ZiLOG Z8 Technical Manual

PUSH
Push
PUSH src
Instruction For.at:
OPC
Address Mode
Cycles
(Hex)
IIrc
~ ______ o_P_c ______ ~1 I~ _______ s_rc ______ ~
10
Internal stack
70
R
12 External stack
Operation:
Flags:
EX8lllple:
Note:
SP <-- SP - 1
asp <-- src
12
14
Internsl
Externsl
stack
71
IR
stack
The contents of the SP are decremented, then the contents of the source are loaded
into the location addressed by the decremented SP, thus adding a new element to the
top of the stack.
No flags affected
If the SP contains ~1n01, the statement
PUSH FLAGS
stores the contents of the register named FLAGS in location ~1000. After the PUSH
operation, the SP contains %1000.
When used to specify a 4-bit working-register address, address modes R or IR use the
format:
E
src
5-35

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English