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

INSTRUCTION SET DESCRIPTIONSINCINSTable C-4. Instruction Set (Continued)Name Description OperationNOTE:Increment:INC destAdds one to the destination operand.The operand may be byte or a wordand is treated as an unsigned binarynumber (see AAA and DAA).Instruction Operands:INC regINC memIn String:INS dest-string, portPerforms block input from an I/O portto memory. The port address is placedin the DX register. The memoryaddress is placed in the DI register.This instruction uses the ES register(which cannot be overridden). After thedata transfer takes place, the DIregister increments or decrements,depending on the value of the directionflag (DF). The DI register changes by 1for byte transfers or 2 for wordtransfers.Instruction Operands:INS dest-string, portINS (repeat) dest-string, port(dest) ← (dest) + 1FlagsAffectedAF üCF –DF –IF –OF üPF üSF üTF –ZF ü(dest) ← (src) 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-18