LPC47M112 SMSC Corporation, LPC47M112 Datasheet - Page 108

• Manufacturer Part Number: LPC47M112
• Description: ENHANCED SUPER I/O CONTROLLER WITH LPC INTERFACE
• Manufacturer: SMSC Corporation

Enhanced Super I/O Controller with LPC Interface
Datasheet
21 8042 KEYBOARD CONTROLLER DESCRIPTION
The LPC47M112 is a Super I/O and Universal Keyboard Controller that is designed for intelligent keyboard management
in desktop computer applications.
The Universal Keyboard Controller uses an 8042 microcontroller CPU core.
LPC47M112 enhancements to the 8042. For general information about the 8042, refer to the "Hardware Description of
the 8042" in the 8-Bit Embedded Controller Handbook.
KIRQ is the Keyboard IRQ
MIRQ is the Mouse IRQ
Port 21 is used to create a GATEA20 signal from the LPC47M112.
SMSC DS – LPC47M112
8042A
TST0
TST1
P27
P10
P26
P23
P22
P11
Keyboard and Mouse Interface
LS05
Page 108
This section concentrates on the
KDAT
KCLK
MCLK
MDAT
Rev. 02/02/2005