80C186EB/80C188EB Microprocessor User's Manual - CEUNES

INSTRUCTION SET DESCRIPTIONSTable C-4. Instruction Set (Continued)Name Description OperationFlagsAffectedLESLOCKNOTE:Load Pointer Using ES:LES dest, srcTransfers a 32-bit pointer variable fromthe source operand to the destinationoperand and register ES. The offsetword of the pointer is transferred to thedestination operand. The segmentword of the pointer is transferred toregister ES.Instruction Operands:LES reg16, mem32Lock the Bus:LOCKCauses the 8088 (configured inmaximum mode) to assert its busLOCK signal while the followinginstruction executes. The instructionmost useful in this context is anexchange register with memory.The LOCK prefix may be combinedwith the segment override and/or REPprefixes.Instruction Operands:none(dest) ← (EA)(ES) ← (EA + 2)AF –CF –DF –IF –OF –PF –SF –TF –ZF –none AF –CF –DF –IF –OF –PF –SF –TF –ZF –The three symbols used in the Flags Affected column are defined as follows:– the contents of the flag remain unchanged after the instruction is executed? the contents of the flag is undefined after the instruction is executedüthe flag is updated after the instruction is executedC-27