ADDB ACC,#8bit
6-30
ADDB ACC,#8bit Add 8-bit Constant to Accumulator
SYNTAX OPTIONS OPCODE OBJMODE RPT CYC
ADDB ACC,#8bit 0000 1001 CCCC CCCC X − 1
Operands
ACC Accumulator register
#8bit 8-bit immediate unsigned constant value
Description Add an 8-bit, zero-extended constant to the ACC register:
ACC = ACC + 0:8bit;
Flags and
Z
After the addition, the Z flag is set if ACC is zero, else Z is cleared.
Modes
N
After the addition, the N flag is set if bit 31 of the ACC is 1, else N 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.
OVC
If (OVM = 0, disabled) then if the operation generates a positive overflow, then
the counter is incremented and if the operation generates a negative overflow,
then the counter is decremented. If (OVM = 1, enabled) then the counter is not
affected by the operation.
OVM
If overflow mode bit is set; then the ACC value will saturate maximum positive
(0x7FFFFFFF) or maximum negative (0x80000000) if the operation
overflowed.
Repeat This instruction is not repeatable. If this instruction follows the RPT instruc-
tion, it resets the repeat counter (RPTC) and executes only once.
Example
; Increment contents of 32-bit location VarA:
MOVL ACC,@VarA ; Load ACC with contents of VarA
ADDB ACC,#1 ; Add 1 to ACC
MOVL @VarA,ACC ; Store result back into VarA
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