W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 152

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.2 Wake Up the System by Keyboard and Mouse
The W83627UHG generates a low pulse through the PSOUT# pin to wake up the system when it
detects a key code pressed or mouse button clicked. The following sections describe how the
W83627UHG works.
13.2.1
The keyboard Wake-Up function is enabled by setting Logical Device A, CR[E0h], bit 6 to “1”.
There are two keyboard events that can be used for the wake-up
1) Any key – Set bit 0 at Logical Device A, CR[E0h] to “1” (Default).
2) Specific keys (Password) - Set bit 0 at Logical Device A, CR[E0h] to “0”.
Three sets of specific key combinations are stored at Logical Device A. CR[E1h] is an index register to
indicate which byte of key code storage (0x00h ~ 0x0Eh, 0x30h ~ 0x3Eh, 0x40h ~ 0x4Eh) is going to
be read or written through CR[E2h]. According to IBM 101/102 keyboard specification, a complete key
code contains a 1-byte make code and a 2-byte break code. For example, the make code of “0” is
0x45h, and the corresponding break code is 0xF0h, 0x45h.
The approach to implement Keyboard Password Wake-Up Function is to fill key codes into the
password storage. Assume that we want to set “012” as the password. The storage should be filled as
below. Please note that index 0x09h ~ 0x0Eh must be filled as 0x00h since the password has only
three numbers.
Index(CRE1)
D a t a (CRE2)
To ensure that VCC does not fall faster than VSB in various ATX Power Supplies, the W83627UHG
adds the option of “user define mode” for the pre-defined state before AC power failure. BIOS can set
the pre-defined state to be “On” or “Off”. According to this setting, the system is returned to the pre-
defined state after the AC power recovery.
Waken up by Keyboard events
1E
00
01
F0
1E
02
03
16
F0
04
05
16
-141-
06
45
F0
07
08
45
Publication Release Date: May 25, 2007
09
00
0A 0B 0C 0D 0E
First-pressed key “0”
Second-pressed key “1”
Third-pressed key “2”
00
00
W83627UHG
00
00
Revision 1.0
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