LPC47B272-MS SMSC, LPC47B272-MS Datasheet - Page 99

• Manufacturer Part Number: LPC47B272-MS
• Description: IC CTRLR SUPER I/O LPC 100-QFP
• Manufacturer: SMSC

Specifications of LPC47B272-MS

• Controller Type: I/O Controller
• Interface: LPC
• Voltage - Supply: 3.3V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1019

The LPC47B27x 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. This section concentrates on
the LPC47B27x enhancements to the 8042. For general information about the 8042, refer to the "Hard-
ware 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 LPC47B27x.
KEYBOARD INTERFACE
The LPC47B27x LPC interface is functionally compatible with the 8042 style host interface. It consists of
the D0-7 data signals; the read and write signals and the Status register, Input Data register, and Output
Data register. Table 51 shows how the interface decodes the control signals. In addition to the above
signals, the host interface includes keyboard and mouse IRQs.
Note 1: These registers consist of three separate 8 bit registers. Status, Data/Command Write and Data
SMSC LPC47B27x
Read.
ADDRESS
0x60
0x64
8042A
8042 KEYBOARD CONTROLLER DESCRIPTION
TST0
TST1
Comman
P27
P10
P26
P23
P22
P11
Write
Read
Write
Read
d
Keyboard and Mouse Interface
Table 51 - I/O Address Map
DATASHEET
BLOCK
KDATA
KDATA
KDCTL
KDCTL
LS05
- 99 -
Keyboard Data Write (C/D=0)
Keyboard Data Read
Keyboard Command Write (C/D=1)
Keyboard Status Read
FUNCTION (NOTE 1)
KDAT
KCLK
MCLK
MDAT
Rev. 04-17-07