Microprocessor
The stack pointer register in a microprocessor

 counts the number of programs being executing on the microprocessor
 holds the address of the top of the stack
 keeps the address of the next instruction to be fetched
 counts the number of instructions being executing on the microprocessor

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Microprocessor
In a vector interrupt

 the branch address is obtained from a register in the processor.
 the branch address is assigned to a fixed location in memory.
 the interrupting source supplies the branch information to the processor through an interrupt vector.
 none.

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Microprocessor
How can we make any bit of a register “1”?

 AND that bit with “1” and remaining bits with “0”.
 AND that bit with “0” and remaining bits with “1”.
 OR that bit with “0” and remaining bits with “1”.
 OR that bit with “1” and remaining bits with “0”.

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