DESCRIPTION OF PIN FUNCTIONS
BUFFER TYPE
PER
PIN
No./
QFP
BUFFER
FUNCTION
(NOTE 1)
TYPE
IS/OP14
IS/OP14
IS/OP14
IOP14
NAME
TOTAL
SYMBOL
NOTE
S
70
71
72
Port Data 2/FDC Write
Protected
Port Data 3/FDC Read
1
1
1
PD2
IOP14/IS
IOP14/IS
IOP14/IS
/nWRTPRT
PD3
Disk Data
/nRDATA
Port Data 4/FDC Disk
Change
PD4
/nDSKCHG
73
74
Port Data 5
1
1
PD5
IOP14
IOP14/OD14
Port Data 6/
FDC Motor On 0
Port Data 7
PD6/nMTR0 IOP14
75
77
1
1
PD7
IOP14
IO12
IOP14
I/OD12
Printer Selected
SLCT
Status/FDC Write Gate
/nWGATE
78
79
80
81
82
83
Paper End/FDC Write
1
1
1
1
1
1
PE
IO12
IO12
I/OD12
I/OD12
I/OD12
I/OD12
Data
/nWDATA
Busy/FDC Motor On
BUSY
/nMTR1
Acknowledge/FDC
Drive Select 1
nACK /nDS1 I/OD12
Error/FDC Head Select
nERROR
/nHDSEL
IO12
Autofeed Output/FDC
Density Select
nALF
OP14
OP14
(OD14/OP14)/
OD14
/nDRVDEN0
Strobe Output/FDC
nSTROBE
(OD14/OP14)/
Drive Select
/nDS0
OD14
KEYBOARD/MOUSE INTERFACE (6)
56
57
58
59
63
Keyboard Data
Keyboard Clock
Mouse Data
1
1
1
1
1
KDAT
KCLK
MDAT
MCLK
IOD16
IOD16
IOD16
IOD16
IO8
IOD16
IOD16
IOD16
IOD16
Mouse Clock
General Purpose I/O
/Keyboard Reset
General Purpose I/O
/Gate A20
GP36/
(I/O8/OD8)/
10
10
nKBDRST
GP37/A20M
O8
(I/O8/OD8)/
O8
64
1
IO8
GENERAL PURPOSE I/O (19)
32
33
34
35
36
37
38
39
General Purpose I/O
/Joystick 1 Button 1
1
1
1
1
1
1
1
1
GP10/J1B1
GP11/J1B2
GP12/J2B1
GP13/J2B2
GP14/J1X
GP15/J1Y
GP16/J2X
GP17/J2Y
IS/O8
IS/O8
IS/O8
IS/O8
IO12
IO12
IO12
IO12
(IS/O8/OD8)/
IS
General Purpose I/O
(IS/O8/OD8)/
/Joystick 1 Button 2
IS
General Purpose I/O
/Joystick 2 Button 1
(IS/O8/OD8)/
IS
General Purpose I/O
(IS/O8/OD8)/
/Joystick 2 Button 2
IS
General Purpose I/O
/Joystick 1 X-Axis
(I/O12/ OD12)/
IO12
General Purpose I/O
(I/O12/ OD12)/
/Joystick 1 Y-Axis
IO12
General Purpose I/O
/Joystick 2 X-Axis
(I/O12/
OD12)/IO12
General Purpose I/O
(I/O12/
/Joystick 2 Y-Axis
OD12)/IO12
SMSC LPC47B27x
- 11 -
Rev. 08-10-04
DATASHEET
SMSC [ SMSC CORPORATION ]
