ZiLOG eZ80

eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
276
PEA IY+d
Push Effective Address
Operation
if ADL mode{
(SPL – 1) ← IYd[23:16]
(SPL – 2) ← IYd[15:8]
(SPL – 3) ← IYd[7:0]
SPL ← SPL – 3
}
else Z80 mode {
(SPS – 1) ← IYd[15:8]
(SPS – 2) ← IYd[7:0]
SPS ← SPS – 2
}
where IYd indicates the sum of the contents of the register IY and the two’s-complement
displacement d .
Description
In ADL mode, the 24-bit sum of the contents of IY and the two’s-complement displace-
ment
d is pushed onto the stack at SPL. The stack pointer, SPL, decrements by 3. The
most significant byte (MSB) is pushed onto the stack first.
In Z80 mode, the 16-bit sum of the contents of IY and the two’s-complement displacement
d is pushed onto the stack at SPS. The stack pointer, SPS, decrements by 2. The most sig-
nificant byte (MSB) is pushed onto the stack first.
Condition Bits Affected
None.
Attributes
Mnemonic Operand ADL Mode Cycle Opcode (hex)
PEA IY+d 0/1 5/6 ED, 66, dd
PEA.S IY+d 1652, ED, 66, dd
PEA.L IY+d 0749, ED, 66, dd