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THE
80286
INSTRUCTION SET
PUSHA-Push
All
General
Registers
Opcode Instruction
60
PUSHA
FLAGS MODIFIED
None
FLAGS UNDEFINED
None
OPERATION
Clocks
17
Description
Push
in
order: AX,CX,DX,8X,original
SP,8P,SI,DI
PUSHA
saves the registers noted above on the 80286 stack. The stack pointer
SP
is-decremented by
16
to hold the 8 word values. Since the registers are pushed onto the stack in the order in which they
were given, they will appear in the
16
new
stack bytes in the reverse order. The last register pushed
is
DI.
PROTECTED MODE EXCEPTIONS
#SS(O) if the starting or ending address
is
outside the stack segment limit.
REAL ADDRESS MODE EXCEPTIONS
The 80286 will shut down if SP =
1,
3,
or 5 before executing PUSHA.
If
SP
=
7,
9,
11,
13,
or 15,
exception
13
will occur.
8-88