LPC47M14X datasheet(168/205 Pages) SMSC

168 / 205 page

SMSC DS – LPC47M14X

Page 168

Rev. 03/19/2001

Table 72 – KYBD, Logical Device 7 [Logical Device Number = 0x07]

NAME

REG INDEX

DEFINITION

STATE

KRST_GA20

Default = 0x00

on VCC POR,

VTR POR and

HARD RESET

Bits[6:5] reset on

VTR POR only

0xF0

R/W

KRESET and GateA20 Select

Bit[7] Polarity Select for P12

= 0 P12 active low (default)

= 1 P12 active high

Bit[6] M_ISO. Enables/disables isolation of mouse

signals into 8042. Does not affect MDAT signal to

mouse wakeup (PME) logic.

1=block mouse clock and data signals into 8042

0= do not block mouse clock and data signals into

8042

Bit[5] K_ISO. Enables/disables isolation of keyboard

signals into 8042. Does not affect KDAT signal to

keyboard wakeup (PME) logic.

1=block keyboard clock and data signals into 8042

0= do not block keyboard clock and data signals into

8042

Bit[4] MLATCH

= 0

MINT is the 8042 MINT ANDed with Latched

MINT (default)

= 1 MINT is the latched 8042 MINT

Bit[3] KLATCH

= 0

KINT is the 8042 KINT ANDed with Latched

KINT (default)

= 1 KINT is the latched 8042 KINT

Bit[2] Port 92 Select

= 0 Port 92 Disabled

= 1 Port 92 Enabled

Bit[1] Reserved

Bit[0] Reserved

0xF1 -

0xFF

Reserved - read as ‘0’

Table 73 – PME, Logical Device A [Logical Device Number = 0x0A]

NAME

REG INDEX

DEFINITION

NOTES

CLKI32

Default = 0x00

on VTR POR

0xF0

R/W

Bit[7:2] Reserved

Bit [1]

SPEKEY_EN. This bit is used to turn the logic

for the “wake on specific key” feature on and

off. It will disable the 32kHz clock input to the

logic when turned off. The logic will draw no

power when disabled.

0 = “Wake on specific key” logic is on

(default)

1 = “Wake on specific key” logic is off

Bit [0]

SMSC Reserved (default = 0)

Note:

Bit [0] should always be zero.

If this is

changed, the Fan Tachometer, the Wake on Specific

Key, and the LED blink will not function if the 14MHz

clock is removed.

Eng.

Note 2

Eng.

Note 3

Note 1

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