W81281 View Datasheet(PDF) - Winbond
Part Name
Description
Manufacturer
W81281 Datasheet PDF : 37 Pages
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5.3 48-PIN LQFP
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
NAME
VDD3
SI0/P10
SI1/P11
SI2/P12
SI3/P13
NC
SO04/P04
SO05/P05
SO06/P06
SO07/P07
IDSEL/P30
NC
LED0/P33
PSCLK/P32
PSDA/P31
LED1/P34
LED2/P35
RESET
X2
X1
VDD
SO08/P20
SO09/P21
NC
SO10/P22
SO11/P23
SO12/P24
SO13/P25
SO14/P26
SO15/P27
W81281
Preliminary
TYPE
POWER
I/O
I/O
I/O
I/O
none
I/O
I/O
I/O
I/O
I/O
none
I/O
I/O
I/O
I/O
I/O
INPUT
OUTPUT
INPUT
POWER
I/O
I/O
none
I/O
I/O
I/O
I/O
I/O
I/O
DESCRIPTION
DC power 3.3V output
Keyboard scan Input 0 / Internal µC IO port 1.0
Keyboard scan Input 1 / Internal µC IO port 1.1
Keyboard scan Input 2 / Internal µC IO port 1.2
Keyboard scan Input 3 / Internal µC IO port 1.3
Not Used
Keyboard scan Output 04 / Internal µC IO port 0.4
Keyboard scan Output 05 / Internal µC IO port 0.5
Keyboard scan Output 06 / Internal µC IO port 0.6
Keyboard scan Output 07 / Internal µC IO port 0.7
Vendor ID selection / Internal µC IO port 3.0
Not Used
Num. Lock LED / Internal µC IO port 3.3
PS/2 mouse clock pin / Internal µC IO port 3.2
PS/2 mouse data pin / Internal µC IO port 3.1
Caps Lock LED / Internal µC IO port 3.4
Scroll Lock LED / Internal µC IO port 3.5
Chip reset pin
Clock output
Clock input
VDD power
Keyboard scan Output 08 / Internal µC IO port 2.0
Keyboard scan Output 09 / Internal µC IO port 2.1
Not Used
Keyboard scan Output 10 / Internal µC IO port 2.2
Keyboard scan Output 11 / Internal µC IO port 2.3
Keyboard scan Output 12 / Internal µC IO port 2.4
Keyboard scan Output 13 / Internal µC IO port 2.5
Keyboard scan Output 14 / Internal µC IO port 2.6
Keyboard scan Output 15 / Internal µC IO port 2.7
9
Publication Release Date: July 1999
Revision 0.60
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