Microprocessor
A good assembly language programmer should use general purpose registers rather than memory in maximum possible ways for data processing. This is because:

 Data processing with memory requires more instructions in the program than that with registers
 Of limited set of instructions for data processing with memory
 Data processing with registers is easier than with memory
 Data processing with registers takes fewer cycles than that with memory

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Microprocessor
Program counter in a digital computer

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

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