the value in the accumulator?
Write your answer in XXH format.
In 8-bit unsigned arithmetic, which instruction pattern correctly multiplies the accumulator by 16 while keeping only the low 8 bits of the result?
Why should user-initiated events often be assigned higher interrupt priority than periodic timers?
What is the role of the Global Interrupt Enable EA bit in the interrupt enable register?
In the STC89C52, which ALU-related hardware function is responsible for executing the MUL AB instruction?
In a daisy-chain interrupt system, which request is serviced?
After executing the following instructions:
MOV A, #0A5H CPL A RR A RR A RR A
What is the value in the accumulator?
Write your answer in XXH format.