Texas Instruments TMS320C28x Reference Manual page 421

ORB AX,#8bit
ORB AX,#8bit
SYNTAX OPTIONS
ORB AX, #8bit
Operands AX
#8bit
Description
Flags and N
Modes
Z
Repeat
Example
; Set bit 7 of VarA and store result in VarB:
MOV
ORB
MOV
6-264
0101 000A CCCC CCCC
Accumulator high (AH) or accumulator low (AL) register
8-bit immediate constant value
Perform a bitwise OR operation on the specified AX register with the 8-bit
unsigned immediate constant zero extended. The result is stored in AX:
AX = AX OR 0x00:8bit;
The load to AX is tested for a negative condition. If bit 15 of AX is 1, then the
negative flag bit is set; otherwise it is cleared.
The load to AX is tested for a zero condition. The zero flag bit is set if the
operation generates AX = 0, otherwise it is cleared.
This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
AL,@VarA
AL,#0x80
@VarB,AL
OPCODE
; Load AL with contents of VarA
; OR contents of AL with 0x0080
; Store result in VarB
Bitwise OR 8-bit Value
OBJMODE RPT CYC
X − 1