PC87413 datasheet(170/257 Pages) NSC

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9.0 System Wake-Up Control (SWC) (Continued)

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the related event generates a wake-up (i.e., it turns the VDD power supply On by setting ONCTL = 0). The ONCTL_EN_S3I

and ONCTL_EN_S45 bits enable or disable wake-up by the event when the PC8741x device is in S3I or in S45 current state,

respectively. Only two events lack a Wake-Up State Enable register (WK_ST_EN). These are:

— The watchdog event (flagged by the WDO_EVT_STS bit): this event does not affect ONCTL generation.

— The Power button event (ﬂagged by either the PWBT_EVT_STS bit or the PWRBTN_STS bit): this event uncondi-

tionally generates a wake-up (sets ONCTL = 0) when the PC8741x device is in S3I or S45 current states.

In addition, in Legacy Power Button mode (LEGACY_PWBT = 1 in the PWONCTL register), all wake-up events are ignored

(regardless of the bit value in their WK_ST_EN register) after the power supply has been turned off (by setting ONCTL = 1)

in response to a Power button event. In this case, the next Power button event unconditionally generates a wake-up (sets

ONCTL = 0).

Optionally, the system ACPI controller can be located in an external device. To select this option, both the EXT_ST_SELECT

bit in the SLP_ST_CFG register (see Section 9.3.31 on page 200) and the EXTSTMUX bit in the SIOCF3 register (see Sec-

tion 3.7.4 on page 51) must be set to ‘1’. In this case, ONCTL is turned On when the SLPS3 signal goes high (the system

is in S0 - S2 states). In this mode, ONCTL is independent of any wake-up event, including the Power button event (flagged

by either the PWBT_EVT_STS bit or the PWRBTN_STS bit).

Any valid wake-up event is disabled from reactivating the VDD power supply (by setting ONCTL = 0) for 1 second after the

power supply has been turned off (by setting ONCTL = 1). This feature protects the power supply from repeated on/off

switching if an event (such as Power button) is active for an extended period of time. If the Keyboard/Mouse Power Control

feature (VDDFELL; see Section 9.2.10 on page 175) is enabled by setting the VDDFLMUX bit to ‘1’ (in the SIOCF2 register;

see Section 3.7.3 on page 50), the Keyboard and Mouse wake-up events are disabled from reactivating the VDD for 2 sec-

onds after the power supply has been turned off (by setting ONCTL = 1).

Figure 50. ONCTL Control

Power Button Output (PWBTOUT)

The PWBTOUT function of the PC8741x device enables the (optional) external ACPI controller to synchronize its operation

to the wake-up events detected by the PC8741x device and to control the VDD power supply.

The Power button input (PWBTIN) is bridged to PWBTOUT regardless of any PC8741x device configuration bits, internal

state or wake-up event. This bridging is also independent of the status of the VDD power supply.

GPE1_STS_0-3

Status

Set

Detected

S3I_

VDD_ON

ONCTL

State S3I

From Other

Enabled Events

State S45

ONCTL_

EN_S45

State S45

ONCTL_

EN_S3I

State S3I

Set

Reset

Off

Power Button Override

Crowbar

1 Second

Pulse

Event

(one of 31

EXT_ST_

SELECT

SLPS3

Resume

from

Power Fail

SLPS5

events)

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