Zilog Z08470 Bedienungsanleitung Seite 131

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UM008007-0715 Z80 Instruction Description
Z80 CPU
User Manual
119
POP IX
Operation
IXH (SP+1), IXL (SP)
Op Code
POP
Operand
IX
Description
The top two bytes of the external memory last-in, first-out (LIFO) stack are popped to
Index Register IX. The Stack Pointer (SP) Register pair holds the 16-bit address of the
current top of the Stack. This instruction first loads to the low-order portion of IX 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
portion of IX. 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 IX results in Index Register IX 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 0 01010
E1
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