PC87413 datasheet(162/257 Pages) NSC

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

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162

Revision1.2

Figure 47. SWC Block Diagram

9.2

FUNCTIONAL DESCRIPTION

9.2.1

External Events

General-Purpose Input/Output Events

The PC8741x devices support 16 VSB-powered General-Purpose Input/Output events through ports GPIOE10-17 and

GPIOE40-47. VDD- and VSB-powered signals can be connected to the GPIO pins to become sources of external events. A

VDD-powered signal used to generate an event is internally disabled (for event generation) while VDD power is off and also

for 1 second after VDD power is restored. This prevents the detection of false events during power transitions and while the

signal driver is unpowered. For the same reasons, a VSB-powered signal used to generate an event is enabled only 1 second

after the VSB power is on. (When VSB is off, the whole SWC module is disabled.)

Each GPIOE pin has programmable polarity and an optional 16 ms debouncer (see Figure 48). The debouncer is enabled

after the reset but can be disabled by software.

A GPIO event can generate the system interrupts (IRQ and SMI) if the event is enabled and routed to the specific interrupt.

The status, event enable and pending event routing bits to IRQ and SMI are implemented in the GPIO Ports module (see

Section 7.3 on page 137). The status bit is set when an event of the programmed type (edge or level) is detected.

A GPIO event can also generate the Power Management signals (the SCI interrupt, the ONCTL power supply control and

the PWBTOUT signal). The status, event enable and wake-up state enable bits are implemented in the SWC module (see

Figures 48 and 50).

External

Events

IRQ

SIOSMI

Interrupt

Routing

Control

SIOSCI

SCI

Interrupt

Enable

ONCTL

PWBTOUT

4 Sec.

Override

and

Power

Management

Signals

Crowbar

Enable

LED1

LED2

LED

Control

Power Active Timers

Debounce

and

Detection

Event

Status

Internal

Events

Power Button

VDD, VSB Status

Current Sleep State

1 Hz Clock

Sleep

State

Converter

SLP_TYPx

SLP_EN

SPLS3

SLPS5

SWC

Watchdog

1 Min. Clock

WDO

Legacy

Power

Button

Power Button

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