W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 115

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

10. KEYBOARD CONTROLLER
The KBC (8042 with licensed KB BIOS) circuit of W83977F/G, W83977AF/AG is designed to provide
the functions needed to interface a CPU with a keyboard and/or a PS/2 mouse, and can be used with
IBM ® - compatible personal computers or PS/2-based systems. The controller receives serial data
from the keyboard or PS/2 mouse, checks the parity of the data, and presents the data to the system
as a byte of data in its output buffer. Then, the controller will assert an interrupt to the system when
data are placed in its output buffer. The keyboard and PS/2 mouse are required to acknowledge all
data transmissions.
acknowledge is received for the previous data byte.
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
Multiplex I/O PINS
GP I/O PINS
No transmission should be sent to the keyboard or PS/2 mouse until an
KINH
Keyboard and Mouse Interface
P17
P12~P16
-107 -
8042
P25
P21
T0
P24
P20
P27
P10
P26
P23
T1
P22
P11
Publication Release Date: May 2006
MCLK
MDAT
KIRQ
MIRQ
KDAT
KCLK
GATEA20
KBRST
Revision 0.60