| 1. | When the 8085 receives an interrupt on its INTR pin ? | |
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The program is directly transferred to a fixed call location
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8085 waits till an interrupt acknowledgement is received and transfers program to a fixed call location
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The call location is determined by an external device
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The program is transferred to a call location indicated by HL register pair
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Report Question| 2. | The first machine cycle of an instruction is always a ? | |
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Memory read cycle
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Fetch cycle
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I/O real cycle
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Memory write cycle
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| 3. | microprocessor 8085 is the enhanced version of ? | |
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6800
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68000
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8080
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8000
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| 4. | The synchronization between microprocessor and memory is done by ? | |
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READY signal
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ALE signal
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HOLD signal
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None of these
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| 5. | An instruction consisting of an operation code and operand address(es) is called ? | |
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Mnemonics
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Pseudo code
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Assembly language instruction
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Machine language instruction
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| 6. | To multiply a number by 8 in 8085 we have to use RAL instruction ? | |
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Once
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Twice
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Thrice
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Four times
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| 7. | In 8085 microprocessor with memory mapped I/O which of the following is true ? | |
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I/O devices have 16 bit addresses
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I/O devices are accessed during IN and OUT instructions/I/O
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There can be a maximum of 256 input and 256 output devices
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Logic operations can not be performed
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| 8. | Microcontroller contains ? | |
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What do the contents of instruction register specify
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Operand for the instruction being executed
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Opcode for the instruction being executed
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Operand for the instruction being executed
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| 9. | What do the contents of stack pointer (SP) specify ? | |
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Address of the bottom of stack
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Address of the top of stack
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contents of the bottom of stack
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contents of the top of stack
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| 10. | Maximum memory accessed by 8085 is ? | |
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64 MB
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64KB
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80 MB
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85 MB
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