ADD AX, loc16
6-27
ADD AX, loc16 Add Value to AX
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
ADD AX, loc16 1001 010A LLLL LLLL X − 1
Operands AX Accumulator high (AH) or accumulator low (AL) register
loc16 Addressing mode (see Chapter 5)
Description Add the contents of the location pointed to by the “loc16” addressing mode to
the specified AX register (AH or AL) and store the result in the AX register:
AX = AX + [loc16];
Flags and
Modes
N
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.
Z
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.
C
If the addition generates a carry, C is set; otherwise, C is cleared.
V
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.
Repeat This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Example
; Add the contents of VarA with VarB and store in VarC
MOV AL,@VarA ; Load AL with contents of VarA
ADD AL,@VarB ; Add to AL contents of VarB
MOV @VarC,AL ; Store result in VarC
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