Zilog Z08470 Bedienungsanleitung Seite 127

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UM008007-0715 Z80 Instruction Description
Z80 CPU
User Manual
115
PUSH IX
Operation
(SP – 2) IXL, (SP – 1) IXH
Op Code
PUSH
Operand
IX
Description
The contents of Index Register IX are pushed to the external memory last-in, first-out
(LIFO) stack. The Stack Pointer (SP) Register pair holds the 16-bit address of the current
top of the Stack. This instruction first decrements SP and loads the high-order byte of IX
to the memory address specified by SP; then decrements SP again and loads the low-order
byte to the memory location corresponding to this new address in SP.
Condition Bits Affected
None.
Example
If Index Register IX contains 2233h and the Stack Pointer contains 1007h, then upon the
execution of a PUSH IX instruction, memory address
1006h contains 22h, memory
address
1005h contains 33h, and the Stack Pointer contains 1005h.
M Cycles T States 4 MHz E.T.
4 15 (4, 5, 3, 3) 3.75
11 1 01101
DD
11 0 01110
E5
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