EM83055H Datasheet, PDF (1/22 Pages) ELAN Microelectronics Corp – KEYBOARD ENCODER

EM83055H
KEYBOARD ENCODER
GENERAL DESCRIPTION
The EM83055H microcontroller is dedicated to a keyboard encoder ,specially designed for IBM PC AT and
all compatible machines. The EM83055H controll all scan codes, three LEDs status, scan timing and communications
between the keyboard and PC. It is easy to implement a high performance, low cost keyboard with the minimal
external components.
FEATURES
• Low cost - eliminate need external components.
• Phantom key detects.
• RC oscillator ( 1.8432MHz ).
• Support scan code set 1 ,2 and 3.
• Support PC AT and PS/2 keyboard .
• Low power CMOS device technology.
• Internal pull-up resistor.
• Tri-state outputs for easy board application.
• Built-in 4K ROM.
• Support WINDOWS^TM 95, 98, 2000, ME keys.
• 104/107 keys with multi-media or other special application keyboard encoder.
• WINDOWS is registered trademarks of Microsoft corperation.
APPLICATION
• IBM PC AT or compatible machine keyboard.
• IBM PS/2 model 30,50,60,80 or compatible machine keyboard.
• Japanese keyboard.
• Korean keyboard.
• Brazilian keyboard.
• European keyboard.
PIN ASSIGNMENTS
P91 6
P92 7
P93 8
P94 9
P95 10
P50 11
P51 12
P52 13
P53 14
P54 15
EM83055H
36 NUM
35 SCROLL
34 P67
33 P66
32 P65
31 P64
30 P63
29 P62
28 P61
27 P60
* This specification are subject to be changed without notice.
9.25.2001 1