IYh <-> (SP+1), IYl <-> (SP)
EX
(SP),IY
| b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | $FD |
| 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | $E3 |
The low-order byte contained in Index Register IY is exchanged with the contents of the memory address specified by the contents of register pair SP (Stack Pointer), and the high-order byte of IY is exchanged with the next highest memory address (SP+1).
None
If Index Register IY contains $3988, the SP register pair Contains $0100, memory location $0100 contains byte $90, and memory location $0101 contains byte $48, then the instruction
EX (SP),IY
results in the IY register pair containing number $4890, memory location $0100 containing $88, memory location $0101 containing $39, and the Stack Pointer containing $0100.