ADD loc16,#16bitSigned
6-29
ADD loc16,#16bitSigned Add Constant to Specified Location
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
ADD loc16,#16bitSigned 0000 1000 LLLL LLLL
CCCC CCCC CCCC CCCC
X − 1
Operands loc16 Addressing mode (see Chapter 5)
#16bit-
Signed
16-bit immediate signed constant value
Description Add the specified signed 16-bit immediate constant to the signed 16-bit
content of the location pointed to by the “loc16” addressing mode and
store the 16-bit result in the location pointed to by “loc16”:
[loc16] = [loc16] + 16bitSigned;
Smart Encoding:
If loc16 = AL or AH and #16bitSigned is an 8-bit number then the
assembler will encode this instruction as ADDB AX, #16bitSigned to
improve efficiency. To override this encoding, use the ADDW loc16,
#16bitSigned instruction alias.
Flags and
N
After the addition, if bit 15 of [loc16] is 1, then the N bit is set; else N cleared.
Modes
Z
After the addition, if [loc16] is zero, the Z is set, else Z 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 cleared.
Repeat This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Example ; Calculate:
; VarA = VarA + 10
; VarB = VarB − 3
ADD @VarA,#10 ; VarA = VarA + 10
ADD @VarB,#−3 ; VarB = VarB − 3
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