ZiLOG eZ80

eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
146
EX (SP), IX/Y
Exchange Stack and Index Register
Operation
if ADL = 1 {
(SPL) ↔ IX/Y[7:0]
(SPL+1) ↔ IX/Y[15:8]
(SPL+2) ↔ IX/Y[23:16]
}
else if ADL = 0 {
SPS ↔ IX/Y[7:0]
(SPS+1) ↔ IX/Y[15:8]
}
Description
The CPU exchanges the contents of the multibyte Index Register, IX or IY, with the mem-
ory location specified by the Stack Pointer (
SP ). In ADL mode, or when the .L suffix is
employed, SPL is used for
SP . In Z80 mode, or when the .S suffix is employed, SPS is
used for
SP .
Condition Bits Affected
None.
Attributes
Mnemonic Operand ADL Mode Cycle Opcode (hex)
EX (SP),IX 0/1 6/8 DD, E3
EX.S (SP),IX 1 7 52, DD, E3
EX.L (SP),IX 0 9 49, DD, E3
EX (SP),IY 0/1 6/8 FD, E3
EX.S (SP),IY 1 7 52, FD, E3
EX.L (SP),IY 0 9 49, FD, E3