REG OFFSET
(hex)
NAME
DESCRIPTION
General Purpose I/0 bit 1.6
GP16
29
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[2] Alternate Function Select
1= J2X (Joystick 2, X-Axis RC Constant)
0=GPIO
Default = 0x01
on VTR POR
(R/W)
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= J2Y (Joystick 2, Y-Axis RC Constant)
0=GPIO
Default = 0x01
on VTR POR
(R/W)
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[2] Alternate Function Select
1=8042 P17 function (Note 10)
0=Basic GPIO function
Default = 0x01
on VTR POR
(R/W)
Bits[6:3] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
GP21
2C
General Purpose I/0 bit 2.1
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[3:2] Alternate Function Select
11= nDS1 – Floppy Drive Select 1 (Note 4)
10=Either Edge Triggered Interrupt Input 0 (Note 1)
01=8042 P16 function (Note 10)
00=Basic GPIO function
Bits[6:4] Reserved
Default =0x01
on VTR POR
(R/W)
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
SMSC DS – LPC47M14X
Page 139
Rev. 03/19/2001
SMSC [ SMSC CORPORATION ]
