OR loc16,#16bit
6-262
OR loc16,#16bit Bitwise OR
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
OR loc16,#16bit 0001 1010 LLLL LLLL
CCCC CCCC CCCC CCCC
X − 1
Operands loc16 Addressing mode (see Chapter 5)
#16bit 16-bit immediate constant value
Description Perform a bitwise OR operation on the content of the location pointed to by
the “loc16” addressing mode and the 16-bit immediate constant value. The
result is stored in the location pointed to by “loc16”:
[loc16] = [loc16] OR 16bit;
Smart Encoding:
If loc16 = AH or AL and #16bit is an 8-bit number, then the assembler will
encode this instruction as ORB AX, #8bit to improve efficiency. To override
this encoding, use the ORW AX, #16bit instruction alias.
Flags and
Modes
N
After the operation if bit 15 of [loc16] 1, set N; otherwise, clear N.
Z
After the operation if [loc16] is zero, set Z; otherwise, clear Z.
Repeat This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Example
; Set Bits 4 and 7 of VarA:
; VarA = VarA OR #(1 << 4 | 1 << 7)
OR @VarA,#(1 << 4 | 1 << 7) ; Set bits 4 and 7 of VarA
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