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Microprocessor

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

 B-C
 PSW
 Stack Pointer
 D-E

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Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 It has to fetch two 8-bit data at a time
 There are 16 address lines
 It facilitates the user storing 16-bit data temporarily
 It counts 16-bits at a time

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Microprocessor
In 8085, the pins for SID and SOD are

5 and 4 respectively
4 and 5 respectively
4 and 3 respectively
3 and 4 respectively

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Microprocessor
In an 8085 microprocessor based system, the contents of SP are 1000H, PUSH B instruction will transfer the contents of registers B & C respectively for memory locations

 1000 H and 0FFF H
 0FFF H and 0FFE H
 1000 H and 1001 H
 0FFE H and 0FFF H

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Microprocessor
How many machine cycles are required for execution of IN 30H instruction

 3
 5
 4
 6

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Microprocessor
In C the keywords are also called

Class words
Special words
Reserved words
Character words

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