W83627EG Nuvoton Technology Corporation of America, W83627EG Datasheet - Page 187

• Manufacturer Part Number: W83627EG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EG

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

11. KEYBOARD CONTROLLER
The W83627EHF/EHG/EF/EG KBC (8042 with licensed KB BIOS) circuit 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
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 asserts 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. No transmission should be sent to the keyboard or PS/2 mouse until an
acknowledgement is received for the previous data byte.
11.1 Output Buffer
The output buffer is an 8-bit, read-only register at I/O address 60h (Default, PnP programmable I/O
address LD5-CR60 and LD5-CR61). The keyboard controller uses the output buffer to send the scan
code (from the keyboard) and required command bytes to the system. The output buffer can only be
read when the output buffer full bit in the register (in the status register) is logical 1.
11.2 Input Buffer
®
-
compatible personal computers or PS/2-based systems. The controller receives serial data from
Multiplex I/O PINS
GP I/O PINS
KINH
Keyboard and Mouse Interface
P17
P12~P16
W83627EHF/EF, W83627EHG/EG
8042
- 176 -
P25
P21
T0
P24
P20
P27
P10
P26
P23
T1
P22
P11
MCLK
MDAT
KIRQ
MIRQ
KDAT
KCLK
GATEA20
KBRST