ZiLOG Z80-CPU Technical Manual page 58

Flags Op-Code
~
No.
Symbolic of
Mnemonic Operation C Z VS N H 76 543 210 Bytes
JP nn
PC"'nn
• •
•
• •
•
11 000 011 3
...
n
....
...
n
....
-
JP cc, nn
If condition cc
•
•
•
•
• •
11 cc 010 3
is true PC <-nn,
+-
n
....
otherwise
continue
...
n
....
JRe PC ... PC+e
. .
•
..
•
•
..
00 011 000 2
...
e-2
....
JRC,e
IfC = 0,
• • • •
• •
00 111 000
2
continue
...
e-2
....
IfC = I, 2
PC ... PC+e
JR NC, e IfC = I,
• • • •
• •
00 110000
2
continue
...
e-2
....
If C = 0,
2
PC ... PC+e
JRZ,e If Z
=
0
•
. .
•
..
•
..
00 101 000 2
continue
...
e-2
....
IfZ = I,
2
PC ... PC+e
JR NZ,e If Z = I,
•
..
-.
•
•
..
00 100 000
2
continue
-
e-2
....
IfZ = 0,
2
pe-PC+e
JP(HL) PC-HL
•
•
• • •
•
II 101 001 I
JP (IX) PC-IX
•
•
•
•
• •
II 011 101 2
11 101 001
JP (IV)
PC-IV
•
. . ..
• • •
II 111 101
2
11 101 001
DJNZ,e
B -B·I
• • • • • •
00 010 000 2
IfD
=
0,
- e-2
....
continue
IfD '" 0,
2
PC ... PC+e
Notes: e represents the extension in the relative addressing mode.
e is a signed two's complement number in the range <-126, 129>
e-2 in the op-code provides an effective address of pc +e as PC is
incremented by 2 prior to the addition of ~
No.
ofM
Cycles
3
3
3
2
3
2
3
2
3
2
3
I
2
2
2
3
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.
JUMP GROUP
TABLE 7.0-9
52
No.
ofT
States Comments
10
cc Condition
10 000 NZnon uro
001 Z zero
010 NCnon carry
011
C carry
100
PO parity odd
101 PE parity even
110 P sign positive
12 111 M sign negative
7 If condition not met
12 If condition
is
met
7 If condition not met
12
If condition is met
.
7 If condition not met
12
If condition is mel
7 If condition not mt'
12 If condition met
4
8
8
8 IfD = 0
13
IF D '" 0