w83c42 Winbond Electronics Corp America, w83c42 Datasheet - Page 4

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

Pin Description, continued
BLOCK DIAGRAM
(
PIN NO.
D0- D7
40-pin DIP)
35
36
37
38
39
40
RESET
XOUT
WR
RD
CS
XIN
A2
T0
T1
DATA
BUFFER
REGISTER
(
44-pin PLCC)
PIN NO.
39
40
41
42
43
44
HARDWIRE
SELECT
RECEIVE
CONTROL
CONTROL &
LOGIC
I/O
R60
O
O
O
O
I
-
W60
W64
R64
INPUT
BUFFER
REGISTER
BUFFER
REGISTER
OUTPUT
STATUS
BUFFER
REGISTER
NAME
P24
P25
P26
P27
V
T1
DD
SCAN
CODE
ROM
- 4 -
Bit 4 of Port 2 (OBF O/P Interrupt)
Bit 5 of Port 2 (I/P Buffer Empty)
Bit 6 of Port 2 (K/B Clock O/P)
Bit 7 of Port 2 (K/B Data O/P)
K/B Data Input
+5V Power Supply
STATUS
TRANSMIT
CONTROL
TRANSMIT
REGISTER
REGISTER
INPUT &
OUTPUT
PORT
INTERFACE
INTERFACE
OUTPUT
PORT
FUNCTION
P10
P11
P12
P13
P14 (RAM Select)
P15 (Manufacture Mode)
P16 (Display)
P17 (KBNH)
P20 (RC)
P21 (Gate A20)
P22
P23
P24
P25
P26 (Keyboard Clock)
P27
(Keyboard Data)
W83C42