w83c42 Winbond Electronics Corp America, w83c42 Datasheet - Page 12

• Manufacturer Part Number: w83c42
• Description: Keyboard Controller
• Manufacturer: Winbond Electronics Corp America

APPLICATION CIRCUIT
Asynchronous
D0 - D7
RESETB
IOWB
IORB
SA2
39
10
12
13
14
15
16
17
18
19
2
3
4
1
9
6
5
8
7
X1
X2
RESET
T0
T1
A2
CS
V
RD
WR
D0
D1
D2
D3
D4
D5
D6
D7
V
DD
SS
P26/KCLK
P27/KDAT
P24/OB
P25/BF
V
P10
P11
P12
P13
P14
P15
P16
P17
P20
P21
P22
P23
DD
NC
25
27
28
29
30
31
32
33
34
21
22
23
24
35
36
37
38
11
KEYBOARD DATA
- 12 -
KEYBOARD CLOCK
RCB
GATE A20
1
U?A
74ALS04
2
1
3
RAM SELECT JUMPER
MANUFACTURING MODE JUMPER
U?A
7407
U?B
7407
KEYBOARD INHIBIT SWITCH
KEYBOARD INTERRUPT
DISPLAY TYPE SWITCH
2
4
V
D
D
VCC
KEYBOARD CLOCK
KEYBOARD DATA
W83C42