LPC47M182 datasheet(119/223 Pages) SMSC

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Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

SMSC LPC47M182

119

Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)

DATASHEET

Table 7.10 - I/O Address Map

ADDRESS

COMMAND

BLOCK

FUNCTION (NOTE 1)

0x60

Write

KDATA

Keyboard Data Write (C/D=0)

Read

KDATA

Keyboard Data Read

0x64

Write

KDCTL

Keyboard Command Write (C/D=1)

Read

KDCTL

Keyboard Status Read

Note 1:

These registers consist of three separate 8 bit registers. Status, Data/Command Write and Data Read.

7.25.2 Keyboard Data Write

This is an 8 bit write only register. When written, the C/D status bit of the status register is cleared to zero

and the IBF bit is set.

7.25.3 Keyboard Data Read

This is an 8 bit read only register. If enabled by “ENABLE FLAGS”, when read, the KIRQ output is cleared

and the OBF flag in the status register is cleared. If not enabled, the KIRQ and/or AUXOBF1 must be

cleared in software.

7.25.4 Keyboard Command Write

This is an 8 bit write only register. When written, the C/D status bit of the status register is set to one and

the IBF bit is set.

7.25.5 Keyboard Status Read

This is an 8 bit read only register. Refer to the description of the Status Register for more information.

7.25.6 CPU-to-Host Communication

The LPC47M182 CPU can write to the Output Data register via register DBB. A write to this register

automatically sets Bit 0 (OBF) in the Status register. See Table 7.11.

Table 7.11 - Host Interface Flags

8042 INSTRUCTION

FLAG

OUT DBB

Set OBF, and, if enabled, the KIRQ output signal goes high

7.25.7 Host-to-CPU Communication

The host system can send both commands and data to the Input Data register. The CPU differentiates

between commands and data by reading the value of Bit 3 of the Status register. When bit 3 is “1”, the

CPU interprets the register contents as a command. When bit 3 is “0”, the CPU interprets the register

contents as data. During a host write operation, bit 3 is set to “1” if SA2 = 1 or reset to “0” if SA2 = 0.

LPC47M182 Datasheet(PDF) 119 Page - SMSC Corporation

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