Texas Instruments TMS320C28x Reference Manual page 185

ADD loc16, AX
ADD loc16, AX
SYNTAX OPTIONS
ADD loc16, AX
Operands loc16
AX
Description
Flags and N
Modes
Z
C
V
Repeat
Example
; Add the contents of VarA to index register AR0:
MOV
ADD
; Add the contents of VarB to VarC:
MOV
ADD
6-28
Addressing mode (see Chapter 5)
Accumulator high (AH) or accumulator low (AL) register
Add the contents of the specified AX register (AH or AL) to the location
pointed to by the "loc16" addressing mode and store the results in location
pointed to by "loc16":
[loc16] = [loc16] + AX;
This is a read-modify-write operation.
After the addition, [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.
After the addition, [loc16] is tested for a zero condition. The zero flag bit is set if
the operation generates [loc16] = 0; otherwise it is cleared
If the addition generates a carry, C is set; otherwise C is cleared.
If an overflow occurs, V is set; otherwise V is not affected. Signed positive
overflow occurs if the result crosses the max positive value (0x7FFF) in the
positive direction. Signed negative overflow occurs if the result crosses the
max negative value (0x8000) in the negative direction.
This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
AL,@VarA
@AR0,AL
AH,@VarB
@VarC,AH
OPCODE
0111 001A LLLL LLLL
; Load AL with contents of VarA
; AR0 = AR0 + AL
; Load AH with contents of VarB
; VarC = VarC + AH
Add AX to Specified Location
OBJMODE RPT
X −
CYC
1