Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the operand address.
 a short abbreviation for the operation to be performed.
 shorthand for machine language.
 a short abbreviation for the data word stored at the operand address.

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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 registers is easier than with memory
 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 takes fewer cycles than that with memory

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