| 1. | Which one of the following is not a vectored interrupt ? | |
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INTR
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TRAP
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RST 4.5
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RST 7.5
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Report Question| 2. | The number of bits needed to address 4K memory is ? | |
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6
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8
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12
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16
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| 3. | When the 8051 is reset and the line in HIGH, the program counter points to the first program instruction in the ? | |
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internal code memory
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external code memory
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internal data memory
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external data memory
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| 4. | Which instruction in an 8085 processor can clear the accumulator 8085 ? | |
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MOV B, C
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XRA A
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STA 2000H
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JNZ 2100H
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| 5. | DMA channel data facilitates data to move into and out of the system ...... ? | |
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on first come first serve basis
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without program intervention
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without subroutine
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with equal time delay
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| 6. | Which among the following are level triggering interrupts ? | |
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RST 6.5 and RST 5.5
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RST 7.5 and RST 6.5
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RST 5.5 and RST 7.5
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INTR and RST 7.5
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| 7. | In a microprocessor ? | |
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One machine cycle is equal to one clock cycle
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One clock cycle consists of several machine cycles
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One machine cycle consists of several clock cycles
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One machine cycle is always less than one clock cycle
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| 8. | Program counter of a 8085 holds the address of ? | |
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ALU for next operation
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Flag register to be change after ALU operation
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Instruction to be executed to be executed next
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Temporary registers to be used next
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| 9. | Which of the following instructions have only one operand ? | |
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Multiply
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Add
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Shift
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Subtract
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| 10. | In the register indirect addressing mode of 8085 microprocessor, data is stored Register ? | |
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at the address contained in the register pair
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in the register pair
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in the accumulator
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in a fixed location of the memory
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