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CMC
(Complement
carry)
(CY)~
(CY)
The
CY flag
is
complemented.
No
other
flags
are
affected.
dress
is
specified in
byte
3
and
byte
2
of
the
current
instruction.
I
1
I
0
I
0
I
0
I
0
I
1
I
1
1
low-order
addr
high-order
addr
a , 0 ,
Cycles:
States:
Flags:
1
4
CY
Cycles:
States:
Addressing:
Flags:
3
10
immediate
none
STC
(Set
carry)
(CY)
~
1
The
CY flag
is
set
to
1.
No
other
flags
are
affected.
0
I
0
I
0
I
1
I
1
Cycles:
1
States:
4
Flags: CY
Jcondition
addr
(Conditional
jump)
If
(CCC),
(PC)
~
(byte
3)
(byte
2)
If
the
specified
condition
is
true,
control
is
trans-
ferred
to
the
instruction
whose
address
is
specified in
byte
3
and
byte
2
of
the
current
instruction;
other-
wise,
control
continues
sequentially.
"
1
I
1
I
C
I
C
I
C
I
0
I
1
I
0
low-order
addr
high-order
addr
Branch Group:
This
group
of
instructions
alter
normal
sequential
program flow.
Condition
flags
are
not
affected
by
any
instruction
in
this
group.
The
two
types
of
branch
instructions
are
uncondi-
tional
and
conditional.
Unconditional
transfers
simply per-
form
the
specified
operation
on
register PC
(the
program
counter).
Conditional
transfers
examine
the
status
of
one
of
the
four
processor flags
to
determi
ne if
the
specified
branch
is
to
be
executed.
The
conditions
that
may
be specified are
as follows:
~
1
I
1
I
0
I
0
I
1
T
1
I
0
I
1
low-order
addr
high-ord~r
addr
CALL
addr
(Call)
((SP) -
1)
~
(PCH)
((SP) -
2)
~
(PCl)
(SP)
~
(SP) - 2
(PC)
~
(byte
3)
(byte
2)
The
high-order
eight
bits
of
the
next
instruction
ad-
dress
are
moved
to
the
memory
location
whose
address
is
one
less
than
the
content
of
register SP.
The
low-order
eight
bits
of
the
next
instruction
ad-
dress
are
moved
to
the
memory
location
whose
address
is
two
less
than
the
content
of
register SP.
The
content
of
register SP
is
decremented
by
2. Con-
trol
is
transferred
to
the
instruction
whose
address
is
specified in
byte
3
and
byte
2
of
the
current
instruction.
3
10
immediate
none
Cycles:
States:
Addressing:
Flags:
CCC
000
001
010
011
100
101
110
111
NZ
-
not
zero
(Z
= 0)
2 - zero
(2
= 1)
NC
- no
carry
(CY = 0)
C -
carry
(CY =
1)
PO -
parity
odd
(P = 0)
PE -
parity
even (P =
1)
P - plus (S = 0)
M
-minus(S=1)
CONDITION
JMP
addr
(Jump)
(PC)
~
(byte
3)
(byte
2)
Control
is
transferred
to
the
instruction
whose
ad-
Cycles:
States:
Addressing:
Flags:
5
17
immediate/reg.
indirect
none
4-11