REG OFFSET
(hex)
NAME
DESCRIPTION
General Purpose I/0 bit 1.5
GP15
28
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[2] Alternate Function Select
1=XD5
Default = 0x04
on VTR POR
(R/W)
0=GPIO
Bits[6:3] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
GP16
29
General Purpose I/0 bit 1.6
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[2] Alternate Function Select
1=XD6
Default = 0x04
on VTR POR
(R/W)
0=GPIO
Bits[6:3] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
GP17
2A
General Purpose I/0 bit 1.7
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[2] Alternate Function Select
1=XD7
Default = 0x04
on VTR POR
(R/W)
0=GPIO
Bits[6:3] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
GP20
2B
General Purpose I/0 bit 2.0
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[3:2] Alternate Function Select
11=Reserved
Default = 0x01
on VTR POR
(R/W)
10=nDS1 – Floppy Drive select 1 (Note 3)
01=8042 P17 function (User Note 2)
00=Basic GPIO function
Bits[6:4] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
SMSC LPC47S45x
Page 173 of 259
Rev. 06-01-06
DATASHEET
SMSC [ SMSC CORPORATION ]
