Zilog Z08470 Bedienungsanleitung Seite 132

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Z80 Instruction Set UM008007-0715
120
Z80 CPU
User Manual
POP IY
Operation
IYH (SP – X1), IYL (SP)
Op Code
POP
Operand
IY
Description
The top two bytes of the external memory last-in, first-out (LIFO) stack are popped to
Index Register IY. The Stack Pointer (SP) Register pair holds the 16-bit address of the cur-
rent top of the Stack. This instruction first loads to the low-order portion of IY the byte at
the memory location corresponding to the contents of SP; then SP is incremented and the
contents of the corresponding adjacent memory location are loaded to the high-order por-
tion of IY. The SP is incremented again.
Condition Bits Affected
None.
Example
If the Stack Pointer Contains 1000h, memory location 1000h contains 55h, and location
1001h contains 33h, the instruction POP IY results in Index Register IY containing
3355h, and the Stack Pointer containing 1002h.
M Cycles T States 4 MHz E.T.
4 14 (4, 4, 3, 3) 3.50
11 1 01101
DD
11 1 01111
FD
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