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PDF W83C42 Data sheet ( Hoja de datos )
| Número de pieza | W83C42 | |
| Descripción | KEYBOARD CONTROLLER | |
| Fabricantes | Winbond | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de W83C42 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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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
1 page  
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W83C42
et4U.com
AC TIMING
NO. DESCRIPTION
T1 Address Setup Time from WR
T2 Address Setup Time from RD
T3 WR Strobe Width
T4 RD Strobe Width
T5 Address Hold Time from WR
T6 Address Hold Time from RD
T7 Data Setup Time
T8 Data Hold Time
T9 Gate Delay Time from WR
T10 RD to Drive Data Delay
T11 RD to Floating Data Delay
T12 Data Valid After Clock Falling (SEND)
T13 K/B Clock Period
T14 K/B Clock Pulse Width
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T15 Data Valid Before Clock Falling (RECEIVE)
T16 K/B ACK After Finish Receiving
T17 RC Fast Reset Pulse Delay (8 MHz)
T18 RC Pulse Width (8 MHz)
T19 Transmit Timeout
T20 Data Valid Hold Time
T21 XIN/XOUT Period ( 6-12 MHz )
MIN.
0
0
20
20
0
0
50
0
10
0
20
10
4
20
2
6
0
83
MAX.
20
20
4
3
2
167
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
µS
µS
µS
µS
µS
µS
µS
mS
µS
nS
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Publication Release Date: July 1994
- 5 - Revision A3
5 Page 
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COMMANDS (I/O ADDRESS HEX 64)
COMMAND
20
60
FUNCTION
Read Command Byte of Keyboard Controller
Write Command Byte of Keyboard Controller
BIT BIT DEFINITIONS
7 Reserved
6 IBM PC Compatible Mode
5 IBM PC Mode
4 Disable Keyboard
3 Inhibit Override
2 System Flag
1 Reserved
0 Enable Output Buffer Full Interrupt
AA Self-test
BIT BIT DEFINITIODNatSaSheet4U.com
00 No Error Detected
01 K/B Clock Line is Stuck Low
02 K/B Clock Line is Stuck High
03 K/B Data Line is Stuck Low
04 K/B Data Line is Stuck High
AB
AD
AE
C0
D0
D1
E0
F0-FF
Interface Test
Disable Keyboard Feature
Enable Keyboard Interface
Read Input Port
Read Output Port
Write Output Port
Read Test Inputs
Pulse Output Port
W83C42
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- 11 -
Publication Release Date: July 1994
Revision A3
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet W83C42.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| W83C42 | KEYBOARD CONTROLLER | Winbond |
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