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Teilenummer | W83C42 |
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Beschreibung | KEYBOARD CONTROLLER | |
Hersteller | Winbond | |
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Gesamt 15 Seiten www.DataSheet4U.com
W83C42
KEYBOARD CONTROLLER
GENERAL DESCRIPTION
The W83C42 keyboard controller is programmed to support the IBM® compatible personal computer
keyboard serial interface. The keyboard controller receives serial data from the keyboard, checks the
parity of the data, translates the scan code, and presents the data to the system as a byte of data in
its output buffer. The controller will interrupt the system when data is placed in its output buffer. The
byte of data will be sent to the keyboard serially with an odd parity bit automatically inserted. The
keyboard is required to acknowledge all data transmissions. No transmission should be sent to the
keyboard until acknowledge is received for the previous byte sent.
Winbond Electronics Corporation has developed a fast keyboard controller and BIOS to improve the
performance of IBM PC/AT® 386™DX/SX and 486™DX/SX machines and their compatibles. Hardwire
methodology is used in this keyboard controller instead of software implementation, as in the
traditional 8042 keyboard BIOS. This enables the keyboard controller to respond instantly to all
commands sent from the keyboard to the CPU BIOS.
The keyboard controller enables popular programs such as AutoCAD®, Microsoft® Windows™ 3.1,
NOVELL®, and other programs to run much faster.
FEATURES
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• Supports IBM PC/AT 386DX/SX and 486 DX/SX system designs
• Runs much faster than traditional keyboard controllers
• Host interface compatible with traditional keyboard controller
• 6MHz~12MHz operating frequency
• Communicates with keyboard directly
• High-reliability CMOS technology
• Available packages: 40-pin DIP, 44-pin PLCC
DataShee
IBM and PC/AT are registered trademarks of International Business Machines Corporation. 386 and 486 are trademarks of Intel
Corporation. AutoCAD is a registered trademark of Autodesk, Inc. Microsoft is a registered trademark and Windows is a trademark of
Microsoft Corporation. NOVELL is a registered trademark of Novell, Inc.
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Publication Release Date: July 1994
- 1 - Revision A3
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TIMING WAVEFORMS
Write Cycle Timing
et4U.com
A2, CS
WR
D0 - D7
A20
OUTPUT PORT
FAST RESET PULS RC
FE COMMAND
T1
T3
ACTIVE
T5
T7 T8
DATA IN
T9
T17
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W83C42
T18 DataShee
Read Cycle Timing
A2, CS
AEN
RD
D0 - D7
T2
T4
ACTIVE
T10
T6
T11
DATA OUT
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APPLICATION CIRCUIT
Asynchronous
W83C42
et4U.com
RESETB
SA2
IORB
IOWB
D0 - D7
2 X1
3 X2
4
1
39
9
6
5
8
10
RESET
T0
T1
A2
CS
VDD
RD
WR
12
13
14
15
16
17
18
19
D0
D1
D2
D3
D4
D5
D6
D7
7 VSS
VDD 25
P10
P11
P12
P13
P14
P15
P16
P17
27
28
29
30
31
32
33
34
P20
P21
P22
P23
P24/OB
P25/BF
P26/KCLK
P27/KDAT
21
22
23
24
35
36
37
38
RCB
GATE A20
KEYBOARD CLOCK
NC 11 KEYBOARD DATA
RAM SELECT JUMPER
MANUFACTURING MODE JUMPER
DISPLAY TYPE SWITCH
KEYBOARD INHIBIT SWITCH
KEYBOARD INTERRUPT
VD
D
U?A
U?A
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21
2 VCC KEYBOARD CLOCK
74ALS04
7407
U?B
3 4 KEYBOARD DATA
7407
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- 12 -
12 Page | ||
Seiten | Gesamt 15 Seiten | |
PDF Download | [ W83C42 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
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