LPC47M14X datasheet(140/205 Pages) SMSC

140 / 205 page

SMSC DS – LPC47M14X

Page 140

Rev. 03/19/2001

NAME

REG OFFSET

(hex)

DESCRIPTION

GP22

Default =0x01

on VTR POR

(R/W)

General Purpose I/0 bit 2.2

Bit[0] In/Out : =1 Input, =0 Output

Bit[1] Polarity : =1 Invert, =0 No Invert

Bit[3:2] Alternate Function Select

11= nMTR1 – Floppy Motor Select 1 (Note 4)

10=Either Edge Triggered Interrupt Input 1 (Note 1)

01=8042 P12 function (Note 10)

00=Basic GPIO function

Bits[6:4] Reserved

Bit[7] Output Type Select

1=Open Drain

0=Push Pull

N/A

(R)

Reserved – reads return 0

GP24

Default = 0x01

on VTR POR

(R/W)

General Purpose I/0 bit 2.4

Bit[0] In/Out : =1 Input, =0 Output

Bit[1] Polarity : =1 Invert, =0 No Invert

Bit[2] Reserved

Bits[6:3] Reserved

Bit[7] Output Type Select

1=Open Drain

0=Push Pull

GP25

Default = 0x01

on VTR POR

(R/W)

General Purpose I/0 bit 2.5

Bit[0] In/Out : =1 Input, =0 Output

Bit[1] Polarity : =1 Invert, =0 No Invert

Bit[2] Alternate Function Select

1=MIDI_IN

0=GPIO

Bits[6:3] Reserved

Bit[7] Output Type Select

1=Open Drain

0=Push Pull

GP26

Default = 0x01

on VTR POR

(R/W)

General Purpose I/0 bit 2.6

Bit[0] In/Out : =1 Input, =0 Output

Bit[1] Polarity : =1 Invert, =0 No Invert

Bit[2] Alternate Function Select

1=MIDI_OUT

0=GPIO

Bits[6:3] Reserved

Bit[7] Output Type Select

1=Open Drain

0=Push Pull

GP27

Default = 0x01

on VTR POR

(R/W)

General Purpose I/0 bit 2.7

Bit[0] In/Out : =1 Input, =0 Output

Bit[1] Polarity : =1 Invert, =0 No Invert

Bit[2] Alternate Function Select

1=nIO_SMI (Note 5)

0=GPIO

Bits[6:3] Reserved

Bit[7] Output Type Select

1=Open Drain

0=Push Pull

LPC47M14X Datasheet(PDF) 140 Page - SMSC Corporation

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