ZiLOG eZ80

eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
183
JP (IX/Y)
Jump Indirect
Operation
PC ← IX/Y
Description
The Program Counter is loaded with the contents of the specified Index Register, IX or IY.
Table 60 provides more detailed information on this instruction, particularly when switch-
ing between ADL and Z80 modes.
Condition Bits Affected
None.
Attributes
Table 60. JP (IX/Y) Instruction Detail
ADL Suffix Operation
0 None or
.S
The starting Program Counter is {MBASE, PC[15:0]}. Write the 2-byte
value stored in IX/Y[15:0] to PC[15:0]. The ADL mode bit remains
cleared to 0. The ending Program Counter is {MBASE,
PC[15:0]} = {MBASE, IX/Y[15:0]}.
1 None or
.L
The starting Program Counter is PC[23:0]. Write the 3-byte value stored
in IX/Y[23:0] to PC[23:0]. The ADL mode bit remains set to 1. The
ending Program Counter is PC[23:0] = IX/Y[23:0].
0 .L The starting Program Counter is {MBASE, PC[15:0]}. Write the 3-byte
value stored in IX/Y[23:0] to PC[23:0]. Set the ADL mode bit to 1. The
ending Program Counter is PC[23:0] = IX/Y[23:0].
1 .S The starting Program Counter is PC[23:0]. Write the 2-byte value stored
in IX/Y[15:0] to PC[15:0]. Reset ADL mode bit to 0. The ending Program
Counter is {MBASE, PC[15:0]} = {MBASE, IX/Y[15:0]}.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
JP (IX) 1 4 DD, E9
JP.S (IX) X 5 40, DD, E9
JP.L (IX) X 5 5B, DD, E9
JP (IY) 1 4 FD, E9