Zilog Z08470 - Manual (Page 131)

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
1 1 1 0 1 1 0 1 DD
1 1 0 0 1 0 1 0 E1