Zilog Z08470 - Manual (Page 127)

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
1 1 1 0 1 1 0 1 DD
1 1 0 0 1 1 1 0 E5