PUSH - Z80 instruction reference

pushPush onto stack 
Stores BC, DE, HL, AF, IX or IY on the stack, decrementing SP once for each byte.
Used in The stack, push and popZ80 assembly
call, ret and passing valuesZ80 assembly
Interrupts: im, ei, di and haltZ80 assembly
Stack arguments and a stack frameZ80 assembly
Recursion: factorial and FibonacciZ80 assembly
Binary searchZ80 assembly
A 2D arrayZ80 assembly
Read two numbers and print their sumZ80 assembly
Flappy birdZ80 assembly
 
SZHP/VNC ––––––
Changes no flag
Forms  push    1 byte · 11 cycles 
SP is decremented and the high byte of rr is stored into the memory location pointed to by SP. SP is decremented again and the low byte of rr is stored into the memory location pointed to by SP.
 push    2 bytes · 15 cycles 
SP is decremented and IXH is stored into the memory location pointed to by SP. SP is decremented again and IXL is stored into the memory location pointed to by SP.
Operands rr A register pair: bc, de, hl or af. 
ix The ix index register. You can also use iy, with the same instruction size and timing. More
         .org 0x8000
        ld bc, 0x0234
        push bc
        halt