Texas Instruments TMS320C28x Reference Manual page 188

ADDB AX, #8bitSigned
SYNTAX OPTIONS
ADDB AX, #8bitSigned
Operands AX
#8bit-
Signed
Description
Flags and
N
Modes
Z
C
V
Repeat
Example
; Add 2 to VarA and subtract 3 from VarB:
MOV AL,@VarA
ADDB
MOV @VarA,AL
MOV AL,@VarB
ADDB
MOV @VarB,AL
Accumulator high (AH) or accumulator low (AL) register
8-bit immediate signed 2s complement constant value (-128 to 127)
Add the sign extended 8-bit constant to the specified AX register (AH
or AL) and store the result in the AX register:
AX = AX + S:8bit;
After the addition, 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.
After the addition, AX is tested for a zero condition. The zero flag bit is set if
the operation results in AX = 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,#2
AL,#−3
OPCODE
1001 110A CCCC CCCC
; Load AL with contents of VarA
; Add to AL the value 0x0002 (2)
; Store result in VarA
; Load AL with contents of VarB
; Add to AL the value 0xFFFD (−3)
; Store result in VarB
ADDB AX, #8bitSigned
Add 8-bit Constant to AX
OBJMODE RPT CYC
X − 1
6-31