Table 14, Jump, call, and return group, Table 14 lists all of the j – Zilog Z08470 User Manual
Page 69: Tive, or register indirect). in table 14, the
UM008007-0715
Jump, Call, and Return
Z80 CPU
User Manual
57
instructions begin on page 258.
Three types of Register Indirect jumps are also included. These instructions are imple-
mented by loading the register pair HL or one of the index registers IX or IY directly into
the Program Counter. This feature allows for program jumps to be a function of previous
calculations.
A Call is a special form of a jump in which the address of the byte following the call
instruction is pushed onto the stack before the jump is made. A return instruction is the
reverse of a call because the data on the top of the stack is popped directly into the Pro-
Table 14. Jump, Call, and Return Group
Condition
Un-
Cond. Carry
Non-
Carry
Zero
Non-
Zero
Parity
Even
Parity
Odd
Sign
Neg
Sign
Pos
Reg
B¹0
JUMP
JP
IMMED.
EXT.
nn
C3
n
n
D8
n
n
D2
n
n
CA
n
n
C2
n
n
EA
n
n
E2
n
n
FA
n
n
F2
n
n
JUMP
JR
RELATIVE
PC+e
18
e–2
38
e–2
30
e–2
28
e–2
20
e–2
JUMP
JP
Register
INDIR.
(HL)
EB
(IX)
DD
E9
(IY)
FD
E9
CALL
IMMED.
EXT.
nn
CD
n
n
DC
n
n
D4
n
n
CC
n
n
C4
n
n
EC
n
n
E4
n
n
FC
n
n
F4
n
n
Decrement B,
Jump If Non-Zero
DJNZ
RELATIVE
PC+e
10
e–2
Return
RE
REGISTER
INDIR.
(SP)
(SP+1)
C9
D8
D0
C8
C0
E8
E0
F8
F0
Return From
Interrupt
RETI
ED
4D
Return From Non-
Maskable
Interrupt
RETN
ED
45
Note: