W83977A Winbond Electronics Corp America, W83977A Datasheet - Page 78

• Manufacturer Part Number: W83977A
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

W83977TF
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 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
pin, and connect
PANSWOUT
TM
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 enable by setting LD-0A CR-E0 bit 6. The pre-determined keys
data are stored in registers, and they can be access by an indirection method. At 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
waken up after any key 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
pin. Thus
is blocked to
, by setting LD-0A CR-E0 properly
PANSWIN
PANSWIN
PANSWOUT
and make only 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) to perform wake-up function.
Publication Release Date: March 1998
- 69 -
Revision 0.62