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POPF
POP
FLAGS
POPF
Operation:
Flags - ((SP) + 1 :(SP))
(SP)
- (SP) + 2
Description:
POPF
POPF
transfers specific bits from the word at
the current top
of
stack (pointed to by register
SP) into the 8086/8088 flags, replacing
whatever values the flags previously contained
(see
figure 2-32). SP
is
then incremented
by
two to point to the new top
of
stack.
PUSHF
Encoding:
1100111011
Flags Affected:
All
and
POPF
allow a procedure to save and
restore a calling program's flags. They also
allow a program to change the setting
of
TF
(there
is
no instruction for updating this flag
directly). The change
is
accomplished by
pushing the flags, altering bit 8
of
the memory-
image and then popping the flags.
POPF Operands Clocks Transfers Bytes POPF Coding Example
(no
operands)
12
1
1
POPF
2-128