Z86E3016PSG Datasheet, PDF (307/348 Pages) Zilog, Inc. – Z86E3016PSG

Z8 CPU
User Manual
289
Push
PUSH src
Instruction Format
OPC
src
Cycles
10 Internal Stack
12 External Stack
10 Internal Stack
10 External Stack
OPC
(Hex)
70
71
Address Mode
dst
R
IR
Operation
SP ← SP–1
@SP ← src
The contents of the SP (stack pointer) are decremented by one, then the
contents of the source operand are loaded into the location addressed by
the decremented SP, thus adding a new element to the stack.
Flag
C
Z
S
V
D
H
Description
Unaffected
Unaffected
Unaffected
Unaffected
Unaffected
Unaffected
Note: Address modes R or IR can be used to specify a 4-bit Working Register. In
this format, the destination Working Register operand is specified by add-
ing 1110b (Eh) to the high nibble of the operand. For example, if Working
Register R12 (CH) is the destination operand, then ECh will be used as the
destination operand in the Op Code.
E
dst
UM001602-0904
Instruction Description