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(EX) I
NC
XL
XL= I 0 0 1 I 0 I 1
~
Ex.e
cu
te
I
, J
__
,
XL
= 0 0
1 1
1 0
~
Z=O , V=O C=O. H=
I)
•
@ DEC (DECrement)
T
he
\'al
ue
of
the accumulator or register is DECremented by on
e.
In
the case
of
the 8-
bit
reg
is
ter
(A.
RL.
RH).
it
mak
es
nag.
<
C.
V.
Hand Z chan
ged.
In the case
of
the 1
6-
bit
r
eg
i:;
le
r
Rrcg
.
no
nag
change
la
kt~
S
pl
ac
e.
•
Fo
rn1at •Operation
DF.C
A
(Operand) - I - (opcrnnd )
DEC
RI.
(C. V. H. and Z changed.)
DEC
RH
DEC R1·
eg
[O
pern
nd) - I - · (ope
rand
)
{EX)
D
EC
Xreg
XL
=
0 0 0 0 0 0 0 0
XL
= I t I I I t I t 1 I
Ex.e
cute
'-----------'·
-
XH
= 0
0
0
0
0 0 1
XH
= I 0 0 0 o o o o I
2-4-3. Compare and bit test
@ CPA (ComPare Ace)
l'he
co
ntents of the accuntulator arc cornparcd \Vith rtgist
er
or cx!crnal
n1en
1ory. and
itl'>
result is repr
ese
nted by nags c:.
V.
11.
and Z.
• l.-orn1at
CPA
RL
CPA
RH
C
PA
(
Rr
cg)
CPA ll(Rrt:g)
c r A
(ah)
C PA
11
("1>)
(EX
) CPA
XL
A-
lo
1
XL
Io
1
0
I
0
1
0
1
0 0
•O
peration
0
0
A - (opcrnnd] - cha
nge
in C. V. H. ;
rnd
7.
or
A + (operand] + I -· chan
ge
in
C.
V.
H.
an
d
7.
Comparison
I
c
z v H
- ·-
A> [operand)
0
* *
A= I operand)
1 1
*
*
A< [operand) 0 0
*
*
* :
Flags V and H rnay change according to lhe
condition me
nt
i
on
ed in ,;Status flag", but it has
no
meaning w
it
h t
he
CPA
instruction.
O l
Exec
ute
C- 1 • Z=O
ol
31
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