ZiLOG Z80-CPU Technical Manual page 59

Flags
Op.(:ode
~
No.
No.
Symbolic of ofM
Mnemonic Operation C Z V S N H 76 543 210 Bytes Cycles
CALLnn (SP-I)+-PC H
• •
. . .. ..
..
II 001 101 3 5
(SP-2)+-PC L
+-
n
....
PC+-nn
+-
n
....
CALLcc, nn If condition
•
..
•
•
. .
..
II cc
100
3
3
cc is false ....
n
....
continue,
3 5
otheIWise
....
n
-+
same as
CALLnn
RET PCL <-(SP)
. . .. .. . . .. ..
11 001 001 I
3
PC H <-(SP+l)
RETcc
If condition
.. ..
•
..
.. ..
11 cc 000 1 I
cc is false
continue,
1
3
otheIWise
same as
RET
RETI Rllturn from
..
. .
•
.. .. ..
11 WI 101 2 4
interrupt
01 001 101
RETN
Return from
11 101 101 2
4
.. ..
..
.. ..
. .
non maskable
interrupt
01 000 101
RSTp
(SP.I)+-PC H
.. ..
.. . .
..
. .
11
t
III
1
3
(SP.2)+-PC L
PCH+-O
PCL .... P
Flag Notation: • = flag not affected, 0 = flag reset, 1 = flag set, X = flag is unknown
*
= flag
is
affected according to the result of the operation.
CAL.L. AND RETURN GROUP
TABLE 1.0·10
53
No.
ofT
States
Comments
17
10
If cc is false
17
If cc is true
10
5 If cc is false
11
If cc is true
cc
Condition
000 NZ non zero
001
Z zero
010
NC non carry
14
011
C carry
100 PO
parity odd
14
101 PE parity even
110
P sign positive
III
M sign negative
11
t P
.
000 OOH
001 08H
010 lOH
011 18H
100
20H
101 28H
110
30H
111. 38H