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Microprocessor

Microprocessor
The 8085 microprocessor uses a crystal of frequency 6.25 Mhz. The T-state value is

 1280ns
 640ns
 320ns
 960ns

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Microprocessor
I)A total of about one million bytes can be directly addressed by the 8086 microprocessor II)8086 has thirteen 16-bit registers III)8086 has eight flags IV)Compared to 8086, the 80286 provides a higher degree of memory protection Which one of the statements given above are correct?

 1,3 &4
 1,2 & 4
 2,3&4
 1,2 & 3

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Microprocessor
When any data transfer instruction, to transfer the data from memory to microprocessor, is executed the condition flags are

 affected indicating specific conditions
 always set
 not affected
 always reset

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Microprocessor
Which one of the following instruction may be used to clear the accumulator content irrespective of its initial value?

 ORA A
 MOV A, 00H
 CLR A
 SUB A

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Microprocessor
The five flags in 8085 are designated as

Z, CY, S, P and AC
D, Z, S, P, AC
Z, CY, S, D, AC
Z, C, S, P, AC

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Microprocessor
Which one of the following statement is false?

 A microprocessor has bi-directional data bus
 A microprocessor has an ALU
 A microprocessor has unidirectional address bus
 A microprocessor has bi-directional address bus

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