w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 92

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

W83977EF/ CTF
PRELIMINARY
6.6
OnNow / Security Keyboard and Mouse Wake-Up
---- Programmable Keyboard / Mouse Wake-Up Functions
Winbond's unique programmable keyboard/ mouse Wake-Up functions provide the system with
diversified methods for either OnNow Wake-Up application, or security control application. The
keyboard or mouse can Wake-Up the system by producing a panel switch low pulse on PANSWOT#
TM
pin, and connect it to chipset (for example Intel
chipset TX, LX PIIX4) panel switch input. The
Wake-Up conditions can be programmed as pre-determined or any keys/buttons. To implement this
function, a 32.768KHz crystal must be installed between XTAL1 and XTAL2, or a 32.768KHz clock to
be connected to XTAL1 and leave XTAL2 open. The V
pin must be connected to +5V V
of ATX
SB
SB
power supply, and an external battery should be installed on V
pin to store the data (the
BAT
passwords and Wake-Up status which had been set already) when power fails.
6.6.1 Keyboard Wake-Up Function
The keyboard Wake-Up function is enabled by setting LD-0A CR-E0 bit 6. The pre-determined keys
data are stored in registers, and they can be accessed by an indirect method. First, write their index
address to LD-0A CR-E1, then access them by reading/writing LD-0A CR-E2. A zero data is written
to the register means the comparison of this register will be ignored. The pre-programmed keys may
be 1 to 5 keys with various combinations. If LD-0A CR-E0 bit 0 is set, the system will be woken up
after any key is struck.
6.6.2 Keyboard Password Wake-Up Function
To implement this function, the bit 7 of LD-0A CR-E0 must be set, and panel switch input is
connected to PANSWIN# pin. Thus PANSWIN# is blocked to PANSWOUT#, by setting LD-0A CR-
E0 properly so that only the keyboard can Wake-Up the system with preset keys (password).
6.6.3 Mouse Wake-Up Function
The mouse Wake-Up function is activated by setting bit 5 of LD-0A CR-E0. If bit 1 of LD-0A CR-E0 is
set, any movement or button clicking will make up the system. Otherwise, the mouse can Wake-Up
the system only by clicking its button twice successively with the mouse unmoved. The bit 4 of LD-
0A CR-E0 determines which button (left or right) is to perform Wake-Up function.
Publication Release Date: March 1999
-83 -
Revision A1