
1.0 Signal/Pin Connection and Description
(Continued)
www.national.com
28
Revision1.2
P
1.4.9
System Wake-Up Control (SWC)
Signal
Pin(s)
I/O Buffer Type
Power
Well
Description
GPIOE10-17,
GPIOE40-41,
GPIOE42,
GPIOE43-47,
1-8
2-21
35
49-53
I
IN
TS
V
SB
Wake-up Inputs.
Generate a wake-up event or an interrupt.
These pins have programmable debounce protection.
RI1
RI2
101
109
I
IN
TS
V
SB
Ring Indicator Wake-up.
When low, generates a wake-up
event or an interrupt, indicating that a telephone ring signal was
received by the modem.
KBCLK
125
I/O
IN
TS
/OD
14
V
SB
Keyboard Clock Wake-up.
Generates a wake-up event or an
interrupt, indicating a change in the keyboard clock signal.
KBDAT
126
I/O
IN
TS
/OD
14
V
SB
Keyboard Data Wake-up.
Generates a wake-up event or an
interrupt, indicating a change in the keyboard data signal.
MCLK
127
I/O
IN
TS
/OD
14
V
SB
Mouse Clock Wake-up.
Generates a wake-up event or an
interrupt, indicating a change in the mouse clock signal.
MDAT
128
I/O
IN
TS
/OD
14
V
SB
Mouse Data Wake-up.
Generates a wake-up event or an
interrupt, indicating a change in the mouse data signal.
PWBTIN
36
I
IN
TS
V
SB
Power Button In.
Active (low) level indicates a user request to
turn the power on or off. This pin has debounce protection.
PWBTOUT
49
O
OD
6
V
SB
Power Button Out.
Output for the chip-set Power button input.
SLBTIN
35
I
IN
TS
V
SB
Sleep Button In.
Active (low) level indicates a user request to
enter or exit Sleep mode. This pin has debounce protection.
SLPS3,
SLPS5
52, 53
I
IN
TS
V
SB
Sleep State 3 to 5.
Active (low) level indicates the system is in
one of the sleep states S3, S4 or S5. These signals are
generated by an external ACPI controller.
Pins
SLPS3 SLPS5Functionality
1
1
Working state (S0) or sleep states S1 or S2
0
1
Sleep state S3
0
0
Sleep states S4 or S5
1
0
Illegal combination
SIOSCI
38
O
OD
6
V
SB
System Control Interrupt.
Active (low) level indicates that a
wake-up event occurred, causing the system to exit its current
sleep state. External pull-up resistor to V
SB
is required.
SIOSMI
37
O
OD
6
V
SB
System Management Interrupt.
Active (low) level indicates
that an SMI occurred. External pull-up resistor to V
SB
is
required.
ONCTL
39
O
OD
6
V
SB
Power Supply On/Off Control.
Active level (low) indicates that
the power should be turned on. External pull-up resistor is
required
LED1, LED2
50, 51
O
O
12/12
V
SB
LED Drive.
These outputs can be connected directly to LED
devices. They can be configured as one dual-colored LED or
two single-colored LEDs with programmable blink rate for all
LEDs.
VDDFELL
54
O
O
3/6
V
SB
V
DD
Power Fell.
Active pulse (high) indicates that the V
DD
power supply has been turned off. Optionally, this pin can be
used to drive an external circuit that pulses the V
SB
power to
the Keyboard and Mouse, thus resetting them.
WDO
55
O
O
3/6
V
SB
Watchdog Out.
An active pulse (low) of a fixed width; it is
generated when a watchdog time-out occurs.