8088/8086 Instruction I

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LEA Destination SourceData Transfer <strong>Instruction</strong>s— Transfers the offset address of source (must be a memory location) to thedestination register— It does not modify flags XCHG Destination Source— It exchanges the content of destination and source— One operand must be a microprocessor register, the other one can be a registeror a memory location— It does not modify flags XLAT— Replace the data in AL with a data in a user defined look-up table— BX stores the beginning address of the table— At the beginning of the execution, the number in AL is used as theindex of the look-up table— It does not modify flags8-10
String <strong>Instruction</strong>s String is a collection of bytes, words, or long-words that can be up to 64KBin length String instructions can have at most two operands. One is referred to as sourcestring and the other one is called destination string— Source string must locate in Data Segment and SI register points to the currentelement of the source string— Destination string must locate in Extra Segment and DI register points to the currentelement of the destination stringDS : SI0510:00000510:00010510:00020510:00030510:00040510:00050510:000653484F50504552Source StringSHOPPERES : DI02A8:200002A8:200102A8:200202A8:200302A8:200402A8:200502A8:200653484F5050494ESHOPPINDestination String8-11
Page 1 and 2: ECE 424 Design of Microprocessor-Ba
Page 3 and 4: Addressing ModesAddressing Modes Im
Page 5 and 6: Flags Commonly Tested During the Ex
Page 7 and 8: What is a Stack ?Instructions for S
Page 9: Data Transfer Instructions SAHF—
Page 13 and 14: REPZ String InstructionRepeat Prefi
Page 15 and 16: String Instructions MOVSB (MOVSW)
Page 17: String Instructions SCASB (SCASW)

8088/8086 Instruction I

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