F81867 Datasheet, PDF (97/315 Pages) Feature Integration Technology Inc. – 6 UARTs μSuper IO With 128 Bytes FIFO and Power Saving Functions

H: High; L: Low
Power saving mode would be activated via CR0A index E0 bit 7.
F81867
6.8.1.3 AC Loss & Resume Control Methods
There are 4 modes under power loss state via setting ACPI control register. The always on, always off,
keep last state & bypass mode. In keep last state mode, one register will latch the status before power
loss. If it is power on before power loss, it will automatically power on when power is resumed. If it is
power off before power loss, it will remain power off when power is resumed. See below for the detail:
Mode
Always on
(S0)
Explanation
When AC resume, the system will power on automatically (send a PWSOUT# low pulse and
then sinking the PS_ON# low). See below for the timing:
S5 S0
S5
S0
S5
VBAT
VSB
RSMRST#
S3#
PS_ON#
PSIN#
PSOUT#
VCC3V
When AC resume, the system is in off state and waiting for the wakeup events. See below for
the timing:
Always off
(S5)
G3 S0
S5
S0
S5
VBAT
VSB
RSMRST#
S3#
PS_ON#
PSIN#
PSOUT#
VCC3V
User press the button
Bypass When AC resume, inverting the S3 signal to PS_ON#. See below for the timing:
(follow the
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Dec, 2011
V0.12P