Chapter
3.
Instruction
Set
ADD
34
If
the carry bit
is
set to one, the instruction has the following results:
3DH
00111101
42H
01000010
CARRY
-
10000000 80H
Carry
0
Sign 1
Zero
0
Parity
0
Aux. Carry
ADD
The
ADD
instruction adds one byte
of
data to the contents
of
the accumulator. The result
is
stored
in
the
accumulator. Notice that the
ADD
instruction excludes the carry flag from the addition
but
sets the flag to
indicate the outcome
of
the operation.
Add
Register to Register
Opcode Operand
ADD
reg
The operand must specify one
of
the
registe~s
A through
E,
H or
L.
The instruction adds the contents
of
the
"pecified register to the contents of the accLmulator and stores the result
in
the accumulator.
Add
From Memory
11
0 0 0 0
Iss
sl
Cycles:
S ta tes:
Addressing:
Flags:
Op co de
ADD
Operand
M
4
register
Z,S,P,CY,AC
This instruction adds the contents
of
the
m-~mory
location addressed
by
the
Hand
L registers to the contents of
the accumulator and stores the result
in
the accumulator. M
is
a symbolic reference
to
the
Hand
L registers.
o 0 0 0
Cycles:
States:
Addressing:
Flags:
2
7
register indirect
Z,S,P,CY,AC
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