8051 / 8052
Microcontroller - Instruction
Set
ADD, ADDC - Add Accumulator,
Add Accumulator with Carry
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Operation: |
ADD, ADDC |
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Function: |
Add Accumulator, Add Accumulator With Carry |
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Syntax: |
ADD A,operand |
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ADDC A,operand |
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Instructions |
OpCode |
Bytes |
Cycles |
Flags |
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ADD A,#data |
0x24 |
2 |
1 |
C, AC, OV |
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ADD A,iram addr |
0x25 |
2 |
1 |
C, AC, OV |
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ADD A,@R0 |
0x26 |
1 |
1 |
C, AC, OV |
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ADD A,@R1 |
0x27 |
1 |
1 |
C, AC, OV |
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ADD A,R0 |
0x28 |
1 |
1 |
C, AC, OV |
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ADD A,R1 |
0x29 |
1 |
1 |
C, AC, OV |
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ADD A,R2 |
0x2A |
1 |
1 |
C, AC, OV |
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ADD A,R3 |
0x2B |
1 |
1 |
C, AC, OV |
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ADD A,R4 |
0x2C |
1 |
1 |
C, AC, OV |
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ADD A,R5 |
0x2D |
1 |
1 |
C, AC, OV |
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ADD A,R6 |
0x2E |
1 |
1 |
C, AC, OV |
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ADD A,R7 |
0x2F |
1 |
1 |
C, AC, OV |
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Instructions |
OpCode |
Bytes |
Cycles |
Flags |
|
ADDC A,#data |
0x34 |
2 |
1 |
C, AC, OV |
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ADDC A,iram addr |
0x35 |
2 |
1 |
C, AC, OV |
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ADDC A,@R0 |
0x36 |
1 |
1 |
C, AC, OV |
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ADDC A,@R1 |
0x37 |
1 |
1 |
C, AC, OV |
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ADDC A,R0 |
0x38 |
1 |
1 |
C, AC, OV |
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ADDC A,R1 |
0x39 |
1 |
1 |
C, AC, OV |
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ADDC A,R2 |
0x3A |
1 |
1 |
C, AC, OV |
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ADDC A,R3 |
0x3B |
1 |
1 |
C, AC, OV |
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ADDC A,R4 |
0x3C |
1 |
1 |
C, AC, OV |
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ADDC A,R5 |
0x3D |
1 |
1 |
C, AC, OV |
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ADDC A,R6 |
0x3E |
1 |
1 |
C, AC, OV |
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ADDC A,R7 |
0x3F |
1 |
1 |
C, AC, OV |
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Description:
Description:
ADD and
ADDC
both add
the
value
operand
to the
value of
the
Accumulator,
leaving
the
resulting
value in
the
Accumulator.
The
value
operand
is not
affected.
ADD and
ADDC
function
identically
except
that
ADDC
adds the
value of
operand
as well
as the
value of
the
Carry
flag
whereas
ADD does
not add
the
Carry
flag to
the
result.
The
Carry
bit (C)
is set
if there
is a
carry-out
of bit
7. In
other
words,
if the
unsigned
summed
value of
the
Accumulator,
operand
and (in
the case
of ADDC)
the
Carry
flag
exceeds
255
Carry is
set.
Otherwise,
the
Carry
bit is
cleared.
The
Auxiliary
Carry
(AC)
bit is
set if
there is
a
carry-out
of bit
3. In
other
words,
if the
unsigned
summed
value of
the low
nibble
of the
Accumulator,
operand
and (in
the case
of ADDC)
the
Carry
flag
exceeds
15 the
Auxiliary
Carry
flag is
set.
Otherwise,
the
Auxiliary
Carry
flag is
cleared.
The
Overflow
(OV)
bit is
set if
there is
a
carry-out
of bit 6
or out
of bit
7, but
not
both. In
other
words,
if the
addition
of the
Accumulator,
operand
and (in
the case
of ADDC)
the
Carry
flag
treated
as
signed
values
results
in a
value
that is
out of
the
range of
a signed
byte
(-128
through
+127)
the
Overflow
flag is
set.
Otherwise,
the
Overflow
flag is
cleared.
See Also:
SUBB,
DA,
INC,
DEC,
Instruction
Set
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