Microprocessor
A microprocessor differentiates between op code, data/address at any time by

 the stack pointer
 the program counter
 the sequence in which memory contents are fetched by it
 its internal registers

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Microprocessor
Which of the following is not true during the execution of an interrupt service routine, which does not contain any EI instructions

 the microprocessor cannot be interrupted by any mask able interrupt
 all interrupts except non-maskable interrupt are disabled
 the microprocessor cannot be interrupted by any interrupt
 the microprocessor can be interrupted by a non-mask able interrupt

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