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Q. Sequence of micro -operations to perform a specific function?
A digital system executes a sequence of micro-operations on data stored in registers or memory. Specific sequence of micro-operations performed is predetermined for an instruction. So an instruction is a binary code specifying a definite sequence of micro-operations to perform a specific function.
For illustration a C program instruction sum = sum + 7 will first be converted to equivalent assembly program:
(ADD R1, 7)
So several machine instructions may be required (this will differ from machine to machine) to execute a simple C statement. However how will every one of these machine statements be executed with the help of micro-operations? Let's try to explain the execution steps:
So we may have to execute instruction in several steps. For later discussion, for simplicity let's presume that every micro-operation can be completed in one clock period though some micro-operations need memory write/read which may take more time.
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