ZiLOG Z80-CPU Technical Manual page 53

Flags
~
Symbolic
Mnemonic
Operation C Z V S N H
ADDA,r
A-A+r ~ ~ V ~ 0
t
ADDA,n A-A+n ~ ~ V ~ 0
t
ADD A, (HL)
A~·
A+ (HL)
~ t V .t 0
t
ADD A, (IX+d) A-A + (IX+d) t
t V
t
0
t
I
ADD A, (IY+d) A-A+(IY+d)
~ t
V
*
0
*
'ADC A,s
A-A+s+CY t ~
V
t 0
t
SUB s
A-A-s
t t V t
I t
SBC A,s A-A-s-CY t
t
V t
I
t
ANDs
A-A
A
s 0 t P
t 0
1
OR s A-A
V s 0 t P t 0 0
XORs
A-A"s
0
t
P t 0 0
CP s A - s t t V t I t
INCr
r '": r+ I
•
I
V
t 0 t
INC (HL)
(HL) - (HL)+ I
•
I
V t 0
t
INC (IX+d)
(IX+d) -
•
t
V t
0 I
(IX+d)+1
INC (IY+d) (IY+d) -
•
t
V I 0 t
(IY+d) + I
DECm m+-m-I
•
I
V
t I I
Op-Code
No.
of
76 543 210
Bytes
10
[QQQ)
r I
II
[QQQJ
110 2
-
n
-
10
[QQQJ
110
I
11 011 101 3
10
[QQQ]
110
-
d
-
II III 101 3
10
[QQQ]
110
-
d
-
@Q1J
IQIQ]
IillII
[[QQJ
!IIQJ
(j]JJ
IIill
00 r
[J]Q]
I
00 110
[J]Q]
I
II Oil 101
3
00 IIO[IQQ]
.
d
~
II III 101
3
00 '\1011001
-
d
.~
OJITJ
No. No.
ofM ofT
Cycles
States
I
4
2
7
2
7
5 19
5
19
I 4
3
II
6 23
6 23
Comments
r Reg.
000 B
001 C
010 D
Oil E
100 H
101 L
III A
sisanyofr,n,
(HL), (IX+d),
(IY +d) as shown f
or
ADD instruction
The indica ted bits
replace the 000 in
the ADD set abov e.
misanyofr,(H L),
(IX+d), (IY+d) as
shown for INC
Same format and
states as INC.
Replace 100 with
III I in OP codc.
Notes: The V symbol in the P/V flag column indicates that the P/V flag contains the overflow of the result of the
operatior.. Similarly the P symbol indicates parity. V = I means overtlow, V = 0 means not overl1ow. P = I
means parity of the result is even, P
=
0 means parity of the result is odd.
Flag Notation: • = flag not affected, 0
=
flag reset, I = tlag set, X = nag is unknown.
t
=
flag is affected according to the result of the operation.
8-BIT ARITHMETIC AND LOGICAL GROUP
TABLE 7.0-4
47