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

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

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Microprocessor
FPGA means

 Forward Parallel Gate Array
 Forward Programmable Gate Array
 Field Parallel Gate Array
 Field Programmable Gate Array

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Microprocessor
When referring to instruction words, a mnemonic is

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

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