Microprocessor
Program counter in a digital computer

 Points the memory address of the next instruction to be fetched.
 Counts the number of times a subroutine is called.
 Counts the numbers of programs run in the machine.
 Counts the number of times the loops are executed.

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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

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

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