PC8374L datasheet(83/239 Pages) NSC

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

Revision 1.1

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Figure 12. GPIO Events

Modem Ring Events

High-to-low transitions on RI1 or RI2 indicate the detection of a ring signal by an external modem connected to the Serial

Port 1 or Serial Port 2, respectively. The transitions on RI1 and RI2 are detected by the RI Wake-Up Detector powered by

VSB3, which works independently of the Serial Port 1 or Serial Port 2 modules (powered by VDD3).

A detected RI1 or RI2 transition sets the RI1_EVT_STS or RI2_EVT_STS status bit in GPE1_STS_2 register (see

Section 4.4.6 on page 102). The status bit is cleared only when the software writes 1 to it.

The transition detection from RI1 and RI2 is enabled (for event generation) tEWIV after VSB3 power is on (see “Wake-Up

Inputs at VSB3 Power Switching” on page 236). This prevents the detection of false events during VSB3 power-On transi-

tions.

Mouse Wake-Up Event

A mouse wake-up event is detected by the Keyboard/Mouse Wake-Up Detector, which monitors the MCLK and MDAT sig-

nals. Since the detection mechanisms for keyboard and mouse events are independent, they can be operated simultaneous-

ly. Moreover, the Keyboard signals may be swapped with the Mouse signals by setting SWAP bit in KBC Configuration

dently of the Keyboard Controller module (powered by VDD3).

The mouse event detection mechanism can be programed to detect either a mouse click or movement, a specific mouse

click (left or right) or a double-click. To program which mouse action causes an event detection, set MSEVCFG field in

PS2CTL register to the required value (see Section 4.3.8 on page 97).

A detected mouse event sets the MS_EVT_STS status bit in GPE1_STS_2 register (see Section 4.4.6 on page 102). The

status bit is cleared only when the software writes 1 to it.

Mouse event detection from MCLK and MDAT is enabled (for event generation) tEWIV after VSB3 power is on (see “Wake-

Up Inputs at VSB3 Power Switching” on page 236). This prevents the detection of false Mouse events during VSB3 power-

On transitions.

Event

Enable

Event Polarity

Input

Debouncer

GPIO Event Status

Internal

Bus

Write 1 to Clear

Status

GPIO Pin Conﬁguration Register 1

Event

Debounce

Enable

Bit 6

Bit 5

(GPCFG1)

Reset

Set

GPIO Ports Module

Read

GPIO

IRQ

Routing

Control

Status

GPIO

GPIO Ports Module

SWC

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PC8374L Datasheet(PDF) 83 Page - National Semiconductor (TI)

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