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Q. Define the ADDRESSING MODES?
The elementary set of operands in 8086 can reside in memory, register and immediate operand. How can these operands be retrievedby various addressing modes? The answer to the question above is provided in the subsequent sub-section. Large number of addressing modes assists in addressing complex data structures with ease. A number of specific Terms and registers roles for addressing:
Base register (BX, BP): These registers are employed for pointing to base of a stack, array etc.
Index register (SI, DI): These registers are employed as index registers in data and/or extra segments.
Displacement: It signifies offset from the segment address.
Addressing modes of 8086
Mode
Description
Direct
Effective address is the displacement of memory variable.
Register Indirect
Effective address is the contents of a register.
[BX]
[SI]
[DI]
[BP]
Based
Effective address is the sum of a base register and a displacement.
LIST[BX]
(OFFSET LIST + BX)
[BP + 1]
Indexed
Effective address is the sumof an index register and a displacement.
LIST[SI]
[LIST +DI]
[DI + 2]
Based Indexed
Effective address is the sum of a base and an index register.
[BP + DI]
Based Indexed with
displacement
Effective address is the sum of a base register, an index register, and a displacement.
[BX + SI + 2]
Which Texts in the text elements of the program helps in changing the displayed names of variables in the parameters statement. Selection text in the elements of the program
Q. Feature of micro-instruction execution? Feature of micro-instruction execution is micro-instruction sequencing which involves address calculation of next micro-instruction.
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