31:0

ffffffffh

RW/V

Wake Alarm Device Expired Timer Value for AC Mode (WADT_​EXP_​AC_​VAL)

This field contains the 32-bit wake alarm device Expired Timer value (granularity 1s) for AC power.
The timer begins decrementing after switching from DC to AC power, in the case where the WADT_​AC timer has already expired while the platform was on DC power. This timer only decrements while operating on AC power. So if the power source switches back to DC power, the timer will stop (but not reset). When AC power returns, the timer will again begin decrementing.
Note: This timer will only begin decrementing under the conditions described above if this field has been configured for something other than its default value of FFFFFFFFh (i.e. FFFFFFFFh = disabled).
Upon expiration of this timer:
If on AC power, GPE0b_​STS.WADT_​STS will be set. This status bit being set will generate a host wake if GPE0b_​EN.WADT_​EN is 1.
BOTH the AC and DC Expired Timers return to their defaults value of FFFFFFFFh.