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Microprocessor

Microprocessor
XCHG instruction exchanges the content of H-L with ______ register pair.

 PSW
 D-E
 Stack Pointer
 B-C

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Microprocessor
In a microcomputer , the address of memory locations are binary numbers that identify each memory circuit where a byte is stored. If a microcomputer uses 20-bit address, then numbers of different memory locations are

 220
 220 - 1
 20
 220-1

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Microprocessor
Which of the following is a valid integer constant?

125 + 3
127
127
127

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Microprocessor
In one’s complement 8 bit representation 11111111 represents

-0
+0
-1
1

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

 DCX Rp
 ORA R
 XRA R
 DCR R

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Microprocessor
In order to complement the lower nibble of accumulator one can use

 CMA
 XRI 0FH
 ANI 0FH
 ORI 0FH

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