PC87372 datasheet(72/144 Pages) NSC

72 / 144 page

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

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Revision 1.2

Modem Ring Event

High-to-low transitions on RI indicate the detection of a ring signal by an external modem connected to the Serial Port. The

transitions on RI are detected by the RI Wake-Up Detector powered by VSB3, which works independently of the Serial Port

module (powered by VDD3).

A detected RI transition sets the RI_EVT_STS status bit in GPE1_STS_2 register (see Section 6.4.6 on page 88). The status

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

The transition detection from RI is enabled (for event generation) tEWIV after VSB3 power is on (see Wake-Up Inputs at VSB3

Power Switching on page 143). This prevents the detection of false events during VSB3 power-On transitions.

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 6.3.7 on page 83).

A detected mouse event sets the MS_EVT_STS status bit in GPE1_STS_2 register (see Section 6.4.6 on page 88). 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 143). This prevents the detection of false Mouse events during VSB3 power-On

transitions.

Keyboard Wake-Up Events

Keyboard wake-up events are also detected by the Keyboard/Mouse Wake-Up Detector, which monitors the KBCLK and

KBDAT signals. Since the detection mechanisms for keyboard and mouse events are independent, they can be operated

simultaneously. Moreover, the Keyboard signals may be swapped with the Mouse signals, by setting SWAP bit in KBC Con-

figuration register (see Section 3.12.3 on page 54). The Keyboard/Mouse Wake-Up Detector is powered by VSB3 and works

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

The keyboard event detection mechanism can be programed to detect:

Any keystroke (Fast Any-Key or Special Key Sequence modes).

A speciﬁc programmable sequence of up to eight alphanumeric keystrokes (Password mode).

Any programmable sequence of up to eight bytes of data received from the keyboard (Special Key Sequence mode).

Up to three programmable Power Management keys concurrently available, each including a sequence of up to three

bytes of data received from the keyboard (Power Management Keys mode).

The Keyboard/Mouse Wake-Up Detector has four operation modes:

Fast Any-Key mode

Password mode

Special Key Sequence mode

Power Management Keys mode

Up to eight Keyboard Data registers (PS2KEY0-7) are used to define which keyboard data string generates an event. Since

the same set of registers is used by three of the four operation modes, only one mode can be selected at a time.

For modes involving more than one keystroke, the maximum delay allowed between pressing two consecutive keys is 4 sec-

onds. A longer delay is interpreted by the Wake-Up Detector as the beginning of a new sequence of keystrokes, which caus-

es the present sequence to be discarded. In all operation modes, pressing a wrong key requires a recovery time of 4

seconds, before a new (correct) sequence may be recognized.

Fast Any-Key Mode. In this mode, pressing any key on the keyboard is identified as a keyboard event and, as a result,

KBD_ANYK_STS bit in GPE1_STS_2 register is set (see Section 6.4.6 on page 88). The status bit is cleared only when the

software writes 1 to it. The key data contained in the PS2KEY0-7 registers is ignored. To program the Keyboard/Mouse

Wake-Up Detector to operate in Fast Any-Key mode, set KBDMODE field in KBDWKCTL register to ‘01’ (see Section 6.3.6

on page 82).

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