KEYBOARD ENCODER
Description
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 WINDOWSTM 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
P90 CLK DATA OSCO GND R_OSCI VDD CAPS 39 38 37
5 4 3 2 1
P91 P92 P93 P94 P95 P50 P51 P52 P53 P54
6 7 8 9 10 11 12 13 14 15
EM83055H
36 35 34 33 32 31 30 29 28 27
NUM SCROLL P67 P66 P65 P64 P63 P62 P61 P60
* This specification are subject to be changed without notice.
P55 P56 P57 P80 P81 P82 P83 P84 P85 P86 P87
16 17 18 19 20 21 22 23 24 25 26
9.
25.
2001
1
EM83055H
KEYBOARD ENCODER
PIN DESCRIPTIONS
Symbol P50 P51 P52 P53 P54 P55 P56 P57 P80 P81 P82 P83 P84 P85 P86 P87 P90 P91 VSS SCROLL NUM CAPS P60 P61 P62 P63 P64 P65 P66 P67 CLK DATA VDD OSCO R_OSCI I/O O O O O O O O O O O O O O O O O O O I O O O I I I I I I I I I/O I/O I O I Function Column 3 Low output scan line, 3-state Column 4 Low output scan line, 3-state Column 5 Low output scan line, 3-state Column 6 Low output scan line, 3-state Column 7 Low output scan line, 3-state Column 14 Low output scan line, 3-state ...
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