OR loc16, AX
6-263
OR loc16, AX Bitwise OR
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
OR loc16, AX 1001 100A LLLL LLLL X − 1
Operands loc16 Addressing mode (see Chapter 5)
AX Aaccumulator high (AH) or accumulator low (AL) register
Description Perform a bitwise OR operation on the contents of location pointed to by the
“loc16” addressing mode with the specified AX register. The result is stored
in the addressed location specified by “loc16”:
[loc16] = [loc16] OR AX;
This instruction performs a read-modify-write operation.
Flags and
Modes
N
The load to [loc16] is tested for a negative condition. If bit 15 of [loc16] is 1,
then the negative flag bit is set; otherwise it is cleared.
Z
The load to [loc16] is tested for a zero condition. The zero flag bit is set if the
operation generates [loc16] = 0, otherwise it is cleared.
Repeat This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Example
; OR the contents of VarA with VarB and store in VarB:
MOV AL,@VarA ; Load AL with contents of VarA
OR @VarB,AL ; VarB = VarB OR AL
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