EM83055H Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM83055H Datasheet PDF : 22 Pages
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EM83055H
KEYBOARD ENCODER
Keyboards ID ( Hex 83AB )
The 2 byte ID is issued to respond to READ ID command. The low byte is sent first, followed by the high byte.
Keyboard buffer Overrun ( Hex 00 or FF )
If keyboard buffer overflows, the overrun code will replace the last byte in the buffer. If the keyboard is using
scan code set 1 , the code is hex FF. For sets 2 and 3, the code is hex 00.
Resend ( Hex FE )
When the keyboard receives an invalid input or any input with incorrect parity, the RESEND command is sent.
Keyboard Scan Code Table
The keyboard contains 3 scan code sets. The system defaults to scan code set 2, but can be switched to set 1 or
set 3 . The following tables show the key numbers and three scan code sets in hexadecimal values. All the keys
are typematics except for the pause key. When a key is pressed down, the make scan code is sent to the
system. When the key is released, its break code is sent. If two or more keys are held down, only the last key
pressed repeats at the typematic rate. Typematic operation stops when the last pressed key is released, even if
other keys are being released or some other keys are still held down.
The following table shows three scan code sets used in the keyboard.
scan code set 1
Key
`(~)
1
2
3
4
5
6
7
8
9
0
-(-)
=(+)
BACK SPACE
TAB
Q
W
E
R
T
Y
Make code
29
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
Break code
A9
82
83
84
85
86
87
88
89
8A
8B
8C
8D
8E
8F
90
91
92
93
94
95
Key
X
C
V
B
N
M
,(<)
.(>)
/(?)
SHIFT_R
CTRL_L
ALT_L
SPACE
ALT_R
CTRL_R
NUM
(7)
(4)
(1)
(8)
(5)
Make code
2D
2E
2F
30
31
32
33
34
35
36
1D
38
39
E0 38
E0 1D
45
47
4B
4F
48
4C
Break code
AD
AE
AF
B0
B1
B2
B3
B4
B5
B6
9D
B8
B9
E0 B8
E0 9D
C5
C7
CB
CF
C8
CC
* This specification are subject to be changed without notice.
9.25.2001 7
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