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Microprocessor

Microprocessor
Identify the communication interfacing device from the following

 8251
 8155
 8255
 8257

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Microprocessor
Consider the following registers: 1. Accumulator and flag register 2. B and C register 3. D and E register 4. H and L register Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16-bit register?

 1, 2 and 3
 1, 2 and 4
 1, 3 and 4
 2, 3 and 4

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Microprocessor
Which of the following is not treated as hexadecimal constant by assembler in 8085?

6 AFH
64 H
234
45 H

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Microprocessor
Which of the following conditions is not allowed in an RS latch?

R is negated, S is asserted
R is negated, S is negated
R is asserted, S is negated
R is asserted, S is asserted

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Microprocessor
Which of the following instruction will never affect the zero flag?

 XRA R
 ORA R
 DCX Rp
 DCR R

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Microprocessor
Which of the data transfer is not possible in microprocessor

 memory to memory
 I/O device to accumulator
 memory to accumulator
 accumulator to memory

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